Codec And Audio Fault Finding; Cctm Commands - Tait TM9100 Service Manual

13

CODEC and Audio Fault Finding

This section covers the diagnosis of faults in the CODEC and audio
Fault Conditions
circuitry. There are five conditions that indicate a possible fault in the
circuitry:
In the first case regarding the speaker audio, the green
operating correctly and all unmute criteria will be satisfied. In the second
case the receiver will be operating normally. In the third case the assumption
is that the receiver and power-supply circuitry were checked and no faults
were found. In the fourth case regarding the transmit modulation, the radio
will be transmitting the correct amount of RF power. In the fifth case the
transmitter will be operating normally.
The procedures for diagnosing the above faults are given below in the
Fault-Diagnosis
Procedures
following sections. In each case, however, first carry out the tasks of
Supplies" on page
auxiliary connector can both occur at the same time. In this case carry out
both
Modulation Using Auxiliary Connector" on page
The CCTM commands required in this section are listed in

CCTM commands

Full details of the commands are given in
Mode (CCTM)" on page
Table 13.1 CCTM commands required for the diagnosis of faults in the CODEC and audio circuitry
Command Description
21 Unmute received audio
32 Set radio in receive mode
33 Set radio in transmit mode
110 x Set level x (in range 0 to 255) of audio volume
323 x y Generate audio tone
324 x y Output audio signal at tap point x of tap type y to
400 x Select channel with channel number x
TM9100 Service Manual
© Tait Electronics Limited August 2005
no speaker audio or speaker audio is distorted
no speaker audio at auxiliary connector
receiver does not operate
no transmit modulation or modulation is distorted
no transmit modulation despite modulation at auxiliary connector
372. Also note that the conditions concerning the
"No Speaker Audio at Auxiliary Connector" on page 382
112.
at tap point x of tap type y
AUD TAP IN
LED will be
STATUS
394.
Table
"Computer-Controlled Test
AUD TAP OUT
CODEC and Audio Fault Finding
"Power
and "Faulty
13.1.
371