2A3/4
3-6-83
Defective engine
PCB.
Defective original
detection switch.
Original is not
placed correctly.
Poor contact in the
original size
sensors connector
terminals.
Defective original
size sensor or the
scanner motor
PCB.
Poor contact in the
touch panel con-
nector terminals.
Defective touch
panel or operation
unit main PCB.
Poor contact in the
upper paper switch
connector termi-
nals.
Defective upper
paper switch.
(34)
No develop-
ing bias is
output.
(35)
The original
size is not
detected.
(36)
The original
size is not
detected cor-
rectly.
(37)
The touch
panel keys do
not work.
(38)
The message
requesting
paper to be
loaded is
shown when
paper is
present in the
upper drawer.
Check if CN5-B10 on the engine PCB goes
low during copying. If not, replace the engine
PCB.
If the level of CN5-2 on the scanner motor
PCB does not change when the original de-
tection switch is turned on and off, replace
the original detection switch.
Check the original and correct if necessary.
Reinsert the connector. Also check for
continuity within the connector cable. If
none, remedy or replace the cable.
Check if sensor operates correctly. If not,
replace it or, if necessary, the scanner motor
PCB.
Reinsert the connector. Also check for
continuity within the connector cable. If
none, remedy or replace the cable.
If any keys do not work after the touch panel
has been initialized, replace the touch panel
or operation unit main PCB.
Reinsert the connector. Also check for
continuity within the connector cable. If
none, remedy or replace the cable.
Check if CN15-9 on the engine PCB goes
low when the upper paper switch is turned
on with 5 V DC present at CN15-7 on the
engine PCB. If not, replace the upper paper
switch.
Problem Causes Check procedures/corrective measures
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