Failure Investigation For Electronic Parts - Brother PE770 Service Manual

5
Failure Investigation
for Electronic Parts
* Perform resistance measurements after turning off the power, and detaching the
connectors to be measured from the PCB.
Error message list ............................................................ 5 - 2
The power does not come on........................................... 5 - 3
Pulse motors do not return to starting position................. 5 - 5
The touch panel does not work ........................................ 5 - 6
LCD backlight does not come on ..................................... 5 - 7
Main motor does not turn ................................................. 5 - 8
Main motor rotation abnormal ........................................ 5 - 10
Cannot sew pattern correctly.......................................... 5 - 11
Thread tensioning is not correct ..................................... 5 - 12
Thread cutter does not work normally ............................ 5 - 13
Bobbin winding cannot be done ..................................... 5 - 14
Lamp does not come on................................................. 5 - 15
Bobbin thread detection does not work normally ........... 5 - 17
Upper thread sensor does not work normally................. 5 - 18
Card cannot be used normally ....................................... 5 - 19
USB cannot be used normally........................................ 5 - 20
Embroidery unit does not operate normally.................... 5 - 21
Error is displayed............................................................ 5 - 24
Replacement of main PCB assy or motor PCB assy ..... 5 - 27
Correspondence table of "Model" and "Printed-circuit board"...... 5 - 28
5 - 1