TM8100/TM8200 Service Manual CODEC and Audio Fault Finding 409© Tait Electronics Limited November 200713.3 No Speaker Audio at Auxiliary ConnectorIntroduction This section covers the case where the receiver operates normally but thereis no speaker audio at the auxiliary connector. In other words, there is nosignal at pin 13 (AUD TAP OUT) of the connector. The fault-diagnosisprocedure comprises two tasks:■ Task 8: check signal from CODEC■ Task 9: check LPF and buffer amplifier in CODEC circuitryThese tasks need to be followed by those of “Faulty Modulation UsingAuxiliary Connector” on page 420 if there is also a fault with the transmitmodulation using the auxiliary connector.Figure 13.5 Circuitry in the vicinity of the internal-options connector SK102 (top side)Internal-optionsconnector
