Brother HL 2060 - B/W Laser Printer Service Manual page 89

I-5 Polka dots
Possible cause Step
Failure in static- 1
charge
eliminator
Static-charge 2
eliminator
grounding
failure
Dirt on the 3
transfer roller
I-6 Dirt on back of paper
Possible cause Step
Dirt on the 1
PF guide
2
Dirt on the 3
transfer roller
Transfer input 4
signal error
Dirt on power 5
supply terminal
Failure in the
transfer high-
voltage circuit
Dirt the fixing 6
guide
Fixing roller 7
grounding
failure
Fixing unit
failure
Check
Is there any dirt on the static-charge
eliminator?
Is there continuity between the static-charge
eliminator and the chassis?
Does print quality improve when the transfer
roller is replaced?
Check
Is there any dirt on the back of the paper feed
guide and the jam remove cover near the
static-charge eliminator?
Open the toner cartridge lid in the printer, pull
out the EP-ED HC cartridge and remove the
paper in the printer. Is there already dirt on
the back of the sheet thus removed?
Is there any dirt on the transfer roller?
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?
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?
Is there any dirt on the fixing unit inlet guide?
Are the upper and lower rollers of the fixing
unit securely connected to the chassis via the
diode?
VI-7
Result Remedy
Yes Clean the static-charge
eliminator.
Yes Ensure the grounding of
the static-charge
eliminator.
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.
Result Remedy
Yes Clean the PF guide or the
jam remove cover.
No Go to Step 6.
Yes Clean the transfer roller
and, if the dirt remains,
replace the transfer roller
assy.
No Replace the main PCB
assy or the harness.
No Clean the contact to
assure the continuity.
Yes Replace the high-voltage
power supply PCB assy.
Yes Clean the fixing unit inlet
guide.
No Ensure the grounding.
Yes Replace the fixing unit.