Many thanks Boydk. I have only revisited this thread after some time has passed as I thought it had already come to a natural end. I am overawed by the continued response by everybody and I am extremely thankful to everyone. I have found it interesting but as you suggest, it is way above my understanding in much of the technicalities. Your fix seems to be the good news I was hoping to find. May I ask though, I assume your term the "detector" coil is the same coil they call the discriminator?. If so the manual says it has 2x coils "202" and "204" ?.. Please see the manual page 7. Also I can't find these coils on the board layout on the manual, due to the very poor quality of the image. So I would be most grateful if you could tell me what coil/ coils I should just tweak a tiny amount. Very much obliged
Yes to your Q....... Different terms (depending on what part of the the world) for same function. Discriminator (older)/Detector (newer).
Actually........ Just follow the alignment procedure in #5 of the manual. I assume, you´re qualified to measuere DC millivolts on
the indicated points 😉
Adjust them as equally as possible.
Another not so correct way.
Can I assume, that if you activate the "FM-Mute" circuit, the tuner is silent, when showing the correct frequency, but "open"
when the display shows 50KHz step "misaligned"??
If so, activate FM-mute and manually tune to the correct frequency. Then carefully turn the "202" 1 mm CV or CCW (mark the position before you begin).
If suddenly sound, then done.
If no result, the return the "202" to where it was and do the same with "204" instead. This should give you sound with correct
frequency indicated, Second test: Do some auto tuning, and make sure, it now "locks" correctly.
But still....... First suggestion in manual #5 is the correct one. Tune to your preferred frequency and
measure and adjust as close to 0 volt as possible on the 2 indicated positions.
OR........ even better........ live with it, if your CDO (OCD in alphabetical order) 🤣 allows it.
Actually........ Just follow the alignment procedure in #5 of the manual. I assume, you´re qualified to measuere DC millivolts on
the indicated points 😉
Adjust them as equally as possible.
Another not so correct way.
Can I assume, that if you activate the "FM-Mute" circuit, the tuner is silent, when showing the correct frequency, but "open"
when the display shows 50KHz step "misaligned"??
If so, activate FM-mute and manually tune to the correct frequency. Then carefully turn the "202" 1 mm CV or CCW (mark the position before you begin).
If suddenly sound, then done.
If no result, the return the "202" to where it was and do the same with "204" instead. This should give you sound with correct
frequency indicated, Second test: Do some auto tuning, and make sure, it now "locks" correctly.
But still....... First suggestion in manual #5 is the correct one. Tune to your preferred frequency and
measure and adjust as close to 0 volt as possible on the 2 indicated positions.
OR........ even better........ live with it, if your CDO (OCD in alphabetical order) 🤣 allows it.
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