Completely Blank; Random Color; All Black - Brother MFC5490CN Service Manual

Problem

(1) Completely blank

(2) Random color

(3) All black

At the scanner
Check that the document is placed facing in the correct direction.
In ADF scanning, is the document placed face up in the document tray?
In flat-bed scanning, is the document placed face down on the scanner
glass?
Check the following components:
- Scanner cover (CIS flat cable)
- Main PCB
At the printer
• Check the ink cartridges. If any cartridges have run out of ink, replace
them.
• Perform a head cleaning operation.
• Check the connection of the head flat cables on the main PCB. (If
either of those cables is broken or damaged, replace it.)
• Check the head property data. (Refer to
• Replace the head/carriage unit.
• Replace the main PCB.
• Clean the head caps and wiper of the maintenance unit with a Rubycel
stick. For the cleaning procedure, refer to
"CLEANING THE MAINTENANCE UNIT."
• Replace the maintenance unit.
• Check that the drain tubes are not bent.
At the scanner
Check the following components:
- Scanner cover (CIS flat cable)
- Main PCB
At the printer
Check the following components:
- Head/carriage unit and carriage PCB ASSY
- Main PCB
4-36
Action to be taken
Chapter 9, Section
Chapter 8, Section 8.2
9.4.20.)
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