Brother DP-550CJ, Service Manual

Page: 72 / 194

REPAIR
SERVICE MANUAL
Troubleshooting
3-9
Points to Check Probable Cause Corrective Action Repair
Is these wear or damage to the
ink cartridge head locker, spring,
or carriage assembly? Head locker or spring
worn or damaged:
dirty, worn, or
damaged gold-plated
contacts the printer flat
cable. Remove the cartridge
and clean the
contacts on the flat
cable in the carriage;
Replace the carriage
mechanism. Replace spring,
head locker, or
printer flat
cable.
(3) Maintenance Station:
Is the wiper loose or worn?
Defective wiper Replace wiper.
Is the cap worn or loose? Defective cap Replace cap.
Is the spring-loaded MS carriage
moving freely? Obstructions in
carriage path; spring
broken or loose; MS
carriage out of tracks. Remove obstructions,
realign carriage on
tracks, or replace MS
assembly. Replace spring
or MS
assembly.
(4) Paper/Line Feed:
Are there any obstruction in the
paper path?
Paper jam Clear paper path.
Is the correct type of paper in
the machine? Wrong paper (weight,
size) Try correct paper.
Are star-wheels binding? Star-wheels dirty,
worn, or dislodged. Replace star-wheel
assembly.
Is the main roller assembly
rotating properly? Worn or broken gears,
bearing, defective line
feed motor? Replace main roller
assembly. Replace gears,
bearing, and/or
motor.
Does not the line/paper feed
motor rotate normally? See Problem 6, Line
Feed Motor.
Does the sheet lead edge
contact the frist print roller? Paper jam, incorrect
paper wt./type; worn
main shaft rollers Clear paper path,
install proper wt./type
paper. Replace main
shaft rollers.
Are the drive gears working
properly? Worn, misalign, or
damaged gears. Replace the gear
holder assembly
and/or the main shaft
gear.
(5) Color Print (Check Items 1-4
above)
With a color cartridge properly
installed, will the system display
a color selection dialog box, and
then print the file in the color
selected?
If no, color detection
circuit (Main PCB) is
defective. Replace the Main
PCB. Replace D3,
ZD3, Q16, #8.
Run the Self-test color print test
1 (#2 from the SELF TEST
MENU). After eliminating items
1-4 (same as
monochrome print),
defective Main PCB. Replace the Main
PCB.