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6-1
6. Troubleshooting
6-1 Logic Section
6-1-1 Power Failure
Check the signal path from the battery
terminal to Q110 source, R185,
R115 & Q102.
Check U105, R188, C165 & R112
and its neighboring circuits.
Check Q104 and its neighboring
circuits.
Check U201 and its neighboring
circuits.
Press & hold button
Q110 Drain=‘H’?
U104 pin9p=‘H’?
Q104 collector=‘L’?
U201 pin 1 output
=3.0V?
END
Yes
Yes
No
Yes
No
Yes
No
No
END/