LX-810/850 TECHNICAL MANUAL EPSON
NOTICE “ All rights reserved. Reprc~duction of any part of this manual in any from whatsoever without SEIKO EPSON’s express written permission is forbidden. ● The contents of this manual are subject to change without notice. - All efforts have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them.
REV.-A PRECAUTIONS Precautionary notations throughout the text are categorized relative to 1) personal injury, and 2) damage to equipment: DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by a DANGER headings. WARNING Signals a precaution which, if ignored, could result in damage to equipment.
REV.-A PREFACE This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the LX-8 10/850. The instructions and procedures included herein are intended for the experienced repair technician, and attention should be given to the precautions on the preceding page. The chapters are organized as follows: Chapter 1 - Provides a general product overview, lists specifications, and illustrates the main components of the printer.
REVISION TABLE REVISION I A IMar DATE ISSUED 27, CHANGE DOCUMENT I 1989 1st issue I I E fy, -...,,.; ....
REV.-A TABLE OF CONTENTS CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6.
REV.-A CHAPTER 1 GENERAL DESCRIPTION 1.1 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ..... .1-1 .... 1.2 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .1-3 .. . 1.2.1 Hardware Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REV.-A Figure 1-9. Lever Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21 . Figure 1-10. LX-810/850 Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22 Figure 1-11. TAMA Main Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23 .... Figure 1-12. TAPNL-VV Control Panel . . . . . . . . . . .
REV.-A 1.1 FEATURES The LX-8 10/850 is a small, light-weight, low-cost, advanced paper handling printer comparable to the LX-800. Its main features are: 1. Advanced paper handling: Auto backout and cut sheet loading 2. Expanded ESC/P-code printing, implemented as a standard feature 3. Printing speeds: 200 cps (high speed draft) 1 5 0 CpS (dri~ft 10 cpi) 1 8 0 CpS (dri~ft 12 cpi) 4. Optional 8100 series interface 5. Clear, easy-to-read printing with a standard EPSON font 6.
REV.-A Figure 1-1. Exterior View of the LX-81 0/850 ,.
REV.-A 1.2 S P E C I F I C A T I O N S This section describes LX-8 10/850 prinlter specifications. 1.2.1 Hardware Specifications Printing Method Serial, impact, dot matrix Pin Configuration 9 wires (diameter 0.29mm) #1 #2 #3 () () ( ) #4 < > #5 < > #6 t 0.29mm ! t 0.35mm (1 /72”) f ( ) #7 #8 #9 Figure 1-2.
REV.-A a. Push Tractor Feed 1. Use the pull-out unit. 2. Do not perform reverse feeding greater than 1/6 inch. 3. After paper end detection, accuracy of paper feed cannot be assured and reverse feeding cannot be performed. b. Push Pull Feed 1. Remove the pull-out unit and attach the pull tractor unit. 2. Do not loosen the paper between the platen and pull tractor unit. 3. Adjust precisely the horizontal position of the pull and push tractor. 4. Do not perform reverse feeding greater than 1/6 inch. 5.
REV.-A Table 1-6. Envelope Specifications 92 Size No.6 (166 Imm x Quality Bond paper, Plain paper, Air mail Thickness 0.16 mm to 0.52 mm), No. 10 (240 mm x 104 mm) mm (0.0063 in. to 0.0197 in.) Difference of thickness within printing area must be less than 0.25 rnm (0.0098 in.). Weight NOTES: “ . * 12 lb. to 24 lb. (45 g/m2 to 91 g/m2) Envelope printing is only available at normal temperature. Keep the long side of the envelope horizontal at setting. Set the left of a No.
REV.-A p) . .. Printing Area The figures below show the printing area for cut sheets. 4= 182-257 mm(7. 2-10.1 “ ) * *1 ) Printable *1 ) area 8.5rnrY 0.33 “ or mt “e —\ — i P r r ABC XYZ - 7 I n ,7 ““ 3../ t a b 364mm max. I 14.3 “ max. ~ a r e a — ● — L - XYZ - l ABC — 1 ) At least 3.0 mm (O. 12 in.) when the paper width is less than 229 mm (9 in.); at least 24 mm (0.9 in.) when the paper width is 257 mm ( 10.1 in.) ● Printing is possible approx.
REV.-A 4.0 “ -10.0 “ ,101 mm-254mm I I *1) 1A Printable o 0 0 0 area 0 0 0 0 + 9mm,0.35 “ or more + 9mm,0.35 “ or mqre t Printable area ● 1) 13 0 Printable area 1 o 0 4ABC 0 0 -0- - - - - - - - - - - - - - - - - - - - - - - - - - - 0 0 0 0 ABC 0 0 0 0 0 0 0 0 I *2) t 0 0 0 0 0 )(YZ 0 0 0 0 - - - - - - - - - - - - - - - 00 0 0 0 XYZ 0 0 i 0 0 0 0 0 0 4 mm or greater for paper widths of 101 - 242 mm (4 - 9.5. in.) 26 mm or greater for paper widths of 254 mm (10 in.
REV.-A 2‘1 6mm(8.5 “)* 3mm(0. 12 “ ) I 3rnm min. ‘1 I 3 m m 2 0 3 . 2 m m m i n . I (printable area) — I 50m m i n T AEIC XYZ 1 60m — Figure 1-3. Roll Paper Printing Area Ink Ribbon Type: 8750 Ribbon Cartridge Color: Black Reliability: 3 million characters at 14 dots/character Reliability Mean Cycles Between 3 million lines (excluding printhead) Failure (MCBF): Mean Time Between 4000 POH (2!5% duty) Failure (MTBF): , ,,: f.. ”,.
REV.-A Electrical Specifications Power Conditions 120 VAC & 10% (120V version) Frequency Range 49.5 to 60.!5 Hz Power Consumption 28W (Draft self-test) insulation Resistance 10 Mgohms Dielectric (At 50 or 60 Hz, between the AC line and chassis) 2 2 0 / 2 4 0 VAC + 10% (220/240V v e r s i o n ) Strength min. (Between AC Line and Chassis) 120V Version 1 KV AC (rmslminute) or 1250V AC (rms/second) 220/240V Version 1.
REV.-A 1.2.
REV.-A Printing Columns See Table 1-10 Table 1-10. Column Width (maximum characters/line) Type of Letters Column Width (CPL) Column/inch (cpi) 80 96 137 40 40 48 68 160 80 10 12 17 5 5 6 8.
REV.-A 1.3 INTERFACE OVERVIEW The standard 8-bit parallel interface provided with this printer meets the specifications described below. Data Format 8-bit parallel Synchronization By STROBE pulse Handshaking By BUSY and ACKNLG signal Signal Level TTL-compatible Adaptable Connector 57-30360 (amphanol) or equivalent Data Transmission Timing See Figure 1-6 BUSY ,/[ A { ,/,, . ACKNLG DATA STROBE o.5#s min. min. Figure 1-6.
REV.-A Table 1-11. Connector Pin Assignments and Signal Functions (Cont.) Pin No. Signal Name Return Pin No. DIR Functional Description 14 AUTOFEED-XT — In if “LOW” when the printer is initialized, a line feed is automatically performed by input of “CR” code. (Auto LF) 15 Not used 16 GND 17 Chassis GND Ground for twisted-pair grounding — — Chassis ground level of printer Not used 18 9 to 3 0 GND Grounds for twisted-pair grounding In Pulse (Width: 50#s min.
REV.-A T a b l e 1 - 1 2 s h o w s P r i n t e r S e l e c t / D e s e l e c t (DC l/DC3) controL including relations amon9 ON-LINE, c! . . SELECT-IN input, DC l/DC3 and interface signals. Table 1-12.
1.4 DIP SWITCH AND JUNIPER SETTINGS This section describes DIP switch settings for the LX-8 10/850 printer. 1.4.1 DIP Switch Settings The two DIP switches are located on the side of the printer and function as shown in Tables 1-13 through 1-15. Note that the status of the DIP switc:hes is read only at power on or upon receipt of the I NIT signal. Table 1-13. Settings for D!P Switch 1 (SW1) Description No.
REV.-A 1.5 SELECTYPE F U N C T I O N SelecType allows the user to choose fonts and the printing mode easily. This function provides for selection of Draft, Roman, or Saris Serif fonts and selection of normal printing or condensed printing modes. SelecType is effective only when the printer is ON LINE and not printing. To select Roman or Saris Serif, press the NLQ button. A buzzer sounds when the NLQ button is pressed. When it sounds twice, the Roman font is selected.
