Brother MFC5490CN - Dark; Light

4-37
Confidential
Problem Action to be taken
(4) Light At the scanner
Check the following components:
- Scanner cover (CIS unit)
-Main PCB
At the printer
Check the following components:
- Ink cartridges
- Head/carriage unit and carriage PCB ASSY
-Main PCB
- Power supply PCB
- Head property data (Refer to Chapter 9, Section 9.4.20.)
- Maintenance unit
(5) Dark At the scanner
Check the following components:
- Scanner cover (CIS unit)
-Main PCB
At the printer side
• Perform the purge operation (Function code 76) several times to
remove dust or air bubbles from its nozzles. If the problem persists,
replace the head/carriage unit. (Refer to Chapter 9, Section 9.4.24.)
Check the following components:
- Ink cartridges
- Head/carriage unit and carriage PCB ASSY
-Main PCB
- Power supply PCB
- Head property data (Refer to Chapter 9, Section 9.4.20.)
- Maintenance unit
(6) Straight or blurred, black or
white, vertical stripes
Scanner
Check the following components:
- Scanner cover (CIS unit)
- Scanner glass
Printer
• Check whether paper is coming into contact with any components
other than the ones it should during ejecting.
• Check the CR encoder strip for stains or scratches. (If the CR encoder
strip is not hooked properly, correct it.)