As advised, I replaced the overheating filter capacitor in my TEN TEC 960
power supply along with all of the 4 other electrolytics on the main circuit
board and now the power supply is like new.no more overheating or burning
smell. On removal, I discovered that the filter capacitor was starting to
leak around the ground side mounting bolt which was partially fused around
the threads making it somewhat difficult to get out.
I replaced the original 47,000 uF, 40V filter capacitor with a 50,000 uF, 75
V unit that was exactly the same dimensions as the original (2-1/2" dia. X
4-1/8" tall, and 1-1/8" pin spacing). As it turns out the PCB pads are
plenty large with sufficient room around the capacitor on the TT-960, that
you could probably drill a new hole if needed to accommodate a different
size capacitor. Also good news, I only needed to partially disassemble the
power supply in order to gain sufficient access to the underside of the main
circuit board to allow removal of the filter capacitor mounting bolts. This
did not require having to unsolder and of the heavy transformer leads or
components other than the capacitors. The only other thing I needed in
addition to the capacitors was a small tube of heat sink thermal paste for
the large 4-terminal rectifier that is bolted to the chassis.
I had to order filter capacitor through eBay as many suppliers in the U.S.
would not ship directly to Canada. The shipment arrived in 4 days from
Hauppauge NY which I thought amazing.
With the main PCB only partially removed I was able to access and replace
all of the electrolytic capacitors while I was at it, even though the other
caps on the board appeared to be OK.
Original capacitors on the main board were as follows;
47,000 uF, 40V Large Can Filter Capacitor (1)
4700 uF, 35V (1)
220 uF, 16V (1)
33 uF, 35V (1)
4.7 uF, 50V (1)
Overall the repair was relatively easy, and I am pleased with the results.
73,
Rick VE3ORY
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