REV.-A 1.7 T E A R - O F F FUNCTION The Tear-Off function can be enabled by making the appropriate DIP switch setting, and will operate when the release-lever is set to the tractor position. In such a case, if the input data buffer is empty and the printer is ON-LINIE, the paper will automatically be fed to the tear-off position, and the ON-LINE LED will flash to indicate that the FORM FEED and LINE FEED switches are now available to perform micro-adjustment.
REV.-A 1.8 OPERATING INSTRUCTIONS This section describes the self-test, hexadecimal d u m p functions, error states, printer initialization, and buzzer operation. 1.8.1 Self-Test To begin printing the self-test in the Draft mode, turn the printer ON while pressing the LIN E-FEED button. To begin printing the self-test using the hlLQ mode (Near Letter Quality), press FORM FEED and hold it down, then turn the printer power ON.
REV.-A 1.8.2 Hexadecimal Dump Function The printer enters the HEX-DUMP mode when it is powered on while the LINE-FEED and FORM-FEED buttons are pressed down. In the HEX-DUMP mode, the hexadecimal representation of the input data is printed out, along with corresponding ASCII characters. This function is valuable for checking the data the printer has received from the host. If input data is a control code rather than a character code, a period (.) is printed in the ASCII column. r),<{ ,:! r?,..,.
REV.-A 1.8.3 Buzzer Operation The buzzer sounds under the following conditions: BEL code: The buzzer sounds for 0.1 second when a BEL code is input. Carriage trouble: Beeps 6 times, pausing briefly after 3rd beep. Paper-out: Beeps 20 times, pausing briefly after every 4 beeps. Abnormal voltage: Beeps 5 times, pausing after every beep. Incorrect RAM: (SRAM) Beeps 8 times, pausing briefly after every 2 beeps. (Inside CPU) Beeps indefinitely until power OFF.
REV.-A 1.8.4 Printer Initialization The printer is initialized when: 1 ) AC power is turned on 2) The INIT signal is input Here is a brief summary of the initialization sequence. a) Return the printhead to the Ieftmclst position. b) Set ON LINE mode. c) Clear the print buffer and input buffer. d) Set the line spacing to 1/6 inches. e) Set the page length to 11 or 12 inches according to the DIP switch setting. f) Clear all vertical tab positions. 9) Set the horizontal tab position at 13-column intervals.
REV.-A 1.6 M A I N C O M P O N E N T S The main components of the LX-8 10/850 printer are designed for easy removal and replacement to maintain/repair the printer. The main components are: 1 ) TAMA board: Main control board. The CPU on this board controls all main functions. 2) TAPNL-W control panel: Control panel. 3) TA filter unit: Transformer and filter board. 4) M-3D 10: Printer mechanism. MA board ... t.. TA Filter Unit — Figure 1-10. 1.
REV.-A 1.6.1 TAMA Board The use of the ~PD78 10HG CPU simplifies the main control board circuit design. . PROM (3C) -SRAM (3D) Gate Array E05430 (3B) - CPU LPD78 10HG (2C) Figure 1-II 1. TAMA Main Control Board 1.6.2 TAPNL-W Control Panel The TAPNL-W control panel is the LX-8 10/850 control panel which contains the indicator LEDs and switches. Figure 1-12.
REV.-A 1.6.3 TA Filter Unit The TA filter unit contains a power cord ( 120V Version) or AC inlet (220/240V Version), power switch fuse, filter circuit, and power transformer. (220V Version) (120V Version) (240V Version) Figure 1-13. TA Filter Unit 1.6.4 Printer Mechanism (M-3D1O) The M-3D 10 printer mechanism was developed specifically for the LX-8 10/850 printer.
REV.-A 1.6.5 Housing The LX-8 10/850 housing consists of the upper and lower cases. The upper case houses the control panel. The lower case houses the printer mechanism and the main control board. f:igure 1-15.
REV.-A CHAPTER 2 PRINCIPLES OF OPERATION 2.1 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1.1 Connector Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1.2 Outline of Printer Mechanism Operation . . . . . . . . . . . . . . . . . . . . . . 2-3 2.1.2.1 Sensors . . .
REV.-A 2.2.5.5 Printhead Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41 2.2.5.6 Printhead Software Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-42 2.2.6 Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44 2.2.7 EEPROM Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REV.-A Figure 2-36. Home-PositionSeak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Figure 2-37. Printing Area and Printing Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 Figure 2-38. Friction-Feed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 Figure 2-39. Push Tractor Feed Operation . . . . . . . . . . . . . . . . .
REV.-A 2.1 O V E R V I E W This chapter describes the signals at the connectors linking the primary components of the LX-8 10/850. These components include the printer mechanism and control circuits. The chapter also describes the operation of the printer’s circuitry and /printer mechanism. 2.1.1 Connector Summary The interconnection of the primary components is illustrated in Figure 2-1. Table 2-1 summarizes the functions, sizes, and types of the connectors shown in the figure. Table 2-’1.
REV.-A FiiEElr Model 3D 10 Printer Mechanism Board CR motor Release PF motor PE HOME HEAd — , Control Panel 12Pin 2Pin 1 OPin TAMA Board 2Pin II c E : 5 .5 co c m ,zn “’? ,. TA co ii~ -u n 36 Pin .5 m L z - u m L J Paralel l/F [ Optional l/F ) ‘ (OEM) Filter Unit r–––––––n I I I I Transformer 1 / \ I Filter Board 1 ‘ Power Input I I I 1 I l-l Optional Interface I I I I Board t: L AC”IN I Parallel l/F j Specific l/F I ~-.. ., .,. ,.
REV.-A 2.1.2 Outline of Printer Mechanism Operation The Model 3D 10 is a 9-pin serial dot matrix printer. Because the frame and many of the components are of plastic, the mechanism is lightweight. A block diagram of the printer mechanism is shown in Figure 2-2. & zw f 5: :: ~.:: U m $ (0 A u a --(> NE =0 0+ Ku v< ~~ u 1 ~ 2’:.$.: ~: $ CW = clockwise; CCW= counterclockwise. HP = home position; PE= paper end. Figure 2-2.
REV.-A 2.1.2.1 Sensors The printer mechanism is equipped with the following sensors: Paper-End (PE) Sensor Home-Position (HP) Sensor Friction/Tractor Sensor Paper-End Sensor (PE sensor) Figures 2-3 and 2-4 show the paper-end sensor. This sensor switch is ON when no paper is in place (e.g., when the paper supply has run out). “Paper-out” ~ ON ~ LOW Paper present ~ OFF + HIGH ~Jq~ Platen Paper guide “.. ,- o Paper-End Sensor / ‘“Paper-out” c~ / Paper o / “Paper present” Figure 2-3.
REV.-A Home-Position Sensor (HP sensor) Figures 2-5 and 2-6 show the home-position sensor. The sensor switch is ON when the carriage is at the home position. Home position + ON -+ LOIA/ Other positions + OFF - HIGH This sensor determines the reference pcxsition for the carriage drive, age guide shaft iage Figure 2-5. Home-Position Sensor Mechanism +5V 4
REV.-A :$-2! +. Friction/Tractor Sensor The release sensor senses the position of the release lever in order to detect whether tractor feed or friction feed is in effect. Release Lever Position : Front + F:riction Feed + OFF + HIGH level Release Lever Position : Rear -+ Tractor Feed ~ ON ~ LOW level Rear / Front \ ?“’”\ i, ~. ease Lever w < Friction/Tractor Sensor ~ Figure 2-7’. Release Sensor Mechanism +5V 4 oJKL-= r’ R95 IK Figure :2-8.
REV.-A 2.1.2.2 Motors This printer has the following motors: Carriage motor (step motor) Paper-feed motor (step motor) Carriage Motor The carriage motor is used to move the carriage right and left along the platen. This unit employs a 4-phase, 48-step motor using either 1-2 or 2-2 Phase excitation. An open-loop system is Used for control. Paper-Feed Motor Paper feed is also driven by a 4-phase 48-step motor operating with 2-2 phase excitation.
REV.-A ,. h, 2.1.3 Circuit f. Overview Figure 2-10 shows a block diagram of the TAMA board circuitry. r h‘3”)’ PROM 32KB RAM 8KB/32KB (3C) --7rmm ADDRESS BUS (UPPER BYTEI i PD78 10HG (2 c) XWl DATA/ADDRESS BUS (LOWER BYTE) ~Q= A[)DRESS ADDRESS ,LE DECODER LATCH I I GA E05A30 (36) J EEPROM (1 c) B I CONTROL PANEL CONTROL PANEL LED DRIVE + 24VDC +5VDC t t + 12vDC t, ‘Usir+km+=l CG = character generator; GA = gate array. Figure 2-10.
