Ink Splash; Print Edges Not Aligned; Random Missing Dots - Brother MFC5490CN Service Manual

Problem

(7) Ink splash

(8) Print edges not aligned

(9) Random missing dots

Printer
• Perform the purge operation (Function code 76) several times to
remove dust or air bubbles from its nozzles. (Refer to
Section 9.4.24.)
• Check the ink cartridges. Any of them has run out of ink or the ink
viscosity has been increased, so replace it.
• Check the head property data (Refer to
• Check that the main drain tube is not bent.
• Replace the head/carriage unit.
• Replace the main PCB.
• Replace the power supply PCB.
• Replace the maintenance unit.
Printer
• Check the alignment of vertical print lines with Function code 65 in the
maintenance mode. (Refer to
• Perform the print head skew compensation with the head skew adjuster
knob. Refer to Chapter 7, Section 7.2, [ 4
• Check the head/carriage unit.
• Check the CR encoder strip for stains or scratches. (If the CR encoder
strip is not hooked properly, correct it.)
• Correct the positioning error of the head/carriage unit. (Refer to
Chapter 7, Section 7.2, [ 4
• Check the height adjustment mechanism of the head/carriage unit
(Refer to Chapter 3, Section
• If the "head-platen gap offset" is enabled with assurance mode switch
AMS 02 (Function code 88), align the vertical print lines (Function
code 65). (Refer to Chapter 9, Sections 9.4.28 and
Printer
• Perform the purge operation (Function code 76) several times to
remove dust or air bubbles from its nozzles. (Refer to
Section 9.4.24.)
• Check the ink cartridges. If any cartridges have run out of ink, replace
them.
• Check that the carriage-head flat cable is connected to the carriage
PCB.
• Replace the head/carriage unit.
• Check the connection of the head flat cables on the main PCB. (If
either of those cables is broken or damaged, replace it.)
• 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.
4-38
Action to be taken
Chapter 9, Section
Chapter 9, Section
].
].)
3.2.2.3.)
Chapter 8, Section 8.2
Chapter 9,
9.4.20.)
9.4.18.)
9.4.18.)
Chapter 9,
Confidential