Brother FS-40 User Manual

5 - 12
Failure Investigation
for Electronic Parts
Main motor rotation is not normal
The rotation of the main motor is unstable.
or
The rotation speed does not reach maximum.
or
The rotation speed can not be adjusted.
Connect it correctly.
Is the main motor connector
connected to the power supply
PCB assy. (CN401) correctly?
Is the power lead wire assy.
connector connected to the power
supply PCB assy. (CN201) and the
main PCB assy. (CN5) correctly?
N
Replace the SSVR PCB assy.
When the speed control lever is
moved with the power ON, does
the voltage between pin 4 and 5 of
CN1 on the SSVR PCB assy. 0.7-
4.2V DC?
N
Y
Attach the main PCB assy.
correctly.
N
Y
Y
Replace the main PCB assy.
Is the main PCB assy. attached
correctly?
(Is the BW switch OFF?)

Brother FS-40 Specifications

General

Brand	Brother
Model	FS-40
Category	Sewing Machine
Language	English