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 Post subject: SONY ICF-SW7600
PostPosted: Jul Thu 21, 2022 6:49 pm 
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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
Attachment:
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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File comment: cockroach
IMG_20220721_173808.jpg
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Traces of electrolyte from under the capacitors looked terrible, but the pads are surprisingly in good condition.
Attachment:
File comment: electrolyte
IMG_20220721_173828.jpg
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Attachment:
File comment: pads
IMG_20220721_181253.jpg
IMG_20220721_181253.jpg [ 277.45 KiB | Viewed 17528 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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Location: Bryansford Village. 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
Image


Attachments:
my sony icf-7600d.jpg
my sony icf-7600d.jpg [ 646.57 KiB | Viewed 17511 times ]
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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 7:58 am 
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More photo
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File comment: LCD board
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File comment: LCD board back
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IMG_20220721_173229.jpg [ 260.91 KiB | Viewed 17444 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 8:10 am 
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Attachment:
File comment: main board
IMG_20220721_173930.jpg
IMG_20220721_173930.jpg [ 239.45 KiB | Viewed 17443 times ]

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File comment: main board back
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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.
Attachment:
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 17443 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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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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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.
Attachment:
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 17442 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 8:38 am 
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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.
Attachment:
File comment: FM
FM.jpg
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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.
Attachment:
File comment: trace 1
IMG_20220723_215113.jpg
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File comment: trace 2
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File comment: trace 3
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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 17441 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jul Sun 24, 2022 12:25 pm 
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video https://youtu.be/BPOSh1Z1fMM

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Aug Mon 15, 2022 11:08 am 
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Joined: Apr Wed 29, 2015 2:33 pm
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Location: Branson, Missouri
Boy, what an adventure! Great repair job on a classic portable. Thanks for all of the images and notes. Very informative!

Mike, N0TLD


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 Post subject: Re: SONY ICF-SW7600
PostPosted: Aug Mon 15, 2022 7:39 pm 
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Thank you Mike!
I hope this will be useful to someone and perhaps inspire also to bring some old radio back to life.

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Sat 19, 2022 9:37 pm 
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Today I started repairing another Sony ICF-SW7600.
Attachment:
File comment: Sony ICF-SW7600
IMG_20221119_151422.jpg
IMG_20221119_151422.jpg [ 228.76 KiB | Viewed 16506 times ]

The owner complained about poor performance and lack of FM. When I opened it, I saw complete horror.
Attachment:
File comment: bad job
IMG_20221119_153003.jpg
IMG_20221119_153003.jpg [ 288.98 KiB | Viewed 16506 times ]

After I threw out all the wrong parts and washed the board, I saw the consequences of the previous "repair".
Attachment:
File comment: soil
зображення_viber_2022-11-19_20-51-02-243.jpg
зображення_viber_2022-11-19_20-51-02-243.jpg [ 228.25 KiB | Viewed 16506 times ]

Attachment:
File comment: broken pads
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Attachment:
File comment: broken pads
зображення_viber_2022-11-19_20-44-48-962.jpg
зображення_viber_2022-11-19_20-44-48-962.jpg [ 655.03 KiB | Viewed 16506 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Sun 20, 2022 12:58 am 
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Location: Vancouver, BC, Canada
Following with bated breath. Excellent photos.

Cheers Geoffqf


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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Tue 22, 2022 5:18 pm 
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Location: Boiling Springs, PA
Very useful info. I have the exact same receiver and have done the exact same repairs with the same damage to the board. Mine works fine now except AM is offset now and I need to use the fine tuning instead so I must have missed a defect. I don't plan to disassemble it again.

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Tue 22, 2022 6:51 pm 
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flyboy71 wrote:
Mine works fine now except AM is offset now and I need to use the fine tuning instead so I must have missed a defect.


Have you did alignment according to the service manual?

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Tue 22, 2022 8:01 pm 
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No I didnt. Its not a big deal but maybe Ill open it up someday and run the alignment. When I did mine I didnt have all the info you provided which is very useful.

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Sat 26, 2022 2:17 pm 
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Since I only have electricity and internet for a few hours a day, mostly at night, doing repairs is much more difficult now. However, we continue.
First you need to restore the torn off C2 and C89 capacitors pads and PCB through hole rivet. It is B+ line
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File comment: B+
B+.jpg
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File comment: hole
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File comment: hole back
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File comment: new pad
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File comment: C2
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File comment: C89 pad
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File comment: C89 new pad
IMG_20221125_035241.jpg
IMG_20221125_035241.jpg [ 397.15 KiB | Viewed 16280 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Sat 26, 2022 2:26 pm 
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C127 in the DC/DC converter mod is done.
Attachment:
File comment: C127 mod
IMG_20221125_033614.jpg
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File comment: C127 imod 2
IMG_20221125_033625.jpg
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All capacitors have been replaced.
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File comment: all new caps
IMG_20221125_124445.jpg
IMG_20221125_124445.jpg [ 272 KiB | Viewed 16279 times ]


The first power up is successful.
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File comment: first power up
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2nd local adjustment
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File comment: 2nd local adjustment
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3 kHz step adjustment
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File comment: 3 kHz step adjustment
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5 kHz step adjustment
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File comment: 5 kHz step adjustment
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FM VCO voltage adjustment
Attachment:
File comment: FM VCO voltage adjustment
IMG_20221126_014210.jpg
IMG_20221126_014210.jpg [ 300.29 KiB | Viewed 16279 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Sat 26, 2022 2:32 pm 
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Also, someone over-twisted the Fine Tuning RV1 pot and it was jammed. I had to disassemble it, clean it and reassemble it correctly.
Attachment:
File comment: RV1
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The rest of the adjustment was also made and the plastic of the screen was polished.
Attachment:
File comment: fin
PXL_20221126_080425873.jpg
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Attachment:
File comment: final
PXL_20221126_080544115.jpg
PXL_20221126_080544115.jpg [ 310.49 KiB | Viewed 16279 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Nov Sun 27, 2022 3:29 am 
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video https://youtu.be/9gQ3AwwvBBU

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Jan Mon 30, 2023 10:01 pm 
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I got another one 7600 in excellent condition for restoration. It is really new and has probably never been turned on. Complete with box, but hardly receives anything. The electrolytic capacitors need to be replaced and the adjustment must be checked.
Attachment:
File comment: 7600
IMG_20230130_135806.jpg
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File comment: papers
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File comment: face
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Attachment:
File comment: back
IMG_20230130_140228.jpg
IMG_20230130_140228.jpg [ 614.01 KiB | Viewed 15674 times ]

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 Post subject: Re: SONY ICF-SW7600
PostPosted: Feb Wed 01, 2023 1:09 am 
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Location: Vancouver, BC, Canada
Spectacular!

And thanks for posting the pictures, they make great reference information!!!!

Geoff


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