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Sewing Lamp Does Not Light - Brother SL100 Service Manual

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Failure Investigation
for Electronic Parts

Sewing lamp does not light.

When unplug the foot controller plug
from the socket of the machine, is the
voltage between pins A of the plug 108
to 132V AC? (for 120V AC countries) *
Is the LED lamp assy connecto r
connecte d to the power supply
PCB (CN2) correctly?
When disconnect the LED lamp assy
connector from the power supply PCB
(CN2), is the voltage between pins 1
and 2 at CN2 10 to 12V DC?
Replace the motor 3P supply assy.
Sewing lamp does not light
1
* Refer to Fig. 1.
*1 For 220 to 240V AC countries : 198 to 264V AC
Y
* Refer to Fig. 2.
N
* Refer to Fig. 2.
N
LED lamp lead wire
5 - 2
N
Replace the foot controller.
A
Fig. 1
Y
Connect it properly.
Y
Replace the LED lamp assy.
Power supply PCB
2
CN2
Fig. 2
1

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