Boost Regulator Board (12V Pa Only) - Tait TB8100 Service Manual

8.13

Boost Regulator Board (12V PA Only)

Task 1 —
Check Output
Voltages
Task 2 —
Check Power Saving
Operation
Task 3 —
Check Alarms
168 Power Amplifier Fault Finding
These checks will verify that:
the DC output voltages are correct
Power Saving operation is correct.
Figure 8.15 on page 169
Figure 8.16 on page 169
regulator board. The circled numbers in the following instructions refer to
Figure 8.16.
1. If you have not already done so, remove the cover as described in
"Power Amplifier Disassembly and Reassembly" on page
2. Set up the test equipment as shown in
PA.
3. Check that the output voltages from the boost regulator board are as
listed below:
b
output to reciter:
c
output to 6W board:
d
output to 60W board:
If the voltages are correct, go to
the boost regulator board.
This will check that the boost regulator board operates correctly in Power
Saving mode.
1. Short pins 1 and 2 of J1
are as listed below:
b
output to reciter:
c
output to 6W board:
d
output to 60W board:
If the voltages are correct, go to
the boost regulator board.
Note
Power Saving mode does not shut down the reciter output. It also
does not isolate the 60W board output from the input. Any volt-
age present on the input will appear on the output to the 60W
board.
1. Set up the test equipment as shown in
ment set-up for initial checks - 28V PA" on page
2. Run the Service Kit and connect to the base station.
1. 0.5V lower than the input voltage.
shows the recommended test equipment set-up.
shows the location of the test points on the boost
Figure 8.15
12VDC
28VDC (approximately)
28VDC (approximately)
Task 2. If they are incorrect, replace
e
together and check that the output voltages
12VDC
0VDC
12VDC
Task 3. If they are incorrect, replace
"Recommended test equip-
© Tait Electronics Limited September 2006
173.
and power up the
1
(approximately)
1
(approximately)
1
(approximately)
134.
TB8100 Service Manual