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Xerox XL-795D Service Manual

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XL795D
Service Manual

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  Summary of Contents for Xerox XL-795D

  • Page 1 XL795D Service Manual...
  • Page 2 TABLE OF CONTENTS S E R V I C E W A R N I N G ¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡ A. I M P O R T A N T S A F E T Y I N S T R U C T I O N ¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P¡P B.
  • Page 3: Important Safety Instruction

    To prevent from fire or shock hazard,do not expose monitor to any rain or any form of water.High voltage is inside the monitor so please do not remove the back cover of the cabinet if you are not a qualified monitor engineer.Contact the local dealer or the nearest Xerox branch office if you need help. A. IMPORTANT SAFETY INSTRUCTION Prior to using this service manual,please ensure that you have carefully followed all the procedures outlined in the user's manual for this product.
  • Page 4: Specifications

    B. SPECIFICATIONS 1. Maximum Resolution 1280 x 1024 @ 75Hz 2. Recommend Resolution 1280 x 1024 @ 60Hz 3. Synchronization Range Horizontal 31 – 80 KHz Vertical 60– 75 Hz 4. Active Display Area 376mm (H) x 301mm (V) 5. Dot Pitch 0.294(H) x 0.294(V) mm 6.
  • Page 5 C.TIMING CHART Video Back porch Active display Front porch Sync. Sync-width Total VESA VESA VESA VESA VESA Preset Modes 720X400 640X480 640X480 640X480 800X600 800X600 800X600 Pixel clock 28.325 25.175 31.500 31.500 36.000 40.000 50.000 (MHz) 31.472 31.469 37.861 37.500 35.156 37.879 48.077...
  • Page 6 VESA VESA VESA VESA VESA VESA Preset Modes 800X600 1024X768 1024X768 1024X768 1280X1024 1280X1024 Pixel clock 49.500 65.000 75.000 78.750 108.00 135.00 (MHz) 46.875 48.363 56.476 60.023 63.981 79.976 H-Frequency (KHz) 21.333 20.677 17.707 16.660 15.630 12.540 H-Total (µs) 16.162 15.754 13.563 13.003...
  • Page 7: Control Location

    D. CONTROL LOCATION Font control panel 1. Menu button (MENU) 4. Auto button (AUTO) 2. Select button (DOWN) 5. Power button (POWER) 3. Select button (UP) 6. Power Indicator Rear panel The rear panel of the monitor includes 3 plug-in connectors. They are as follows: 1.
  • Page 8: Conduction View

    E. CONDUCTION VIEW MAIN BOARD (Component Side)
  • Page 9: Main Board (Component Side)

    MAIN BOARD (Component Side)
  • Page 11: Adjustment Procedure

    F. ADJUSTMENT PROCEDURE ¡Ì Test Meter Check ITEM ¡Î Test Point Operation Value Program Menu. ¢N Pattern ¡Ì Digital Voltmeter 1. Plug power cable into the adapter, check adapter 12.0V Check power indicator light up green. ±0.2V ¡Î CN7 2. Make sure the voltage of the power plug ( ¢N Crosshatch Pattern on the main to the value shown at right.
  • Page 12: Troubleshooting Hints

    G. TROUBLE SHOOTING HINTS No Display ( Black ) Change Power LED ON adapter adapter ? Push the power switch ON/OFF LED Color Back light To Step 2 change ? Check main board Check Scaler IC the Inverter High Voltage ! Make sure the Hi / Lo under +12V ?
  • Page 13 Check the connection of Change the Hi / Lo under control board push power sw? main board Display ? Change the Inverter OK ! Display ? OK ! Change the main board To Step 2...
  • Page 14 Step 2 Check the main Check board Fuse, Adapter Repair +5.0 V ? 5V Circuit Check the main Repair board DPMS DPMS Circuit Circuit ? Change H/V input Scaler IC Signal ? Check H/V Signal Change Display ? Signal Cable OK !
  • Page 15 No display (White) Check the main Repair board 5V Circuit Check +3.3V ? 3.3V Regulator Check the main Repair board 3.3V Regulator 3.3V Circuit Change H/V Input Scaler IC Signal ? Check H/V Signal Change Display ? Signal Cable OK !
  • Page 16: Replacement Parts List

