Led Pointer Does Not Light - Brother PR655 Service Manual

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Failure Investigation for Electronic Parts
Is the attached frame usable for the
LED pointer?
Is the LED pointer setting turned ON?
Is the lead wires of the light source
assy correctly connected to the lead
wire assy LED?
When the light source assy is replaced
with a new one, does it light normally?
When the lead wire assy LED is
replaced with a new one, does it light
normally?
Is the voltage between pins 3 and 4 of
the connector CN26 on the main PCB
23 to 27V, when the power is turned
ON?

LED pointer does not light

LED pointer does not light.
Y
Y
Y
N
N
Y
Replace the main PCB.
5 - 24
N
Attach a frame usable for the
LED pointer.
N
Turn the LED pointer setting
ON.
N
Connect it properly.
Y
Replace the light source
assy.
Y
Replace the lead wire assy
LED.
N
Replace the power supply
unit.

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