REV.-A ● E05A30 gate array (3B) The E05A30 functions are as follows 1. Parallel l/F 2. Address decoder 3. Data address multiplexer 4. PF motor control 5. CR motor control 6. Control panel LED drive 7. Printhead drive control ● EEPROM (lC) The EEPROM has a 256-bit memory, and remembers the current paper position. Other control circuits are as follows: ‘ Paper feed motor drive circuit The paper feed motor drive circuit drive:; the paper feed motor. The paper feed motor is a 4 phase-step motor.
REV.-A 2.2 PRINCIPLES OF OPERATION This section describes the operation of each component. 2.2.1 Power Supply Circuit The electrical power required by this mechanism is developed using the TA Filter Unit (which combines a filter and a power transformer) and the TAMA board. The AC input passes first through the filter circuit, where line noise is removed, and is then set to the transformer, where it is stepped down into two separate voltages: AC 26V and AC 12V.
REV.-A 2.2.1.1 TA Filter Unit The filter board and the transformer are integrated into a single unit. This unit also incorporates the power switch and the inlet for the incolming AC cable. The incoming AC power passes first through the over-current protection fuse (F 1 ) and the power switch, and then into the filter circuit comprised of C 1, C2, C3, and L 1.
REV.-A 2.2.1.2 + 12V DC Power Supply Circuit: As Figure 2-13 shows, a half-wave rectifying circuit is used to convert the incoming 12VAC voltage to + 12VDC. The 12V output is used only for the option l/F board (via the CN2 connector on the TAMA board). The TAMA board itself does not utilize this voltage. ,f\c12 e D3 EMO IZW m AC2 ~ T T D + 12V Figure 2-13. + 12V DC Power Supply Circuit g“:, . . ... .
REV.-A 2.2.1.3 +24V DC Power Supply Circuit The incoming AC + 26V is full-wave rectified by diode bridge DB 1, generating a DC voltage of about 36V. This voltage is converted by the switching regulator (uPC494C) to +24V DC. Figure 2-14 illustrates the circuit design. F2 MQ1-3. 15A +4 DB1 RBA406B c 1:%4 R17 6.1 K cl 6 6800U 12 cl 50V ~ :Vcc 26VAC INPUT ~ e +24vDC F .--1 ZD1 , HZS , 20-2 — C4 7 k ;6 !200# 15V GND oc RT C T o 4?; K 3 O.o?p film I + GP *R2 0.1 2W Figure 2-14.
REV.-A ., . +..,, ,. f. . Switching Regulator Circuit When the voltage is supplied from the rectifying circuit, a 27 KHz switching pulse based on the external C3-R 10 circuit is created. At the same time, the standard voltage regulator outputs 5V, which is supplied, as a comparative voltage, to the negative terminal of error amplifier EA 1.
REV.-A Feedback Circuit A voltage switching circuit is formed by RI 1, R 12, and R16, and the potential of the +24V output voltage is fed back to PPC494C. The line between R 12 and R 16 feeds back to the positive terminal of EA 1 in the PPC494C, where it is compared against the standard + 5V voltage. The electric potential of the feedback line becomes the same as the standard potential at 24.3V, as shown by the equation below. If the voltage exceeds 24.
REV.-A Over-Current Protection Circuit Error amplifier EA2, in the KPC494, detects over-current caused either by abnormal operation, or by abnormality in the 24V line at the time of power up. Current-detecting resistor R2 is set at the EA2’s positive terminal (pin 16), and the current, converted to a voltage value, is monitored. The negative terminal of the EA2 is connected to the dividing circuit for the standard voltage (+ 5V) and the 24V output.
REV.-A Switching Pulse Output The output of the error amplifier in KPC494C is determined by the difference between the output pulse of the internal oscillating circuit and the feedback voltage from the + 24V output. The feedback voltage changes according to printer operation (i.e., printer load). The output of the error amplifier acts to minimize this change, however, by responding as indicated in Figure 2-19.
REV.-A Chopping Circuit A chopper circuit consisting of diode D 1 and coil L1 is utilized at the output stage. If Q1 in ON, the coil acts as a resistor, and suppresses vic)lent current surges. When Q 1 goes OFF, the stored energy in the coil generates a reverse starting current, and current flows via D 1. Thus, the circuit works as a current stabilizer. 0.4Y3VV ~~ K NCNC 4 . - 1 T 3:30 1o11 (3A) UPC494C LP40 l~!126SD D 1:’33 R14 9 3 . 3 K El 2 IN+ ;N D. T. CR. O F.
REV.-A 2.2.1.4 +5V DC Power Supply Circuit The +5VDC is generated by the switching and step-down action that Q6 applies to the 24VDC supplied from the 24V power circuit. Immediately following power up, VI of SR 1 will be LOW, so that Q6 will be ON. Therefore, + 24V will be supplie, via Q6, to the chopper circuit (D2, L2) and the smoothing circuit (C7). When the charge in C7 reaches 5V, however, SR 1 brings VI into a high-impedance condition, and Q6 goes OFF.
REV.-A 2.2.2 Reset Circuit This circuit generates the signal that initializes the printer, and is made by monitoring the + 5 and + 24V voltages when the power is switched ON and OFF. The reset signal line is connect to the CF’U and gate array 3B. Figure 2-22 shows the reset circuit. Q5 A1015 MA 165 +5V+ R57 10K RESET R36 3.9K +- 24v~ MA4036-M Figure 2-22. Reset Circuit 2.2.2.1 Power-on Reset As Figure 2-23 indicates, a rising -+ 24V pulse occurs first, after which a + 5V rising pulse o c c u r s .
REV.-A 2.2.2.2 Operation at Reset The reset signal causes the following operations to occur. 1. The printhead carriage moves to the left-side home position. 2. The printer enters the ON-LINE mode. 3. The print buffer and input buffer are cleared. 4. The line spacing is set to 1/6 inch, and the page length is set, depending on the DIP switch setting, to either 11 or 12 inches. 5. Vertical tabs are cleared. 6. Horizontal tabs are set for every 8 cc)lumns (columns 8,1 6,24...) 7.
REV.-A ,:;> ,., . f 2.2.3 Carriage Operation This section describes the carriage operation. 2.2.3.1 Carriage Mechanism The carriage mechanism includes the printhead, the carriage, the timing belt, the carriage motor, and the platen. Figure 2-24 shows the carriage mechanism. The timing belt is connected to the bottclm of the carriage. The belt is driven by the carriage motor and moved via the belt-driven pulley.
REV.-A 2.2.3.3 Carriage Drive Circuit Block Diagram Figure 2-25 shows a block diagram of the carriage motor drive circuit. In this circuit, the phase switching for the carriage motor is directly executed not by the CPU, but by the gate array (3 B), which acts on CPU phase da the . SLA702( vl drives the carriage motor with a stabilized current. n GA CPU SLA 7020M E05A30 (3B) t PD78 10HG ( 1A) (2C) Data Phase Data~ - M ‘o Figure 2-25.
REV.-A 2.2.3.4 Carriage Motor Drive Circuit This unit utilizes an SLA7020M IC for the step motor drive. This IC causes the motor to be driven at the specified current. The IC utilizes a MOSFET power element, so that heat generation is low, and there is no need to use a radiator board. The current value is determined by the value of the external voltage input. Within the IC, the AB (Ax) phase and the CD (BE) phase are completely differentiated, and create identical circuits.
+24V Phase X I ● F24V ( r ——— ———.—— 5 6 8T I I I I I 1) I I — $ !1 ——.—.— 2 —— +5V +5V R30 1.0 R59 47K D5 4 3 C15 470p P A t Gp NOTE: Phase CD is equivalent to the above. Figure 2-27.
REV.-A SLA7020M Phase Signal Input Circuit Although most step-motor control IC’S input 4-phase data directly, the SLA7020M requires a special type of phase data. In the case of 2-2 phase excitation: Figure 2-28 shows the excitation signal input circuit. The A-phase-side excitation signal input is via a single line. The output is divided among non-inverted A-phase output and A-phase output passed through an inverter. Therefore, the A-phase output side will be ON when the excitation input signal is HIGH.
REV.-A In the case of 1-2 phase excitation: Figure 2-30 shows the excitation signal input circuit. When the Td terminal is LOW, the SLA702M can cut off the output current. By using this function, the unaltered 2-phase excitation signal can cause the 1-2 phase excitation to be on 3/8ths of the time, which is a suitable value. Figure 2-31 shows the timing chart. ““’’’-r’”’ Figure 2-30. Phase Data Input Circuit (l-2 Phase) INA input TdA I l l I l l I l l I l l ;; I I , .
