150 Power Supply Fault Finding TP9100 Service Manual
© Tait Electronics Limited May 2005
(recreated from default data if necessary). Confirm the removal of the
fault, and go to “Final Tasks” on page 134. If reloading the
programming file failed or failed to repair the fault, replace the main
board, and go to “Final Tasks” on page 134.
6. Check whether the serial cable is correctly connected and try to
reload the software/debug using the CCTM.
If a fault is found, repair it, confirm the removal of the fault, and go
to “Final Tasks” on page 134. If the repair failed or no fault could be
found, replace the main board, and go to “Final Tasks” on page 134.
7. Check for shorts to ground and continuity of the
DIG PSU LATCH signal
from D602 (see Figure 8.2) to the FPGA.
If a fault is found, repair it, confirm the removal of the fault, and go
to “Final Tasks” on page 134. If the repair failed or no fault could be
found, replace the main board, and go to “Final Tasks” on page 134.
The FPGA image needs to be upgraded by the factory.
Figure 8.1 Test and measurement points for the initial checks
bottom side top side
Measurement point at
positive side of C721
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