Minolta CF910 Service Manual page 427

<Troubleshooting Procedure>
Cause Step
Defective 13
Paper Sepa-
rator/ Charge
14
Neutralizing
Unit
Defective 15
Developing
Unit
16
Defective PC 17
Drum
18
19
Defective 20
Cleaning Unit
21
Defective 22
Paper Take-
Up/Transport
Unit
Check Item
Is the Paper Separator Corona
dirty or deteriorated?
If white bands persist in the FD direction even after performing step
2 through 13, the PH Unit is probably contaminated; therefore,
replace it.
Do the Sleeve/Magnet Roller
and Developer Supply Roller
turn
properly?
Is the developing bias being
output properly.
Is the surface of the PC Drum
dirty or scratched?
Is the PC Drum grounded
properly?
Are the edges of the PC Drum
dirty?
Are the Corona Wire and
Housing dirty or deteriorated?
Is the connector on HV1 con-
nected properly?
Is the Paper in the Drawer
damp?
T-60
Result Action
YES Clean or replace it.
NO Check the wiring between
PWB-I and M19 and, if it is
intact, change M19.
NO Check the wiring between
PWB-I and HV4 and, if it is
intact, change HV4.
YES Change the PC Drum.
Change the Cleaning Blade
if necessary. ("AIDC Mode/
AIDC Offset" and "Grada-
tion Adjust")
NO Clean or change the PC
Drum ground plate.
YES Clean the edges.
YES Clean or change the
Corona Wire and Housing.
("Gradation Adjust")
NO Reconnect the connector.
YES A. Check if the Dehumidi-
fying Heater is malfunc-
tioning.
B. Check if the Paper
Dehumidifying Switch is
on.