Image Stabilizer Malfunction; P-1: Ng (Ld Failure; P-2: Ng (Vg Failure - Minolta CF910 Service Manual

4-4.

Image Stabilizer Malfunction

(1) P-1: NG (LD Failure)

Step
1 Are the PH Upper and Lower Units
installed properly?
2 Is there any print jack left loose on PWB-I,
-JD, and -JA, SOS Board, and Polygon
Motor Drive Board?
3 Is the PH Lower Unit window dirty?
4 Is there any foreign matter in the light path
between the PH and PC Drum?

(2) P-2: NG (VG Failure)

Step
1 Is the PC Drum Charge Corona wire dirty?
2 A. Turn ON the Front Door Interlock Switch with predrive ON.
B. With tester probes applied to the PC Drum Charge Corona grid, turn ON the
Power Switch and check for the HV output.
3 Does the HV output change in the order of
600V, 500V, 900V, and 700V?
4 Is there any print jack left loose on the
HV1 board?
5 Open the "Life 3 (Others)" screen from the
"Counter" menu of the Service mode. Has
"PC Drum" reached the replacement
time?
Check Item
Check Item
T-93
Result
NO Reinstall the unit.
YES Plug the print jacks into posi-
tion.
YES Clean the window. ("Gradation
Adjust")
YES Remove the foreign matter.
NO Change the Polygon Motor
Drive Board, PWB-JA, and -JD,
and PH Upper and Lower Units
as a set. ("IR Area," "PRT
Area," and "Gradation Adjust")
Result
YES Clean the wire.
NO Check the wiring between
PWB-I and HV1 and, if it is
intact, change HV1.
YES Plug the print jacks into posi-
tion.
YES Change the PC Drum. ("AIDC
Sensor/Offset," "Gradation
Adjust")
NO Change the PC Drum Charge
Corona. ("Gradation Adjust")
If the "NG" display persists
even after the corona has been
changed, change the Polygon
Motor Drive Board, PWB-JA,
and -JD, and PH Upper and
Lower Units as a set. ("IR
Area," "PRT Area," and "Grada-
tion Adjust")
Action
Action