Xerox 7750DXF - Phaser Color Laser Printer - Lower Tray Communication Failure, Code 88

3-44 Phaser 7750 Printer Service Manual
Lower Tray Communication Failure, Code 88
Troubleshooting References
Applicable Parts Wiring and Plug/Jack Map References
■ Engine Control Interface Board
■ Tray module board
■ Engine Control board
Troubleshooting Procedure
Step Actions and Questions Yes No
1
Is J668-1 on the tray module board
+5 VDC?
Go to step 2. Use the wirenets
to troubleshoot
and repair the
open wire.
2
Is J668-3 on the tray module board +24
VDC?
Go to step 3. Use the wirenets
to troubleshoot
and repair the
open wire.
3
1. Check the following connectors for
continuity:
■ P669-1 to J534A-15
■ P669-2 to J534A-14
■ P669-3 to J534A-13
■ P669-4 to J534A-12
■ P669-5 to J534A-11
■ P669-6 to J534A-10
2. Do all checks indicate continuity?
Replace in the
following order:
■ engine control
interface board
■ tray module
board
■ engine control
board
Check and repair
broken wires or
bad connectors.