Beovision 7102 CRT TV,schematic/advice please - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

Clydeuk · 7th Jun 2016, 12:04 am

You shouldn't have any convergence issues with a 30AX. I'm sure I used to swap yokes around on these back in the day without encountering any problems.

I always found converging a delta gun CRT quite therapeutic and a real challenge to get it as best it could be. You really need to know when to stop though.

hans · 7th Jun 2016, 12:26 am

Didn't these tubes have a potmeter on a small print on the scan coils? I remember having trouble With dry joints on this print.

zens.tv · 7th Jun 2016, 10:34 am

hi Hans,yes checked for dry joints already

Clydeuk · 7th Jun 2016, 11:58 am

When you say the scan coils are smoking, are you getting a picture still?

zens.tv · 8th Jun 2016, 10:33 am

no,managed to see picture just before it failed,and seemed to collapse into a vertical line down the center of screen,whilst coils smoking ,then no picture at all

Clydeuk · 8th Jun 2016, 3:04 pm

Remove the scan coils and have a close look at the winding. See if you can see any evidence of burning. I can't remember if you can see the winding when the yoke is removed, can you believe that when I must have worked on hundreds of sets with this CRT.

It seems strange that the coils would just fail after fixing the original fault.

zens.tv · 8th Jun 2016, 3:40 pm

will do cheers

used to work on many CRT sets myself.

only seen a few in the past 8 years and struggling to remember my theory

7th Jun 2016, 12:04 am	#21
Clydeuk Hexode Join Date: Mar 2012 Location: Liverpool, Merseyside, UK. Posts: 453	Re: Beovision 7102 CRT TV,schematic/advice please You shouldn't have any convergence issues with a 30AX. I'm sure I used to swap yokes around on these back in the day without encountering any problems. I always found converging a delta gun CRT quite therapeutic and a real challenge to get it as best it could be. You really need to know when to stop though.

7th Jun 2016, 12:26 am	#22
hans Heptode Join Date: Jan 2008 Location: Oslo, Norway. Posts: 632	Re: Beovision 7102 CRT TV,schematic/advice please Didn't these tubes have a potmeter on a small print on the scan coils? I remember having trouble With dry joints on this print.

7th Jun 2016, 10:34 am	#23
zens.tv Retired Dormant Member Join Date: Oct 2014 Location: London, UK. Posts: 324	Re: Beovision 7102 CRT TV,schematic/advice please hi Hans,yes checked for dry joints already

7th Jun 2016, 11:58 am	#24
Clydeuk Hexode Join Date: Mar 2012 Location: Liverpool, Merseyside, UK. Posts: 453	Re: Beovision 7102 CRT TV,schematic/advice please When you say the scan coils are smoking, are you getting a picture still?

8th Jun 2016, 10:33 am	#25
zens.tv Retired Dormant Member Join Date: Oct 2014 Location: London, UK. Posts: 324	Re: Beovision 7102 CRT TV,schematic/advice please no,managed to see picture just before it failed,and seemed to collapse into a vertical line down the center of screen,whilst coils smoking ,then no picture at all

8th Jun 2016, 3:04 pm	#26
Clydeuk Hexode Join Date: Mar 2012 Location: Liverpool, Merseyside, UK. Posts: 453	Re: Beovision 7102 CRT TV,schematic/advice please Remove the scan coils and have a close look at the winding. See if you can see any evidence of burning. I can't remember if you can see the winding when the yoke is removed, can you believe that when I must have worked on hundreds of sets with this CRT. It seems strange that the coils would just fail after fixing the original fault.

8th Jun 2016, 3:40 pm	#27
zens.tv Retired Dormant Member Join Date: Oct 2014 Location: London, UK. Posts: 324	Re: Beovision 7102 CRT TV,schematic/advice please will do cheers used to work on many CRT sets myself. only seen a few in the past 8 years and struggling to remember my theory