278 CODEC and Audio Fault Finding TP9100 Service Manual
© Tait Electronics Limited May 2005
12.3 No Audio Tap Out at Accessory Connector
Introduction This section covers the case where the receiver operates normally but there
is no tap out audio at the accessory connector. In other words, there is no
signal at pin 4 (
AUD TAP OUT) of the connector. The fault-diagnosis procedure
comprises two tasks:
■ Task 7: check signal from CODEC
■ Task 8: check LPF and buffer amplifier in CODEC circuitry
These tasks need to be followed by those of “Faulty Modulation Using
Accessory Audio Tap In” on page 287 if there is also a fault with the
transmit modulation using the accessory connector.
Figure 12.4 Volume potentiometer RV1 and resistor R900 (top side)
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