SERVICE MANUAL MODEL: LM-M340A/D/X,LMS-M340, LM-M342A/X,LMS-M342 MINI HI-FI SYSTEM SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL.
[CONTENTS] ❍ SECTION 1. GENERAL • SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 • ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 • SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 ❍ SECTION 2. ELECTRICAL SECTION • ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1. GENERAL ❏ SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. Storage in conductive bag Drop impact 2. Repair notes 1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care. 2) The pick-up is composed of many optical components and other high-precision components.
❏ ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1.
❏ SPECIFICATIONS - 1-5 -
MEMO - 1-6 -
SECTION 2. ELECTRICAL ❏ ADJUSTMENTS This set has been aligned at the factory and normally will not require further adjustment. As a result, it is not recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers with the adjustment, realignment may be necessary. IMPORTANT 1. Check Power-source voltage. 2. Set the function switch to band being aligned. 3. Turn volume control to minimum unless otherwise noted. 4.
❏ ELECTRICAL TROUBLESHOOTING GUIDE ■ AUDIO PART P-SENS PART CHECK ZD 901(5V) Voltage check YES NO Half-wave rectification wave form check YES IC301 6PIN PATTERN Check NO D713 Replacement R783 check, then ZD901 replacement VKK CHECK CN302 28pin DC -33V check YES ZD902 -33V check YES IC301 87PIN check NO ZD902 replacement Q903 turn on check YES NO Pattern disconnection check C916 -33V and less check YES NO D912, D911 replacement YES Q903 replacement normal - 2-2 - NO Refer to power s
POWER CHECK Every kinds of Fuse check YES NO Fuse replace C901(+), C902(-) DC power output check YES NO CN901 1, 5 AC voltage output check YES NO Power supply Ass’y check and transformer replacent D901 replacement C903(+) DC power output check YES NO CN901, 9, 10 pin DC power output check YES IC901, IC902 power output check YES NO NO Power supply Ass’y check and transformer replacent D902, D903, D904, D905 (1SR35) check and replacement IC901, IC902 check and replacement IC903 power outp
Muting circuit Troubleshooting (if MUTE) Q702(A102) Base “LOW” NO YES Q702 Base and GND operation status check Q701, Q751(IC302) Base “LOW” check YES MUTE No sound IC 601 12, 27 PIN Output check YES NO Refer to IC601(TDA7468D) IC specification IC701 input check (14PIN) YES NO Refer Muting troubleshooting IC701 output check (6PIN) YES NO IC701 12PIN (over 2V) check and power supply circuit check RY701 check NO YES Refer SPK replay troubleshooting normal - 2-4 -
SPK Relay Troubleshooting D704(+) 12V check NO YES Refer power check Q704 Collector “Low” check NO YES Q704 Base “High” YES Output check NO YES RELAY Replacement (RY701) Q704 Replacement normal operation Specific FUNCTION MODE has no sound TAPE YES IC601 3,26 PIN signal input check YES Refer IC202 Troubleshooting AUX YES IC601 5, 24 PIN signal input check YES JK600 signal input check - 2-5 - NO Refer IC501(BU2090) Troubleshooting
CD YES IC601 6,23 PIN signal input check YES CN513 1,3 PIN signal check and refer to CD Troubleshooting TUNER YES IC601 4, 25 PIN signal input check YES Refer TUNERMODULE MIC YES IC602 2PIN check YES Refer to IC404 Troubleshooting IC301 Troubleshooting C301 31, 32, 51, 88 power applied check YES NO Refer to power supply check IC301 6PIN 5V applied check YES NO P-SENS terminal check X301 oscilates or not YES NO X301 replacement When IC301 92Pin voltage input.
