Repair Manual Digital Palettes Color Film Recorders (CI3000 / CI5000) October 1990 Americas Business Center Technical Services 201 Burlington Road Bedford MA 01730 TEL: 1.781.386.5309 FAX: 1.781.386.
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POLAROID DIGITAL PALETTE SERVICE MANUAL CONTENTS SECTION 1 GENERAL DESCRIPTION SECTION 2 THEORY OF OPERATION SECTION 3 TROUBLESHOOTING SECTION 4 PARTS REPLACEMENT SECTION 5 CALIBRATION & ADJUSTMENTS
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GENERAL DESCRIPTION 1. General Description Table of Contents A. B. Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1. 2. 3, 4. 5. 6. 1-3 1-4 1-4 1-5 1-5 1-5 Model CI-3000 and Model CI-5000 . . . . . . . . . . . . . . . . . . . . Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Film Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Film Types . . . . . . . . . . . . . . . . . . .
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GENERAL DESCRIPTION A. Product Description The Polaroid Digital Palette Film Recorder system is a high resolution imaging device that produces slides and prints in a variety of formats, using an almost unlimited spectrum of colors. It represents the next generation of Polaroid desktop film recorders. 1. Model CI-3000 and Model CI-5000 The system consists of two models: o The Model CI-3000 (Figure 1-1) is designed to operate with IBM or compatible computers only.
GENERAL DESCRIPTION 2. Resolution The Model CI-3000 is capable of imaging at resolutions up to 2048 X 1366 (2K), and the Model CI-5000 can achieve resolutions of up to 4096 X 2732 (4K). Color resolution is 256 levels for each primary color (red, green, and blue) resulting in a color space of 16.7 million colors. 3.
GENERAL DESCRIPTION 4. 5.
GENERAL DESCRIPTION B. Major Components Figure 1-3 shows the major components of the Digital Palette Film Recorder system. Figure 1-3.
GENERAL DESCRIPTION 1. Monitor Board 2. The Monitor Board contains the electronics that control the characteristics of thet CRT - horizontal and vertical deflection, high voltage, luminance, COS4 exposure correction, focus, and the digital video cathode driver. Logic Board The Logic Board provides the communications link - receiving and confirming signals from the host computer. It contains the Centronics Board for parallel interface and a microprocessor for controlling all memory.
GENERAL DESCRIPTION C. Controls and Indicators The function of each of the controls and indicators shown in Figure 1-3 is described in Table 1-1. Table 1-1. Controls and Indicators Controls Indicators Front Panel: Main Power Switch Turns the system on and off. Front Panel LED When lit, indicates the unit is on. Control Cable Connector Accepts control cable for powering the 35mm and AutoFilm camera backs. Rear Panel: Reset Button Resets the system without powering down.
GENERAL DESCRIPTION D. Dimensions and Specifications 1. Dimensions and Weight (without camera back) Height: Width: Length 2. 3. 7.125" 7.75" 16.00" (18.097 CM) (19.685 CM) (40.640 CM) Addressable Resolution (Assuming square pixels) Model CI-3000 Model CI-5000 35 mm Format: 2048 X 1366 4096 X 2732 AutoFilm/Pack Formats: 2048 X 1536 4096 X 3072 4 X 5 Format: 2029 X 1536 4058 X 3072 Addressable Color Space 256 levels per primary color (16.7 million colors) 4.
GENERAL DESCRIPTION 6. Power Requirements The units meet domestic and international requirements (switchable). +5V and +12V; 110 to 220VAC at 50/60Hz. 7. Safety Requirements The units meet all Polaroid standard safety and certification requirements (e.g. UL, CSA, FCCB, TUV and VDE). E. Image Recording Features Here are some special features of the Digital Palette Film Recording system: o It is a variable and high addressability system ranging from 256 to 4096 pixels.
THEORY OF OPERATION 2. Theory of Operation Table of Contents A. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 B. Exposure System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 1. Component Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8 a. b. c. d. e. 2. C. D. Camera (Back) Adapter Assembly. . . . . . . . . . . . . . . . . . . . . . .
THEORY OF OPERATION 3. Random Access Memory (RAM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 a. b. c. d. e. f. 4. Video Generation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39 5. Vertical Deflection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40 6. Horizontal Sync Signal Generation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41 a, b. c. d.
THEORY OF OPERATION 4. CRT Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63 a. b. c. d. Cathode Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65 6. Horizontal Deflection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66 7. Beam Deflection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66 Beam Shaping. . . . . . . . . . . . . . . . . . . .
THEORY OF OPERATION 3. Logic Controller P.C. Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82 o o o o o o o Microprocessor Control Network/DRAM Memory VRAM Memory Horizontal Timing Down Counter Video Generation and Pixel Clock Frequency Synthesizer Hardware Control/SCSI Interface Centronics Parallel Port Interface Network Vertical Deflection/Auto Luminance Control Sheet 1 Sheet 2 Sheet 3 Sheet 4 2-82 2-83 2-84 2-85 Sheet 5 Sheet 6 Sheet 7 2-86 2-87 2-88 4. Monitor P.C.
THEORY OF OPERATION List of Illustrations Figure 2-1 Exposure System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 Figure 2-2 AC/DC Power System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 Figure 2-3 Logic Controller P.C. Board Simplified Block Diagram. . . . . . . . . . . 2-17 Figure 2-4 Phase-Locked Loop Frequency Synthesizer Block Diagram. . . . . . . . 2-46 Figure 2-5 Monitor P.C. Board Simplified Block Diagram. . .
THEORY OF OPERATION List of Tables Table 2-1 DC Power System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Table 2-2 Microprocessor's Internal Timers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18 Table 2-3 External Interrupt Controller Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 Table 2-4 Device I/O Data Select Lines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20 Table 2-5 DMA Controller Channels.
THEORY OF OPERATION A. Introduction Note Refer to the provided user manuals for a detailed description of the host computer and its software. This section of the Service Manual pertains to the Digital Palette hardware. It describes the major systems that make up the Digital Palette and how each system interfaces with the host computer and its software to create an image on the CRT display screen. There are five major systems internal to the Digital Palette.
THEORY OF OPERATION B. Exposure System The Exposure System (Figure 2-1) consists of a camera (back) adapter assembly. a filter wheel assembly, a filter wheel photo interrupter (position sensor), a filter wheel stepper motor, an auto luminance photodiode assembly (brightness sensor), and a CRT display assembly. 1. Component Description a. Camera (Back) Adapter Assembly Four Polaroid camera back assemblies can be used with the Digital Palette.
THEORY OF OPERATION Digital Palette is designed for use with Polaroid 35mm film and conventional Polaroid color film. However, conventional 35mm films can be used if their exposure instructions are programmed into the Digital Palette software. For hardcopy of the computer-generated images, the Polaroid Pack Film, AutoFilm, and 4 x 5 Film Camera Backs can be used with their applicable film: b.
THEORY OF OPERATION move the filter wheel to its start (0) position. If the next instruction is to a higher filter position, the filter wheel rotates directly to the specified position. If the instruction is to a lower filter position, the microprocessor control circuit directs the filter wheel to first rotate to the start (0) posi tion and then counts to the requested filter position. The filter wheel assembly has six notches (or slots) on its rim.
THEORY OF OPERATION P.C. Board increment the stepper motor. As the stepper motor turns, it rotates the filter wheel assembly until the specified colored filter (red, green, or blue) is positioned between the CRT and the film. e. Auto Luminance Photodiode Assembly (Brightness Sensor) The auto luminance photodiode assembly is a photosensitive diode that is mounted on the Digital Palette housing.
THEORY OF OPERATION C. Power Supply Module 1. AC Power The Digital Palette operates from domestic or international commercial AC Power (Figure 2-2) applied through the Main Power Switch and the Switchable Voltage Selector. Note The Digital Palette meets domestic and international power requirements. It automatically operates from 100/115 to 220/240 volts at 50/60 Hz, commercial AC power. When the Main Power Switch is set to its ON position, AC power is applied to the Power Supply Module.
