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Receiver low voice or no voice
Replace the
receiver.
Receiver is low.
Set the phone as
handsfree mode
YES
Check if the receiver
YES
is broken or damaged
NO
Test if there's sound from
receiver with multimeter
YES
Measure the signal
with oscillograph
under calling mode
NO
Replace CPU
U0100 SC7710
END
IQ449 service manual
NO
Replace receiver
NO
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