Field Service Ver. 2.0 Jun. 2010 16. IMAGE QUALITY PROBLEM
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TROUBLESHOOTING
16.2.14 Printer section: Low image density
A. Typical faulty images
B. Troubleshooting procedure
A09AF3C524DA
Step Check Result Action
1The image changes when “TONER SUPPLY” in SERVICE
MODE is executed.
YES • Replenish the supply of
toner using “TONER
SUPPLY”.
2The image changes when “ID ADJUST” and “VG
ADJUST” are executed.
YES • Readjust.
For details, see
ADJUSTING/SETTING.
3Image transfer current contact is dirty, folded, or bent. YES•Clean, correct, or
change.
4Developing bias contact is dirty, folded, or bent. YES•Clean, correct, or
change.
5High voltage unit (HV1) connectors is loose. YES • Reconnect.
6TCR sensor (TCRS) is dirty with foreign matter
(such as paper dust) other than developer.
YES • Clean.
7Is 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.
8The 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 • Change IU.
•Change high voltage
unit (HV1).
NO • Change printer control
board (PRCB).
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