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 Post subject: Sony ICF-6500W
PostPosted: Sep Thu 09, 2021 4:48 pm 
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Joined: Jun Wed 07, 2017 2:20 pm
Posts: 40
Location: São Paulo/SP Brazil
Friends my radio Sony ICF-6500W is marking the tune of, for example, 107.9Mhz in the position of the Dial at 105.0Mhz.
The first 87.5Mhz this correct works fine.
How to fix this what is the frequency setpoint on this radio, does anyone know?
I appreciate any help.

Sony ICF-5600W.jpg
Sony ICF-5600W.jpg [ 544.66 KiB | Viewed 259 times ]

QSL do Brasil
 Post subject: Re: Sony ICF-6500W
PostPosted: Sep Fri 10, 2021 1:23 pm 

Joined: Jul Wed 22, 2009 3:07 pm
Posts: 935
This is an analogue tuned radio, so you can adjust the FM-oscillator settings. Most probably the FM local oscillator settings are off a bit.
Download the service manual, e,g, from elektrotanya:
The Fm oscillator is Q10 and its circuitry.
The built in frequency counter measures the frequency of the local oscillator, on the FM band too, and it can be used for adjusting the oscillator.
Tune the radio on FM to 88MHz on the dial scale. Adjust L9 that the counter would read 88MHz on the display.
Tune the radio on FM to 108MHz on the dial scale. Adjust C12 that the counter would read 108MHz on the display.
Repeat the above two steps, as adjusting one setting will change the other a bit.
Now tune up the antenna circuits of the FM bands.
Use a signal generator, or if you do not have one, use radio stations broadcasting on the FM band.
Select a station, or set the signal generator to around 90MHz - 91MHz. Tune the radio to receive at that frequency.
Adjust L10 to maximum output signal.
Now tune to around 105MHz - 106MHz or so, using a radio station, or the signal generator.
Adjust CT11 to maximum output.
Again, repeat the above two steps.
This should tune up the radio on the FM band.

Good luck, Peter

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