Brother DCP6690CW Service Manual page 136

Error Code
Symptom
(Hex)
84 Recording paper jam.
(The registration sensor
sticks to ON after
completion of paper
ejection operation.)
85-87 Not used.
88 Recording paper jam.
(Even after paper
pulling-in operation, the
registration sensor is still
OFF.)
Probable Cause
Foreign materials in the
paper path
Registration sensor actuator
caught on the surrounding
parts
Registration sensor actuator
defective
Registration sensor defective Replace the PF encoder/
PF timing belt come off
Paper feed motor defective
The paper ejection roller
does not rotate correctly
Main PCB defective
Outer back cover not closed
correctly
Registration sensor harness
not connected correctly
Bank ASSY deformed
Bank ASSY
Paper tray
Paper pull-in roller Assy
defective
Mode switching lever (at the
right end of CR guide rail)
not sliding smoothly
At the ends of the paper feed
roller shaft, any gear(s)
damaged
Paper feed motor defective
Main PCB defective
4-24
Solution
Remove foreign materials.
Correct the surrounding parts
on which the actuator caught.
Replace the registration sensor
actuator.
registration sensor harness unit.
Set the PF timing belt into
place.
Replace the engine unit.
Replace the main PCB.
Close the outer back cover
correctly.
Correct the connection.
Replace the bank ASSY.
Replace the paper pull-in roller
Assy
Clean the mode switching
lever.
Replace the engine unit.
Replace the main PCB.
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