Konica Minolta bizhub PRO 920 Service Manual page 509

Field Service Ver2.0 Aug.2005
Classification Code
Fusing SC36-03
sensor
abnor-
mality
SC36-04
SC36-05
SC36-06
Scanner SC41-01
abnor-
mality
Writ- SC41-02
ing
sec-
tion
abnor-
mality
Causes
Thermistor /1 (TH1) low tempera-
ture detection (hardware). The
output voltage of the TH1 is
detected as a low temperature
abnormality (-6°C or lower) in the
comparator circuit.
Thermistor /3 (TH3) low tempera-
ture detection (hardware). The
output voltage of the TH3 is
detected as a low temperature (-
6°C or lower) in the comparator
circuit.
Thermistor /2 (TH2) low abnor-
mality detection (hardware). The
output voltage of the TH2 is
detected as a low temperature (-
6°C or lower) or high temperature
(240.5°Cor higher) abnormality in
the comparator circuit.
Thermistor /4 (TH4) low abnor-
mality detection (hardware). The
output voltage of the TH4 is
detected as a low temperature (-
6°C or lower) or high temperature
(240.5°Cor higher) abnormality in
the comparator circuit.
The scanner home sensor (PS51)
does not turn ON within a speci-
fied period of time after the home
position search is started.
When the speed of the polygon
motor (M17) is being switched, a
speed lock signal is not detected
within a specified period of time.
13. MALFUNCTION CODE
Resulting Estimated abnormal parts
operation
The main body Printer control board
stops immedi- (PRCB)
ately to turn OFF AC drive board (ACDB)
the main relay Fusing heater lamp /1 (L2)
(RL1). Fusing heater lamp /2 (L3)
Fusing heater lamp /3 (L4)
Thermistor /1 (TH1)
Caution
Thermistor /2 (TH2)
• When SC34-
Thermistor /3 (TH3)
**, SC35-**
Thermistor /4 (TH4)
or SC36-**
(fusing tem-
perature
related
abnormali-
ties) occur,
be sure to
repair
defective
parts before
setting the
software
DIPSW3-1
to 0. Set-
ting the
DIPSW3-1
to 0 with
defective
parts not
repaired
may result
in a fire.
The main body Scanner drive board (SDB)
stops immedi- Scanner motor (M13)
ately to turn OFF Scanner home sensor (PS5)
the main relay DC power supply /2
(RL1). (DCPS2)
Wiring harness earth fault
Loose connection
Scanner drive board (SDB)
Polygon motor drive board
(PMDB)
Polygon motor (M17)
477