Photodeveloper Missing Service Check; Power Supply Service Check - Lexmark C920 Service Manual

Photodeveloper missing service check

When you replace the photodeveloper unit, all three color units must be replaced at the same time.
FRU
1 Photodeveloper
2 Sub-frame unit
3 High voltage unit
4 Printer controller board

Power supply service check

FRU
1 Voltage
2 Power cord
3 • Fuse
• Switch
• Power supply 1
4 Power supply 2
Action
Check for dirt or damage to the sensing contacts on the rear. Clean
or replace the photodeveloper drum unit if necessary.
Check the sensing contacts on the sub-frame assembly. Clean or
replace the affected contacts or sub-frame.
If the problem remains, replace the high voltage unit (HVU).
If the problem remains, replace the printer controller board.
Action
Be sure the switch is on, and the power cord is firmly plugged into
the printer. Be sure the correct voltage is present at the outlet.
Check the power cord for continuity.
The power supply fuses may be blown. Unplug the machine, and
check fuse F2 on the power supply 1 for continuity. If the fuse is
good, check the power switch connector for continuity.
The power supply 2 may be defective.
Check the dc power of the power supply for the following pins:
CN102 pins 8 and 11 for +3.3 V
CN103 pins 7 and 14 for +3.3 V
CN105 pin 5 for +3.3 V
CN102 pins 12 and 14 for +5 V
CN103 pins 1, 3, 8, 9 for +5 V
CN104 pins 1 and 2 for +5 V
CN104 pins 7 and 8 for +24 V
CN105 pin 4 for +24 V
CN106 pins 5 and 6 for +24 V
Replace power supply 2 if necessary.
5056-XXX
2-61
Diagnostic information