Xerox 1235/DX Service Guide - Page 61
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Printing and print quality problems Required tools s #1 Phillips screwdriver s Volt-ohm-meter (VOM) s Conductive grease s Ruler Light or blurred images 1. Is the correct paper being used in the printer? 2. Are the toner cartridges low? 3. Are any of the imaging drum reaching their end-of-life? Replace them if they are. 4. Do the imaging drum units make good connection to their power terminals? 5. Are the LED heads dirty? Clean each head with an alcohol-soaked, lint-free cloth. 6. Are the LED heads wiring harnesses undamaged and properly seated? 7. Is +3.8V (red wire) supplied to Pin 3 of each LED head assembly? If yes, replace the LED head assembly. 8. Is +3.8 V supplied to the POWER connector pins 1, 2, 3, 4, 5, 6, 7 and 8 on the junction board or at the 16-pin interconnect near the top cover hinge (under the top shield plate). Inspect the junction board's wiring connectors. If the voltage is not OK, replace the low-voltage power supply. 9. If +32 volts supplied to the POWER connector pins 7, 8, 9 and 10 on the engine controller board? Inspect the wiring harnesses or replace the low-voltage power supply. 10. Is +32V supplied to the HVOLT connector Pin 5 of the engine board. If not replace the engine board. (Transfer the old engine controller board's EEPROM (lower-right corner of board) to the new engine controller board.) 11. Inspect the high-voltage wiring harnesses. 12. Replace the high-voltage power supply. 48 Phaser 1235 Network Color Printer