Figure 13.10 Location Of Test Points On The Ac Converter Board - Tait TB8100 Service Manual

Task 1 —
Check 400VDC Bus

Figure 13.10 Location of test points on the AC converter board

TB8100 Service Manual
© Tait Electronics Limited September 2006
1. Remove the top cover, as described in
Disassembly and Reassembly" on page
2. Connect the correct AC voltage to the input of the PMU and switch
the PMU on.
3. Measure the voltage at the test points on the bottom of the AC
converter board, as shown in
at either PA output on the front panel.
If the test point voltage is 400VDC, but there is no PA output voltage,
replace the HVDC control and microprocessor card and repeat this
task. If the test point voltage is not present, replace the PFC control
card and repeat this task.
If, after replacing one or both cards, the test point voltage is 400VDC
and the PA output voltage is 28.5VDC ±0.2V, go to
on page 247. If the voltages are still incorrect or not present, replace
the AC module and go to
S D G S
Q202 Q201
Figure 13.10. Also measure the voltage
"Final Tasks" on page
Q306 Q305
G D S G D S
400VDC bus
D G
Power Management Unit Fault Finding
"Power Management Unit
249.
"Final Tasks"
247.
bottom side of board shown
241