Brother CS8000 Series - The workspace does not light.

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Failure Investigation for Electronic Parts The workspace does not light.
The workspace lamp does not light.
Are the operate PCB assy. and LED
lamp SR assy. correctly connected?
N
Y
Are the main PCB assy. and LED
lamp SL assy. correctly connected?
N
Y
Are the main PCB assy. and opetate
PCB assy. correctly connected?
N
Y
Replace power PCB assy.
Reconnect the operate PCB assy.
and LED lamp SR assy. correctly
Reconnect the main PCB assy.
and LED lamp SL assy. correctly
Reconnect the main PCB assy.
and operate PCB assy. correctly
Is the voltage across pins 4-3 of
the power PCB assy. output
connector 26V DC?
N
Y
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