16. IMAGE QUALITY PROBLEM Field Service Ver. 2.0 Jun. 2010
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TROUBLESHOOTING
16.2.15 Printer section: Foggy background or rough image
A. Typical faulty images
B. Troubleshooting procedure
A09AF3C525DA
Step Check Result Action
1The image changes when “ID ADJUST” and “VG
ADJUST” are executed.
YES • Readjust. For details, see
ADJUSTING/SETTING.
2Drum surface and the areas in contact with Ds collars
are dirty with foreign matter, or deformed or worn.
YES • Clean or change.
3Grid bias contact is dirty, scratchy, deformed, worn, or
damaged.
YES • Clean, correct, or
change.
4TCR sensor (TCRS) is dirty with foreign matter
(such as paper dust) other than developer.
YES • Clean.
5Is a power voltage supplied across CN-2, 3 on PRCB?
<Check procedure>
• Check voltage across a master board pin and GND
when the power switch is turned ON.
NO • Change TCR sensor
(TCRS) and then change
developer.
6The following voltage is supplied from the printer control
board (PRCB).
<Check procedure>
• Check that there is 24 V developing across the printer
control board pin and GND when the power switch is
turned ON (during a copy cycle or a standby state).
YES • Adjust Db.
For details, see ADJUST-
ING/SETTING.
•Change drum.
•Change imaging unit.
•Change high voltage unit
(HV1).
NO • Change printer control
board (PRCB).
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