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An incorrect printer driver for the installed software can cause prob-
lems. Incorrect characters could print and the copy may not fit the
page properly.
Measure all voltages from the connector to printer ground.
Be sure to turn the printer off before you make any checks on the
transfer corona.
Locate your symptom below, note the possible causes, and take the
appropriate action. Be sure all associated connectors are plugged in
correctly.
Print Quality - All Black Page
FRU
1
Print Unit
2
HVPS
3
• Intercon-
nect Board
• Engine
Board
2-14
Action
Check the precharger wire on the print unit for dirt
or damage. Clean the wire with the cleaning tool
provided with the printer. If the wire has come loose
from the print unit, the customer must replace the
print unit.
Check the HVPS contacts on the HVPS board and
the mating contact springs on the left side of the
printer for pitting or incorrect alignment. Cables
from the pick roller motor and cover open switch
can get in the way of the contacts.
Be sure the HVPS connects to the interconnect
board correctly. Be sure the interconnect board
connects to the engine board correctly. If all the
connections are correct, replace the following FRUs
in the order shown:
1. HVPS
2. Interconnect Board
3. Engine Board
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