IC501 Troubleshooting IC501 16PIN power applied check NO YES Refer to power supply check IC501 2, 3 PIN CLK Data check NO YES IC301 13, 14 PIN data check (When switched to CD, TAPE Function) YES CONTROL function check NO Refer to IC301 Troubleshooting NO IC501 replace YES Pattern check between IC301 and IC501 normal IC601(TDA7468D) Troubleshooting IC601 1PIN power applied check NO YES Refer to power supply check IC601 15,14 Pulse waveform check (with tunning VOL DIAL) NO YES IC301 15,
IC701, IC751 Troubleshooting 3PIN signal input check YES NO Refer to Muting circuit 8, 15Pin(-), 7, 13Pin(+) voltage check YES NO Refer to power supply check 14 Pin signal output check YES NO 9, 10PIN power check (over 5V) OK PLAY check IC202 18Pin VCC power applied YES NO Refer to power supply check IC202 5,20 Pin signal output check YES NO Deck Mecha operation performance check YES Muting circuit check IC202 replacement - 2-8 - NO Deck Mecha replace
Rec check (Q252, Q202 ON : R273, R223 High) IC202 11,14PIN signal input check NO YES Q253, Q203 Base "Low" check YES IC202 9,16 Pin signal input check NO NO Refer to IC203 Troubleshooting Q253,Q203 replacement IC202 18Pin VCC voltage check YES IC201 6(12V), 4 Pin High check YES NO Power check, IC203 Troubleshooting check L203 2,3PIN oscilation check YES NO C236(+) power supply check YES Deck replacement NO Refer to power supply check Q208 Base 0.
■ CD PART TURN ON CD YES NO OPEN CLOSE CHECK CONNECTOR CHECK ( PN808,PN807 ) YES CHECK POWER SUPPLY CIRCUIT( PN808 ) CHECK MICOM INTERFACE CIRCUIT( PN807 ) NO “ READING ” DISPLAY CHECK CONNECTOR CHECK ( PN808,PN807,PN802,PN801 ) YES CHECK MICOM INTERFACE CIRCUIT( PN807 ) NO READING OK CHECK CONNECTOR CHECK(PN801,PN802) CHECK PICKUP MOVEMENT YES CHECK BA5810FP (IC803) CHECK MN6627933CG (IC801) CHECK AN22004 (IC802) IF PLAY, AUDIO OUTPUT CHECK NO CONNECTOR CHECK (PN808) YES OK - 2-10 -
OPEN CLOSE NG CONNECTOR LOCKING CHECK ( PN808,PN807 ) YES CHECK POWER SUPPLY CIRCUIT( PN808 ,PN807) PN808 PIN 5 = 6.
READING DISPLAY CHECK (= ONLY “CD “DISPLAY) CONNECTOR LOCKING CHECK (PN808,PN807,PN802,PN801 ) YES NO CHECK POWER SUPPLY PORT( PN808 ,PN807) PN808 PIN 5 = 6.2V, PIN 7 = 5V PN807 PIN 1 = 5V DEFECTIVE CONNECTOR OR MAIN POWER SUPPLAY YES NO CHECK VOLTAGE THE PIN 2 OF IC805 IC805 PIN2 : 3.
