VK Corporation VG207, Service Manual

Page: 21 / 70

5.2 Melody Trouble
Melody is not heard.
Check the connectivity
of Speaker.
The connection
is OK.
Check the level of SPK+ and
SPK- at J302.
Check whether the
melody signal is out from
pin 12, 14 of U301.
Connect the Speaker to
the phone properly.
Check the VBAT level
from pin 15 of U301.
Replace U301
Check whether the
melody signal is out from
pin 17, 18 of U301.
Check the level from
pin 7, 32 of U301
Level is 2.85V.
Replace U301. Check the U502.
END
YES
NO
NO
NO
YES
YES
YES
NO
Level is 3.0~4.2V?
NO