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Failure Investigation

for Electronic Parts

Failure Investigation for Electronic Parts

The hoop sensor does not function normally.

Change FFC (SML2CD-C).

Is the resistance between each terminal at

both ends 1Ω or below when both ends of the

FFC (SML2CD-C) are removed from the PCB?

Change FFC (SML2CD-Y).

Is the resistance between each terminal at

both ends 1Ω or below when both ends of the

FFC (SML2CD-Y) are removed from the PCB?

Change X area sensor PCB.

Does the machine function normally when the X

area sensor PCB is replaced with a reliable one?

Change hoop sensor and

tune it again.

Does the hoop sensor's lever rotate smoothly

and return to the stopper by the force of its

spring when pressed with fingers?

Change hoop sensor and

tune it again.

Does the resistance between pins 1 and 2, and 2

and 3 of the connector vary from approximately 0

to 1.2kΩ, respectively, as the lever rotates, when

the hoop sensor's lead is removed from the hoop

sensor PCB? Is the resistance between pins 1

and 3 approximately 1.2kΩ?

Change hoop sensor PCB.

Does the machine function normally when the

hoop sensor PCB is replaced with a reliable one?

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Brother PR600 Service Manual

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