REV.-A Reference Voltage Generation Circuit Figure 2-32 shows the reference voltage generation circuit and Table 2-3 shows the reference voltage. The reference voltage generation circuit is shown in Figure 2-32, the reference voltages are shown in Table 2-3. The SLA7020M drives the stepping motor based on current proportional to the reference voltages set here.
REV.-A Constant Current Drive Circuit The constant current drive circuit is shown in Figure 2-33 (for A-phase only), and the waveforms for each part are shown in Figure 2-34. In Figure 2-33, the reference voltage is indicated by Vref; this voltage determines the peak current through resistance R30. Resistance R59 and capacitance C 15 determine the OFF time of the chopper. vcc= +24V t II 1 IOFF 1 ! b c) +-l + I . /1 , I @ RSA COMP1 1 C15 470p J Gp “ i ION RS= R30 lsll w D5 Gp Gp Figure 2-33.
REV.-A 0{ WWF I VRS I -.-.-- - - - - - - - - - - - - - - ?------ - - - - - - - 1 Vb VT Q { 0VG 0{ 0{ o~ --------- : .-.-J---------.--- , ------ : ----- . : - . ---- s ----------------------#, : 1 ---- ;----------------- 0 8 0 , 1 Zvcc --- ~; — ‘4 VG VF , 1 ; 1P . --- , L ----------, . , km I o , t IWF t I * i t 1 o ------ #- - - - - - - ---------------- I t o{ , , , I t b ------ 1 F I 0 I t Icc o , - - - - - - - - - - - - - - - - - - - - - - - - .
REV.-A (7) IOFF flow then causes current flow in R30 to change direction. COMP1 feedback voltage VRS (V-) thereby drops below VREF, and COMP1 again inverts. (8) COMP 1 output stages are formed by an open collector circuit. As a result of the inversion in step (7), COMP 1 output goes HIGH, so that TD voltage VTD gradually rises, in line with the time constant determined by resistance R59 and capacitance C 15.
REV.-A 2.2.3.5 Carriage Motor Software Control This section describes the carriage motor software control. Excitation System The excitation system is determined by the firmware and is executed in accordance with the carriage speed, as shown in Table 2-4. The motor drive sequence for each excitation system is shown in Tables 2-5 and 2-6. Table 2-4. Phase-Excitation Method Carriage Speed Phase-Excitation Method 1 2 0 0 PPS 2-2 Phase 900 PPS 2-2 Phase 900 PPS 1-2 Phase .,: .,, ., $,’, ‘-,,..
REV.-A Because the carriage is driven by a step motor, the printing direction can be changed at any time, and the carriage can be stopped at any position. Carriage motor control is effected by an open-loop system which switches the phases in accordance with the set speeds.
REV.-A Printing Area The printing area is defined as starting 26 phase switching times following the home position. 1 II I --JvLODJm-J_ i...- Acceleration Area 4- Printing Area Figure 2-37. Printing Area and Printing Timing Abnormal Carriage Operation This unit does not employ a print timing signal (PTS) sensor and cannot detect abnormal carriage operation. There will therefore be no error recognition if, for example, the carriage movement is blocked or otherwise affected by an external force.
REV.-A 2,2.4 Paper Feed This section describes the paper-feed operation. 2.2.4.1 Paper Feed Mechanism Operation Friction feeding is used for cut sheets, and push tractor feeding is used for fanfold paper. Friction-Feed Operation The paper is held against the platen by paper-feed rollers. The paper-feed motor rotates the platen gear, via the paper-feed reduction gear, in the direction shown in Figure 2-38.
REV.-A K<::;* ‘3:, ‘ Push Tractor Feed Operation When the push tractor unit is used, the paper is set such that its holes mesh with the tractor pins along the tractor belt. The paper feed motor is driven and, via the pinion on the motor shaft, rotates the gears in the direction shown in Figure 2-39, rotating the tractor belts. This causes the paper advances in the direction indicated by the arrow.
REV.-A 2.2.4.3 Paper-Feed Motor Drive Circuit The paper-feed motor drive circuit is shown in Figure 2-40. The paper-feed motor is a step motor which can utilize 2-2 phase excitation. When the paper-feed signal PC2 is set to HIGH, Q20 and Q 16 are turned on, and +24 V is supplied to the motor. When the paper-feed motor is not driven, + 5 V is supplied, via resistor R42 and diode D6, to hold the motor. ‘n +24V CPU flPD78 10HG (2C) PC2 R36 R44 5.6K +5V & R42 EMD! W 39 l/2W 10 R45 5.
REV.-A 2.2.4.4 Paper-Feed Motor Software Control The paper feed motor is a 48-pole step motor and is open-loop controlled. When 2-2 phase excitation is used to drive the motor, each step feeds the paper a distance of 1/2 16th inch. Table 2-7 shows the paper-feed motor excitation system. Table 2-7. Excitation Sequence (Clockwise: Paper Feeds Forward) Step No.
REV.-A 2.2.5 Printhead This section describes the printhead operation. 2.2.5.1 Printhead Printing Operation The dot-wire operation during printing is as follows. When the head-driving coil for a dot wire is energized, the actuating plate, which is engaged to one end of the dot wire, is attracted to the iron core, and drives the dot wire toward the platen. The dot wire forcefully pushes both ribbon and paper against the platen, causing a dot to be printed.
REV.-A 2.2.5.3 Printhead Drive Circuit Block Diagram Gate array E05A30 is used as an 8-bit + l-bit data latch. The CPU determines the pulse width for the head-wire drive pulses from gate array E05A30 by monitoring the printhead drive power (+24 V line). GA E05A30 (3B) CPU ~ PD78 10HG (2C) Pri nthead D rive C i rc u it Pri ntherd --N DATA 3 --l/ ...... ‘i_ FIRE ● I Figure 2-43. Printhead Drive Circuit Block Diagram 2.2.5.
REV.-A 2.2.5.5 Printhead Drive Circuit The drive pulse width is adjusted using CPU port PC6. +24V J 8 11 GA HD1 6 3 E05A30 (3 B) HD2 6 2 R21,,, I K D1647 Q7 R20,,, IK 5 D1647 Q9 9 * D1647 Q8 HD3 61 R22,kh 1 K HD5 5 9 HD6 58 HD7 HD8 HD9 D1647 Q13 R26&,, IK 3 R28,,, 1 K 1 D1647 QI 1 R25,,, 1 K R27,,, 1 K 10 D1647 Q12 R24,,, IK ‘ 2 3 D1647 Q1O HD4 6 0 R23A,, 1 K 12 2 4 +’GP I Figure 2-44. Printhead Drive Circuit I J [ I 1 I 1J 20V 0.5 m s Figure 2-45.
REV.-A #r?, .* -.. 2.2.5.6 Printhead Software Control During operation at 900 PPS, one print cycle is performed at each phase switching step, so as to meet the specifications of the printhead (solenoid drive frequency: 900 Hz). The drive pulse width is adjusted by using an A/D converter (Figure 2-47) to detect the drive voltage, and is kept within the area outlined by the oblique lines in Figure 2-47. Specif icat ion of Pr inthead iI II Ii Head Prive Pulse $:q:&J1-n—rL 900PP I I I I I .
45C (425) 05 400 Drive Pulse Width 350 (ils) 5) I I 1 1 1 1 I t ;) t 1 300 1 1 1 22.0 (21 .6) 1 1 I 1 I t 1 1 1 1 1 I 1 o I 23.0 24.0 1 1 1 1 1 25.0 26.0 (26.4) Drive Voltage (VDC) Figure 2-48.
REV.-A 2.2.6 Host Interface The host interface circuit is shown in Figure 2-49. STROBE pulses from the host computer pass through the low-pass filter, consisting of R72 and C 12, and flow into the STROBE terminal. These pulses latch the parallel data and set the BUSY signal HIGH, so that subsequent data transfer is inhibited. At this time, the CPU, by reading address OCO02H, can detect whether the data from the computer are latched in the gate array.
REV.-A 2.2.7 EEPROM Circuit The EEPROM stores in its memory the current feed position of continuously fed paper, as well as the current panel settings. This memory is retained even after power is shut off. EEPROM can memorize the current position of continuously fed paper, so that this information can be maintained even if power goes off. Figure 2-50 shows the EEPROM circuit. Note that this is external to the CPU’s memory space. EEPROM is selected when CPU port PC5 goes HIGH.
