Xerox 7700DX Service Manual - Page 138
Print Image Quality Problems, Light (undertone) Prints (all colors), Blank Prints
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Print Image Quality Problems Light (undertone) Prints (all colors) The overall image density is too light. 1. Ensure that the correct color correction was set in the driver. 2. Is the correct paper being used in the printer? 3. Ensure that the loaded media matches the front panel settings. 4. Verify the Bias Transfer Roller is not reaching its end-of-life by printing the Supplies Usage Page. 5. Run the Calibrate for Paper routine. From the Front Panel's Support Menu, select Improve Print-Quality? then select Calibrate for Paper Menu and press OK. 6. Cycle the power, which causes an Auto-Density Control Cycle to take place. 7. Replace the Bias Transfer Roller (RRP 17, on page 7-172). 8. Replace the High-voltage Power Supply (RRP 44, on page 7-208). Blank Prints The entire image area is blank. 1. Generate a 100% Solid Fill Test print from the front panel. 2. Is the test print blank? 3. Open the door in the middle of the print job. Is there toner on the print unit and/or Accumulator Belt? 4. Cycle the printer power. 5. Using the Service Diagnostics Test Menu Functions beginning on page 2-35, test the shutter solenoid to ensure it opens and closes correctly. Remove a print cartridge and see the shutter open and close. 6. Inspect the wiring harness for loose or disconnected wiring connectors; check connectors P400 and P401 at the Engine Control Board. 7. Replace the High-voltage Power Supply (RRP 44, on page 7-208). 8. Replace the Image Processor Board (RRP 39, on page 7-202). 9. Replace the Engine Control Board (RRP 42, on page 7-206). 3-108 Phaser 7700 Color Laser Printer Service Manual
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