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Trouble Shooting Guide, Advanced
Mic – AFMS:
The input signal is taken from the microphone pads (X830).
The signal is amplified, passes a TX filter (band pass 300- 3400 Hz) and connects through the
side tone switch to the RX part.
In the RX part the signal passes an RX filter (band pass 300- 3400 Hz), then it is amplified and
connected to the AMFS pin (pin 1) of the system connector.
ATMS – PCM – AFMS:
The input signal is taken from the ATMS pin (pin 2) of the system connector.
The signal passes a TX filter (band pass 300- 3400 Hz) and is AD converted in N800.
The data is sent as PCM code through PCMULD to D900 where the signal is speech coded.
The signal is fed back in reverse order, speech decoded in D900, send back through PCMDLD
to be DA converted in a PCM decoder and filtered in N800.
The signal is amplified and then connected to the AMFS pin (pin 1) of the system connector.
ATMS – CPU – AFMS:
The input signal is taken from the ATMS pin (pin 2) of the system connector.
The signal passes a TX filter (band pass 300- 3400 Hz) and is AD converted in N800.
The data is sent as PCM code through PCMULD to D900 where the signal is speech coded.
The speech-coded information is sent to the processor through DSPULD for further coding.
The signal is fed back in reverse order. It is decoded in the processor, sent back to D900 trough
DSPDLD for speech decoding.
Then it is sent to N800, through PCMDLD, for DA conversion in the PCM decoder.
The signal is filtered and amplified, then connected to the AMFS pin (pin 1) of the system
connector.
Mic – CPU – Earphone:
The input signal is taken from the microphone pads (X830).
The signal is amplified, passes a TX filter (band pass 300- 3400 Hz) and is then AD converted
in N800.
The data is sent as PCM code through PCMULD to D900 where the signal is speech coded.
The speech-coded information is sent to the processor through DSPULD for further coding.
The signal is fed back in reverse order. It is decoded in the processor, sent back to D900 trough
DSPDLD for speech decoding.
Then it is sent to N800, through PCMDLD, for DA conversion in the PCM decoder.
The signal is filtered and amplified, then connected to the earphone connector (J900) trough
BEARM.
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