VI
- 6
1
Yes
EP-ED cartridge
Does printed image improve when the EP-ED
cartridge is replaced?
Replace the EP-ED cartridge.
I-3
Completely blank
Possible cause
Step
Check
Result
Remedy
Development
input signal
error
2
Do the pins 3, 4 and 5 of the connector?
P6 on the main PCB have the following value
respectively when a sheet of paper is fed from
the MP tray?
P6-3 pin (DBAC) --- Change in voltage from
6V approx. to 0V just when a sheet of paper is
fed from the registration unit.
P6-4 pin (DBDC) --- Change in voltage from
9V approx. to 0V just when a sheet of paper is
fed from the registration unit.
P6-5 pin (DNSTY) --- Change in voltage to
2.5V just when a sheet of paper is fed.
No
Replace the main PCB assy
or the harness.
Failure in power
supply terminal
3
Is there any dirt on the cartridge side
development terminal of the transfer unit and
on the terminal of the high-voltage power
supply development unit? (is there continuity
between them?)
No
Clean the terminal to assure
the continuity.
LD failure
Failure in
development
high-voltage circuit
4
Does print quality improve when the scanner
unit is improved?
Replace the scanner unit or
the harness.
Replace the high-voltage
power supply PCB assy.
Yes
No
1
Yes
Beam detection
error
Is the printer hung up with the PRINT message
remaining on the display even after a printing
when only a copy is printed?
Replace the scanner unit or
the harness.
I-4
All black
Possible cause
Step
Check
Result
Remedy
EP-ED cartridge
2
Does printed image improve when the EP-ED
cartridge is replaced?
Yes
Replace the EP-ED cartridge.
Charging input
signal error
3
Do the pins 1 and 2 of the connector P6 on the
main PCB have the following value respectively
when a sheet of paper is fed from the MP tray?
No
Replace the main PCB assy
or the harness.
Dirt on power
supply terminal
Failure in the
charging high-
voltage circuit
4
Is there any dirt on the cartridge side charging
terminal of the transfer unit and on the terminal of
the high-voltage power supply charging unit?
(is there continuity between them?)
Clean the contact to assure
the continuity
No
P6-1 pin (HV1AC) --- Change in voltage from 6V
approx. to 0V just when a sheet of paper is fed.
P6-2 pin (HV1DC) --- Change in voltage from 9V
approx. to 0V just when a sheet of paper is fed.
LD failure
Yes
Replace the high-voltage
power supply PCB assy and,
if the problem is not resolved,
replace the scanner unit or
the harness.
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 ...
