5.4 Melody Trouble
5-4
Troubleshooting
YES
The connection
is OK?
Melody is not heard.
END
Check the connectivity
of Speaker.
YES
Check whether the
melody signal is out from
Pin 17, 18 of U402?
Connect the Speaker to
the phone properly.
NO
Check the signal level of
SPK+ and SPK-
while the melody
is being played.
Check the level of C416.
Level is VBAT.
Replace U402.
NO
Содержание GSM ST11
Страница 1: ...GSM PHONE SERVICE MANUAL MODEL ST11 ...
Страница 2: ...Rev 1 00 ...
Страница 6: ...1 2 Introduction Memo ...
Страница 15: ...3 4 Exploded View and Parts List 3 4 1 Exploded View 3 5 ...
Страница 41: ...Troubleshooting Memo 5 20 ...
Страница 42: ...6 Block Diagram 6 1 BB Block Diagram 6 1 ...
Страница 43: ...6 2 Block Diagram 6 2 RF Block Diagram ...
Страница 51: ...7 8 Schematic Diagram Memo ...
Страница 52: ...8 PCB Diagram 8 1 Main PCB 8 1 Top View ...
Страница 53: ...8 2 PCB Diagram Bottom View ...
Страница 60: ...9 7 Electrical Parts List Memo ...