THEORY OF OPERATION o Optional Daughter Board via connectors J1 and J2 on the Logic Controller P.C Board. Figure 2-2 shows the DC Power system. Table 2-1 identifies the output voltage/voltages for a particular connector/connectors and indicates the electronic circuitry that it powers. Ground Power Supply Module Power Receptacle Main Power ON/OFF Switch J52 Refer to System Interconnection Wiring Diagram in Section G for Detail Pin Connections and DC Power Distribution. J53 J51 Logic Controller P.C.
THEORY OF OPERATION Table 2-1. DC Power System (Con't) Connector Output Voltage J51 (Con't) +12V_LB Function This dc output voltage powers the following on the Logic Controller P.C. Board: o o o o o o J52 -12V_A This dc output voltage powers the following on the Monitor P.C. Board: o o o +12V_B Luminance circuit. Vertical deflection circuit (S-Distortion Correction, Height, Center, and Driver). COS4 exposure correction circuit. This dc output voltage powers the following on the Monitor P. C.
THEORY OF OPERATION Table 2-1. DC Power System (Con't) Connector Output Voltage J53 (Con't) +12V_A Function This dc output voltage powers the following on the Monitor P.C. Board: o o J51/J53 VCC (+5vdc) 2-15 Horizontal deflection circuit (Center, width, and Linearity). CRT heater filament. The dc output voltages via these connectors supply +5 vdc to power the digital circuits on the Logic Controller P.C. Board (Sheets 1 - 7).
THEORY OF OPERATION D. Logic Controller P.C. Board The Logic Controller P.C. Board contains all the necessary electronic circuitry to con trol the Digital Palette operations specified by the computer software and to communi cate with the host computer. The electronic circuits that make-up the Logic Controller P.C.
THEORY OF OPERATION 128K VRAM (Optional) Centronics Connector Centronics Interface Video Generation 128K VRAM Connector SCSI Board HSYNC Generation Data Address Buffers Monitor P.C. Board 512K DRAM (Optional) Luminant D/A Vertical Deflection D/A 128K DRAM RAM Address Multiplexer CPU Autoluma A/D Address Latches 128K EPROM Stepper Motor Drive Filter Wheel Camera Back Control Camera Back Figure 2-3. Logic Controller P.C.
THEORY OF OPERATION interface, it interprets (decodes) them and then directs the specified operating function of the Digital Palette - downloads pixel image information from Dynamic Memory to Video Memory, correctly positions the filter wheel so that the specified color filter is placed between the film frame and the CRT display screen, opens the attached camera back shutter, exposes the pixel image information, closes the attached camera back shutter, ejects or advances the film frame.
THEORY OF OPERATION Table 2-2. Microprocessor’s Internal Timers (Con't) Timer Function Timer 1 (TIMR1) (Con't) The XTALHS signal is used to drive the phase detector of the pixel clock frequency generator. Timer 2 (TIMR2) This internal timer generates a 1 msec interrupt signal that is used for program timing. IT IS ONLY USED FOR INTERNAL COUNTING. IT HAS NO INPUT/OUTPUT LINES. 2) Programmable Interrupt Controller Lines The microprocessor has four external interrupt controller lines.
THEORY OF OPERATION 3) Device I/O Select Lines The microprocessor has 64 Kbytes of I/O space. Within this I/O space, the microprocessor is capable of generating select signals for up to seven devices. The select lines are active for seven contiguous blocks of 128 bytes above a programmable base address. This base address is set by the start up code to be 0x0000 in the I/O space. Table 2-4 lists and describes the microprocessor’s select lines that control the various devices on the Logic Controller P.C.
THEORY OF OPERATION Table 2-4. Device I/O Data Select Lines (Con’t) Select Line PCS2 Function This select line is asserted for I/O addresses 0x100 to 0x17F.
THEORY OF OPERATION 4) DMA Controller Channels The microprocessor has two general purpose DMA controller channels: DMA controller channel 0 and DMA controller channel 1. It also has a third type DMA controller channel transfer that is generated externally. Table 2-5 lists and describes the DMA controller channels. Table 2-5. DMA Controller Channels DMA Controller Channel Function DMA 0 This DMA controller channel is available for general tasks.
THEORY OF OPERATION 5) Programmable Memory The Microprocessor Control Network (Figure 2-9, sheet 1) uses three types of memory: o o o Erasable Programmable Read Only (EPROM) Dynamic Random Access Memory (DRAM) Video Random Access Memory VRAM) Refer to the paragraphs D3, D4, and D5 for a detailed description of how the Microprocessor Control Network uses its available memory. b.
THEORY OF OPERATION Table 2-6. Clock Signals from Microprocessor Clock Signal Function OUTCLK This microprocessor clock signal operates: o o o o HSYNC This microprocessor clock signal operates: o o o XTALHS c. Control PAL for the microprocessor. Addressable latches for the microprocessor. Control PAL’s for the Horizontal Timing Generator. Addressable latch for the optional SCSI Parallel Interface. Horizontal Sync Driver.
THEORY OF OPERATION The generated RESET signal initializes: o o Horizontal Timing Generator (Control PAL, Pixel Latch, Horizontal 9-Bit Down Counter). Video Generation Circuit (Address Latch). Upon Power-up or manual Reset, the firmware in EPROM will perform system diagnostics. If any diagnostics fail, the front panel LED will blink the familiar SOS pattern. If all diagnostics pass, the LED will by turned on.
THEORY OF OPERATION When the Digital Palette operator momentarily presses the RESET switch, the Reset Control circuit generates a reset signal that initializes the Microprocessor Control network and its associated circuitry. The reset signal from the RC network of the Reset Control circuit is ac coupled so that the switch can bepressed for an extended period of time (in the order of a few seconds).
THEORY OF OPERATION For detailed information pertaining to the RESET command from the host computer, refer to the Digital Palette Product Specification Manual or the applicable Parallel Port Interface Specifications Manual. d. Address Latches Address latches (figure 2-9, sheet 1) are used because the microprocessor has a multiplexed address/data communications bus. At the beginning of a memory or an I/O cycle, the applicable address appears on the communications bus.
THEORY OF OPERATION Table 2-7. Microprocessor Control PAL Select Signals Select Signal Function SCSICS Asserted during an IO read/write cycle to the optional SCSI device. This signal is guaranteed to be asserted only while the address lines are stable. DRAMCS Asserted during a memory read/write cycle to the base 128K bytes of memory. VRAMCS Asserted druing a memory read/write cycle to the VRAMS. NOTE: For memory read/write cycles to the optional 512K DRAM, both DRAMCS and VRAMCS are asserted.
THEORY OF OPERATION f. Communications Bus The communications bus consist of 16 lines. It functions as an address/data bus and a latch /address bus. As an address/data bus, it provides the signal flow path for all data and instruction codes between the Digital Palette and the host computer. It also provides the signal flow path for all data and instruction codes between the microprocessor and the electrical devices that control the operations of the Digital Palette.
THEORY OF OPERATION 3. Random Access Memory (RAM) The Digital Palette uses two types of Random Access Memory: Dynamic Read Address Memory (DRAM) and Video Random Access Memory (VRAM). The DRAM memory receives and stores the commands and pixel image data via the applicable parallel interface from the host computer. Its the exposure sequence (Start Exposure, Parameters, Expose Color, Pixel Image Data for a particular color, and Terminate Exposure) that is loaded into the DRAM’s.
THEORY OF OPERATION The Digital Palette with the optional VRAM’s added (Additional 128K of VRAM) provides the ability to expose images with a horizontal resoultion up to 4096 pixels. Refer to paragraph d for a functional explanation of the VRAM Internal Shift Register. c.