READING OK CHECK (= “NO DISC” DISPLAY) CONNECTOR LOCKING CHECK(PN801,PN802) YES NO DOES SLED MOVE ? A YES DOES LENSE MOVE ? (= UP & DOWN) CHECK PN802 PIN 3,4( SL+,SL-) DEFECTIVE PICKUP OR IC803 OR IC801 OR IC802 NO B CHECK PN801 PIN 13,16 ( FA-, FA+) YES DEFECTIVE PICKUP OR IC803 OR IC801 NO DOES LASER LIGHT ? C CHECK PN802 PIN 10( LD ) YES DOES SPINDLE ROTATE ? DEFECTIVE PICKUP OR IC802 NO D CHECK PN802 PIN 5,6( SP+,SP-) YES DEFECTIVE PICKUP OR IC803 NO IS READING OK ? E CHECK PN801 P
READING OK CHECK #A (= “NO DISC” DISPLAY) A DOES SL+ WAVEFORM APPEAR AT ( IC803 PIN14 AND PN802 PIN3) WAVEFORM #2 SLED MOTOR WAVE NO DOES SLIN WAVEFORM APPEAR AT ( IC803 PIN 5) WAVEFORM #2 SLED DRIVE WAVE NO DEFECTIVE IC801 YES NO DEFECTIVE IC803 NO CHECK PN802 CONNECTOR LINE DEFECTIVE PN802 CONNECTOR YES NO - 2-14 - DEFECTIVE PICKUP SLED MOTOR
READING OK CHECK #B (= “NO DISC” DISPLAY) B DOES FA+ WAVEFORM APPEAR AT ( IC803 PIN15 AND PN801 PIN16) WAVEFORM #3 FOCUS COIL DRIVE WAVE NO DOES FAIN- WAVEFORM APPEAR AT ( IC803 PIN 26) WAVEFORM #3 FOCUS DRIVE WAVE NO DEFECTIVE IC801 YES NO DEFECTIVE IC803 NO CHECK PN801 CONNECTOR LINE DEFECTIVE PN801 CONNECTOR YES NO - 2-15 - DEFECTIVE PICKUP FOCUS ACTUATOR
READING OK CHECK #C (= “NO DISC” DISPLA) C IS ?V APPLIED TO PIN10 OF PN801 LASER SUPPLY VOLTAGE CHECK NO IS 3.3 V APPLIED TO PIN3 OF IC802 RF IC SUPPLY VOLTAGE CHECK YES IS 2.
READING OK CHECK #D (= “NO DISC” DISPLAY) D DOES SP+ WAVEFORM APPEAR AT ( IC803 PIN12 AND PN802 PIN6)WAVEFORM #4 SPINDLE MOTOR DRIVE WAVE NO DOES SPIN WAVEFORM APPEAR AT( IC803 PIN 6) WAVEFORM #4 SPINDLE DRIVE WAVE NO DEFECTIVE IC801 YES NO DEFECTIVE IC803 NO CHECK PN802 CONNECTOR LINE NO - 2-17 - DEFECTIVE PN802 CONNECTOR DEFECTIVE PICKUP SPINDLE MOTOR
READING OK CHECK #E (= “NO DISC” DISPLAY) E DOES TA+ WAVEFORM APPEAR AT ( IC803 PIN17 AND PN801 PIN15) WAVEFORM #5 TRACKING COIL DRIVE WAVE NO DOES TAIN- WAVEFORM APPEAR AT ( IC803 PIN 23) WAVEFORM #5 TRACKING DRIVE WAVE NO DEFECTIVE IC801 YES NO DEFECTIVE IC803 CHECK PN802 CONNECTOR LINE NO DEFECTIVE PN802 CONNECTOR NO DEFECTIVE PICKUP OR IC802 NO DEFECTIVE PICKUP OR IC802 YES DOES ARF SIGNAL APPEAR? (IC802 PORT 8) WAVEFORM #6 YES DOES FE, TE SIGNAL APPEAR? (IC802 PORT FE:23, TE:21) WAVEFOR
WAVEFORMS OF MAKOR CHECK POINT - 2-19 -
#4. SPINDLE DRIVE AND MOTOR WAVEFORM (IC503 pin6, 1 2) when TOC reading #5. TRACK DRIVE AND MOTOR WAVEFORM (TP560, IC503 pin23) during normal play #6.
❏ INTERNAL BLOCK DIAGRAM of ICs • NJM2706M (IC1) BLOCK DIAGRAM PIN CONFIGURATION - 2-21 -
• BA3126N (IC201) BLOCK DIAGRAM PIN CONFIGURATION - 2-22 -
• KIA6289N (IC202) BLOCK DIAGRAM - 2-23 -
- 2-24 -
- 2-25 -
- 2-26 -
• BU2090F (IC 501) 12-bit, Serial IN, Parallel OUT driver Vss 1 DATA 2 Control circuit 12-bit shift register CLOCK 3 16 VDD 15 Q11 14 Q10 Latch Q0 4 Q1 5 BU2090/F/FS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pin No. BU2092/F 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 13 Q9 Output buffer (open drain) 12 Q8 Q2 6 11 Q7 Q3 7 10 Q6 Q4 8 9 Q5 BU2092/FV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 - 2-27 - Pin name Function Vss DATA CLOCK LCK Q0 Q1 Q2 Q3 Q4 Q5 Q6 N.C. N.C.
