Xerox 7700DX Service Manual - Page 126
Tray 2, 3 and 4 Will Not Lift or Printer Will Not Recognize the Auxiliary Feeder
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Tray 2, 3 and 4 Will Not Lift or Printer Will Not Recognize the Auxiliary Feeder There are two circuits connecting the printer to the auxiliary feeder: the Power Circuit and the Serial Data Link. 1. Check that the auxiliary feeder is properly connected to the back of the printer. 2. From the Front Panel check to see if the auxiliary feeder is recognized by the printer. 3. Remove the rear panel of the auxiliary feeder. Check for presence of +5 VDC, +24 VDC and +3.3 VDC at the auxiliary feeder control board P555-2, -4 and -6. Check for continuity of the DC return lines. 4. Check the continuity of the serial data link circuit by verifying continuity between Engine Control Board P407B-9, -10, -11, -12, -13 and -14, and the auxiliary feeder Board P541-1, -2, -3, -4, -5 and -6. 5. Replace the Auxiliary Feeder Control Board (RRP 60, on page 7-229). 6. Replace the Engine Control Board (RRP 42, on page 7-206). Printer Will Not Recognize the Finisher The Finisher is connected to the printer by a complementary pair serial data link. The Finisher also generates its own +5 VDC from +24 VDC supplied by the printer. 1. Check that the Finisher is properly connected to the printer. 2. From the Front Panel check to see if the Finisher is recognized by the printer. 3. Remove the Rear Cover and Board Cover from the Finisher 4. Check for presence of +24 VDC between the Finisher Board P844-2 and Finisher frame ground. 5. Turn the power Off and check the continuity of the serial data link circuit by verifying continuity between P531B-9 through -16 on the Engine Control Board, and P843-1 through -8 on the Finisher Board. 6. Replace the Finisher Board (RRP 77, on page 11-336). 7. Replace the Engine Control Board (RRP 42, on page 7-206). 3-96 Phaser 7700 Color Laser Printer Service Manual
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