
TP9100 Service Manual
CODEC and Audio Fault Finding
279
© Tait Electronics Limited
May 2005
Task 7 —
Check Signal
from CODEC
First generate an appropriate audio test signal and check whether the signal
is present at the output of the CODEC circuitry.
1.
Enter the CCTM command
400
x
, where
x
is a valid channel number.
(A suitable channel will depend on the programming of the radio.)
2.
Enter the CCTM command
21
to force unmuting of the received
audio signal.
3.
Enter the CCTM command
110 128
to set the audio level at its
midpoint.
4.
At the test set apply 60%, 1 kHz modulation to the RF signal.
Reduce the volume to a minimum.
5.
Enter the CCTM command
324 r5
.
6.
Check the received signal is present at pin 4 of connector
PL1
(see
). The signal should be:
7.
If the signal is correct, the fault is with PL1 or the accessory flex
connector. Refer to
“Accessories Interface Faulty” on page 147
for
accessory connector service instructions. If the signal is not correct go
to
8.
Check the received signal is present at the junction of
E900
and
C909
(see
). The signal should be:
9.
If the signal is correct go to
. If it is not, go to
.
10.
Check the soldering and components around
PL1
,
E900
, and
C909
(see
). Repair any fault.
11.
Confirm the removal of the fault and go to
. If the repair failed
or the fault could not be found, replace the main board and go to
.
12.
If there is also a fault with the transmit modulation, notwithstanding
modulation at the accessory connector, go to
. If there is no
other fault, go to
pin 4 of PL1: received signal with 1.2V DC offset
junction of E900 and C909: received signal with 1.2V DC offset
Содержание TP9100
Страница 1: ...TP9100 portables Service Manual MPA 00005 01 Issue 1 00 May 2005 ...
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Страница 11: ...TP9100 Service Manual 11 Tait Electronics Limited May 2005 TP9100 portables Chapter 1 Description of the Radio ...
Страница 74: ...74 Circuit Descriptions TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 75: ...TP9100 Service Manual 75 Tait Electronics Limited May 2005 TP9100 portables Chapter 2 Servicing the Radio ...
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Страница 100: ...100 General Information TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 126: ...126 Disassembly and Reassembly TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 148: ...148 Interface Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 158: ...158 Power Supply Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 250: ...250 Transmitter Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 268: ...268 Receiver Fault Finding TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 292: ...292 Spare Parts TP9100 Service Manual Tait Electronics Limited May 2005 Figure 13 1 Serviceable parts 3 3 3 4 4 3 4 ...
Страница 294: ...294 Spare Parts TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 295: ...TP9100 Service Manual 295 Tait Electronics Limited May 2005 TP9100 portables Chapter 3 Accessories ...
Страница 298: ...298 Antenna Identification Chart TP9100 Service Manual Tait Electronics Limited May 2005 ...
Страница 306: ...306 TPA CH 001 Single Battery Charger TP9100 Service Manual Tait Electronics Limited May 2005 15 6 5 Circuit Diagram ...