[BC] Sick PCL-606C

[Xmitters at aol.com]

Hello:

I had to temporarily power down my STL transmitters last night to bypass the 
UPS. Upon powerup, one of my STL transmitters refused to go back to the 
Radiate mode. Same problem on the dummy load. The multimeter shows that all of the 
power supply voltages, but one of the first RF stages (don't remember what it's 
called ) showed zero. All other RF stages showed Zero. The Radiate/Standby 
switch made no difference.

I've done a great deal of component level troubleshooting and I would like to 
open this thing up to see what went wrong. I don't want to re-invent the 
wheel, so I'm wondering if any of you have seen this problem before?

Unfortunately, the STL transmitter room is very hot most of the time, as in 
around 90 to 100 deg F. My guess is that there is probably a bad electrolytic 
in the system somewhere that's causing the system to go into foldback 
immediately on power-up, just as a guess.

BTW, this PCL-606C is about 10 years old so it's approximately the age of 
requiring a capacitorectomy :-)

All of my other STL transmitters are fine, and we are currently on the air 
with our backup STL system. No hurry :-)

Is there anything specifically that you've seen before that commonly causes 
these symptoms?

Moseley is not open yet, so I'll have to wait to pick their brain on this, 
and hopefully order out a loaner PC-606C transmitter.

Thanks for anything you could suggest that would make the bench 
troubleshooting chore just a bit more direct to the problem :-)


Jeff Glass, BSEE CSRE
WNIU WNIJ
Northern Illinois University
Dell 2650 Win2000 AOL 7.0


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