Monocolor: Blank Print, Black Print - Konica Minolta magicolor 7450 Service Manual

16. Image quality problem
16.3.11

Monocolor: blank print, black print

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Image Check
1
Imaging Unit
2
3
High Voltage Unit
4 (Image Transfer,
Neutralizing)
5
226
Blank print
4036fs4038c0
Check Item
A blank print occurs.
Coupling of IU drive mechanism
is installed properly.
The PC Drum Charge Corona
voltage contact or PC Drum
ground contact of the Imaging
Unit is connected properly.
Connector is connected properly.
The problem has been eliminated
through the check of step 4.
Field Service Ver. 1.0 May 2006
Black print
4036fs4039c0
Result
YES Check PH Unit connector for
proper connection.
NO Check and correct drive transmit-
ting coupling.
Change IU.
NO Check, clean, or correct the con-
tact.
NO Reconnect.
NO Change High Voltage Unit
(Image Transfer, Neutralizing).
→ Change Controller Board
→ Change PH Unit.
Action