THEORY OF OPERATION Table 2-8. RAM Control PAL’s Control PAL RCTLP1 Function The RCTLP1 control PAL provides the following operation signals: o RSEL2 RSEL1 RSELO - Control signals sent to the RAM Address Multiplexer PALS, RCTLP4 and RCTLP5. These control lines are used to indicate which addresses are sent to the DRAMS and VRAMS. o VCASEN - VRAM CAS enable. Asserted when CAS (Column Address Strobe) should be asserted on the VRAMS. o DCASEN - DRAM CAS enable.
THEORY OF OPERATION d. DRAM and VRAM Refresh All of the DRAM’s and VRAM’ have the CAS before the RAS refresh feature. With this type of feature, row address data is not required to properly refresh the DRAM’s. For normal operation, the refresh occurs as part of a TIMTBL DMA cycle. For DRAM’s, an entry is read from the timing table and then placed on the Address/Data communications bus. The CAS and output enables signals for the DRAM and VRAM memories are maintained which maintains the data.
THEORY OF OPERATION Before the timing table is set, or when entries in the timing table are changed, the TIMTBL DMA should be disabled. This is performed with a single I/O instruction which asserts the /RFSHEN function for the RCTLP3 control PAL. When /RFSHEN is asserted, two things occur: first, HOLD is not generated by horizontal timing (HTIMP3) PAL and, therefore, TIMTBL DMA cycles do not occur; second, the signal /RFSHALL is generated and sent to the RCTLP1 control PAL.
THEORY OF OPERATION DMA controller channel 1 of the microprocessor performs the VRAM shift register load operation after each horizontal scan line. It is setup to read a memory location and to write an I/O location. The internal counter of the DMA controller channel 1 is setup to decrement after each horizontal scan line and to generate an interrupt when its count reaches zero.
THEORY OF OPERATION When the DMA controller counter counts down to zero indicating that the specified number of horizontal scan lines has occurred and that the particular level has been exposed, an interrupt service routine (DMA1ISR) is generated. This interrupt service routine resets the DMA source address and the DMA counter for the next VRAM shift register load cycle.
THEORY OF OPERATION latched and remembered, then the subsequent intermediate VRAM shift register load will read the next row in VRAM by using the upper 7-bits from the most recent DMA controller channel 1 cycle and setting the LS row address bit to one. In order to synchronize an intermediate shift register load, a normal VRAM shift register load cycle must begin before the current shift register contents are transferred. The beginning of the cycle does not have to be synchronized with the video clock.
THEORY OF OPERATION Table 2-9. TIMTBL Control Bits (Con't) Control Bits Function VRSR2 VRSR1 1 0 This control function indicates a VRAM intermediate load 2. The row loaded is determined by the upper 6-bits of the previous DMA1 VRAM load. Row address 1 is a 1 and row address 0 is a zero. 1 1 This control function indicates a VRAM intermediate load 3. The row loaded is determined by the upper 6-bits of the previous DMA1 VRAM load. Row address 1 and row address 0 are one. f.
THEORY OF OPERATION signal. This VROE signal is asserted during a VRAM read and a VRAM shift register load cycle. During the VRAM cycle, VROE is asserted after the assertion of the VRAS signal. During a VRAM shift register cycle, VROE is asserted before the assertion of the VRAS signal. The trigger control in the Horizontal Generation circuit generates the TRGSYNC signal. 4.
THEORY OF OPERATION Because the VRAM’s cannot run as fast as the video rate, a number of VRAM bytes must be read and compared in parallel. The four comparator outputs (VID0 - VID3) are then applied to the 4-bit latch in the Video Generation circuit. Note For 2048 (2K) pixel wide systems, four VRAM’s are required to generate two bytes of pixel data in parallel. For 4096 (4K) pixel wide systems, eight VRAM’s are required to read four bytes of pixel data simultaneously.
THEORY OF OPERATION the VDEFLCT signal is used to drive the vertical yoke of the CRT. At the end of each horizontal scan line, the microprocessor network flags the vertical deflection instructions from the EPROM. The EPROM applies the specified vertical deflection instructions to the input of the microprocessor net work via the Address/Data communications bus.
THEORY OF OPERATION a. Horizontal Sync and Video Timing Generation The Horizontal Sync (HSYNC) and Video Enable signals are generated by a background DMA process which loads a control register and down counter from a table of data in memory. There are four major time states which must be generated: the Horizontal Sync (HSYNC), back porch, video enable, and front porch.
THEORY OF OPERATION Table 2-10. Significance of Address Segment Bits Bit Line AD15 HSYNC Function If this bit is true, the next time state will be an horizontal sync (HSYNC) state. The HSYNC line will be asserted. When the HSYNC line is asserted , bits AD11 through AD14 function as follows: AD14 Not Used AD13 DATAEN AD12 Not Used AD11 Not Used The data enable (DATAEN) line gets signals from the video section.
THEORY OF OPERATION b. Horizontal Timing Down Counter The Horizontal Timing Down Counter (Figure 2-9, sheet 3) is a 9-bit counter. It is driven by a clock which is one-half the frequency of the output of the Frequency Synthesizer. The video PAL (VIDEP1) is clocked by the output of the Frequency Synthesizer and has an output called 20M. The Frequency Synthesizer output has a nominal frequency range of 20 MHz to 40 MHz. The 20M signal has a nominal frequency range of 10 MHz to 20 MHz.
THEORY OF OPERATION the /HLDA signal, is sent to the control PAL 1 (U45) to indicate that a DRAM read cycle should occur. /HLDA is also sent to the control PAL 3 (U48) so that the time table offset is asserted on the Latched Address Bus (LA9 - LA12). The /HLDA signal is also available to the RAM control PAL’s so that the appropriate RAM address lines (RA) are asserted. Notice that data bit 10 (AD10) and /HLDA2 are inputs to control PAL 3 (U48). This is the ENDTABLE bit.
THEORY OF OPERATION F in A > > Phase Detector > Amplifier/ Filter > Voltage Controlled Oscillator F out > F in B < /N Counter < Figure 2-4. Phase-Locked Loop Frequency Synthesizer Block Diagram The phase-locked loop frequency synthesizer, when operating properly, locks onto an input signal, tracks it in frequency, and outputs a fixed phase signal relative to its input signal. The input frequency to the phase-locked loop (Fin A) is crystal controlled.
THEORY OF OPERATION One output of the horizontal timing circuitry is the synthesized Horizontal Sync (/HSYNC) signal. This signal is used as the feed-back input to the phase detector. For a detailed description of a typical phase-locked frequency synthesizer, refer the Motorola MECL Device Data Book. 7. Auto Luminance (Brightness) Control The Auto Luminance Control (Figure 2-9, sheet 7) automatically monitors and maintains the CRT beam at its adjusted luminance (brightness).
THEORY OF OPERATION 8. Digital Palette Operations a. Camera Back Control The Digital Palette supports a number of different camera backs: 35mm, Pack Film, Auto Film, and 4 x 5. The user can routinely change from one camera to another. Each camera back can accept one or more different types of films. The Camera Back Control circuit indicates which type of camera is currently attached, but the host computer software must set a parameter to indicate the type of film that is loaded in the attached camera.
THEORY OF OPERATION Table 2-11. Camera Type Codes 1-Byte Code ASCII String 128 (80 hex) 129 (81 hex) 130 (82 hex) 131 (83 hex) Pack Film 35mm Auto Film 4x5 When a camera back is attached to the Digital Palette, camera back data (CBDATA 1-4) indicating the camera back type is applied via connector J11 to the data select lines of a dual 4-line to 1-line data selector/multiplexer.
THEORY OF OPERATION Note If the film parameter specified by the Expose Color command (set by the host computer software) is inappropriate for the attached camera, the Digital Palette will not allow a picture or slide to be taken. The film parameter appropriate for the attached camera must be set by the host computer software.
THEORY OF OPERATION camera back shutter to open allowing the video image that is displayed on the CRT to expose the film. Once the exposure sequence is completed, the CADVANCE signal is removed causing the camera back shutter to close. Closing the camera back shutter causes the internal mechanism of the camera back to: b. o Eject the exposured film frame for a non-motorized camera back (Pack Film and 4 x 5). The user must manually remove the ejected film frame.
