Panasonic UF-5500 Service Manual page 135

11.2.3.6. INFO CODE=090
"INFO CODE=090" indicates that abnormal charge voltage is output from the high voltage unit.
INFO CODE=090 appears when the charge voltage turns into abnormal voltage caused by charge wire breaking,
short circuit, defect, and contact failure between Drum Cartridge and main frame through charge and GRID terminals.
When the charge voltage becomes abnormal, the high voltage unit shuts off the charge output, and then trouble
detection signal (HVERR) is output from pin 2 of CN1.
When the main PCB detects the trouble detection signal, the unit displays INFO CODE=090.
INFO CODE=090 is canceled by turning the power OFF then ON. (When the problem is not solved, INFO CODE=090
will be displayed again.)
INFO CODE=090
Replace the Drum Cartridge
with a brand-new one or the
unit checked on another set
working properly.
INFO CODE=090
Did
appear again?
No
Confirm the high voltage
contacts on the unit.
Were there any problems
with the contacts?
No
Refer to the troubleshooting
guide of high voltage unit.
Confirming the contact points of the main
Check the dirt on the high voltage terminals.
Check if the spring pressure of each high voltage terminal is strong enough.
(Isn't it distorted or bent?)
When a Drum Cartridge is installed on the main frame, are the terminals
connected to the main
Confirming the Drum Cartridge (In case that replacement of the development
unit caused INFO CODE=090
Check if the charge wire has breaking, loose, or dirt, etc.
In case that the dirt is found on the charge wire, does the unit become normal
after getting rid of the dirt?
The charge wire should be cleaned with a soft cloth soaked in ethanol.
Be careful not to cut the wire.
Are the contact terminals of Drum Cartridge clean?
Yes
Replace the
Drum Cartridge.
Yes Clean the high
voltage contact
points.
Yes
135
frame
frame surely?
to appear again.)
INFO CODE=090
Did
appear again?
Yes
Replace the
Drum Cartridge.
INFO CODE=090
Did
appear again?
No
END
UF-5500 / 4500
No
END