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 Post subject: SHARP BP-485
PostPosted: Sep Sun 20, 2020 10:38 pm 
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Joined: Feb Sun 03, 2019 7:44 pm
Posts: 1
Hello all,

Can anyone provide manufacturer alignment instruction for this set. Dial pointer is not show exact on low dial frequencies.

Thanks in advance.


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 Post subject: Re: SHARP BP-485
PostPosted: Sep Mon 21, 2020 1:47 pm 
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Joined: Jul Wed 22, 2009 3:07 pm
Posts: 866
Welcome to ARF!

This is a "relatively simple" AM only transistor radio.
The '65 Beitman manual has the service data for the radio (pg. 146), you should find it and download from the web.

You start first by aligning the IF-amplifier, it is 455kHz.
After that align the oscillator. First set the receiver to the low end of the band. Set you signal generator to the frequency the receiver shows.
Tune the oscillator coil to the max output.
Then set the receiver to the high end of the band, and set your sig gen to the same frequency. Tune to the max with the oscillator trimmer capacitor.
Repeat these steps as the adjustments are not totally independent from each other.
Then tune up the antenna circuit for optimal tracking, the process is similar. In this case you use frequencies higher than the low end, and lower than the high end of the band by about 10% to 15%, this will give better overall tracking.
Set the receiver close (10% to 15% higher) to the low end of the band, set your sig gen to the same frequency. Tune the output to the max by moving the antenna coil on the ferrite bar.
Then set you receiver close to the high end of the band and tune to the max with the antenna trimmer capacitor.
Repeat these steps.

Regards, Peter


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 Post subject: Re: SHARP BP-485
PostPosted: Sep Mon 21, 2020 2:32 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 14324
Location: Mountains of Mourne. Ireland.
Four-pages of service information was published in Sam TSM-32
I don't have it!

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Greg.


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