• TDA7468D (IC601) BLOCK DIAGRAM - 2-28 -
PIN CONFIGURATION - 2-29 -
• STK403-070 (IC701) BLOCK DIAGRAM - 2-30 -
• N6627933CG (IC801) Pin Assignment Note) Pins marked with an asterisk can be switched to different signals by using microcontroller commands.
Internal Block Diagram - 2-32 -
Pin Descriptions Pin No.
Pin No. 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Symbol PLLFO AVSS1 LOOUTL LOVSS1 LOOUTR LOVDD1 N.C. TMON1 N.C. N.C.
• BA5810FP (IC803) • KA3082 (IC 807) Bi-Directional DC Motor Driver Description The KA3082 is a monolithic integrated circuit designed for driving bi-directional DC motor with braking and speed control, and it is suitable for the loading motor driver of VCR, CDP, and TOY systems. The speed control can be achieved by adjusting the external voltage of the speed control pin. It has two pins of logic inputs for controlling the forward/ reverse and braking.
• KIA7805AP/API (IC 901) THREE TERMINAL POSITIVE VOLTAGE REGULATORS 5V, 6V, 8V, 9V, 10V, 12, 15V, 18V, 24V.
- 2-37 -
• KIA78R12PI (IC 903) 4 TERMINAL LOW DROP VOLTAGE REGULATOR The KIA78RXX Series are Low Drop Voltage Regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220 4 termainal lead full molded PKG. The Regulator has multi function such as over current protection, overheat protection and ON/OFF control.
❏ BLOCK DIAGRAM 2-39 2-40
❏ SCHEMATIC DIAGRAMS • MAIN SCHEMATIC DIAGRAM 2-41 2-42
• MAIN-OAO SCHEMATIC DIAGRAM 2-43 2-44
• DECK SCHEMATIC DIAGRAM 2-45 2-46
• FRONT SCHEMATIC DIAGRAM 2-47 2-48
• CDP SCHEMATIC DIAGRAM 2-49 2-50
• POWER SCHEMATIC DIAGRAM NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. 2-51 NOTE: 1. Shaded(■) parts are critical for safety.Replace only with specified part number. 2. Voltages are DC-measured with a digital voltmefer during Play mode.
❏ WIRING DIAGRAM CN901 PN901 PN401 2-53 2-54
❏ PRINTED CIRCUIT DIAGRAMS • MAIN P.C.
• MAIN P.C.
• POWER P.C.
• POWER P.C.
• FRONT P.C.
• FRONT P.C.
• CD MAIN P.C. BOARD (COMPONENT SIDE) • CD MAIN P.C.
SECTION 3.
• TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) 021 505 019 020 018 007 008 017 016 003 015 022 401 023 009 401 502 501 026 025 403 504 009 401 030 011 027 401 028 013 029 3-3 3-4 LOCA. NO. LG PART NO.
• TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) 006 021 506 001 505 037 020 019 018 007 016 008 017 402 401 002 A01 003 402 015 022 502 507 009 401 023 502 501 026 403 028 032 025 504 038 009 027 401 031 040 406 028 011 039 409 036 029 035 013 3-5 3-6 LOCA. NO. A00 A01 001 002 003 006 007 008 009 011 013 015 016 017 018 019 020 021 022 023 025 026 027 028 029 031 032 035 036 037 038 039 040 401 402 403 406 409 501 502 504 505 506 507 LG PART NO.
• CD MECHANISM 416 151 159 156 422 418 165 419 155 173 164 LOCA.NO.
SECTION 4.
- 4-2 -
