(10) Uneven Image Density - Konica Minolta 7115 Service Manual

(10) Uneven image density

Section Step
Output 1 PC Drum ground plate is dirty, scratchy,
system deformed, worn, or damaged.
2 PC Drum Charge Corona grid mesh and
Comb Electrode are dirty, scratchy,
deformed, worn, damaged, or loose.
3 Image Transfer Roller is dirty, scratchy,
deformed, worn, or damaged.
4 Sleeve/Magnet Roller is dirty, scratchy,
deformed, worn, or damaged.
5 Toner is even on Sleeve/Magnet Roller.
6 Developer is not even in the Developer
Mixing Chamber of IU.
Input 1 Original Glass is dirty, scratchy, worn, or
system damaged.
2 Shading sheet reading portion (the por-
tion on the backside of the Original
Glass to which Original Width Scale is
affixed) is dirty.
3 Scanner mirrors are dirty, scratchy, or
damaged.
4 Exposure Lamp (LA2) is dirty.
5 CCD Unit lens and CCD surface are
dirty or scratchy.
<Check Procedure>
Remove lens cover to check for possible
contamination.
6 Exposure Lamp is abnormally lit (flickers
or abnormally dark) when the Power
Switch is turned ON.
7 Inverter Board (copier: PU2) connector
CN1PU2 is loose.
8 CCD Board (copier: PWB-J) connector
is loose.
Check Result
YES • Clean, correct, or
YES • Clean, correct, or
YES • Clean or change.
YES • Clean or change.
NO
YES • Even out developer in
NO
YES • Clean or change.
YES • Clean.
YES • Clean or change.
YES • Clean or change.
YES • Clean or change.
NO
YES • Reconnect.
NO
YES • Reconnect.
T-56
Action
change.
change.
• Adjust DB.
For details, see DIS/
REASSEMBLY,
ADJUSTMENT.
the Developer Mixing
Chamber.
• Change IU.
• Change Master Board
(copier: PWB-A).
• Go to step 8.
• Change Exposure
Lamp (LA2).