VI
- 7
1
Yes
Failure in static-
charge eliminator
Is there any dirt on the static-charge eliminator?
Clean the static-charge
eliminator.
I-5
Polka dots
Possible cause
Step
Check
Result
Remedy
Dirt on the
transfer roller
2
Is there continuity between the static-charge
eliminator and the chassis?
Yes
Ensure the grounding of the
static-charge eliminator.
Static-charge
eliminator
grounding failure
3
Does print quality improve when the transfer
roller is replaced?
Yes
Clean the transfer roller [Use dry
lint-free paper (producing little
paper dust) to clean the transfer
roller. Never use solvents] and,
if the dirt remains, replace the
transfer roller assy.
1
Yes
Dirt on the
PF guide
Is there any dirt on the back of the paper feed
guide and the jam remove cover near the static-
charge eliminator?
Clean the PF guide or the
jam remove cover.
I-6
Dirt on back of paper
Possible cause
Step
Check
Result
Remedy
Dirt on the
transfer roller
2
Open the toner cartridge lid in the printer, pull
out the EP-ED cartridge and remove the paper
in the printer. Is there already dirt on the back
of the sheet thus removed?
No
Go to Step 6.
-
3
Is there any dirt on the transfer roller?
Yes
Clean the transfer roller and,
if the dirt remains, replace
the transfer roller assy.
Transfer input
signal error
4
Does the voltage at the 6 pin (HVT1) of the
connector P6 on the main PCB change from
9V to 0V for about 0.8 seconds?
Yes
Replace the main PCB assy
or the harness.
5
No
Dirt on power
supply terminal
Clean the transfer roller right end bearing, the
check continuity between the transfer roller
power supply spring and the terminal of the
high-voltage transfer unit. Is there continuity?
Clean the contact to assure
the continuity.
Failure in the
transfer high-
voltage circuit
Replace the high-voltage
power supply PCB assy.
No
Dirt the fixing
guide
Is there any dirt on the fixing unit inlet guide?
6
Clean the fixing unit inlet
guide.
Yes
Fixing roller
grounding failure
Are the upper and lower rollers of the fixing
unit securely connected to the chassis via the
diode?
7
Ensure the grounding.
No
Replace the fixing unit.
Yes
Fixing unit failure
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 ...
