382 CODEC and Audio Fault Finding TM9100 Service Manual
© Tait Electronics Limited August 2005
13.3 No Speaker Audio at Auxiliary Connector
Introduction This section covers the case where the receiver operates normally but there
is no speaker audio at the auxiliary connector. In other words, there is no
signal at pin 13 (
AUD TAP OUT) of the connector. The fault-diagnosis
procedure comprises two tasks:
■ Task 8: check signal from CODEC
■ Task 9: check LPF and buffer amplifier in CODEC circuitry
These tasks need to be followed by those of “Faulty Modulation Using
Auxiliary Connector” on page 394 if there is also a fault with the transmit
modulation using the auxiliary connector.
Figure 13.5 Circuitry in the vicinity of the internal-options connector SK102 (top side)
Internal-options
connector
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