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Old 21st May 2017, 3:57 pm   #41
yampy187
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Default Re: ITT CVC9 Frame fault

Ok I shall have a look.

Many Thanks

Jan
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Old 21st May 2017, 8:37 pm   #42
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Default Re: ITT CVC9 Frame fault

You say it's a disc. What colour is it, and the stripes if any. The Mullard data is a bit sparse to say the least.
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Old 21st May 2017, 8:56 pm   #43
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Default Re: ITT CVC9 Frame fault

The Mullard data in that book for that type (E299DD/P344) shows it has a code number of 2322-552-03441, that number is listed with the following band colours starting at the top of the VDR, 1) Orange, 2) Yellow, 3) Yellow.

Lawrence.
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Old 21st May 2017, 9:12 pm   #44
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Default Re: ITT CVC9 Frame fault

I wonder if a 110 or 120 volt zener would do to replace the VDR?

Lawrence.
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Old 21st May 2017, 9:18 pm   #45
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Default Re: ITT CVC9 Frame fault

As a test I would use a resistor, need to work out a value to give 4 or 5ma no more than 10ma through the OA91.

If it was me I would defeat the sound muting, check that the g1's on the CRT are biased approx correct and concentrate on the other problems first.
Frank
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Old 21st May 2017, 9:25 pm   #46
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Default Re: ITT CVC9 Frame fault

4 or 5mA? I don't follow?

Lawrence.
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Old 21st May 2017, 9:31 pm   #47
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Default Re: ITT CVC9 Frame fault

Enough to put the OA91 into conduction to defeat the sound mute without overloading the diode and burning it out.

Perhaps I am thinking about it incorrectly but that's my thoughts.
Frank
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Old 21st May 2017, 9:39 pm   #48
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Default Re: ITT CVC9 Frame fault

I think the max zener current would work out to be less than 2mA so far as I can make out.

Lawrence.
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Old 21st May 2017, 9:49 pm   #49
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Default Re: ITT CVC9 Frame fault

Quote:
Originally Posted by yampy187 View Post
Would anyone happen to know where i can source a new VDR?
Hi.

Do you have a photo of the VDR Jan? I have quite a few pulled VDRs from various sets so may be able to help. I can't at present check my CVC9 for the type of VDR as it's not immediately accessible.

Regards
Symon.
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Old 21st May 2017, 10:13 pm   #50
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Default Re: ITT CVC9 Frame fault

Quote:
Originally Posted by ms660 View Post
I think the max zener current would work out to be less than 2mA so far as I can make out.
Zener? I thought the OA91 would be forward biased, or are you meaning if you replaced the VDR with a zener?

I looked at the OA91 spec and 4 mA gave about 0.4v drop across it so 2mA may be enough if you used a zener to replace the VDR.

Hope I am following this ok, apologies if I am not.

Frank
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Old 21st May 2017, 11:41 pm   #51
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Default Re: ITT CVC9 Frame fault

I have a few pulls too, but not orange/yellow/yellow. From mine it would appear that it may look like a narrow orange with a broad yellow.
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Old 22nd May 2017, 7:55 am   #52
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Default Re: ITT CVC9 Frame fault

Quote:
Originally Posted by Nuvistor View Post
Zener? I thought the OA91 would be forward biased, or are you meaning if you replaced the VDR with a zener?
Yes, I was meaning replace the VDR with a zener.

Lawrence.
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Old 30th May 2017, 11:01 am   #53
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Default Re: ITT CVC9 Frame fault

Hi there Everyone! Thanks for all the very useful replies.

Ever so sorry for the long reply. its been a hectic last week or so.

Heres a picture of the VDR. Theres no colours on it at all. just a pale sandy colour body. (not the best quality image. ive not got a macro lense)

I have also replaced R422 1.8k and C306 330pf on the lopt panel which were bad. Still no change.

Kind regards,

Jan
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Old 8th Jun 2017, 11:28 pm   #54
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Default Re: ITT CVC9 Frame fault

Hi

I now have a picture! A bad connection on the frame output transformer was causing the problem. Alo a fuse had opened on the power supply panel. The tube looks good, very weak/wrong colours and lack of control of brightness to look into. also the issue of no sound.

Regards,

Jan
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Old 10th Jun 2017, 10:43 am   #55
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Default Re: ITT CVC9 Frame fault

Hi Everyone.

The CVC9 Is finally up and running perfect!

The lack of audio was traced to an O/C 3.3k resistor in the audio output stage. Replacement gave me fantastic clear sound.

The wrong/lack of colours turned out to be a faulty TDA1327A on the Decoder.

It looks like whovever owned the set previously had twiddled every pot in the convergence box and screwed everything up. a quick and dirty greyscale and convergence set up gives very pleasing relults. The tube is a cracker!!

The cabinet has also been re-finished with some suitable similar colour fablon as the cabinet was very rough round the edges.

Many thanks to all those who helped me get it going

Regards,

Jan
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Old 10th Jun 2017, 11:05 am   #56
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Default Re: ITT CVC9 Frame fault

That looks great and you have an impressive set up there, i spy PS1 and PS2 under the tv
very nice
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Old 10th Jun 2017, 12:49 pm   #57
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Default Re: ITT CVC9 Frame fault

Very nice pics there jan. also am I right in thinking that the skantic and the bush portable were the sets I took to mikes in may?.

Cheers
Neil.
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Old 10th Jun 2017, 2:29 pm   #58
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Default Re: ITT CVC9 Frame fault

Hi Neil. Yes they are indeed. Both Working quite well. Many thanks.

And thanks Records. I "chipped" the ps1 so I didn't have to spend ludicrous amount of money on games lol.

Regards. Jan
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Old 12th Jun 2017, 10:56 am   #59
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Default Re: ITT CVC9 Frame fault

That looks good! Quite an unusual and attractive woodgrain finish on the front of the TV, quite unlike the two I have here.
As usual a great picture on one if these - they just go on and on.
Glyn
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