5 ] Print-Image Related; Components - Brother MFC4820C Service Manual

[ 5 ] Print-image related
If the received or sent image has any problem, first make a copy with the facsimile equipment.
If the copied image is normal, the problem may be due to the remote terminal; if it is abnormal,
proceed to the following checks:
Trouble
(1) Completely blank
(2) Random color
(3) All black
At the scanner
Check the following components:
- CIS flat cable
- Main PCB
- CIS unit
At the printer
• Check the ink cartridges. If any cartridges have run out of ink,
replace them.
• Check the connection of the head flat cables on the main PCB
and print head PCB.
• Replace the needle tube & head flat cable ASSY.
• Replace the main PCB.
• Clean the head caps and wiper of the purge unit with a
Rubycel stick. For the cleaning procedure, refer to "Cleaning
the purge unit" given on page 8-22.
At the scanner
Check the following components:
- CIS flat cable
- CIS unit
- Main PCB
At the printer
Check the following components:
- Print head unit
- Main PCB
- Carriage ASSY
8 -1 7
Action to be taken