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 closed
M-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
---
---
---
---
Panel PCB
P1-14
P1-12
P1-10
P1-8
P1-6
P1-4
P1-2
P1-1
---
---
---
---
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 buzzer
M-5
Yes
Replace the main PCB assy.
Main PCB
Buzzer
Summary of Contents for 1660e - B/W Laser Printer
Page 1: ...MECHANICS ELECTRONICS SERVICE MANUAL LASER PRINTER ...
Page 109: ...Appendix 3 Main PCB Circuitry Diagram 1 7 CODE UK3787000 B48K294 295CIR 1 7 NAME A 3 ...
Page 110: ...Appendix 4 Main PCB Circuitry Diagram 2 7 CODE UK3787000 B48K294 295CIR 2 7 NAME A 4 ...
Page 111: ...Appendix 5 Main PCB Circuitry Diagram 3 7 CODE UK3787000 B48K294 295CIR 3 7 NAME A 5 ...
Page 112: ...Appendix 6 Main PCB Circuitry Diagram 4 7 CODE UK3787000 B48K294 295CIR 4 7 NAME A 6 ...
Page 113: ...Appendix 7 Main PCB Circuitry Diagram 5 7 CODE UK3787000 B48K294 295CIR 5 7 NAME A 7 ...
Page 114: ...Appendix 8 Main PCB Circuitry Diagram 6 7 CODE UK3787000 B48K294 295 CIR 6 7 NAME A 8 ...
Page 115: ...Appendix 9 Main PCB Circuitry Diagram 7 7 CODE UK3787000 B48K294 295CIR 7 7 NAME A 9 ...
Page 116: ...Appendix 10 Control Panel PCB Circuitry Diagram 1 1 A 10 CODE NAME UK2527000 B48K143CIR ...
Page 117: ...Appendix 11 Scanner LD PCB Circuitry Diagram 1 1 A 11 CODE NAME UK2674000 B48K165CIR ...
