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