Black Copy - Minolta Di152 Service Manual

(2)

Black copy

Section Step
Output 1 PC Drum Charge Corona grid mesh and
system Comb Electrode are loose.
2 PC Drum Charge Corona contact is dirty,
scratchy, folded, bent, or damaged.
3 Grid bias contact is dirty, folded, or bent.
4 PC Drum ground contact is dirty,
scratchy, bent, or damaged.
5 High Voltage Unit (HV1) connectors
CN1HV1 and CN2HV1 are loose.
6 PH Unit connectors PJ12A and PJ13A
are loose.
7 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
Input 1 Exposure Lamp turns ON when the
system Power Switch is turned ON.
2 Exposure Lamp is abnormally lit (flickers
or abnormally dark) when the Power
Switch is turned ON.
3 Inverter Board (copier: PU2) connector
is loose.
4 CCD Board (copier: PWB-J) connector is
loose.
5 Control Board (copier: PWB-C) connec-
tor PJ1A is loose.
6 The following voltage is supplied from
the Control Board (copier: PWB-C).
<Check Procedure>
Check voltage across a Control Board
(copier: PWB-C) pin and GND when the
Power Switch is turned ON.
• Voltage across JP16C-4 and GND
DC24 V when Exposure Lamp (LA2) is
OFF
DC0 V when Exposure Lamp (LA2) is
ON
Check
T-46
Result Action
YES • Reinstall.
YES • Correct or change.
YES • Clean, correct, or
change.
YES • Clean, correct, or
change.
YES • Reconnect.
YES • Reconnect.
YES • Change IU.
• Change PH Unit.
• Change High Volt-
age Unit (HV1).
NO • Change Master
Board (copier:
PWB-A).
NO Go to step 3.
NO Go to step 4.
YES Reconnect.
NO Change Exposure
Lamp.
YES Reconnect.
YES Reconnect.
YES • Change Inverter
Board (PU2).
• Change CCD Unit.
NO • Change Control
Board (copier:
PWB-C).