Xerox 7700DX Service Manual - Page 132
Checking the Developer, Tips, ATC Sensor Setup, Photo Mode
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Checking the Developer If, after these checks, the problem still exists: 1. Inspect the wiring harnesses leading to the Developer for nicks, pinched wiring, or poor connections. 2. If the wiring harnesses are OK, replace the Developer (RRP 27, on page 7-185). 3. After installing a new Developer, print 25 100% Solid Fill, A-size pages to ensure it prints correctly. If the problem still exists, replace the Engine Control Board (RRP 42, on page 7-206). Tips ATC Sensor Setup When you replace an ATC Sensor or a Developer, make sure to program the ATC Sensor's calibration value into the printer's engine's NVRAM. Use the Adjustment/Calibrations menu's ATC Sensor Setup Test. Backup the new engine NVRAM values to the printer's hard drive using the NVRAM Access menu's Store Engine NVRAM menu item. Replacement ATC Sensors and the ATC Sensor on a replacement Developer Housing both include a tear off sticker with the Sensor's calibration value printed on it. Apply the sticker near to the corresponding Developer, behind the Waste Cartridge. (Next to the laser-cleaning slot is good location.) Photo Mode Among other actions, selecting Photo Mode causes the printer to perform a Developer bead agitation cycle between printing each page. This allows the electrical charge applied to the toner in the Developer Housing to be evenly distributed to all the toner. This ensures better, more even, toner transfer to the Accumulator Belt resulting in the colors of the last high-coverage print looking the same as the colors in the first high-coverage print. 3-102 Phaser 7700 Color Laser Printer Service Manual
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