Tait TB7100, Service Manual

Page: 111 / 370

TB7100 Service Manual Servicing Procedures 113
© Tait Electronics Limited October 2005
4. Switch the T
X
/R
X
switch to the T
X
position and check that the base
station powers up correctly.
■
The LCD indicates the current channel number.
If the transmitter module powers up successfully, go to Task 4 . If it
does not, go to Step 10 .
Check the Receiver
Power Supply
5. Check the fuses, cables, DC power connector (labelled
12VDC
) and
the power supply. A blown fuse must be replaced with exactly the
same type of fuse.
6. Check whether there is power at the DC power connector of the
receiver module. If there is, go to
Step 8 .
7. Check whether there is power at the DC power output connector to
the receiver on the SI board (J102). If there is, replace the receiver
power cable and return to
Step 3 . If not, replace the SI board and
return to Step 3 .
8. Check whether the UI board and cable or the receiver module is
faulty by connecting a UI board and cable to the receiver.
Note
Only the UI cable to the receiver needs to be connected, but
ensure the
T
X
/R
X
switch is set to R
X
.
Tip
Instead of the spare UI board, a TMAC20-0T control head can be
connected to the receiver module.
9. If the receiver module is faulty, go to “Power Supply Fault Finding”
on page 127 . Then return to Step 3 .
Check the
Transmitter
Power Supply
10. Check whether there is power at the DC power connector of the
transmitter module. If there is, go to
Step 12 .
11. Check whether there is power at the DC power output connector to
the transmitter on the SI board (J103). If there is, replace the
transmitter power cable and return to
Step 4 . If not, replace the SI
board and return to Step 4 .
12. Check whether the UI board and cable or the transmitter module is
faulty by connecting a UI board and cable to the receiver and
transmitter.
Note
Both UI cables (to the transmitter and the receiver) need to be
connected, and ensure the
T
X
/R
X
switch is set to
T
X
.
Tip
Instead of the spare UI board, a TMAC20-0T control head can be
connected to the transmitter module only.
13. If the transmitter module is faulty, go to “Power Supply Fault
Finding” on page 127 . Then return to Step 4 .