The Touch Panel Does Not Work - Baby Lock BLSY Service Manual

Failure Investigation for Electronic Parts The touch panel does not work

The touch panel does not work.

Is the touch panel tuned correctly?
Is the touch panel's FFC properly
connected to connector CN1 on the
card PCB?
Is FFC connected correctly between the main PCB
(CN24) and the card PCB (CN7)? Are the upper
and lower connector locks applied correctly?
Are FFCs connecting the main PCB (CN24)
to the card PCB (CN7) free from breakage?
Is the resistance between pins 2 and
4, and 1 and 3 of the touch panel 330
- 1350Ω, 130 - 540Ω, respectively?
Change main PCB and tune
the touch panel again.
Y
Y
Y
Y
Y
N
Connect it properly.
N
Connect it properly.
N
Connect it properly.
N
Replace the card
assembly.
N
Change touch panel and
tune it again.
PCB
5 - 7