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6
Abnormal trimming
a. Defective trimming (TR-I) switch.
b. Defective control (SG) motor.
c. Defective trimming (TR-G) switch.
d. Defective T-cutter.
Problem
a. Defective
Is document correctly
trimming (TR-I)
inserted?
switch
Does the T-sensor lever
press the trimming switch
(leaf switch TRI assy) when
a document is inserted?
Is the leaf switch open when
no document is inserted?
Is the black lead connector
connected to CN2 on the
Main PCB?
Is main CPU port P93 (Pin
12) at High level when
trimming switch TR-I is
open and SW3 and SW4 on
the Switch PCB are not
pressed?
When trimming switch TRI
is shorted, is CN2 on the
Main PCB shorted?
Is main CPU port P93 (Pin
12) at Low level when CN2
on the Main PCB is
shorted?
When Main CPU port P93
(Pin 12) is at Low level, is
this recognized by the main
CPU?
Check Item
Document inserted
incorrectly.
Incorrectly installed
trimming switch.
Incorrectly installed
T-sensor lever.
Defective T-sensor
lever.
Leaf switch assy not
connected.
Conductivity problem
in Main PCB.
Defective pull-up
resistor R51.
Defective trimming-
switch TRI assy.
Conductivity problem
in Main PCB.
Defective series
resistor R33.
Defective main
CPU#3.
Cause
Remedy
Correctly insert the
document.
Correctly install the
trimming switch.
Correctly install the
T-sensor lever.
Replace the T-cutter
assy.
Correctly connect
the leaf switch assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace trimming-
switch TRI assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
Replace Main PCB
assy.
7-12
See
Repair
Section
−−−
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.15
3.3.3
3.3.4
3.3.5
3.3.3
3.3.4
3.3.5
Replace R51.
3.4.2
3.5.1
3.3.1
3.3.3
3.3.4
3.3.5
3.4
3.15
3.3.3
Replace R33.
3.3.4
3.3.5
Replace
3.4.2
CPU#3.
3.5.1
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