Brother HL 5030 - B/W Laser Printer Service Manual page 221

I-21 Horizontal lines
Possible cause Step
Paper feed roller 1
Paper cassette 2
contacts
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?
6-41
HL-5030/5040/5050/5070N SERVICE MANUAL
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)