5 ] Print-Image Related - Brother IntelliFax-3550 Service Manual

[ 5 ] Print-image related
If the received or sent image has any problem, first make a copy with the facsimile equip-
ment.
If the copied image is normal, the problem may be due to the remote terminal; if it is abnor-
mal, proceed to the following checks:
Trouble
(1) Completely blank
(2) All black
Action to be taken
At the scanner
Check the following components:
- CCD harness
- Main-sensor harness between the main PCB and the
document sensor PCB
- Main PCB
- Scanner unit
At the printer side
• Clean the high-voltage contacts for the developer roller
on the drum unit, main cover, and high-voltage power
supply PCB. (Contacts 7 in the illustration given on
page VI-20)
• Check the connection of the laser diode harness on the
relay PCB.
• Replace the main PCB.
At the scanner
Check the following components:
- CCD harness
- LED array harness
- Main-sensor harness between the main PCB and the
document sensor PCB
- Scanner unit
- Main PCB
At the printer side
• Clean the high-voltage contacts for the grid and corona
wire on the drum unit, main cover, and high-voltage
power supply PCB. (Contacts 5 and 6 in the illustra-
tion given on page VI-20)
• Check the connection of the relay–high-voltage flat cable.
• Replace the drum unit.
• Replace the main PCB.
VI – 15