Brother PE770 Service Manual page 11

5. Failure Investigation for Electronic Parts .........................................5 - 1
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
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
6. Repair Manual .....................................................................................6 - 1
7. Special Instructions of Wiring ...........................................................7 - 1
Needle bar module wiring ..................................................................................7 - 2
Rotary hook module wiring ................................................................................7 - 5
Motor PCB assembly wiring ...............................................................................7 - 6
Front cover assembly wiring ..............................................................................7 - 9
Embroidary unit assembly wiring .....................................................................7 - 10
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