THEORY OF OPERATION Upon command, the octal addressable latch outputs the necessary drive pulses to the stepper motor drive network. The stepper motor drive network properly phases the output pulses from the octal addressable latch and then applies them via connector J6 to the stepper motor. The stepper motor rotates the filter wheel assembly in a clockwise (CW) direction with respect to the front of the Digital Palette.
THEORY OF OPERATION paragraph 4 in this Section of the Service Manual for a functional description of the Digital Palette buffer memory. Upon receipt of this command, the microprocessor network removes and executes the Expose Color command from the buffer memory. It flags the specified colored filter instructions from the EPROM. The image data specified by this command will be exposed once the the filter wheel is rotated to the specified colored filter position.
THEORY OF OPERATION If it is determined that the filter wheel is positioned correctly (specified colored filter between monitor display screen and the selected camera), the microprocessor network stops sending filter wheel position output data to the stepper motor drive network. The stepper motor stops, leaving the filter wheel with the specified colored filter in front of the monitor display screen.
THEORY OF OPERATION c. Filter Wheel Position Control The Filter wheel Position Control circuit (Figure 2-9, sheet 5), in conjunction with the microprocessor network, positions the colored filter specified by the host computer Expose Color command between the monitor display screen and the selected camera. Before an exposure takes place, the Expose Color command is sent by the host computer via the applicable parallel interface to the Digital Palette buffer memory.
THEORY OF OPERATION E. Monitor Assembly The Monitor Assembly used in the Digital Palette is basically a medium resolution black-and-white television. It consists of a rectangular Cathode Ray Tube (CRT) and a Monitor P.C. Board. The Monitor P.C. Board contains a flyback transformer and the electronic circuits required to drive the CRT. The parallel interface port on the rear of the Digital Palette accepts a computer-generated image from the host computer. The Logic Controller P.C.
THEORY OF OPERATION Each control listed in Table 2-12 is used in conjunction with the provided Digital Palette Test Software (Test Diskette) for its applicable adjustment. Refer to the Calibration and Adjustment Section in this Service Manual for a detailed description on how each control is used in conjunction with the provided Test Diskette.
THEORY OF OPERATION Table 2-12. Monitor P.C. Board Controls Name Number Function COARSE LUMA R46 This control adjust the coarse luminance (brightness) of the CRT video display to a level that is easily visible to the eye. It adjust the electron flow through grid 1 of the CRT for a coarse brightness of approximately 6 foot-lamberts. FINE LUMA R47 This control adjust the fine luminance (brightness) of the CRT video display.
THEORY OF OPERATION Table 2-12. Monitor P.C. Board Controls (Con’t) Name Number V COS4 R26 CRT Centering Rings Function This control vertically adjust for even illumation of the CRT video display. The radial luminance of the CRT video display is increased preventing light fall-off in the corners. It provides an even exposure in the finished print/slide - no dark corners. The centering rings are located on the CRT Yoke.
THEORY OF OPERATION 2. Cathode Ray Tube a. Components The Cathode Ray Tube (Figure 2-6) used in the Digital Palette is a 3-inch rectangular tube. It consists of: o o o o o b. White Phosphorous-Coated Display Screen Three-Grid Electron Gun Grid 1 - Brightness (Pin 1) Grid 2 - Accelerator (Pin 6) Grid 3 - Focus (Pin 7) Cathode (Pin 2) Heater (Pins 3 and 4) Anode Functional Description When the CRT is turned on, its electron flow increases.
THEORY OF OPERATION Note This principle is based on the rule in electricity and electronics that like poles repel and unlike poles attract. After the stream of electrons is focused into a beam and accelerated, it speeds toward the display screen of the CRT. A high positive anode voltage attracts the beam towards the display screen. The inner section of the display screen is coated with phosphor, and when the accelerated beam strikes the phosphor coating, the phosphor fluoresces and emits light.
THEORY OF OPERATION 3. DC Power As previously stated, the Monitor P.C. Board contains all the necessary electronic circuits to process the digital video signals and to drive the CRT. DC power to operate its electronic circuits and to drive the CRT is supplied by the Power Supply Module. Refer to Section C in this Service Manual for detailed information on how the Power Supply Module distributes regulated DC power to the Monitor P.C. Board.
THEORY OF OPERATION c. -12V_A Regulated DC Voltage The -12V_A Regulated DC Voltage is supplied via connector J4 on the Logic Controller P.C. Board and connector J9 on the Monitor P.C. Board. This regulated DC voltage is used for the following: o o o 4. Negative bias for the Auto Luminance circuit. Negative bias for the Vertical Deflection circuit (S-Distortion Correction, Height, Center, and Driver). Negative bias for the COS4 Exposure Correction circuit.
THEORY OF OPERATION secondary windings. The high voltage pulse from the secondary windings of the flyback transformer is then applied to a high voltage rectifier. This high voltage rectifier converts the developed high voltage pulse to a DC voltage of +8.5 kilovolts. This converted voltage drives the anode of the CRT. When the Digital Palette is turned off, the high voltage supplied to the anode of the CRT shuts off.
THEORY OF OPERATION d. +850 VDC This voltage drives accelerator grid 6 and focus grid 7 of the CRT. When the Horizontal Deflection circuit applies a flyback pulse to the primary winding of the flyback transformer, a voltage output pulse from tap 8 of the flyback transformer secondary winding is applied to a voltage rectifier. The voltage rectifier converts the voltage output pulse into a positive dc bias voltage.
THEORY OF OPERATION To maintain a stable CRT beam (image, brightness, and focus) with changing Digital Palette loads, the Cathode Driver circuit keeps the applied CRT cathode voltage constant. It does this by maintaining a constant current flow through its network. 6. Horizontal Deflection The Horizontal Deflection circuit generates an output signal that powers the CRT and deflects the CRT beam horizontally across the display screen.
THEORY OF OPERATION b. Beam Shaping A capacitor in the horizontal output driver network blocks the dc current through the horizontal yoke and provides S-shaping of the current wave form. S-shaping compensates for stretch at the left and right sides of the CRT. This stretch is caused by the curvature of the CRT and the failure of the beam to follow that arc. c.
THEORY OF OPERATION beam does not move straight up; it moves from side-to-side during its upward swing. This is caused by the horizontal lines being traced out during vertical retrace. b. Controls Refer to paragraph 1 in this Section of the Service Manual for a functional description of the vertical controls (CENTER and HEIGHT) that are used to properly size and align (vertically) the CRT video display.
THEORY OF OPERATION 9. COS4 Exposure Correction The COS4 Exposure Correction circuit adjust and controls the radial luminance of the CRT video display. This circuit, in conjunction with the Luminance circuit, increases the brightness of the CRT video display to prevent light fall-off in the corners. It provides a more even exposure in the finished print/slide - no dark corners.
THEORY OF OPERATION F. Computer Interface The Digital Palette is designed to operate in the IBM PC, Apple Macintosh (MAC-II), and UNIX based engineering workstation operating environments. It is connected to a host computer via a standard Centronics parallel interface, or optionally by a small system computer interface (SCSI). 1. Centronics Interface The Centronics Interface is an industry standard interface defined by the American National Standards Institute (ANSI).
THEORY OF OPERATION Table 2-13. Control Lines for Bi-Directional Octal Latch Control Line Function CPDIR This control line indicates whether the port is configured as an input or output port. When this signal is LOW, the port is an input port (host to the Digital Palette). CPDIR is a latch control bit from the octal address/data latch. It is controlled by microprocessor address/data bit 14 (AD14). /DATAG This control line is the data enable line.
THEORY OF OPERATION de-assert the /CPBSY line. Also, the assertion of /CPACK and the associated de-assertion of /CPBSY indicate to the host computer that the data has been accepted. If, at any time, the control code senses an error, it can assert either the ERROR line (/CPERR) or the paper end line (CPPE). a.
