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

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Confidential
Problem Action to be taken
(7) Ink splash Printer
• Perform the purge operation (Function code 76) several times to
remove dust or air bubbles from its nozzles. (Refer to Chapter 9,
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 Chapter 9, Section 9.4.20.)
• 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.
(8) Print edges not aligned Printer
• Check the alignment of vertical print lines with Function code 65 in the
maintenance mode. (Refer to Chapter 9, Section 9.4.18.)
• 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 3.2.2.3.)
• 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 9.4.18.)
(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 Chapter 9,
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 Chapter 8, Section 8.2
"CLEANING THE MAINTENANCE UNIT."
• Replace the maintenance unit.