Tait TB7100 Service Manual

116 Servicing Procedures TB7100 Service Manual
© Tait Electronics Limited October 2005
Task 7 —
Check Tx Power and
Frequency
This task only needs to be carried out if it relates to the fault reported or if
the reported fault is not sufficiently specific to identify the faulty module.
Caution Observe the servicing precautions for the transmit-
ter listed in “Transmitter Issues” on page 81.
1. Set up the test set to measure frequency and power level.
2. Activate the T
X KEY switch on the CTU. (After completing the
measurement, deactivate the T
X KEY switch.)
3. If the transmitter keys up and the measured power level and frequency
match the programmed settings (within the expected accuracy of the
test set and taking into account cable losses), go to Step 6. If it does
not, go to Step 4.
4. If the transmitter does not key up, check whether the SI board and
cable or the transmitter module is faulty by connecting a spare
transmitter module. If the transmitter keys up but the power level or
frequency is incorrect, go to Task 9
.
Tip It is not required to remove the original transmitter module from
the tray chassis. Just unplug the connectors.
5. If the transmitter keys up now, the original transmitter module is
faulty. Reconnect the original transmitter module and go to Task 9
.
Then continue with Step 6.
6. Connect a fist microphone to the P
ROG/MIC connector and press the
PTT key.
7. If the transmitter keys up and the measured power level and frequency
match the programmed settings (within the expected accuracy of the
test set and taking into account cable losses), go to Step 10. If it does
not, go to Step 8.
8. If the transmitter does not key up, check whether the UI board and
cable or the transmitter module is faulty by connecting a spare UI
board and cable to the transmitter and receiver. If the transmitter keys
up but the power level or frequency is incorrect, go to Task 9
.
Note When checking the transmitter module, both UI cables need to
be connected.
Tip Instead of the spare UI board, a TMAC20-0T control head can be
connected to the module.
9. If the transmitter does not key up, the original transmitter module is
faulty. Reconnect the original UI board and cable and go to Task 9
.
Then continue with Step 10.
10. Activate the T
X KEY switch on the CTU or the PTT key on the fist
microphone. The T
X LED should light up.
11. If the T
X LED does not light up, replace the UI board.

Tait TB7100 Specifications

General

Brand	Tait
Model	TB7100
Category	Accessories
Language	English