Tray 2, 3 And 4 Will Not Lift Or Printer Will Not Recognize The Auxiliary Feeder; Printer Will Not Recognize The Finisher - Xerox Phaser 7700 Service Manual

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 +5VDC,
+24VDC and +3.3VDC 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 7-210).
6. Replace the Engine Control Board (RRP 42, on page 7-190).

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 +5VDC from +24VDC 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 +24VDC between the Finisher Board P844-2 and Finisher
frame ground.
5. Turn off power 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 11-316).
7. Replace the Engine Control Board (RRP 42, on page 7-190).
Service Quick Reference Guide - Troubleshooting
3-95