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VI - 12
Does the upper cover hook press the actuator
of the interlock switch on the main PCB
correctly when upper cover is closed?
Possible cause Step Check Result Remedy
Upper cover 1 No
Replace the upper cover assy.
"12 COVER OPEN" is displayed even if the upper cover is closedM-6
Yes
Replace the main PCB assy.
Main PCB
Possible cause Step Check Result Remedy
1
Control panel
PCB
Switch flat cable
Main PCB
Yes
No
Replace the Main PCB assy.
Mis-operation Are the switchs operated according to the
operation manual?
Operate the switches
correctly following the
operation manual.
Switch
2
When a switch is pressed,does the voltage of
the following signals change from 5V to 0V?
Signal
SW8(SEL)
SW7(MODE/EMULATION)
SW6(FONT/ECONOMY)
SW5(FORM FEED/FEEDER)
SW4(SET/COPY)
SW3(CONTINUE/SHIFT)
SW2(DOWN/RESET)
SW1(UP/TEST)
Main PCB
P1-8
P1-10
P1-12
P1-14
P1-16
P1-18
P1-20
P1-21
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Panel PCB
P1-14
P1-12
P1-10
P1-8
P1-6
P1-4
P1-2
P1-1
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No
Replace the control panel
unit or the switch flat cable.
Malfunction of control panel switches.M-4
Is the "Buzzer on mode "selected according
to the operation manual?
(To alternate the buzzer on/off mode selection,
press the MODE switch and select the
"Advanced mode".)
Check the buzzer signal with a oscilloscope.
Is the pulse of 4KHz output?
Possible cause Step Check Result Remedy
Operational
error
1 No Set the buzzer on mode.
2
No
Replace the main PCB assy.
Malfunction of buzzerM-5
Yes
Replace the main PCB assy.
Main PCB
Buzzer