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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc.

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Old 5th Sep 2018, 6:00 pm   #41
toshiba tony
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Off topic, nice Sanyo. Thought it was Akai, what model is it?
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Old 5th Sep 2018, 6:01 pm   #42
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

If the drum is dirty than normally any recordings would not play on other machines either.
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Old 5th Sep 2018, 6:02 pm   #43
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Just cleaned the drum and tape path, there was absolutely no dirt/oxide on the drum at all. The picture is still the same.

I've attached a picture of a recording made on this vcr and played back in a different vcr, as you can see, it's very good.


Regards
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Old 5th Sep 2018, 6:04 pm   #44
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Quote:
Originally Posted by toshiba tony View Post
Off topic, nice Sanyo. Thought it was Akai, what model is it?
Hi Tony,

It's a Sanyo VTC6500 Betacord.

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Old 5th Sep 2018, 6:57 pm   #45
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Time to get the circuit and scope out.The only possibility is it a "man made" fault.We have all done it and they are the worst type.
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Old 5th Sep 2018, 7:00 pm   #46
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Unfortunately I don't own a scope or know anyone who has got one.
Hmmm, darn.
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Old 5th Sep 2018, 7:20 pm   #47
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Oh,I am a little too far away for you to use mine.Anyway it is worth a check for anything fallen off or more broke print.Check any connectors etc.
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Old 5th Sep 2018, 7:48 pm   #48
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Ok, will do, thanks.

Should I check the head pre amp too for any damage etc?
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Old 5th Sep 2018, 8:43 pm   #49
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Yes,certainly!
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Old 6th Sep 2018, 5:22 pm   #50
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

This is a very odd fault, in that I am amazed that the recorded picture is so good when played back on a good machine! I think it's time to have a look at the block diagram and refresh our memories. The servos are locking solid, and it looks for all the world like a head preamp problem - it certainly isn't far from the heads. Somewhere in the playback only path or the record/play switching. Check under the screened cover where the head rotary transformer connects in case there's a crack there. Then it's time to scrounge a 'scope!
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Old 7th Sep 2018, 1:15 am   #51
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Hi Glyn.

Thank you very much for that suggestion. I'll have a poke about in there a little later today to see if I can see any obvious faults.

Thanks again

Richard.
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Old 7th Sep 2018, 7:17 pm   #52
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

I've had a look at the pre amp PCB and the Y & Colour amp assy PCB and noticed that there are some yellow caps that look like they have bulged and gone bad.

They're on the Y & Colour amp PCB next to the playback col level pot and a further 2 in a metal enclosure on the same PCB.

Do the caps look bad to your eyes or am I just getting in a muddle?

Thanks again
Richard.
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Old 7th Sep 2018, 10:09 pm   #53
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

I think those caps look ok.
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Old 8th Sep 2018, 10:23 am   #54
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Hi
I agree - that sort of (non-electrolytic) capacitor rarely fails, and you can't tell from looking at them. To clarify, electrolytic capacitors are made in a different way and can (and do) show their guilt by their tops 'doming'. Non-polarised polyester (and similar) capacitors, generally with values from a few pF to around 1uF, are of a dry contruction and don't exhibit this behaviour. I realise this is very general, but there are websites that recommend recapping equipment to within an inch of its life! Whereas this is good advice on, sy, a 1950s TV full of old waxies, on something of this age it's not something that needs doing. Hvaing said that, your machine does have a few tantalum capacitors that may well be causing trouble. These are usually shiny red or blue blobs and can be replaced with a good quality electrolytic - or another tantalum, of course. You can see a couple of blue examples in your second picture.
I'd start looking at the print under the can with a glass - all that opening and closing the lower panel may well have caused a fracture.
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Old 8th Sep 2018, 3:27 pm   #55
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Default Re: Thorn/Baird 8299 vhs vcr playback operation.

Hi,
Thanks Glyn.

I've sent you a PM.

Thanks again
Richard.
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