REV.-A 2.2.8 Ribbon-feed Mechanism The ribbon-feed mechanism consists of the ribbon cartridge and the ribbon-feed section. The ribbon-driving gear is always driven counterclockwise (regardless of the timing belt direction) via the gear trains shown in Table 2-8. Table 2-8.
REV.-A CHAPTER 3 OPTIONAL EQUIPMENT 3.1 INTERFACE OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .3-1 ... 3.1.1 Model 8143 Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 . 3.2 CUT SHEET FEEDER C80612* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 .. 3.2.
REV.-A Figure 3-14. Removal of Sprocket Mounting Plate L . . . . . . . . . . . . . . . . . . . . . . . . . 3-17 Figure 3-15. Removal of Sprocket Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18 Figure 3-16. Direction of Paper Guide Roller Removal . . . . . . . . . . . . . . . . . . . . . . 3-18 $“ h “$. Figure 3-17. Direction for Insertion of Sprocket Wheels ................. 3-19 LIST OF TABLES Table 3-1. Optional Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . .
REV.-A 3.1 INTERFACE OPTIONS The LX-8 10/850 is able to utilize the Model 8100 series optional interfaces. The main interfaces are listed in Table 3-1. Table 3-1. Optional Interfaces ~ I Cat. No. Description I RS-232C Current Loop Buffer Size Flag Control X-O N\OFF Control Max.
c?,:. REV.-A Jumper Settings Table 3-2. Jumper Settings Function J1 ON: “TTY TXD” is brought to -t- 12V through 470 ohm register. J2 ON: “TTY TXD RET” is connected to signal ground. J3 ON: “TTY RXD” is brought to + 12V through 470 ohm register. J4 ON: ‘“TTY RXD RET” is connected to signal ground. J5 ON: “DTR and DCD” are brought to 12V through 4.7 Kohm register.
REV.-A Table 3-4. Bit Rate Settings Bit Rata (bps) SW1-7 (JB4) Swl-1 (JB3) SW1-4 (JB2) SW1-3 (JB1 ) Bit Rata (bps) SW1-7 (JB4) Swl-1 (JB3) SW1-4 (JB2) SW1-3 (JB1 ) 75 ON ON ON ON 1800 OFF ON ON ON 110 ON ON ON OFF 2400 OFF ON ON OFF 134.
REV.-A 3.2 CUT SHEET FEEDER C80612* The LX-8 10/850 printer can use C806 12* cut sheet feeder. This cut sheet feeder has the following features: 1. Cut sheets may be handled in the same way as fanfold paper. 2. Sheets may be manually inserted. 3. The feeder is easily mounted and dismounted from the printer. 4. The feeder requires no electrical connection to the printer. 5. The feeder is extremely reliable. 6. A high level of performance can be achieved. Figure 3-1.
REV.-A 3.2.1 Cut Sheet Feeder C80612* Specifications This section details the operating specifications for Cut Sheet Feeder C806 12*. 3.2.1.1 General Specifications For paper weight of: Hopper Capacity: 64 g/m2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .185 sheets maximum 90 g/m2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REV.-A ,,p, ‘$-.... 3.2.1.3 Printing Area See Figure 3-2. 3mrn(0.i 2’”) min. 8.5mm(0..33”) min. I A Printable area XYZ ABC { /, / ),/ / XYZ ABC 1 3mm(0.i 2“) min. Printable area 13.5mm(0.53”) approx. Figure 3-2. Printing Area NOTES: The printable length is approximately 22mm (0.87 inches) less than the actual page length. Paper feed accuracy can not be assured within 22mm (0.87 inches) from either top or bottom edge.
REV.-A 3.2.1.4 Dimensions and Weight 444 mm (1 7.5 inches) (Width) X 434 mm (1 7.1 inches) (Depth) X 416 m m Dimensions: (1 6.4 inches) (Height) (including paper feed knob) NOTE: Dimensions were measured with the cut sheet feeder mounted on the printer. / Figure 3-3. Dimensions Weight Approx. 1.
REV.-A ‘+ C .. 3.2.2 Cut Sheet Feeder Operating Principles The cut sheet feeder is driven by firmware incorporated in the printer. The feeder need not be electronically connected to the printer. Cut sheet feeder mode can be selected either by DIP switch or by command. Selection by DIP switch The cut sheet mode is selected by the DIP switch setting. Table 3-5. DIP Switch Selection DIP Switch Function ON OFF 2-2 Cut Sheet Feeder M o d e Valid Invalid * $.
REV.-A 3.2.2.1 Mechanism Operation Paper is loaded between the paper holder and the paper loading rollers. When the paper feed motor rotates in reverse, the gears, via the pinion on the motor’s shaft, rotate in the direction of the white arrows (see Figure 3-4), and friction causes the paper to advance to the paper guide.
REV.-A f..: .*.-. 3.2.3 Cut Sheet Feeder Disassembly and Reassembly This section describes the procedure for removing the hopper unit of the C806 12’ cut sheet feeder. Unless otherwise specified, reassembly is performed by reversing the sequence. The diagrams in Figure A-2 1, which are provided as reference for disassembly and reassembly, show an exploded view of the parts configuration. The required tools are listed in Table 3-6. Table 3-6. Tools for Assembly or Disassembly Availability Part No.
REV.-A 1. Remove side covers L and R. Side cover (R) Side cover (L) .,. + Figure 3-5. Side Cover Removal 2. Remove the E-ring (6) on the paper loading roller shaft, and then remove the shaft. E-ring (6) , \ Paper Loading Shaft Figure 3-6.
REV.-A $!:?., ..... . 3. Remove the 2 E-rings (6) on the paper support shaft. E-ring (6) . Figure 3-7. E-Ring Removal 4. Remove the shaft holder fastening the paper support shaft to frame L. = Shaft Holder Frame Figure 3-8.
REV.-A 5. Remove the E-ring (6) on the paper support shaft (See Figure 3-9) 6. Lift, together, the hopper unit and the paper support shaft. Paper Loading Roller Shaft Holder e @l E-ring (6) support ection I Figure 3-9.
REV.-A .,..,, :, f“ 3.2.4 Cut Sheet Feeder Preventive Maintenance The cut sheet feeder C806 12* is well designed and requires only a minimum of preventive maintenance, as follows: a) General cleaning of the device. b) Checking the mechanical functions. 3.2.4.1 Cleaning a) Brush off all paper dust. b) Check the surfaces of the paper loading and paper ejecting rollers. NOTE: If one of the paper loading rollers is damaged, or if wear is uneven, both rollers must be replaced. WARNING *. ,.
REV.-A Figure 3-11.
REV.-A 3.3 PULL TRACTOR C80006* g!: .. The optional pull tractor C80006* provides optimu,m continuous paper handling. The pull tractor is especially useful with continuous multipart forms and labels. 3.3.1 Pull Tractor Operation When using the push-pull feed method, set the paper holes onto the pins along the sprocket wheel, and also onto the tractor pins along the tractor belt.
REV.-A 3.3.2 Pull Tractor Disassembly and Reassembly 1. Remove the catch fastening the sprocket reduction gear to spocket mounting plate R. Then remove the Reduction gear. 2. From the sprocket shaft, remove the E-ring (6), the sprocket gear, the sprocket gear spring, and the washer. 3. Remove the E-ring (6) on the inside of mounting plate R. ear g (6) Figure 3-13. Removal of Sprocket’s Intermediate Gear and Related Parts 4.
REV.-A 5. Remove the E-ring (6) from the sprocket shaft, then remove sprocket mounting plate R. (@-ring’” Sprocket Mounting Plate R Figure 3-15. Removal of Sprocket Mounting Plate. 6. From the sprocket shaft and the sprocket guide shaft, pull and remove sprocket set R, the paper guide roller, and sprocket set L. In separating the paper guide roller, pull in the same direction as the side on which the T-shaped notch is located. (When reassembling, insert from the same side.
REV.-A Reassembly 1. Insertion of the paper guide roller onto the sprocket shaft should be in the direction indicated in Figure 3-17. 2. When inserting the sprocket roller into the sprocket shaft, the marked sides of both wheels should face to the left, and the markings should be analogously positioned. Shaft er portion goes on side.) Marks to ‘be Matched Figure 3-17.
REV.-A CHAPTER 4 DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT . 4.1 GENERAL REPAIR INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 . 4.2 DISASSEMBLY AND REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3 4.2.1 Printhead Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 .. .. 4.2.2 Removal of Casing . . . . . . . . . . . .
REV.-A Figure 4-5. . Upper Casing Removal-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 Figure 4-6. .. Upper Casing Removal-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Figure 4-7. Control Panel FFC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Figure 4-8. . Control Panel Removal . . . . .
