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 Post subject: National Panasonic RF-100MA no schematic needs alignment
PostPosted: Nov Wed 22, 2017 6:35 pm 
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Joined: Mar Mon 27, 2017 4:29 pm
Posts: 52
I obtained a nice Panasonic in good shape, except the dial does not match up to the frequency (needs alignment). Looking at the trimmers, I saw that the factory marked the original alignment on this model and someone had messed with them. EG 90.9 FM was up around 98 mhz. On AM, the shift was not as bad, but there were some oscillations.

I can't find a schematic for this radio anywhere. I tried empirically adjusting 2 of the FM trimmers and managed to bring 90.9 back to its proper location on the dial. I think I will try the same on AM. There is a very strong signal at 700.

If there is no available schematic, is this about the best one can do? Is there any risk with doing this? For one thing, I am not certain which trimmer goes with which circuit. There is a small diagram on the back inside cover but it lacks details.

Is there any systematic approach people use in this situation?

Otherwise the radio is in pristine condition, and it sounds very good!


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 Post subject: Re: National Panasonic RF-100MA no schematic needs alignment
PostPosted: Nov Wed 22, 2017 6:56 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 2942
Location: Mountains of Mourne. Ireland.
R-100 alignment instructions: http://www.kevinchant.com/uploads/7/1/0 ... /r-100.pdf

Greg.


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 Post subject: Re: National Panasonic RF-100MA no schematic needs alignment
PostPosted: Nov Wed 22, 2017 8:25 pm 
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Joined: Mar Mon 27, 2017 4:29 pm
Posts: 52
Thanks! This is close,but the RF-100MA is a later model with 4-Bands (FM, AM, 2 SW) , 12-Transistors. Not sure how much translates?


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