Brother International HL 1850 Service Manual - Page 218

Downward, fogging, solid, black, Horizontal, lines

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CHAPTER 6 TROUBLESHOOTING 1-20 • Downward fogging of solid black Possible cause Toner cartridge failure High-voltage power supply PCB failure Step Check 1 Is the problem solved after replacing the toner cartridge? 2 Is the problem solved after replacing the high-voltage power supply PCB? Result Remedy Yes Replace the toner cartridge. Yes Replace the high-voltage power supply PCB. 1-21 Horizontal lines Possible cause Paper feed roller Paper cassette contacts Step 1 2 Check Are the feed roller shaft and the ground contact connected correctly? Are the ground contacts on the back side of the paper cassette connecting correctly? Result Remedy No Check the connection between the shaft and the ground contact. Also check the ground contact on the back of the feed roller. No Clean the contacts. Ground contacts (7) 6-52

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CHAPTER
6
TROUBLESHOOTING
1-20
Downward
fogging
of
solid
black
•
Possible
cause
Step
Check
Result
Remedy
Toner
cartridge
failure
1
Is
the
problem
solved
after
replacing
the
toner
cartridge?
Yes
Replace
the
toner
cartridge.
High
-voltage
power
supply
PCB
failure
2
Is
the
problem
solved
after
replacing
the
high
-voltage
power
supply
PCB?
Yes
Replace
the
high
-voltage
power
supply
PCB.
1-21
Horizontal
lines
Possible
cause
Step
Check
Result
Remedy
Ground
contacts
Paper
feed
roller
1
Are
the
feed
roller
shaft
and
the
ground
contact
connected
correctly?
No
Check
the
connection
between
the
shaft
and
the
ground
contact.
Also
check
the
ground
contact
on
the
back
of
the
feed
roller.
Paper
cassette
contacts
2
Are
the
ground
contacts
on
the
back
side
of
the
paper
cassette
connecting
correctly?
No
Clean
the
contacts.
(
7
)
6-52