Brother CE-5500PRW Service Manual page 165

Failure Investigation
for Electronic Parts
Is one of the stitch selection key,
stitch length adjustment key and
stitch width adjustment key stuck in
a pressed down condition?
Is the lead wire of the foot controller
jack assy. free from damage?
Is the foot controller jack assy.
connected to the main PCB assy.
(CN4) correctly?
5 - 4
Error message is displayed
"F3" is displayed.
Y
Release the key that is stuck.
"F4" is displayed.
N
Y
Replace the main PCB assy.
Replace the operation PCB assy.
N
or
Replace the main PCB assy.
Y
Replace the foot controller
jack assy.
N
Connect it correctly.