THEORY OF OPERATION o Isolation (buffer) between the host computer and the Digital Palette to prevent signals internal to the Digital Palette from feeding back to the host computer. The interface network also cleans the data signals from the host computer (inhibits any noise riding on the data signals from being applied to the Digital Palette internal circuitry).
THEORY OF OPERATION Table 2-14. Centronics Interface I/O Signal Lines (Con't) Pin # Name 12 PE Function This signal line transmits hardware error data from the Digital Palette to the host computer. Under normal operating conditions, this signal line is not asserted. If the Digital Palette experiences, a hardware malfunction (filter jam, out of film, film previously exposed, etc.), both the PE and ERROR signals lines are asserted.
THEORY OF OPERATION 2. Small System Computer Interface The Small System Computer Interface (SCSI - commonly pronounced “SKUH-zee”) is an industry standard interface defined by the American National Standards Institute (ANSI). This interface is an optional parallel communication port that provides high speed data communication link between the host computer and the Digital Palette. This optional interface (Figure 2-11) consist of a host interface cable and a SCSI Board.
THEORY OF OPERATION The SCSI Interface Board in conjunction with the host interface cable provides the following: o Buffers and preprocesses the transmitted data from the host computer. o Internal queue for handling SCSI commands as they arereceived from the host computer or the Digital Palette. Some of the received commands get queued and some get executed immediately. o Validates all commands for parameter errors.
THEORY OF OPERATION Table 2-15. SCSI Interface I/O Signal Lines Pin # Name Mnemonic Function 26 - 34 Data DB0-DB7, DBP Upon command, the data asserted by the host computer is transmitted via these I/O Data signal lines to the SCSI bus. The internal CPU on the SCSI transfers the data on the SCSI bus to the Digital Palette for processing. 41 Attention ATN This control line transmits the ATN signal from the SCSI Board to the host computer.
THEORY OF OPERATION Table 2-15. SCSI Interface I/O Signal Lines (Con’t) Pin # Name Mnemonic 45 Reset RST Function This control line transmits the RST signal from the host computer to the SCSI Board. The SCSI Board responds to the Reset condition by terminating any data on the SCSI bus. pletely transmitted will be No conditions of the Digital Palette are affected - (Parameter settings are not affected. Any prior exposure which was completely transmitted will be properly exposed.
THEORY OF OPERATION G. System Diagrams and Schematics The system diagrams and schematics that are referenced during the functional description of the Digital Palette hardware are: 1. Digital Palette Simplified Block Diagram (Figure 2-7) 2. System Interconnection Wiring Diagram 3. Logic Controller P.C.
THEORY OF OPERATION Power Supply Module Power Receptacle Power ON/OF Switch Camera Back SCSI Interface Logic Controller Filter wheel Position Sensor (Photo Interrupter) Centronics Interface Power On/Exposure LED Filter Wheel Stepper Motor Auto Luminance Photodiode Socket Yoke H.V. Transformer (Flyback) CRT Monitor P.C. Board Figure 2-7.
THEORY OF OPERATION 2-81
THEORY OF OPERATION 2-82
THEORY OF OPERATION 2-83
THEORY OF OPERATION 2-84
THEORY OF OPERATION 2-85
THEORY OF OPERATION 2-86
THEORY OF OPERATION 2-87
THEORY OF OPERATION 2-88
THEORY OF OPERATION 2-89
THEORY OF OPERATION 2-90
TROUBLESHOOTING 3. Troubleshooting TABLE OF CONTENTS A. Introduction.................................................................. 3-3 B. Diagnostics Software/Hardware Procedure.................. 3-4 C. Digital Palette Gentest Procedures ............................... 3-6 D. Troubleshooting Charts ................................................
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TROUBLESHOOTING A. Introduction The troubleshooting section of this manual contains information designed to help you isolate potential problems in the Polaroid CI3000/CI5000 Digital Palette Image Recorder. The first section is a brief explanation of Diagnostics, a software tool used in troubleshooting the Digital Palette. The second section is a brief description of Gentest, a software tool used in troubleshooting and image alignment.
TROUBLESHOOTING B: Diagnostic Software / Hardware Procedure Objective: This procedure is intended to describe the use and function of Diagnostic software and hardware. The diagnostic program which runs on the host computer, sends ASCII commands to the monitor to perform the specific tests. The bulk of the diagnostic tests actually reside in the monitor program on the logic board. Typing "DP2DIAG” initiates the tests and reports the results of each test.
TROUBLESHOOTING Command Line Arguments Examples: DP2DIAG 1 - run all of the diagnostics; test connectors are installed; parallel port 1 is connected to the logic board. DP2DIAG 1 10 - run all of the diagnostics ten times before pausing; test connectors are installed; parallel port 1 is connected to the logic board. DP2DIAG 1 20 1 - run diagnostic tests which do not require the test connectors twenty times before pausing; parallel port 1 is connected to the logic board.
TROUBLESHOOTING C: Digital Palette Gentest Digital Palette Gentest is a menu driven software tool that allows alignment and calibration of the Digital Palette System. To use Gentest you will need the following tools: Description Tool # Digital Palette Gentest Software IBM-XT or IBM-AT or compatible (IBM-AT is perferred) 13437 To initiate Gentest from the diskette, type "DPALETTE", This will initiate a batch file that will set the environment for Gentest.
TROUBLESHOOTING The following is a description of each of the selections on the menu of Gentest: View Image File - allows user to select and display Gentest Images on Digitial Palette CRT for alignment purposes. (Refer to Page 5-7 for complete procedures). Expose Gentest Image - allows user to expose availiable Gentest Images. Expose Targa Image - allows you to expose available Targa Images. Reverse Video On - reverses current image displayed, i.e.
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TROUBLESHOOTING D.
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TROUBLESHOOTING Chart 1 No Power / No LED Line Cord OK? Yes Check Power Supply Fuse F1 OK? Yes ON/OFF Switch OK? Yes Yes TP12 TP13 TP14 TP15 Yes Check Wiring & Connectors Replace Power Supply (GRND) +5vDC +12vDC -12v DC No Diagnostics OK? Yes Repair or Replace No Check Logic Board Test Points: No Check Wiring & Connectors Replace Logic board 3-11 Replace After Checking Incoming AC Power Replace Fuse F1 No Check Power Supply Voltages on Connectors J3, J4, J5 Pin 1 -12v Pin2 +12v Pin3 (
TROUBLESHOOTING Chart 2 SOS on Front Panel: LED or Unit Does Not Boot Up Check Logic Board Test Points TP12 (GRND) TP13 + 5vdc TP14 +12vdc TP15 - 12vdc Yes No Run Diagnostics To Verify Logic Board Failure Check Wiring & Connectors - OK? Yes Replace Logic Board Replace Power Supply 3-12 No Repair or Replace
TROUBLESHOOTING Chart 3 Palette Works OK But No LED Check J7 Pin 1 to 2 5 vdc? Yes Replace LED No Check Power Supply Voltages on Connectors J3, J4, J5 Pin 1 -12v Pin2 +12v Pin3 (GRND) Pin4 +5v (vcc) Yes Check Logic Board Test Points: TP12 TP13 TP14 TP15 Diagnostics OK? Yes Check Wiring & Connector Check Power Supply Fuse F1 OK? (GRND) +5vDC +12vDC -12v DC Yes No Yes No No Check Wiring & Connectors No Replace Logic Board 3-13 Replace Power Supply Replace F1
TROUBLESHOOTING Chart 4 Filter Wheel Indexes Intermittently/ Does Not Function Diagnostics OK? Yes Replace Stepper Motor Assembly 3-14 No Replace Logic Board
TROUBLESHOOTING Chart 5 35MM Camera Will Not Function (Camera OK) Is Fuse F1 On Logic Board Open? Yes Replace Fuse F1 No Check Power Supply Voltages on Connectors J3, J4, J5 Pin 1 -12v Pin2 +12v Pin3 (GRND) Pin4 +5v (vcc) Yes Check Logic Board Test Points: TP12 TP13 TP14 TP15 Yes Diagnostics OK? Yes Check Wiring & Connector (GRND) +5vDC +12vDC -12v DC No Check Power Supply Fuse F1 OK? Yes No No Check Wiring & Connectors No Replace Logic Board 3-15 Replace Power Supply Replace F1
TROUBLESHOOTING Chart 6 Unable to Control Brightness by Using Function Keys on Host Computer While in GENTEST (Autoluma ADT Procedure) Run Diagnostics To Verify Logic Board Function Yes Check PhotoCell on Front Housing - Does it Function? Yes No Replace Logic Board No Replace Monitor Board Assembly Replace PhotoCell 3-16
TROUBLESHOOTING Chart 7 CRT Filament Not Lit Turn Off Power Unplug CRT Socket Use VOM to Check Continuity Between Pins3 & 4 of CRT Continuity? Yes No Plug In CRT Socket and Turn On Power Replace CRT Assembly (Depot Repair Only) Use VOM to Check Voltage Across E2 and E3 12 vdc + 0.