    Bar Code Label 110X50MM 002-002-0DOC-A FCC DOC Declaration PROVIEW 002-G50-980DL XEROX Warranty card 005-500-980DL GA980DL XEROX Carton 002-U50-980DL GA-980DL XEROX English user manual 153-500-980DL GA-980DL XEROX Back Label 999-XF0-GA980DL GA980DL XEROX ass’ y Color : 877C+K2440 899-400-GA980DL GA-980DL Control Board Ass’ y 200-701-GA780...
  • Page 17 Parts No. Description Part Location Q’ ty 281-031-20014 SMD R 2K 1% 0603 R87., 281-031-62014 SMD R 6.2K 0603 R86., R154.,R155.,L1.,L2.,L3.,L4.,L5.,L6., 281-035-0R04 SMD R 0 ohm 5% 0603 L7.,R17.,L19.,R5.,R7.,R36.,R71., R75.,R88.,R55.,R13.,R23., 281-035-1014 RES 100 5% 1/10W 0603 R25.,R26.,R27.,R28., 281-035-1024 RES 1K 5% 1/10W 0603 R60.,R61., 281-035-1044 RES 100K 5% 1/10W 0603...
  • Page 18 Parts No. Description Part Location Q’ ty 382-392-032564 SMD CC 0.039uF 25V X7R 0603 C22., 382-393-032564 SMD CC 0.047uF 25V X7R 0603 C23., 382-473-032564 SMD CC 0.047uF 25V X7R 0603 C24.,C25.,C27., C5.,C193.,C194.,C1.,C4.,C8.,C11.,C14., C15.,C16.,C20.,C21.,C30.,C31.,C32., C33.,C34.,C35.,C36.,C37.,C38.,C39., C40.,C41.,C42.,C43.,C44.,C45.,C46.,C47., C48.,C49.,C50.,C51.,C52.,C53.,C54., C55.,C56.,C57.,C58.,C59.,C60.,C62., 385-104-032584 SMD CC 0.1uF 25V Y5V 0603 C63.,C64.,C65.,C66.,C67.,C68.,C69., C70.,C71.,C72.,C73.,C74.,C76.,C77., C78.,C79.,C86.,C92.,C93.,C95.,C96.,...
  • Page 19 GA-980DL CR Bar L Color : 877C 154-501-980DL GA-980DL CR Bar R Color : 877C 154-002-GA580 GA-980DL LED Lens 928-200-980DL GA980DL Glass 2.8t +AG XEROX 540-600-976DA Insulation For Panel back side 540-700-1976 Mylar Film AS/PS976 0.2t 540-600-976DB Insulation Rear Plate inside 154-502-980DL GA-980DL PVC film 0.3t...
  • Page 20 8P1.5 220mm+CORE ¥[ SHIELD+GND 101-010-3012 Screw P3*L10mm TP1 105-008-3012 Screw T3*8mm TP1 831-411-00405 Sponge 11x405.2x2mm 831-411-00323 Sponge 11x323.5x2mm 123-507-976D AL Neck Color : 877C 123-502-976D NECK 151-051-980DL GA-980DL XEROX rear cover 109-950-0950 Screw For D-SUB Connector 109-948-1000 Screw For D-SUB Connector...
  • Page 28: Block Diagram

    I. BLOCK DIAGRAM...
  • Page 29: Schematic Diagram

    J. SCHEMATIC DIAGRAM DAN202K/NC 4/18 change 4.7K VGA_VSYNC 0.1uF R158 4.7K 4/18 Add. 2N3906 PIN4 CN14 10K/NC 24LC21 232E VCLK 4/18 Add. DDC-SCL CN14 DDC-SDA TXD_PC RXD_PC DAN217K(NP) CN14 0.1uF DAN202K/NC 0R(NC) DAN217K(NP) 4/18 0.1uF change DDC-SDA 47/NC 0R(NC) 47/NC VGA_HSYNC PIN4 BAIN...
  • Page 30 3.3VADC 3.3VADC 3.3VADC 3.3VADC 3.3VADC 3.3VADC 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 100(NC) 3.3K DCLK DCLK A[19:1] DCLKNEG TESTEN 3.9nF TESTEN D H S D H S Add C26 DRE[7:0] 39nF DRE0 GFILT 3.3K 3.3K DRE1 FILTER...
  • Page 31 ROMOEn ROMWEn FCEn ROMOEn RESETn ROMWEn RESETn 0.1uF D[15:0] D[15:0] CS0n BYTE 100K 0.1uF 0.1uF AUTO POWER RESETn LEFT RIGHT MENU GND1 10uF/16V_EC4D(NC) GND2 D[15:0] EN29LV800T-90 74LVC541A Input Buffer If use ICE, remove the A[19:1] LED_O R59 33R LED_G LED2 LED1 2N3904 2N3904...
  • Page 32 DRO[7:0] DRO0 DRO1 JSTB30B-PHDSS DRO2 33X4 RXO0- DRO3 CVDD 1-19 RXO0+ DRO4 2-18 DRO5 RXO1- 3-17 DRO6 33X4 RXO1+ 4-16 DRO7 RXO2- 5-15 RXO2+ 6-14 0.1uF 0.1uF 0.1uF 0.1uF 0.1uF 0.01uF RXOC- 8-13 DGO[7:0] RXOC+ 9-12 RXO3- DGO0 10-11 DGO1 RXO3+ 11-10 33X4...
  • Page 33 Choose one package FUS1206-5A BEAD_80R VIN12V L25A BEAD_80R(NC) C100 0.01uF 0.1uF DC-JACK VIN1 BE1206 C101 220uF/16V 4/18 C14 change into C10 33uH@3A BE1206 ISENSE PGATE PWR_GND C102 C103 CEM9435A SO8 C107 C105 C106 C104 MMSZ5248B(NC) C109 0.1uF 0.01uF LM3485 1N5822(DIP) SB340 C108 5.6V...
  • Page 34 C132 10uF/16V C133 M O D E V C C O P V O L VCC_AU Audio GND 33PF R100 M O D E G N D O P M A X BE0805 R102 R103 R104 D E L L 1 5 1K(NC) C134 C135...
  • Page 36 Memu...

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