Sony Betamax SL-C6UB help please - UK Vintage Radio Repair and Restoration Discussion Forum

pudwink · 9th Dec 2016, 6:35 pm

Hi all
I brought myself this Betamax a few years ago. When I tried it out I got no picture. After googling around I found out about the dodgy capacitors, and after changing them I had a picture. It would go in and out a bit, but I could watch the few tapes I had.
Then it has been stood a while. I plugged it in again the other day. It started to lose the picture again, so I took it apart and saw that I had not replaced C7 or C8 on the SS9 board. I have done this today, problem now is although I get a picture it is full of interference and it sounds like it is playing too fast.
Any ideas would be much welcome.

Freya · 9th Dec 2016, 8:11 pm

Are you sure you put the correct values in, they have to be fairly good quality if they are 0.33, 0.22 etc.
Assuming these are ok then you might try adjusting RV001 on the servo board. You need to adjust until you read 5.5 +/- 0.3 V on test point TP5.

pudwink · 9th Dec 2016, 8:47 pm

To be honest I am a novice to this I took the board into a place in the town and asked for two capacitors that were a direct replacement for what was there they were only 30p each any chance you have a diagram locating the test point and adjustment as I could not seem to find them.
many thanks

Freya · 9th Dec 2016, 9:11 pm

It should be marked on the board, I don't have the manual to hand, sorry.

dj_fivos_sak · 10th Dec 2016, 12:12 am

Here's the service manual:
http://freeservicemanuals.info/en/se...ERATIONMANUAL/

Make sure you have the correct capacitors in and try adjusting the servo board.

Fivos

9th Dec 2016, 6:35 pm	#1
pudwink Pentode Join Date: Jan 2011 Location: Nottingham, Notts. UK. Posts: 207	Sony Betamax SL-C6UB help please Hi all I brought myself this Betamax a few years ago. When I tried it out I got no picture. After googling around I found out about the dodgy capacitors, and after changing them I had a picture. It would go in and out a bit, but I could watch the few tapes I had. Then it has been stood a while. I plugged it in again the other day. It started to lose the picture again, so I took it apart and saw that I had not replaced C7 or C8 on the SS9 board. I have done this today, problem now is although I get a picture it is full of interference and it sounds like it is playing too fast. Any ideas would be much welcome.

9th Dec 2016, 8:11 pm	#2
Freya Octode Join Date: Jan 2009 Location: Falmouth, Cornwall, UK. Posts: 1,990	Re: Sony Betamax SL-C6UB help please Are you sure you put the correct values in, they have to be fairly good quality if they are 0.33, 0.22 etc. Assuming these are ok then you might try adjusting RV001 on the servo board. You need to adjust until you read 5.5 +/- 0.3 V on test point TP5. __________________ Stephen _________"It`s only an old telly" ___

9th Dec 2016, 8:47 pm	#3
pudwink Pentode Join Date: Jan 2011 Location: Nottingham, Notts. UK. Posts: 207	Re: Sony Betamax SL-C6UB help please To be honest I am a novice to this I took the board into a place in the town and asked for two capacitors that were a direct replacement for what was there they were only 30p each any chance you have a diagram locating the test point and adjustment as I could not seem to find them. many thanks

9th Dec 2016, 9:11 pm	#4
Freya Octode Join Date: Jan 2009 Location: Falmouth, Cornwall, UK. Posts: 1,990	Re: Sony Betamax SL-C6UB help please It should be marked on the board, I don't have the manual to hand, sorry. __________________ Stephen _________"It`s only an old telly" ___

10th Dec 2016, 12:12 am	#5
dj_fivos_sak Heptode Join Date: Mar 2015 Location: Lefkada, Greece Posts: 969	Re: Sony Betamax SL-C6UB help please Here's the service manual: http://freeservicemanuals.info/en/se...ERATIONMANUAL/ Make sure you have the correct capacitors in and try adjusting the servo board. Fivos