REV.-A Figure 4-42. Platen Gap Adjustment Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28 LIST OF TABLES ... Table 4-1. Repair Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 .. Table 4-2. Measuring Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 Table 4-3.
REV.-A 4.1 GENERAL REPAIR INFORMATION This chapter describes the procedures for removing, replacing, and adjusting the main components of the LX-8 10/850. CAUTION ● Prior to beginning any of these procedures, be certain that the AC power cord is disconnected. ● To help prevent hands from being cut by the printer mechanism or sharp plate edges, wear gloves when performing these procedures. WARNING .
REV.-A To ensure optimal performance of the printer, be sure, following reassembly and adjustment, to @ ., lubricate, apply adhesive, clean, and maintain, according to the procedures described in Chapter 6. In referring to small parts, this manual utilizes the abbreviations listed in Table 4-3. Table 4-3.
REV.-A 4.2 DISASSEMBLY AND REASSEMBLY This chapter details the disassembly procedures for the LX-8 10/850.As a rule, reassembly is performed by simply reversing the procedures; a number of special notes, however, are provided under the heading “Notes for Reassembly.” When a disassembly or reassembly procedure requires that an adjustment be performed, the adjustment is described under the heading, “Required Adjustment.” Be sure to perform these adjustments as indicated.
REV.-A 3. Unlock the two levers securing the printhead ~~ to the carriage by pulling them down. Then lift and f :-. remove the printhead. Figure 4-2. Printhead Removal 4. Disconnect the head cable from the connector on the printhead. NOTE ● For the European version of the printer, a net is mounted on the printhead. p -. ,. , Figure 4-3.
REV.-A 4.2.2 Removal of Casing This section details the procedure for removing the upper casing and the control panel (TAPNL). 4.2.2.1 Upper Casing Removal 1. Remove the sheet guide unit, printer cover, and paper feed knob. 2. Push in the two notches securing the push tractor to the printer mechanism, and remove the push tractor from the printer mechanism. Figure 4-4. Push Tractor Removal 3.
REV.-A 4. While lifting the upper casing, disconnect the cable of the control panel (TAPNL) from connector ,:: , f? .’ CN3 on the TAMA board. Then remove the upper casing. Figure 4-6. Upper Casing Removal -2 NOTE FOR REASSEMBLY: Before reassembling the upper casing, prepare the FFC (Flat Flexible Cable) that connects the Contol Panel and TAMA Board in such a way that it can be connected to the Panel Cable Shield Plate. Refer Figure 4-7, $-: . . . ,,Control Panel Figure 4-7. Control Panel FFC .,, .
REV.-A 4.2.2.2 Control Panel (TAPNL) Removal 1. Remove the upper casing (as described in the previous Section). 2. Turn the upper casing over, push in the two notches on the casing that are securing the control panel to it, and remove the control panel. anel Figure 4-8.
REV.-A 4.2.3 Removal of Circuit Boards This section describes the procedure for removing the TAMA Board and the TA filter unit. 4.2.3.1 TAMA Board Removal 1. Remove the upper casing (refer to Section 4.2.2. 1). The following connectors on the TAMA board, which are connecting it to external components, should be disconnected: CN4 (red), CN5 (white), CN6 (black),CN7 (white), CN8 FFC (Flexible Flat Cable), and CN9 (white). WARNING Do not pull roughly on the connectors, or you may damage the board.
REV.-A 4.2.3.2 TA Filter Unit Removal 1. Remove the upper casing (refer to Section 4.2.2.1). 2. Disconnect connector CN9 at the TAMA board. This connector connects the TA filter unit. 3. Remove the CB(0) (M3 x 6) screws securing the frame GND wire. 4. Remove the CBB (M3 x 12) screws and CB(0) (M3 x 6) screws securing the filter unit, and then remove the unit. . CB(0) (M3 X 6) cJ19 CBil (M3 X 12) cd(o) TA‘ Filter (M3 X 6) unit Figure 4-10.
REV.-A 4.2.4 Removal of Printer Mechanism This section describes the removal of the platen unit, paper guide shaft, and printer mechanism. The platen unit and paper guide are removed first in order to enable quick and easy removal of the printer mechanism. ;., ’ ., . . Figure 4-11. Printer Mechanism Removal 4.2.4.1 Removal of Platen Unit and Paper Guide 1. Remove the upper casing (refer to Section 4.2. 1.1). 2. Remove the cover of the paper tension unit. @ Opent the Cover @ Pull out cover Figure 4-12.
REV.-A 3. Remove the paper tension unit. Figure 4-13. Paper Tension Unit Removal 4. Remove the GND spring. GND spring Figure 4-14.
REV.-A 5. Turn the shaft holders at the left and right sides of the platen unit as shown in Figure 4-15. Lift and g,}:! ~’-. remove the platen unit. ten \ Shaft Holder a. b. Use a screwdriver to push the shaft holder outward. Turn the shaft holder counterclockwise. Figure 4-15. Platen Unit Removal ~,. ... .:, J. 6. Disconnect the cable from CN6 on the TAMA board. 7. Unlock the two notches of the paper guide by pushing them forward from the rear side of the printer mech anism. Remove the paper guide.
REV.-A 4.2.4.2 Removal of Printer Mechanism 1. Remove the platen unit and paper guide (refer to Section 4.2.4.1, immediately above). 2. Disconnect the cables from the following connectors on the TAMA board: CN4 (red), CN5 (white), CN7 (white), and CN8 (flexible flat cable, or “FFC). Refer to Figure 4-9. 3. With a screwdriver, push and loosen the six tabs securing the printer mechanism to the lower casing. For easiest removal, follow the procedure below.
REV.-A 4.2.5 Disassembly of Printer Mechanism This section details the removal of components from the printer mechanism. Figure A-1 9 shows an exploded diagram of the printer mechanism, offering a view of the various components. Table A-1 7 lists the components by name. COMPONENT NAME LIST. 4.2.5.1 Removal of The Paper-Feed Mechanism 1. Remove the printer mechanism (refer to Section 4.2.4). 2. Remove the three paper-feed rollers from the frame. Paoer-feed rollers Figure 4-18.
REV.-A 3. Loosen the two tabs securing the paper guide plate and spacer to the frame, and lift and remove the plate. Spacer Figure 4-19. Removal of Paper Guide Plate NOTES FOR REASSEMBLY When remounting the paper guide plate and spacer to the frame, refer to Figure 4-20 for the mounting direction. Figure 4-20.
REV.-A 4.2.5.2 Removal of Paper-Feed Motor, Release Lever, and Release /Tractor Sensor 1. Remove the printer mechanism (refer to Section 4.2.4). 2. Disconnect the motor cable from the paper-feed motor. 3. Loosen the two bent tabs on the frame which are securing the paper-feed motor, and remove the paper-feed motor. Frame (R) P a p e r feed M o t o r Bent tabs Figure 4-21. Removal of Paper-Feed Motor 4.
REV.-A 5. From the inside of the frame, push the notch of the release lever outward. Remove the release Iever. Lever Figure 4-23. Removal of The Release Lever 6. Push the two notches securing the release/tractor sensor, and remove the sensor. Frame // Push 4 % ,, ,’ ;L\/ Release/trector Sensor -, ‘ / Push c %* Figure 4-24.
REV.-A 4.2.5.3 Removal of Paper-End Sensor 1. Remove the platen unit and paper guide (refer to Section 4.2.4. 1). 2. Loosen the tab securing the paper guide. Using point A (refer to the Figure below) as a fulcrum, rotate the sensor in the direction indicated by the arrow, and remove it in the direction shown by the a r r o w below. ~<. Notch (Cross-section of Paper Guide) Figure 4-25. Removal of Paper-End Sensor 4.2.5.4 Disassembly of Platen Unit 1. Remove the platen unit (refer to Section 4.2.4.1) 2.
REV.-A 4.2.5.5 Removal of Carriage Unit 1. Remove the printer mechanism (refer to Section 4.2.4). 2. Remove the printhead and disconnect the head cable. 3. Turn the printer mechanism upside-down, and manually move the carriage unit until it is at the cut-out section of the carriage motor frame. The joint of the carriage unit and timing belt should be visible through the cut-out. Figure 4-27. Bottom View of Printer Mechanism 4. Using round-nose pliers, detach the timing belt from the carriage unit.
REV.-A c ..h ,,, 6. Turn the printer mechanism over so that it is again face up. Rotate the lever on the left side of the -1 ... carriage guide shaft counterclockwise, and pull it out through cutout A. Rotate the lever on the right side of the guide shaft clockwise, and remove it in the same way. Frame A o / Carriage Gu!de Shaft Lever (Left) Q ,) 1 \ %. @ ~ P .A: Figure 4-29. Removal of Carriage Guide Shaft tin.’ 7.
