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Flow Chart of Troubleshooting
PHONE Part
Phone ON
NG
1pin in U404
= High
NO
4pin in U407
= High
YES
2pin in U407
=High
YES
Output Powers
in U604 OK?
YES
Check UCP201 & TCX101
Neighboring Circuits
YES
Check UME401 &
Neighboring Circuits
NO
NO
NO
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1pin in U407
= High
YES
Check U407
Check U204
Check U204
Neighboring
Circuits
7-4
Check U204
NO
Neighboring
Circuits
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