TROUBLESHOOTING Chart 8 GENTEST - FULL WHITE SCREEN No Video on CRT Check Input Voltage on P9 Pin 15 + 12V Pin 1 + 12 V Yes Check E1 Yellow Wire on Monitor Board For Video Signal Yes No Replace Monitor Board Assembly Check Power Supply & Wiring Check Base of Q3 on Monitor board for Video Signal Check U1 Pin 1 for Horizontal Signal Yes No No Yes Replace Monitor Board Assembly Run Diagnostics to Verify Logic Board Failure No Run Diagnostics to Verify Logic Board Failure Replace Monitor Board Ass
TROUBLESHOOTING Chart 9 Picture Has Dark Corners on Top or Bottom Follow HCOS VCOS Adjustment Procedure in Manual Run Diagnostics to Verify Logic Board Function Yes No Replace Monitor Assembly Replace Logic Board 3-19
TROUBLESHOOTING Chart 10 No Video, or Lines in Video Thru White Field.
PARTS REPLACEMENT 4. Parts Replacement TABLE OF CONTENTS Page 4-3 Introduction Special Equipment Required 4-5 A. Replacing the Front Housing Assembly 4-6 B. Replacing the LED 4-8 C. Replacing the filter Wheel Assembly 4-10 D. Replacing the Wheel Position Sensor 4-12 E. Replacing the CRT 4-14 F. 4-17 Replacing the CRT Mounting Fixture G. Replacing the Stepper Motor 4-20 H. Replacing the Monitor Board Assembly 4-22 I. 4-25 Replacing the Power Board Assembly J.
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PARTS REPLACEMENT INTRODUCTION Follow these procedures to replace Digital Palette parts that are identified as defective during troubleshooting. In many cases, the unit will have to undergo calibration or adjustment after a part or assembly is replaced. Where noted, the calibration/adjustment called for is critical to Digital Palette operation after the new part is replaced. All calibration and adjustment procedures are described in section 5 of this manual.
PARTS REPLACEMENT Figure 4-1 Replacement Parts 4-4
PARTS REPLACEMENT SPECIAL EQUIPMENT REQUIRED Presented below is a list of equipment needed for the required calibration and adjustment of the Digital Palette, when the following parts are replaced: CRT, CRT Mounting Fixture, Stepper Motor, Monitor Board Assembly, or Logic Board Assembly.
PARTS REPLACEMENT A. REPLACING THE FRONT HOUSING ASSEMBLY 1. REMOVAL: (Figure 4-2) a. Disconnect AC power from the system. b. Remove the six screws and washers holding the Cover to the bottom of the chassis. Slide the Cover to the rear and lift it off. c. Pull the LED indicator and cable out of its retainer by grasping the cable with pliers and using the chassis edge as a fulcrum (see Figure 4-2 ) d.
PARTS REPLACEMENT Figure 4-2 Cover and Front Housing Removal 4-7
PARTS REPLACEMENT B. REPLACING THE LED 1. REMOVAL: (Figure 4-3) a. Disconnect AC power from the system. b. Remove the six screws and washers holding the Cover to the bottom of the chassis. Slide the Cover to the rear and lift it off (Figure 4-2). c. Using needlenose pliers, firmly grasp the LED wire leads. Using the chassis edge as a fulcrum, lever the LED out of its retainer. d. Unplug the LED cable connector from the Logic Board Assembly. e. Remove the LED, cable, and connector. 2.
PARTS REPLACEMENT Figure 4-3 LED Replacement 4-9
PARTS REPLACEMENT C. REPLACING THE FILTER WHEEL ASSEMBLY 1. REMOVAL: (Figure 4-4) a. Disconnect AC power from the system. b. Remove the six screws and washers holding the Cover to the bottom of the chassis (Figure 4-2). Slide the Cover to the rear and lift it off. c. Remove the four screws holding the Front Housing Assembly to the chassis (Figure 4-2). Remove the Front Housing. d. Remove the Filter Wheel Retaining Ring from the pivot shaft. e.
PARTS REPLACEMENT Figure 4-4 Filter Wheel Assembly Replacement 4-11
PARTS REPLACEMENT D. REPLACING THE WHEEL POSITION SENSOR 1. REMOVAL: (Figure 4-5) a. Disconnect AC power from the system. b. Remove the six screws and washers holding the Cover to the bottom of the chassis (Figure 4-2). Slide the Cover to the rear and lift it off. c. Unplug the sensor cable from the Logic Board Assembly. d. Remove and save the two screws holding the Wheel Position Sensor to the chassis. e. Remove the Sensor, cable, and connector. 2. INSTALLATION: a.
PARTS REPLACEMENT Figure 4-5 Wheel Position Sensor Replacement 4-13
PARTS REPLACEMENT E. REPLACING THE CRT Note: CRT replacement is to be performed at depot facilities only. 1.
PARTS REPLACEMENT Figure 4-6 CRT Replacement 4-15
PARTS REPLACEMENT h. Unplug the ground lead from P5 on the Monitor Board Assembly. i. Loosen the CRT clamp screws far enough to release the CRT, then gently pull the CRT back and out of the CRT mounting fixture. 2. INSTALLATION: WARNING: Be sure the AC power cord is unplugged. a Plug the CRT ground lead connector into the Monitor Board Assembly at P5. b. Reconnect the vertical and horizontal deflection connectors to J3 and J4, respectively, on the Monitor Board. c.
PARTS REPLACEMENT F. REPLACING THE CRT MOUNTING FIXTURE Note: CRT Mounting Fixture Replacement is to be done at depot facilities only. 1.
PARTS REPLACEMENT 3. INSTALLATION: a. Remove the two CRT clamps (Figure 4-6) from the old CRT Mounting Fixture and install them on the new Fixture. b. Press the Mounting Fixture onto the front of the CRT (Figure 4-6) and tighten the clamp screws. Note: Press firmly on the CRT when inserting it into the Fixture, making sure that it seats properly. c. Insert the original shims between the Fixture and the chassis. Secure the Fixture to the chassis with the four screws.
PARTS REPLACEMENT Figure 4-7 CRT Mounting Fixture Replacement 4-19
PARTS REPLACEMENT G. REPLACING THE STEPPER MOTOR Note: Stepper Motor Replacement is to be done at depot facilities only. 1.
PARTS REPLACEMENT f. Unhook the spring from the Stepper Motor remove the retaining ring from the pivot pin, and slide the Motor out. g. Unplug the Stepper Motor cable from the Logic Board Assembly, then remove the motor and cable. 3. INSTALLATION: a. Install the Motor in the chassis and replace the retaining reing on the pivot shaft. Be sure the Motor drive roller rests on the outside of the Filter Wheel rim. b. Plug the Stepper Motor cable into P6 on the Logic Board. c.
