ELECTRICAL COMPONENT DEFECTS
SM 7-21 B089/B093
Trouble-
shooting
7.5 ELECTRICAL COMPONENT DEFECTS
7.5.1 SENSORS
Component
(Symbol)
CN Condition Symptom
Open SC120 is displayed.
Scanner H.P
337-2
(SBCU)
Shorted
The CPU does not detect the scanner
home position and the scanner motor
does not stop.
Open APS and ARE do not function correctly.
Platen Cover
337-5
(SBCU)
Shorted No symptom
Open
Original Width
335-3, -4
(SBCU)
Shorted
The CPU cannot detect the original size
properly. APS and ARE do not function
correctly.
Open
Original Length-
1
335-8, -9
(SBCU)
Shorted
The CPU cannot detect the original size
properly. APS and ARE do not function
correctly.
Open
Original Length-
2
336-3, -4
(SBCU)
Shorted
The CPU cannot detect the original size
properly. APS and ARE do not function
correctly.
Open
Toner Density
327-3
(SBCU)
Shorted
SC390 is displayed
Open
The Paper End indicator lights even if
paper is placed in the 1st paper tray.
1st Paper End
306-2
(SBCU)
Shorted
The Paper End indicator does not light
even if there is no paper in the 1st paper
tray.
Open
The Paper End indicator lights even if
paper is placed in the 2nd paper tray.
2nd Paper End
307-A2
(SBCU)
Shorted
The Paper End indicator does not light
even if there is no paper in the 2nd paper
tray.
Open
Image Density
321-3
(SBCU)
Shorted
SC392 is displayed (see note)
Open
The paper overflow message is not
displayed when the paper overfull
condition exist.
Paper Over
Flow
324-5
(SBCU)
Shorted
The paper overflow message is
displayed.
Open
The Paper Jam indicator will light
whenever a copy is made.
Paper Exit
324-2
(SBCU)
Shorted
The Paper Jam indicator lights even if
there is no paper.
Open
The Paper Jam indicator will light
whenever a copy is made.
Upper Relay
306-5
(SBCU)
Shorted
The Paper Jam indicator lights even if
there is no paper.
Open
The Paper Jam indicator will light
whenever a copy is made.
Lower Relay
307-A5
(SBCU)
Shorted
The Paper Jam indicator lights even if
there is no paper.
To Next Page
Loading...
