Gents,
After firing up the TL-922A after a few years of inactivity it worked
fine for a few operating sessions, that is the amp worked as it used to
work, about 1200 watts output in SSB mode.
Then one day I simply tuned the power on and "pop" lights out, no power,
I blew the line voltage fuse (220V). I replaced it and pop again.
I started my research here and elsewhere on the internet and started the
basic triage which included the following:
1. remove the 3-500Zs - fuse still blows, suggesting something in the
power supply circuit
2. remove the HV leads from the transformer going to the rectifier
circuit - fuse no longer blows, suggesting rectifier or electrolytic issues
3. tested the diodes on the rectifier board with a meter and all looked
good, conductivity one way and not in reverse
4. pulled out the stack of 8- 200uf electrolytics and put an ohm meter
across each cap looking for shorts (didn't remove the bleeder resistors
.. i presume this is a viable test .. short trumps resistor right?) and
didn't see any dead shorts
Where do I go next?
Could it be an open electrolytic cap? would that blow a fuse?
I didn't see anything obviously fried or shorted ... all suggestions
appreciated.
Thanks
Ed - WA2MKM
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