20 Most Recent Sony ICF-SW7600 AM/FM/SW Radio Questions & Answers

check the connection inside the radio, switch of AC-DC connector maybe loose contact.( leak diode more probability replace it)

Sony radios of this era had notorious capacitor problems.... also several other brands were affected. These capacitors were underrated and the technology to make them was not at it's best back then. The cure is to replace the capacitors on the board with new electrolytics. About 28 of them need to be replaced but the big problem is to find someone to do this. the original capacitors are surface mount and must be removed and new radial lead caps put in their place, some are rather tough to get at and the new ones have to be placed carefully. My SONY ICF-SW7600 now works as new and maybe even better!
I have done this myself as I have skills working with surface mount capacitors. I offer my services to those who cannot find service for their radios. Please email me for details, I am not into making bucks on this, I just want to see these radios kept working and bringing enjoyment to their owners.
Good DXing Rod KB8DNS (copied and pasted)

A suitable 7cm 1watt 8ohm speaker is available from Amazon which is shallow enough to fit in. Just search 8ohm 7cm speaker. My 1980 vintage ICF7600 (analogue SW(x5) MW and FM)'s speaker suffered from the repeated loud click on switch-on caused by a design 'feature' which at every switch-on of the radio placed the entire charging current of the audio output isolating electrolytic 470mfd capacitor through the speaker momentarily until the capacitor had reached full charge at the half rail voltage of the audio output stage single ended pair. Eventually after 30-40 years of occasional use the speaker failed open-circuit! Bad circuit design Sony. A replacement original speaker was difficult to source, so I obtained through Amazon a suitable 1watt 8ohm speaker for the purpose. This and a 3watt similar item were bought for about £5 each. Instead of subjecting the new speaker to the same sharp current pulse of the 470mfd charging current at every switch-on, I modified the speaker drive circuitry by replacing the polarised 470mfd electrolytic with a 1000mfd non-polarised electrolytic capacitor and adding a half-rail voltage divider across the power rails formed of a pair of 1k resistors each bypassed by a 470mfd polarised electrolytic capacitor to act as a suitable audio output ground return for the -ve speaker terminal, the speaker's +ve terminal being fed as usual from the earphone feed-through output terminal when no earphone is plugged in. The audio output circuitry is as originally intended for an earphone plugged in, apart from the 470mfd electrolytic capacitor replaced by a 1000mfd non-polarised electrolytic.

Sony radios of this era had notorious capacitor problems.... also several other brands were affected. These capacitors were underrated and the technology to make them was not at it's best back then. The cure is to replace the capacitors on the board with new electrolytics. About 28 of them need to be replaced but the big problem is to find someone to do this. the original capacitors are surface mount and must be removed and new radial lead caps put in their place, some are rather tough to get at and the new ones have to be placed carefully. My SONY ICF-SW7600 now works as new and maybe even better!
I have done this myself as I have skills working with surface mount capacitors. I offer my services to those who cannot find service for their radios. Please email me for details, I am not into making bucks on this, I just want to see these radios kept working and bringing enjoyment to their owners.
Good DXing Rod KB8DNS

my Sony radio lcf-sw7600 didn't work. jast show the time.

If it does not have a setscrew it probably just pulls off. Look at the new one first that will indicate what you have to do.

Try Sony's esupport site. linked below LW MW SW FM Radio

http://www.radiolabs.com/downloads/manuals/sony/ICFSW7600.pdf

Hi, I have a suggestion that I hope helps here.
Let me give you some theory to think with.
Alkaline batteries do not act like conventional batteries do. When they are starting to fail the initially
give you high voltage but the power goes down rapidly. In other words, the voltage spikes and dies.
If you have mixed different batteries which are worn un-uniformly, or mixed battery types. i.e. Alkaline with non-alkaline then you could have strange characteristic in your radio. In your radio, I would test with a fresh set of batteries.
If you have the AC power adapter for your radio, I would try that as well, to see if the same thing occurs.
If it is not the battery issue, then it is the circuit board inside the radio. The parts on these circuit board were designed to be inserted with machines and are often too small to be put in by conventional repair technicians. Sony will have the components to repair if necessary.
Let me know how this goes for you.
Hope I've helped
Best Regards,
Mark

When a battery leaks it leak acid which can damage or ruin everything it touches. First how extensive was the leak? Was it just a bit or did it seep onto the circuit board? You can clean the terminals. Remember your dealing with battery acid. Do it over a metal can and brush the terminals with a small wire brush. (Don't touch your eyes until your finished and have thoroughly washed your hands.) Just like you would a battery terminal. Then when down to the metal again use a regular pencil eraser to finish the cleaning. You may try a drop of flux per terminal as well after using the wire brush. If a wire was negated then soldier a new one in. You can also use a small, dry, non soap impregnated SOS pad in place of a wire brush. Install new batteries and give it a try. If no acid ruined the circuit board it is just an issue of getting the terminals to run current through them again.