Sony ST-S310 tuner trouble

[hiwiho]

Hey folks,

i wanted to reuse my old ST-S310 (about 15yrs old) these days. But after a minute or two, the signal indicator falls back to zero and the tuner mutes. Once that happened, i cannot receive any of the stored programmes in stereo nor tune into a new one. When i tune through and come near a station, the indicator rises but when at the exact freq, it falls back to zero and mutes.If i switch to mono, it plays even without any indicated signal. I have to switch it off for an hour to get stereo and then i can repeat it all.

Any idea anyone? Any service manual floating around?

Matthias
(Berlin, Germany)

 

[Elso Kwak]

Carefully adjust the discriminator coil. You may also need to resolder that coil.

 

[hiwiho]

Elso,

done ;-) and success. You're always such a great help!

Matthias

 

[Elso Kwak]

Walang anuman!

Walang anuman!
(you are welcome)

 

[NOSTROMO34]

Sony ST-S310

Hi
I have a Sony ST-S310 Tuner which seems to have a memory problem. If I switch it off over night it looses all memorised radio stations. However if I only switch it off for a few hours it keeps its memory OK... Any ideas on this problem anyone as it is irritating to have to manual tune everyday or leave it on all the time.

Help !

 

[hiwiho]

pretty much seems like the cap that's buffering the memorys ps has gone weak. But don't ask me which one that is ;-)

Matthias

 

[civismo]

Hey folks,

i wanted to reuse my old ST-S310 (about 15yrs old) these days. But after a minute or two, the signal indicator falls back to zero and the tuner mutes. Once that happened, i cannot receive any of the stored programmes in stereo nor tune into a new one. When i tune through and come near a station, the indicator rises but when at the exact freq, it falls back to zero and mutes.If i switch to mono, it plays even without any indicated signal. I have to switch it off for an hour to get stereo and then i can repeat it all.

Any idea anyone? Any service manual floating around?



Matthias
(Berlin, Germany)

Hello !

I have the exact same problem with my Sony ST-S310


About the " Carefully adjust the discriminator coil. You may also need to resolder that coil. " , how can i do that ??

Here it is a video of a ST-S310 Disassembled

https://www.youtube.com/watch?v=ttcXSOOKW4o

Here it is the service manual: Téléchargement Gratuit Documents Techniques Audiosony/sts310.pdf

 

[sgrossklass]

Sony tuners from this era often have PCB-mounted transformers whose solder joints go bad. Renew these, and you should be back in business.

 

[civismo]

Sony tuners from this era often have PCB-mounted transformers whose solder joints go bad. Renew these, and you should be back in business.

Hello!

Could you please identify in this picture what transformers should i resolder ?

Thank you

An externally hosted image should be here but it was not working when we last tested it.

Captured from:
https://www.youtube.com/watch?v=ttcXSOOKW4o

 

[hiwiho]

Sorry - after 9 years i cannot remember which one it was

Just resolder all bigger parts (coils, capacitors), that'll do for sure!

Matthias

 

[Mooly]

You resolder anything that looks suspect. Its only 15 minutes work to go over every joint on the board if needs be. The coils and wound components are worth a close look. That includes the ones in the can... there may be a metal plate to remove under the PCB to gain access. None of the adjustable coils should be altered but it is common to find problems with the miniature presets. Mark them and then give them a turn to and fro several times finally resetting to the exact position they were in.

 

[civismo]

Oh, i didn´t noticed this was from 2006 !! Well, it will be funny to see our grand grand children someday searching this early century stuff that we´re putting online today

Could you at least remember if you needed to replace any electrolytic capacitor, or adjust some rotary Pots / Coils / Caps , or you fixed yours only by resoldering =?

Thanks again