
132
Servicing Procedures
TP9100 Service Manual
© Tait Electronics Limited
May 2005
Task 9 —
Check the Transmit
and Transmit-Audio
Functions
If the radio does not transmit, this can be caused by:
■
the synthesizer not being in lock
■
no or wrong carrier power
■
a faulty speaker (which also serves as the microphone)
■
no modulation
If the cause is already known, go directly to the relevant fault-finding
section.
Caution
Observe the servicing precautions for transmitter
issues listed
1.
Use CCTM command
101 x y 0
to set the transmit frequency to the
bottom of the band.
2.
Use CCTM command
33
to set the radio to transmit mode.
3.
Use CCTM command
72
to read the lock status.
Note
The last value returned (LO2) does not have to be in lock while
transmitting.
4.
If the synthesizer is in lock, go to
. If the synthesizer is not in
lock (one or both of the first two values returned are “0”), repair the
radio as described in
“Frequency Synthesizer Fault Finding” on
5.
Repeat
with the transmit frequency set to the top of
the band.
6.
Use CCTM command
326 1
to set the power level to very low.
7.
Connect a power meter and measure the transmit power.
8.
If the carrier power is correct, go to
. If the carrier power is
not correct, try to re-calibrate the radio.
9.
If the re-calibration repairs the fault, go to
If it does not, repair the radio as described in
10.
Repeat
to
with the power level set to high (
326 4
).
11.
Check whether the speaker/microphone is the source of the fault, as
described in
“Internal Speaker/ Microphone Faulty” on page 146
12.
If the radio transmits audio now, the original speaker was faulty.
Reassemble the radio and go to
. If the
radio still fails to transmit, reconnect the original speaker and go to
Содержание TP9100
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Страница 74: ...74 Circuit Descriptions TP9100 Service Manual Tait Electronics Limited May 2005 ...
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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 ...