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Trouble shooting
5-1
5. Trouble Shooting
5-1 Logic Section
5-1-1 No Power
Press PWR button
END
U408 Pin 5=2.8V?
Check U408 and its neighboring circuits
NO
NO
NO
NO
YES
YES
YES
YES
"H" level outputted
from U406
Pin 2 ?
Check Battery Q407 and its neighboring circuits
NO
NO
NO
YES
YES
YES
YES
U409 Pin 2=2.8V?
Check U409 and its neighboring circuits.
YES
YES
YES
YES
NO
NO
NO
NO
U406 Pin 3=2.8V?
Check U411, U412, U413, U414
and its neighboring circuits.
YES
YES
YES
YES
NO
NO
NO
NO