15. Image Quality Problems; 15.1 How To Identify Problematic Part; 15.2 Solution; Blank Or Black Prints - Konica Minolta pagepro 5650EN Service Manual

Field Service Ver. 1.0 Nov. 2007

15. Image quality problems

15.1 How to identify problematic part

• Let the machine produce a test print and determine whether the image problem is attrib-
utale to the engine or controller system.
See P.148

15.2 Solution

15.2.1

Blank or black prints

A. Typical faulty images
B. Troubleshooting procedure
Step Section
1 Print unit
2
Toner cartridge
3
Print control
4
board
⎯
5
Check item
Is a printed page blank?
Is the coupling of the drive mech-
anism of the toner cartridge prop-
erly connected?
Is the drum charge voltage con-
tact point or PC drum ground con-
tact point of the toner cartridge
properly connected?
Is the print control board (PRCB)
connector connected properly?
Was the problem eliminated when
step 4 was checked?
15. Image quality problems
Result Action
Check the PH Unit connectors for
YES
proper connection.
Check the coupling of the drive
mechanism for connection and
NO
correct it as necessary, or replace
the toner cartridge.
Check, clean, or correct the
NO
contact point.
NO Connect it properly.
Replace the print control board
(PRCB).
NO
Replace the MFP board (MFPB).
Replace the PH unit.
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