Void Areas, White Spots - Konica Minolta BIZHUB C3100P Service Manual

Step Section
2 IDC sensor
3 AIDC PROCESS
4 Image check
5 Imaging unit
6 PH unit
7 Printer control board
(PRCB)
8

5.2.11 Void areas, White spots

(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
[1]
[1] Void areas
(2) Initial troubleshooting procedure
Step Section
1 IDC sensor
2 AIDC PROCESS
3 Image check
(3) 1-color troubleshooting procedure
Step Section
1 Image Check
2
3 Imaging unit
4 Toner cartridge
5 Installation environment
(4) 4-color troubleshooting procedure
Step Section
Check item
• IDC sensor is dirty.
• IDC sensor cover does not operate properly.
Select [Service Mode] -> [SYSTEM 2] -> [AIDC
PROCESS] and the image trouble is eliminated.
• Select [Service Mode] -> [PRINT MENU] ->
[HALFTONE 256]. Load tray with A4 paper. This runs a
print cycle for C, M, Y, and K in that order.
• Check the image after printing to determine which color
causes the abnormal image.
Dirty on the outside.
The surface of the PH window is dirty.
Check the connection of connectors, harness, and flat
cables between PRCB and PH unit, and correct if
necessary.
The problem has been eliminated through the checks of
steps up to 7.
[2]
Check item
• IDC sensor is dirty.
• IDC sensor cover does not operate properly.
Select [Service Mode] -> [SYSTEM 2] -> [AIDC
PROCESS] and the image trouble is eliminated.
• Select [Service Mode] -> [PRINT MENU] ->
[HALFTONE 64]. Load tray with A4 paper. This runs a
print cycle for C, M, Y, and K in that order.
• If the abnormal image does not recur, perform
Mode] -> [PRINT MENU] -> [HALFTONE 256]
make a print check.
• Check the image after printing and the abnormal image
occurs only with one color.
Check item for the faulty color
There are void areas at the front side or high density
section.
There is void area at the rear side section.
The surface of the PC drum is scratched.
Foreign matter or caked toner in the toner cartridge.
Is the atmospheric pressure at the installation site low?
Check
K TROUBLESHOOTING > 5. IMAGE QUALITY PROBLEM
Result
YES
YES
YES
[2] White spots
Result
YES
YES
[Service
and
Result
YES
YES
YES
YES
YES
Result
K-32
Action
• Clean.
• Clean or correct the IDC sensor
cover.
NO Go to the next step.
- Go to the next step.
Clean.
Clean with cleaning jig.
NO Replace the printer control board.
NO • Replace the imaging unit.
• Replace the PH unit.
• Replace the high voltage unit.
Action
• Clean.
• Clean or correct the IDC sensor
cover.
NO Go to the next step.
Go to 1-color troubleshooting
procedure.
NO Go to 4-color troubleshooting
procedure.
Action
K.7.2.6 Faint image, low image
density (ID lowering)
Make the following adjustment:
[Service Mode] -> [SYSTEM 2] ->
[MEDIA ADJUSTMENT].
Replace the imaging unit.
Remove foreign matter.
Make the following adjustment:
[Service Mode] -> [MACHINE] ->
[ALIGNMENT] -> [IMAGE ADJ
PARAM].
Action