Brother HL-1660 Series, User Manual

Page: 83 / 448

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