Brother CS8000 Series - Main motor rotation abnormal

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Failure Investigation for Electronic Parts Main motor rotation abnormal
• Is there rotational variance in the main motor?
or
• Does the rotation not reach top speed?
or
• Can the speed not be adjusted?
Replace SSVR PCB assy.
When the power is turned ON and
the speed control lever moved, does
the voltage across pins 2-3 of CN2
(S2) or CN1 (S3) on the operation
PCB assy. vary 0.7-4.3V DC?
N
Replace NP PCB-S assy.
Replace main PCB assy.
When the upper shaft pulley is turned
slowly by hand, does the voltage across
pins 2-1 of CN1 (S2) or CN2 (S3) on
the main PCB assy. vary 0-5V DC?
N
Y
Replace motor PCB assy.
Have parts Q1, Q4, Q5, R1, R2, R4,
R6, D1 or ZD1 on the motor PCB assy.
become discolored or burned?
Y
N
Y
S2 : CS8000 Series
S3 : CS8100 Series
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