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6.Voice can't be transmitted to other party.
Check the handset MIC
sensitivity.
OK
Check the handset TX AF
circuit (around PIN1-11 of
HU7 and HU5C).
At the MIC of the handset,
NG
does the bias voltage exist.
OK
Check the base RX TEL-
Line out.
OK
Check the base RX
sensitivity.
OK
The handset MIC is
defective.
20
Check the base RX RF
NG
circuit and mixer circuit
(around BQ8).
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