REV.-A NOTES FOR REASSEMBLY 1. When reinstalling, position the carriage guide shaft and the head adjust lever as shown in Figure 4-31. Guide Shaft Figure 4-31. Carriage Guide Shaft and Head Adjust Lever 2. The lever for the left side of the guide shaft is gray in color; the lever for the right side is black. Slide each lever onto the appropriate side of the shaft. 3. When connecting the head cable, be sure to pass it correctly through the FFC guide on the frame.
REV.-A 4.2.5.6 Removal of Carriage Motor 1. Perform Steps 1 to 5 of Section 4.2.5.4. 2. Disconnect the motor cable from the carriage motor. Disconnect the lead wire of the home-position sensor from the molded clip at the bottom of the frame. (Refer to Figure 4-32.) 3, With a screwdriver, loosen the four tabs securing the carriage motor frame to the chassis frame. Remove the carriage motor frame. —... . . . . %4*Y . Tabs f. “ Carriage Motor Tabs Connector Figure 4-32.
REV.-A NOTES FOR REASSEMBLY: The following applies to E-ring reattachment: ● When attaching a ring to the left pulley shaft, set it so that its opening faces left. ● When attaching a ring to the right pulley shaft, set it so that its opening faces right. O Use tweezers to check that the attached retaining rings are firmly in place and will not not move.
REV.-A ..,:, p 4.2.5.7 Removal of Home-Position Sensor 1. Remove the carriage motor frame. Follow Steps 1 to 3 of Section 4.2.5.6. 2. Push in the notch securing the home-position sensor, and remove the sensor from the carriage motor frame. Carriage Motor F r a m e \ Home Position Sensor / Figure 4-34. Removal of Home-Position Sensor 4.2.5.8 Disassembly of Ribbon-Feed Mechanism 1. Remove the printer mechanism (refer to Section 4.2.4.2). 2.
REV.-A 4.2.5.9 Disassembly of The Tractor Unit 1. Remove the E-ring on the tractor shaft. 2. Pull and remove the tractor shaft from the tractor frame. 3. Pull and remove the sprocket guide shaft from the tractor frame. T Tractor Frame (L) Q Y LLJ” ‘Am ‘?;cke’’uide \ A Tractor Shaft Figure 4-36. Removal of Tractor Frame L 4. Remove tractor set L, the paper support, and tractor set R from the tractor and sprocket guide shafts. Tractor Set L , . . Paper Support Tractor Set R .. Figure 4-37.
REV.-A NOTES FOR REASSEMBLY ---- When reassembling, align the phases as shown below. /’ ,4 ‘,, ’-, Figure 4-38.
REV.-A 4.3 ADJUSTMENT This section describes the adjustment procedures necessary when the LX-8 10/850 printer is reassembled or when parts are reinstalled or replaced. These procedures are necessary to ensure the correct operation of the printer. 4.3.1 Platen Gap Adjustment Following the removal of the carriage guide shaft or carriage guide shaft levers, or if printing is abnormal, the gap between the platen and the print head should be adjusted. 1. Remove the printer mechanism (refer to Section 4.2.4).
REV.-A 0.4!5 & 0.01 m m -- \ Printhead Platen Figure 4-40. Platen Gap Adjust Lever \ Carriage Guid Shaft Lever (L Frame (Left Side) Figure 4-41. Carriage Guide Shaft Lever Movement Carriage guide shaft (left): Clockwise rotation widens gap. Counterclockwise rotation narrows gap. Carriage guide shaft (right): Clockwise rotation narrows gap. Counterclockwise rotation widens the gap. Perform gap adjustment at the 10th and 70th column positions, and also at the center of the platen.
REV.-A CHAPTER 5 TROUBLESHOOTING 5.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1. 5.2 UNIT REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-1 .... 5.3 UNIT REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REV.-A 5.1 GENERAL Troubleshooting is based on the idea that error symptoms vary according to the defective component. Troubleshooting may involve either unit replacement or unit repair, each of which is treated separately below. First try to determine the defective unit by referring to section 5.2. The flowcharts in the section should help you to isolate the defective unit. Then refer to section 5.3 for instructions for further checking and for replacement. Section 5.
REV.-A Table 5-2. Symptom and Reference Pages CC;, & L,:.. Problem Symptom Reference Page Printer Fails to Operate with Power Switch ON . Carriage does not move. ● Control panel indicator lamp does not light. 5-3 Abnormal Carriage Operation ● Carriage moves away from home position at power ON. ● The carriage correctly returns to the home position, but the printer then fails to enter READY mode. 5-4 Faulty Printing During Self-Test, but Carriage Operation is Normal ● No printing at all.
(1) Printer Fails to Operate with Power Switch ON 9 START No F 1 on the TA filter Use correct AC input voltage. - END Yes Replace the fuse. Yes Measure the output voltage from power circuit on TAMA boa rd. I No Yes m T7 END v Replace the TAMA board or TA filter unit.
REV.-A (2) Abnormal Carriage Operation I connectors CN5, Yes connecting the SAMA circuit Secure connectors No Yes 4 move to the home Replace the printer mechanism. Yes ;. +.. . Yes No - Replace the TAMA circuit board.
REV.-A (3) Faulty Printing during Self-Test, but Carriage Operation is Normal * No connector between the printer mechanism and TAMA circuit board correctly connected Yes Measure the printhead resistance. (Fig.5- 1 ) • Reinsert then correctly I B Replace the printhead.
REV.-A Printhead o #l o # 2 o # 3 o # 4 o # 5 O ~6 o # 7 O .8 0 # 9 ( Wire assignment) #7x5 I t Coil Resistance: 19.2 A 1.9 Q at 25°C (8etween each dot wire and common.) C O M . x19#18 #“ 1 # 3 #2#4#6 ( Terminal assignment) Figure 5-1.
REV.-A (4) Abnormal Paper Feed (but normal printing) START No ~per’T;e;hLo +> N rotate smoothly when -/ Set the paper correct I y. o Replace the Printer mechanism. turned manually w“th ‘Dower OFF? ) & Yes Yes Replace the TAMA circuit borad.
REV.-A (5) Abnormal Control Panel Operation connector CN3 between the control No Reinsert connector CN3 correctly No 4 No Replace the TAMA circuit board? Yes Replace the control panel.
REV.-A (6) Faulty Printing in ON-LINE Mode NOTE: [t is assumed here that the host computer is operating normally. a START Perform self-test. No Refer to other troubleshooting ite ms. No Replace the TAMA circuit bord.
REV.-A 5.3 UNIT REPAIR This section indicates the points to be checked in response to problems, and the measures to be taken based on the result of the check. Utilize the checkpoints to determine and correct defective components. Tables 5-4 and 5-5, below, are divided into the five following columns: ● Problem: Indicates the problem ● Symptom: Indicates potential condition which may be underlying the problem. You must check to see which if any of the symptoms apply.
REV.-A 5.3.1 TAMA Control Board Unit Repair The following chart shows the main components on the TAMA board. Table 5-3. TAMA Board Parts List Location Parts Name Description Parts No. 2C KPD7810HG CPU X400078 101 3B E05A30 Gate Array Y463800001 3D SRAM2064C-15 SRAM X400 120642 1A SLA7020M Step Motor Driver X440070200 IC ER59256 EEPROM X400592560 3A ~Pc494c Switching Regulator IC X440064940 SRI NJ M78L05 Switching Regulation IC X440078058 Q1 2SD 1833C4 60V, 5.
REV.-A Table 5-4. TAMA Board Unit Repair ,= ,. %,” f“, “,., .-m..
REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Check point Problem Symptom Cause rhe printer The CPU is rhe reset Check the Voltage Waveforms at the ~oes not op- not :ircuit is not + 24V and for the RESET signal. ?rate at all. Dperating. ]perating. Solution ~eplace Q5. selection of Check pin 54 of IC 2C for a changing ~eplace :ontrol ROM signal HIGH/LOW. C3C. s abnormal. IAM is leplace Iefective. C3D.
REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Check point Cause Solution Problem Symptom The printer The CPU is The CPU is Check for oscillator signal at either pin Replace does not op- not defective. 31 or pin 32 of the C P U . CPU. Srate at al 1. operating + ~v -. .: -. .
REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Problem Symptom Check point Cause Solution rhe Carriage The Carriage IC 3B or IC At IC 1A, check the input signal at pin 5 Replace 3B )perates does not op- IA is and the output waveform at pin 1 or 1A. ]bnormally. crate at all defective. Pin 1 Pin 5 + I 50 v Carriage op- The refer- 5V + 21r s Check transistor Q 17, Q18 and Q19. Replace eration is un- ence Volt- Q17, Q18 or stable (lack Q19.
REV.-A Table 5-4.
REV.-A Table 5-4. TAMA Board Unit Repair (Continued) Problem ‘aper is not Symptom The paper ‘ed normally. feed pitch is Check point Cause Solution The IC 3B or At Q21 - Q24, check the base waveform Replace transistor Q21 - Q24. abnormal Q21, Q22, (open-phase) Q23 and Q24 defective. and collector waveform. or IC3B. + ~ Ba se +1 -m+ Col Iect or -m+ +tH- -H+t +, \ — v 5V 2 Ov The paper Q16 OR does not Q20 is feed, or the defective m 2m s m Tex Check transistor Q 16 or Q20.
REV.-A 5.3.2 Printer Mechanism Repair ,F:’: +.- For detailed procedures for replacing or adjusting parts, refer to Sections 4.3 (“Disassembly and Reassembly”) and 4.4 (“Adjustment”). If a problem or system recurs following an attempted repair, refer back to the Tables above to try to find other potential causes. Table 5-5. Printer Mechanism Repair Problem The carriage motor fails to operate.
REV.-A Table 5-5. Printer Mechanism Repair (Continued) Problem Self-test printing is abnormal. ‘aper feed is jefective. Symptom Checkpoint Cause Solution Measure the coil resistance of the printhead. The normal value is approx. 19.2 ohms Replace the printhead Check whether the dot wire broken. Replace the printhead The printhead The printing is too light, or is defective. the print The platen density is not gap is not uniform. properly adjusted. Check whether the tip of the dot wire is not worn.
REV.-A Table 5-5. Printer Mechanism Repair (Continued) Problem Ribbon feed is defective. Symptom Cause Checkpoint Solution The ribbon is The ribbon not fed. cartridge is Dismount the ribbon cartridge, rotate its knob manually, and check whether the ribbon ribbon defective. feeds normally. cartridge. Foreign Check whether the ribbon driving gear rotates when the carriage is moved manually. substances are caught in the gears. Replace the Remove any foreign substance.
REV.-A CHAPTER 6 MAINTENANCE .. 6.1 PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 6.2 LUBRICATION AND ADHESIVE APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 LIST OF FIGURES Figure 6-1. Correct Adhesive Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 Figure 6-2. LX-81 0/850 Lubrication Points . . . . . . . . . . . . . . . . . . . . .
REV.-A Proper maintenance assures optimal and long-term printer performance and and minimizes the occurrence of malfunctions. 6.1 PREVENTIVE MAINTENANCE The case exterior should be regularly cleaned with alcohol. Occasionally vacuum clean the interior of the mechanism to remove accumulated dirt, dust, and paper particles. After the unit has been cleaned, check that it is adequately lubricated (refer to Section 6.2, below).
REV.-A Table 6-2. Lubrication Points (Refer to Figure 6-2) Ref. No.
REV.-A Figure 6-2.
REV.-A APPENDIX A.1 INTEGRATED CIRCUITS WITHIN THE LX-810/850 . . . . . . . . . . . . . . A-1 A.1.l CPU PPD781OHG (2C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 A.1.2 E05A30 (3B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7 A.1.3 2064C SRAM (3D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REV.-A LIST OF TABLES Table A-1. .. TAMA Board ICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1 Table A-2. pPD 7810 Mode Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .A-4 Table A-3. KPD 7811 PF Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .A-4 . Table A-4. KPD 7810 PF Operation .
REV.-A This appendix provides detailed information about the integrated circuits, signal functions, capabilities, and other aspects of the LX-8 10/850 printer components. A.1 INTEGRATED CIRCUITS WITHIN THE LX-810/850 Table A-1 shows TAMA board ICS. Table A-1.
REV.-A A.1.l CPU /APD7810HG (2c) The pPD78 10/781 1 HG is comprised of an 8-bit timer counter, an 8-bit A/D converter, 256 bytes of RAM, and a serial interface. A system can easily be constructed with this IC. The main features of this IC are listed below. O 256 bytes of built-in RAM (addresses FFOOH-FFFFH) 0 4096 bytes mask ROM (addresses O-OFFFH) for the 7811 CPU O Direct addressing of up to 64K O 8-bit A\D converter O 158 instructions O 0.
REV.-A cm u+” 0$ \, o A 0: + b o L n\ n. \ PORT D m o r. v PORT C I 0 b ~ m n. L I 0 II PORT B H PORT A J 1 I m I I =7 ( ID H Q !7 v m 0 x C-4 x Figure A-2.
<,”> * -:; Table A-2. PPD781 O Mode Setting Mode O Mode 1 Externa! Memory o 0 4K, addresses O to OFFF o 1 (Note) 16K, addresses O to 3FFF 1 (Note) 1 (Note) 64K, addresses O to OFFF Table A-3. vPD781 1 PF Operation I PF5 I PF4 I Port Port Port Port Port Port Port 256 bytes (max.) Port Port Port Port AB 11 AB 10 AB9 AB8 4K (max.
REV.-A Table A-5. NPD7810/7811 Port Functions Pin Signal Direction Descriptions 1-8 PAO-7 In/Out Port A 8-bit 1/0 with output latch. 1/0 possible with mode A (MA) register. Output HIGH. 9-16 PBO-7 In/Out Port B 8-bit 1/0 with output latch. 1/0 possible with mode B (MB) register. Output HIGH. 17-24 PCO-7 In/Out Port C 8-bit 1/0 with output latch. Port/control mode can be set by mode control C (MCC) register. Output HIGH. 25 NMI In Non-maskable interrupt of the edge trigger (trailing edge).
REV.-A CPU Timing Refer to Figures A-3 through A-5 for CPU timing diagrams. Three oscillations define one state. The OP f“? %.<. code fetch requires four states. During T 1 to T3, program memory is read, and instructions are interpreted during T4. Address bus lines 15-8 are output from T 1 to T4. Address bus lines 7-O (PD7-0) are used in the multiplex mode. The address is latched during T 1 at the ALE signal.
REV.-A A.1.2 E05A30 (3B) This gate array was newly developed for this printer. Its functions are as follows: 1. Parallel l/F 2. Address decoder 3. Control panel LED drive 4. Data address multiplexer 5. PF motor control 6. CR motor control 7. Printhead drive Figure A-6 shows the E05A30 pin diagram. Table A-6 shows pin functions for the E05A30.
REV.-A *,.,, “+ . . Table A-6. E05A30 Pin Functions Pin No.
REV.-A A.1.3 2(964C SRAM (3D) The 2064C is an 8K-byte CMOS static RAM. The 2064C has low power consumption, and its input\ output level is compatible with the TTL ICS. Figure A-7 shows the 2064C pin diagram, and Figure A-8 shows a block diagram for the 2064C static RAM.
REV.-A <:;, .$: A . 1 . 4 ER59256 (lC) The ER59256 is a 256-bit nonvolatile CMOS RAM containing 16 words x 16 bits, and the data can be transferred serially over the data bus. The ER59256 uses a compact and low-priced 8-pin package. Each bit of RAM is paired with a bit in the nonvolatile electrically programmable ROM (EEPROM) for backup. Data is transferred between the RAM and EEPROM upon receiving an instruction, STORE signal , or RECALL signal from the processor.
REV.-A A.1.5 SLA7020M (1A) The SLA7020M ia a two-circuit, 4-phase step motor driver for unipolar constant current driving. & I 2 3 4 5 6 78 91011 ! 2131415 Figure A-1 1. SLA7020M Case Outline Drawing Qvcc M .$ ~ ~r2 J-C2 ~ Figure A-1 2.
REV.-A A.1.6 pPC494C (3A) The ~PC494C is pulse width modulation control. The block diagram is shown in Figure A-13 s h o w s Low Voltage Reference I I I .*.. z. I I Figure A-1 3.
REV.-A A.2 EXPLODED DIAGRAMS AND SCHEMATICS The exploded and schematic diagrams shown in Figures A-1 4 to A-22 are provided as additional reference. FI Power SW CN 1 0 r e d 26VAC C2 AC INPUT -—L — L1 C3 .— 4= cl ‘ Figure A-1 4.
REV.-A I 1I 1F R I 200Q () (I Swl 4 SW2 3 SW3 2 SW4 10 [n! ) LED2 ,)
REV.-A u r Ey ● “%’g Ei3’ :L__4-4 a Figure A-1 6.
