Troubleshooting Procedures By Image Failure; Blank Copy - Minolta Di152 Service Manual

5-4.

Troubleshooting Procedures by Image Failure

(1)

Blank copy

Section Step
Output system 1
2
3
4
5
6
7
8
9
Input system 1
2
Check
Imaging Unit is installed correctly.
Connector between the Imaging
Unit and copier is dirty.
PH Shutter (located along the
laser path between the PH Unit
and PC Drum) is not in correct
position or malfunctions.
PH Unit connectors PJ12A and
PJ13A are loose.
Image Transfer Roller Assy is
installed correctly.
Image transfer current contact is
dirty, broken, or bent.
Developing bias contact is dirty,
broken, or bent.
High Voltage Unit (HV1) connec-
tors CN1HV1 and CN2HV1 are
loose.
The following voltage is supplied
from the Master Board (copier:
PWB-A).
<Check Procedure>
Check voltage across a Master
Board pin and GND when the
Start key is pressed.
• Voltage across PJ8A-8 and
GND
DC14 V in standby state
DC0 V when Start key is
pressed
CCD Board (PWB-J) connector
JP7C is loose.
Control Board (copier: PWB-C)
connector PJ1A is loose.
T-45
Result Action
NO • Reinstall.
YES • Clean.
YES • Correct or reinstall.
YES • Reconnect.
NO • Reinstall.
YES • Clean, correct, or
change.
YES • Clean, correct, or
change.
YES • Reconnect.
YES • Change IU.
• Change PH Unit.
• Change High Volt-
age Unit (HV1).
NO • Change Master
Board (copier:
PWB-A).
YES • Reconnect.
YES • Reconnect.
NO • Change Control
Board (copier:
PWB-C).
• Change Master
Board (copier:
PWB-A).