5 - 9
Failure Investigation
for Electronic Parts
Failure Investigation for Electronic Parts
Cannot sew pattern well
Replace NP PCB-S assy.
Normal patterns are not
generated
When the upper shaft pulley is turned
slowly by hand, does the voltage across
pins 4-1 and pins 5-1 of CN1 (S2) or CN2
(S3) on the main PCB assy. vary 0-5V DC?
N
Adjust the needle-presser
module assembly
N
Replace main PCB assy.
Y
With the power OFF, can the needle bar be
moved to the left and right easily by hand?
Y
Y
Replace pulse motor
N
Is the resistance across pins 1-2 and
pins 3-4 for the Z pulse motor and F
pulse motor connectors 4-6 Ω?
S2 : CS8000 Series
S3 : CS8100 Series
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