I would check the solder connections on the toroids in the PLL section, in
particular, the transformers. Check continuity thru the windings by measuring
from other component leads connected to the pads the toroid leads are soldered
to. If you don't get the toroid leads cleaned and tinned proper
The most sensitive part is almost always the problem part! Try gently
tapping other parts. I've often used the rubber eraser end of a pencil to
make gentle pokes to determine which part is the most sensitive. Sometimes
it's hard to tell!
One thing that can cause this behavior is marginal feedback
... or a short under the can. It's easy to get enough solder up the leads to
contact the can where you can't see it. If there's too much solder, you
could get that symptom. I'd pull the crystal, clean the holes carefully with
solder-wick, and reinstall with attention not to over-use the solder. No
Hi everyone,
Thank you all so much for all your suggestions and advice! It looks
like I have some kind of intermittent fault in my PLL Reference
Oscillator. I've retouched all the solder points in that area incase
it was a cold joint, and after poking around at it for a bit it
suddenly
Stephanie,
One of the high probability places for a solder failure is on the thermistor
board. First thing is to check the 4 volt output - look for 4 volts on RF
Board U6 pin5 - if it is not close to 4 volts, find the solder splash on the
thermistor board. Sometimes you can examine the board by
Hi everyone,
I've just got to the Alignment and Test Part 2 for my K2 and right
off I've hit a problem. I've got the freqency counter probe plugged
into TP3, and I'm in Cal Fctr, but instead of the expected 12090 I'm
getting around 400. It wavers between 398 and 400. The frequency
prob
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