Checking The Developer; Tips - Xerox 7700DX - Phaser Color Laser Printer Service Manual

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