Xerox 7700DX Service Manual - Page 139
One Color is Faded or Missing, Calibrate for Paper, Support, Improve Print-Quality?
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One Color is Faded or Missing 3041-39 1. Is the Toner Low Message being displayed on the front panel? Under high toner-coverage conditions, toner may be depleted during the toner low state but before the toner out message is displayed. 2. Ensure that the loaded media matches the front panel settings. 3. Run the Calibrate for Paper routine. From the Front Panel's Support Menu, select Improve Print-Quality?, then select Calibrate for Paper Menu. Note Check the transfer setting before running calibrate paper. If the value is -4, you need to adjust the transfer settings. 4. Swap the print unit (of the bad color) with the one next to it. (Print units are not keyed to a particular color.) If the trouble follows the print unit, replace it. 5. Remove the print cartridge and verify that the laser shutter opens and closes using the Service Diagnostics Shutter Solenoid test. 6. Inspect and test the toner auger system. Ensure that the toner auger motor operates. Ensure that the toner dispense assembly is carrying toner from the toner cartridge to the developer. 7. Remove the Accumulator Belt Assembly and inspect the high-voltage knife connectors on the back side to ensure they are not damaged (RRP 35, on page 7-196). 8. Replace the Accumulator Belt Assembly. 9. Inspect the high-voltage wiring leading to the Replace the Accumulator Belt Assembly for damage. 10.Replace the Developer Housing Assembly (RRP 27, on page 7-185). 11.If the missing or faded primary color appears as speckle on the entire page, the high-voltage wire leading to that color's developer housing is grounded. Inspect the high-voltage wiring harness and power supply. Repair/replace as necessary. 12.Replace the Laser Unit (RRP 38, on page 7-200). 13.Replace the T3 High-Voltage Power Supply (RRP 44, on page 7-208). 14.Replace the T2 High-Voltage Power Supply (RRP 48, on page 7-213). Phaser 7700 Color Laser Printer Service Manual 3-109
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