LG LSS-3200A Service Manual page 36

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(F) Interrupt check
Logic high is input to IC101(D18)?
YES
Logic high is input to IC101(D20)?
Fig. 08
YES
Logic high is input to IC101(W20)?
Fig. 08
IC101(D18) : No Interrupt signal
NO
Check IC100, IC400
NO
Check IC100, IC800
NO
Check IC100, CN201(7)
3-27

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