Konica Minolta bizhub PRO 920 Service Manual page 497

Field Service Ver2.0 Aug.2005
Classification Code
Wire SC21-02
cleaning
abnor-
mality
SC21-03
Causes
• The blowout of ICP for the
charge cleaning motor (M23)
in the printer control board
(PRCB) is checked.
When the charge cleaning
home sensor (PS41) is OFF
with the main power switch
(SW1) ON, PS41 does not
turn ON within a specified
period of time after the M23
turns ON for home position
research operation (return
operation). And at this time,
an error detection signal
(blowout of ICP) is detected.
• PS41 does not turn OFF
within a specified period of
time after the reverse opera-
tion (return operation) is
started. And at this time, an
error detection signal (blow-
out of ICP) is detected.
• The charge cleaning limit sen-
sor (PS42) does not turn ON
within a specified period of
time after the reverse opera-
tion (return operation) is
started for detection of PS41
being OFF. Or, PS41 does not
turn ON within a specified
period of time after PS42
turns ON. At this time, an
error detection signal (blow-
out of ICP) is detected.
The locking of the charge clean-
ing motor (M23) is detected.
A motor lock signal is detected
while moving from the charge
cleaning limit sensor (PS42) side
to the charge cleaning home sen-
sor (PS41) side, and after a retry
operation, a fifth motor lock signal
is detected.
13. MALFUNCTION CODE
Resulting Estimated abnormal parts
operation
The main body Charge cleaning motor
stops immedi- (M23)
ately to turn OFF Printer control board
the main relay (PRCB)
(RL1). Charge cleaning home sen-
sor (PS41)
Charge cleaning limit sensor
(PS42)
Wiring harness broken
Loose connection
Charge cleaning motor
(M23)
Printer control board
(PRCB)
Charge cleaning home sen-
sor (PS41)
Charge cleaning limit sensor
(M23)
Charging/cleaning member
465