PARTS REPLACEMENT H. REPLACING THE MONITOR BOARD ASSEMBLY Note: Monitor Board Replacement is to be done onloy at depot facilities. 1.
PARTS REPLACEMENT h. Disconnect the CRT anode cap by lifting its flange with your fingers and depressing one contact with a greenstick to release it from the socket (see inset, Figure 4-6). i. Unplug the vertical and horizontal deflection cable connectors from the Monitor Board Assembly (Figure 4-6). j. Unplug the CRT ground lead from P5 on the monitor Board (Figure 4-6). k.
PARTS REPLACEMENT j. Perform the Calibration and Adjustment procedures described in Section 5. WARNING: Since power is ON, use extreme caution to prevent electrical shock. k. Replace the Cover using the six screws (Figure 4-2).
PARTS REPLACEMENT I. REPLACING THE POWER SUPPLY BOARD ASSEMBLY 1. REMOVAL: (Figure 4-9) a. Disconnect AC power from the system. b. Remove the six screws and washers holding the Cover to the bottom of the chassis (Figure 4-2). Slide the cover to the rear and off the chassis. c. Disconnect the chassis-ground cable. d. Disconnect the power switch cable connector. e. Unplug the three lines that bring power to the Logic Board. f. Remove the four screws securing the Power Supply Board to the chassis.
PARTS REPLACEMENT Figure 4-9 Power Supply Board Assembly Replacement 4-26
PARTS REPLACEMENT J. REPLACING THE LOGIC BOARD ASSEMBLY Note: Logic Board Replacement is to be done only at depot facilities. 1.
PARTS REPLACEMENT h. Remove the eight screws securing the Logic Board Assembly to the chassis. i. Gently slide the Logic Board Assembly out of the chassis. Use care to prevent damaging the components or circuit etching. 3. INSTALLATION: a. Install the new Logic Board Assembly from the rear. CAUTION: Use extreme care to avoid striking or scraping the board components against chassis components when positioning the Logic Board in the chassis. b. Secure the Back Plate with the four screws. c.
PARTS REPLACEMENT Figure 4-10 Logic Board Assembly Replacement 4-29
PARTS REPLACEMENT K. REPLACING THE LINE FILTER ASSEMBLY 1. REMOVAL: (Figure 4-10) a. Disconnect AC power from the system. b. Remove the six screws and washers holding the Cover to the bottom of the chassis (Figure 4-2). Slide the Cover to the rear and off the chassis. c. Disconnect the two Power Switch leands and unsolder the green ground wire from the Line Filter Assembly. d. Drill out the pop rivets holding the Line Filter Assembly to the Rear Cover; remove the assembly. 2.
PARTS REPLACEMENT L. REPLACING THE POWER SWITCH 1. REMOVAL: (Figure 4-11) a. Disconnect AC power from the system. b. Remove the six screws and washers holding the Cover to the bottom of the chassis (Figure 4-2). Slide the Cover to the rear and off the chassis. c. The Control Panel is secured to the chassis by two posts and retainers. Rotate the retainers 1/4 turn and lift them off the posts. Remove the Contro Panel. d. Disconnect the leads from the AC Line Filter cable and the power supply cable.
PARTS REPLACEMENT Figure 4-11 Power Switch Replacement 4-32
PARTS REPLACEMENT M. REPLACING THE REMOTE CAMERA CONNECTOR 1. REMOVAL: (Figure 4-11) a. Using a flat screwdriver, push against the two detents securing the Remote Camera Connector to the chassis. b. Unplug the Remote Camera cable from the Logic Board. c. Gently pull the Remote Camera Connector out through the opening in the Control Panel and chassis. 2. INSTALLATION: Perform steps a. - c. above in reverse order.
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CALIBRATION & ADJUSTMENTS Table of Contents A. Electrical/Final Assembly Alignment of the CRT . . . . . . . . . . . . . 5-3 Adjusts the system so that the CRT image is the proper size and is properly aligned vertically and horizontally. B. Autoluminant Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9 Adjusts the system to bring screen brightness within specification C. COS4 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CALIBRATION & ADJUSTMENTS This section includes a series of tests which should be performed whenever a Digital Palette Film Recording system is suspected of having alignment or collimation problems. They should also be performed following repairs which may have affected alignment or collimation. Important As you service this product for alignment and collimation problems, make sure that you follow the procedures (A through H) in sequence.
CALIBRATION & ADJUSTMENTS A. Electrical/Final Assembly Alignment of the CRT This procedure must be performed whenever the Monitor Board is replaced or disturbed. Equipment Needed: Video Photometer Oscilloscope K42769 Edmonds Scientific 6X Loupe 12979 Final Assembly Alignment Gauge 12994 108 Adapter Collimation Master Digital Palette Gentest Diskette Host Computer Setup: 1. Disconnect power. 2. Remove the cover from the Digital Palette system. 3.
CALIBRATION & ADJUSTMENTS Figure 5-1. Electrical/Final Assembly Alignment of the CRT Procedure: Warning Most of the following steps must be done with the power on. Use extreme caution to prevent electrical shock. 1. Turn the power on. 2. Load the Gentest program and a full white screen will appear on the CRT. 3. Adjust R46 course brightness (Figure 5-2) to a level that’s easily visible to the eye-approximately 6 ft. Lamberts. 4. Bring up the “tennis court” pattern by selecting DP.
CALIBRATION & ADJUSTMENTS Figure 5-2. Adjustment Locations 5. View the displayed image on the Final Assembly Alignment gauge (#12579) using the 6X loupe (#K42769). Note When you look through the loupe, make sure the two scribed lines on the gauge are always visible. This will eliminate the possibility of having parallax problems.
CALIBRATION & ADJUSTMENTS 6. Visually inspect the “tennis court” to make sure it’s properly centered horizontally and vertically. Make sure the image is not tilted. 7. If the image is tilted, remove the 108 Adapter Collimation Master (#12994) and Final Assembly Alignment Gauge (#12979) loosen the bracket on the CRT tube, then turn the yoke to square the image with the face of the CRT (Figure 5-3). Figure 5-3. Centering Rings 8.
CALIBRATION & ADJUSTMENTS Figure 5-4. Offset Measurement and Calculation Vertical Offset Measurement and Calculation: 1. Measure V5 and V6 2. Subtract the smaller value from the larger value. 3. Divide the difference by 2 to obtain Vertical Offset. Horizontal Offset Measurement and Calculation: 1. Measure H5 and H6 2. Subtract the smaller value from the larger value 3. Divide the difference by 2 to obtain Horizontal Offset. See Digital Palette specifications for allowable Vertical and Horizontal Offset.
CALIBRATION & ADJUSTMENTS IF THE ABOVE CONDITIONS ARE NOT MET, FOLLOW THESE STEPS: 1. Cut the hot melt securing the two centering rings on the yoke of the CRT (Figure 5-3). 2. Return the Vertical Centering pot (R27) and the Horizontal Centering pot (R7) - Figure 5-2, to their nominal (center) positions. 3. Adjust the centering rings to obtain proper Vertical and Horizontal Centering. When centering is O.K., re-secure the centering rings using a hot glue gun. 4.
CALIBRATION & ADJUSTMENTS B. Autoluminant Adjustment Always do the Autoluminant Adjustment whenever the Logic Board and/or the Monitor Board is replaced. Equipment Needed: Video Photometer Digital Palette Gentest Diskette Host Computer Setup: Turn the Digital Palette system ON and allow it to warm up for a minimum of 15 minutes. To prevent ambient light from affecting the readings, make sure the Digital Palette is covered during these adjustments.
CALIBRATION & ADJUSTMENTS Figure 5-5. Autoluminant Adjustment 6. To End Dark Current Adjust, press F1 and it defaults to AUTOLUMA. 7. Install the Photometer, turn it on, and set it to the 0-20 ft. Lamberts range. 8. Adjust the brightness to 7.5 ft. Lamberts on the Multimeter - using Luma Adjust pots R46 (course) and R47 (fine) - Figure 5-2. 9. Using the F keys, regulate the COURSE and FINE ADJUST to change the Luminant to 6.0 ft. Lamberts on the Multimeter. 10.
