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 Post subject: SONY ICF-SW7600
PostPosted: Jul Thu 21, 2022 6:49 pm 
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Joined: Aug Thu 26, 2021 7:07 am
Posts: 245
Location: Ukraine
One man asked me to repair his not working SONY ICF-SW7600 which he bought in 2008 for parts.
I never have deal with SONY before so I immediately agreed.
It is legendary and well known model http://stephan.win31.de/sony76-2.htm
I also learned a lot from this thread viewtopic.php?f=4&t=303062&hilit=7600
So today I got it in my curved hands )
A little bit dirty enclosure but not bad at all
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File comment: SONY ICF-SW7600
IMG_20220721_164310.jpg
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It even turned on, but did not respond to the buttons.
Inside I was greeted by a stuffed cockroach
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Traces of electrolyte from under the capacitors looked terrible, but the pads are surprisingly in good condition.
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File comment: electrolyte
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File comment: pads
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IMG_20220721_181253.jpg [ 277.45 KiB | Viewed 381 times ]

So I ordered and am waiting for new capacitors.

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Thu 21, 2022 10:01 pm 
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Joined: Jan Tue 31, 2012 12:55 am
Posts: 20958
Location: Mountains of Mourne. Ireland.
I have dozens of SONY radios from all decades and I have never seen anything like this one.

My icf-7600D from 1985 is absolutely perfect in every respect, and a bit of a sleeper radio as it will receive strong FM signals with the antenna down and folded in place!
… and I'm in the Boonies
https://www.collinsdictionary.com/dicti ... of-nowhere
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my sony icf-7600d.jpg
my sony icf-7600d.jpg [ 646.57 KiB | Viewed 364 times ]
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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 7:58 am 
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Location: Ukraine
More photo
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File comment: antenna wires
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File comment: dusty speaker
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File comment: LCD board
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File comment: inside
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File comment: LCD board back
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IMG_20220721_173229.jpg [ 260.91 KiB | Viewed 297 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 8:10 am 
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Joined: Aug Thu 26, 2021 7:07 am
Posts: 245
Location: Ukraine
Attachment:
File comment: main board
IMG_20220721_173930.jpg
IMG_20220721_173930.jpg [ 239.45 KiB | Viewed 296 times ]

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File comment: main board back
IMG_20220721_175006.jpg
IMG_20220721_175006.jpg [ 321.62 KiB | Viewed 296 times ]

It is not difficult to disassemble the receiver, so I changed more than two dozen capacitors. Quite a laborious job because you have to do the following operations:
1. twist the old cap.
2. cut off his legs.
3. rinse the place with alcohol.
4. dilute old solder with new solder.
5. use braid to remove all solder.
6. repeat step 3.
7. solder a new cap.
8. repeat step 3.
The mount is dense, so you have to act as carefully as possible so as not to damage neighboring parts.
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File comment: old caps
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File comment: result
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I added 100nF cap above new C127 in the DC/DC converter
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File comment: C127
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Attachment:
File comment: new C127
IMG_20220723_120655.jpg
IMG_20220723_120655.jpg [ 271.69 KiB | Viewed 296 times ]

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Last edited by US7IGN on Jul Sun 24, 2022 9:03 am, edited 1 time in total.

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 8:25 am 
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Location: Ukraine
The first power-up was successful, but I found that on AM the frequency did not match at 10kHz and the synthesizer needed to be tuned.
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File comment: 3kHz
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File comment: 5kHz
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On FM I could not receive a single station at all and decided that it also needed to be tuned.
Then I moved on to FM tuning and again, the values ​​were far from the desired ones. But it's easy to fix.
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File comment: FM VCO
FM VCO.jpg
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File comment: FM VCO
IMG_20220723_175333.jpg
IMG_20220723_175333.jpg [ 278.63 KiB | Viewed 295 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 8:38 am 
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Joined: Aug Thu 26, 2021 7:07 am
Posts: 245
Location: Ukraine
And then I found that I could not adjust the FM input circuits and I had to set the oscillator signal level too high to hear anything. Checking the voltage on the transistor Q13 showed its absence.
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File comment: FM
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I spent more than two hours to check all the elements and traces and find the reason for the lack of reception on the FM.
Under one of the capacitors glued to the board, corrosion apparently destroyed one of the tracks. I had a hard time finding the exact place where it happened. Next came radio microsurgery.
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File comment: trace 1
IMG_20220723_215113.jpg
IMG_20220723_215113.jpg [ 318.29 KiB | Viewed 294 times ]

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File comment: trace 2
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File comment: trace 3
IMG_20220723_220320.jpg
IMG_20220723_220320.jpg [ 304.1 KiB | Viewed 294 times ]

After that, I was able to adjust the FM and the radio perfectly receives both AM and FM.
After cleaning and assembling, I want to keep it for myself)
Attachment:
File comment: Final
IMG_20220723_184409.jpg
IMG_20220723_184409.jpg [ 327.31 KiB | Viewed 294 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 12:25 pm 
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Joined: Aug Thu 26, 2021 7:07 am
Posts: 245
Location: Ukraine
video https://youtu.be/BPOSh1Z1fMM

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