21 May, 1999
ELECTRICAL COMPONENT DEFECTS
7-35
Trouble-
shooting
7.4 ELECTRICAL COMPONENT DEFECTS
7.4.1 DEFECTIVE SENSOR TABLE
Sensor
Status
Symptoms if Defective
Document sensor
ON
The LCD displays "CLEAR ORIGINAL" or "DIAL
FAX NO" at power-up.
OFF
The LCD still displays "SET DOC. OR DIAL
NO." after a document is placed in the feeder.
Scan line sensor
ON
The LCD displays "CLEAR ORIGINAL" at
power-up.
OFF
The LCD displays "CLEAR ORIGINAL" soon
after the start of copying.
Interlock switches
ON
There is no alarm on opening the cover, and the
LCD does not display "CLOSE COVER".
OFF
The LCD displays "CLOSE COVER" at power-
up.
Registration sensor
ON
The LCD displays "CLEAR COPY" at power-up.
Paper edge sensor
ON
The LCD displays "CLEAR COPY" at power-up.
Fusing exit sensor
ON
The LCD displays "CLEAR COPY" soon after the
start of copying.
Toner end sensor
ON
The LCD displays "SET TONER" at power-up.
Paper end sensor -
standard cassette
ON
The ADD PAPER indicator lights even if paper is
remaining.
Paper end sensor –
paper feed unit
ON
The Add Paper indicator on the operation panel
of the lower cassette lights even if paper
remains.
Paper end sensor –
multi-purpose feeder
ON
The Add Paper indicator on the operation panel
of the lower cassette lights even if paper
remains.
Upper rear cover
switch
ON
The LCD displays "CLOSE COVER" at power-
up.
Lower rear cover
switch
ON
The LCD displays "CLOSE COVER" at power-
up.
7.4.2 BLOWN FUSE TABLE
The only service-replaceable fuses are the following.
Fuse
Symptoms if Defective
PSU - F1/ F2/F3
The machine does not receive power
(F3 - 220V PSU only)
Thermofuse (Not installed in the
US model.)
Fusing power is not supplied.
