Sonix76 Model JM-100 - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Brendan Stewart · 1st Aug 2022, 8:49 pm

HI Chris,
Thank you for your input. As you can guess your potential cures are over my head. Being a simple soul I was hoping for a simple solution..more fool me eh!

That's a great idea concerning a help request.
Thank for being a solution thinking kinda guy..

DMcMahon · 1st Aug 2022, 9:31 pm

Quote:

Originally Posted by Brendan Stewart

Another query if I may... at the top of the circuit board in the first image, there are 2 inverted 'T' shapes that have remnants of solder but nothing connected. Past interference of something important removed??

The T shapes look like the symbol for a dipole aerial.

Are the two T shapes connected together by the track that goes to each one.

If they are not connected together I wonder if they are for connecting a 300 Ohm 2 wire Tee dipole FM aerial.

David

Brendan Stewart · 2nd Aug 2022, 6:54 am

HI David,
Thanks for the reply.
Yes they are connected but only the left is used for a short FM aerial wire.
Looks like they have been individually soldered before at some point.
Would love to know the radio alarm's history. Would be quite revealing me thinks!!

Brendan Stewart · 10th Aug 2022, 8:25 pm

***UPDATE***
So, I was resigned to this alarm clock radio being quiet forever but....the tuner movement started playing up again so, opened her up to apply a splodge or two of contact cleaner to the tuner wheel. Did this and worked a treat and here is where things changed. I noticed on the back of the vol slider a very small hole so thought 'why not drop some cleaner in there even though I had already done it by the font access'. Put her back together and plugged her in. turned radio on and started moving the slider like a man possessed!! Suddenly very strange LOUD noises started to appear! It howled at me and gave some serious deep feedback but then worked normally!! How bout that!? Hope it stays sorted and yep...it was a dodgy vol slider. Will no doubt have to replace in the future but at least I did not have to replace components! Phew!! Is this a common vintage radio fault I wonder?

Brendan Stewart · 29th Aug 2022, 7:52 pm

**UPDATE PT 2***
Was in fact not the volume slider. A capacitor was slightly loose and when touched the volume returned to normal. Assumed needed re-soldering so..removed it to clean the board and turns out it only had oner pin!! So ordered a replacement, fitted replacement, now works beautifully!! The End.

PS Thanks for all your input folks.

1st Aug 2022, 8:49 pm	#21
Brendan Stewart Triode Join Date: Nov 2017 Location: Norwich, Norfolk, UK. Posts: 45	Re: Sonix76 Model JM-100 HI Chris, Thank you for your input. As you can guess your potential cures are over my head. Being a simple soul I was hoping for a simple solution..more fool me eh! That's a great idea concerning a help request. Thank for being a solution thinking kinda guy..

2nd Aug 2022, 6:54 am	#23
Brendan Stewart Triode Join Date: Nov 2017 Location: Norwich, Norfolk, UK. Posts: 45	Re: Sonix76 Model JM-100 HI David, Thanks for the reply. Yes they are connected but only the left is used for a short FM aerial wire. Looks like they have been individually soldered before at some point. Would love to know the radio alarm's history. Would be quite revealing me thinks!!

10th Aug 2022, 8:25 pm	#24
Brendan Stewart Triode Join Date: Nov 2017 Location: Norwich, Norfolk, UK. Posts: 45	Re: Sonix76 Model JM-100 *UPDATE* So, I was resigned to this alarm clock radio being quiet forever but....the tuner movement started playing up again so, opened her up to apply a splodge or two of contact cleaner to the tuner wheel. Did this and worked a treat and here is where things changed. I noticed on the back of the vol slider a very small hole so thought 'why not drop some cleaner in there even though I had already done it by the font access'. Put her back together and plugged her in. turned radio on and started moving the slider like a man possessed!! Suddenly very strange LOUD noises started to appear! It howled at me and gave some serious deep feedback but then worked normally!! How bout that!? Hope it stays sorted and yep...it was a dodgy vol slider. Will no doubt have to replace in the future but at least I did not have to replace components! Phew!! Is this a common vintage radio fault I wonder?

29th Aug 2022, 7:52 pm	#25
Brendan Stewart Triode Join Date: Nov 2017 Location: Norwich, Norfolk, UK. Posts: 45	Re: Sonix76 Model JM-100 UPDATE PT 2* Was in fact not the volume slider. A capacitor was slightly loose and when touched the volume returned to normal. Assumed needed re-soldering so..removed it to clean the board and turns out it only had oner pin!! So ordered a replacement, fitted replacement, now works beautifully!! The End. PS Thanks for all your input folks.