Konica Minolta BIZHUB 163 Service Manual page 224

Field Service Ver. 1.0 Apr. 2007
16.2.14 Printer section: Low image density
A. Typical faulty images
B. Troubleshooting procedure
Step
The image changes when "TONER REPLENISHER" is
1 executed.
• "Toner Replenisher" of Utility
The image changes when "ID ADJUST" and "VG
2
ADJUSTt" are executed.
3 Image transfer current contact is dirty, folded, or bent.
4 Developing bias contact is dirty, folded, or bent.
5 High voltage unit (HV1) connectors is loose.
TCR sensor (TCRS) is dirty with foreign matter
6
(such as paper dust) other than developer.
The following voltages develop from the TCR sensor
(TCRS).
<Check procedure>
7 Check voltage across a master board pin and GND when
the power switch is turned ON.
• DC5.39 V to 8.15 V across PJ10A-1 and GND
• DC1.41 V to 4.98 V across PJ10A-3 and GND
The following voltage is supplied from the printer control
board (PRCB).
<Check procedure>
8
• 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).
Check
16. Image quality problem
A09AF3C524DA
Result Action
• Replenish the supply of
YES toner using toner
replenisher.
• Readjust.
YES For details, see
ADJUSTING/SETTING.
• Clean, correct, or
YES
change.
• Clean, correct, or
YES
change.
YES • Reconnect.
YES • Clean.
• Change TCR sensor
NO (TCRS) and then
change developer.
• Change IU.
YES • Change high voltage
unit (HV1).
• Change printer control
NO
board (PRCB).
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