CALIBRATION & ADJUSTMENTS C. COS4 Adjustment Always make this adjustment whenever the Monitor Board and/or the Logic Board is replaced. Equipment Needed: Oscilloscope Digital Palette Gentest Diskette Host Computer Procedure: (Refer to Figure 5-6) The objective is to set Horizontal (R38) (Figure 5-2) for 600 millivolts which is measured at E4 (green wire at CRT cap), and to set Vertical (R26) (Figure 5-2) for 300 millivolts using Gentest. Figure 5-6.
CALIBRATION & ADJUSTMENTS IMPORTANT Before continuing, be sure to escape from Gentest after completing Autoluminant Adjustment. 1. Place the Probe Ground on the pin side of the Flyback Shield. 2. Attach the Probe to E4 on the Monitor Board (green wire from CRT cap). 3. Attach the External Input Triggering Probe to J3, Pin 1 (brown wire at Yoke). 4. To obtain the proper signal, first adjust the oscilloscope to 20 microseconds at 100 MV/Division and then set Horizontal (R38) for 600 Millivolts (.
CALIBRATION & ADJUSTMENTS D. Electrical Focus Adjustment Done at depot facilities only. Equipment Needed: CRT Collimation Master 12991 Digital Palette Gentest Diskette Host Computer Setup: Bring up the “tennis court” pattern by selecting DP.GTI from the Gentest menu. Precedure: 1. Install the CRT Collimator on the Digital Palette using the thumbscrews to secure it. Refer to Digital Palette Collimation procedure (Figure 5-10). 2.
CALIBRATION & ADJUSTMENTS E. Digital Palette CRT Collimation Done at depot facilities only. Equipment Needed: CRT Collimation Master CRT Collimator 12991 12992 Digital Palette Gentest Diskette Host Computer Setup: 1. Bring up the “tennis court” pattern be selecting DP.GTI from the Gentest menu. 2. Install the CRT Collimator #12992 on the CRT Collimation Master #12991, using the thumbscrews to secure the two assemblies (Figure 5-9). Figure 5-9.
CALIBRATION & ADJUSTMENTS Procedure: 1. Turn the focus wheel on the Collimator while looking through the collimator eye piece. Focus the collimator until the sharpest image is seen in the eyepiece. Do this several times to be ccertain that the sharpest image possible is obtained. This should be repeatable to within .002 inch as noted on the collimator dial. 2. When the sharpest image is obtained, set the dial on the collimator to zero. 3. Remove the CRT Collimator from the CRT Collimation Master.
CALIBRATION & ADJUSTMENTS 5. Turn the focus wheel on the collimator while looking through the collimator eyepiece. Look in the eypiece and focus the collimator until the phosphors on the screen are the sharpest possible. Look at the center cross pattern. 6. When the sharpest image is obtained, look at the dial on the collimator. The dial will indicate in 1000ths of an inch, the amount of shimming needed, if any, between the CRT mount and the front housing of the Digital Palette.
CALIBRATION & ADJUSTMENTS 8. Obtain the proper size shims and cut them as shown in Figure 5-11. This will allow them to be pushed under the mount without having to completely remove the screws. 9. When the proper shims have been installed, retighten the screws securing the mount to the front housing. 10. After shimming, do the Final Assembly Alignment procedure again and then repeat this entire procedure from the start.
CALIBRATION & ADJUSTMENTS F. Taking a Test Picture Equipment: Pack Film Back and Pack film Digital Palette Gentest Diskette Host Computer Procedure: 1. Select EXPOSE GENTEST IMAGE from the Main Menu. 2. Scroll down the Gentest Image Menu and select DP.GTI. 3. Enter the Digital Palette serial number and hit ENTER. 4. You are instructed to PREPARE CAMERA FOR EXPOSURE. This means pull out the dark slide. 5. Hit ENTER and Exposure Sequence begins. The LED will blink during exposure.
CALIBRATION & ADJUSTMENTS G. 35MM Collimation Done only at depot facilities Equipment Needed: 1-150 Light Source C-1300 Null Meter 12993 Camera back Collimtor (Includes dial gauge assembly) 12988 35mm Collimation Adapter 12996 35mm Fiber Optics Locator Assembly 12995 35mm Adapter Collimation Master 12974 35mm Lens Adjust Wrench Setup: (Refer to Figure 5-12) 1. Install the Dial Gauge Assembly on the Camera Back Collimator #12993. Be certain that the gauge assembly is set at the 35mm position.
CALIBRATION & ADJUSTMENTS Figure 5-12. Dial Gauge Assembly Procedure: 1. First turn on the Light Source and the Null Meter. Note Set the Light Source to the lowest intensity possible in order to preserve the lamps.
CALIBRATION & ADJUSTMENTS Before performing the following step, make sure the plunger on the dial gauge is no more than 1/4 inch from the end of the tube as shown in the inset of Figure 5-12. 2. While observing the Null Meter, turn the focus wheel on the Dial Gauge Assembly. There is a point where the needle starts to rise and then drops back to the lower value before starting to rise again. The lowest value after the first rise is called the Null Point (Figure 5-13). Figure 5-13. Null Point 3.
CALIBRATION & ADJUSTMENTS 7. Install the 35mm Lens Assembly, that you are testing, onto the Collimation Adapter in place of the master. 8. Carefully turn the focus wheel on the Dial Gauge Assembly while observin the Null Meter. Stop when you reach the Null Point. 9. Check the dial on the Dial Gauge Assembly. If the dial reading is with +/- .015 from zero, the lens assembly is in collimation. When the Dial Gauge Assembly indicates a reading that exceeds +/- .
CALIBRATION & ADJUSTMENTS H. 108 COLLIMATION Done only at depot facilities. Equipment Needed: 1-150 Light Source C-13000 Null Meter 12993 Camera Back Collimator (Includes Dial Gauge Assembly) 12994 108 Adapter Collimation Master 12974 108 Lens Adjust Wrench Setup: (Refer to Figure 5-14) Figure 5-14.
CALIBRATION & ADJUSTMENTS 1. Install the Dial Gauge Assembly on the Camera Back Collimator #12993. Make sure the Gauge Assembly is set at the 108 position. 2. Install the 108 Adaper Collimation Master #12994 on the Camera Back Collimator. Make sure the master is firmly attached to the collimator. 3. Connect the fiber optics to the Light Source #1-150 and the Null Meter #C-13000. Secure the fibers using the setscrews on the connectors.
CALIBRATION & ADJUSTMENTS 9. If the Dial Gauge Assembly indicates a reading of more than +/- .015 from zero, the lens must be collimated as follows: a. If the reading is higher than + .015 from zero, turn the lens clockwise using the 108 Lens Adjust Wrench #12974. If the reading is lower than - .015 from zero, turn the lens counterclockwise using the 108 Lens Adjust Wrench. b. With each lens adjustment, re-establish the Null Point and recheck the dial reading. c.
CALIBRATION & ADJUSTMENTS I. Dual Autoluma Rework The following rework procedure eliminates calibration error due to CRT drift. The rework includes changing the firmware (EPROMs U8 and U9) on the logic board and the addition of two resistors on the monitor board. The procedure also requires standard calibration equipment (refer to the beginning of this section) and the additional material listed below. To perform the rework, use the steps below.
CALIBRATION & ADJUSTMENTS 10. To end dark current, press F1 (it defaults to AUTOLUMA). 11. Install the photometer and adjust Brightness Pots until the meter reads 6.0 ft-lamberts. Adjust Autoluma pot VR1 on Logic board until Autoluminant reads 200 on Gentest menu. 12. Press F7 and verify that brightness reads greater than 8.00 ft-lamberts. 13. Press F3 to verify calibration. 14. Verify image alignment according to the procedure at the beginning of this chapter.
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