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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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5th Sep 2018, 6:00 pm | #41 |
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Re: Thorn/Baird 8299 vhs vcr playback operation.
Off topic, nice Sanyo. Thought it was Akai, what model is it?
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5th Sep 2018, 6:01 pm | #42 |
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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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5th Sep 2018, 6:02 pm | #43 |
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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 Richard. |
5th Sep 2018, 6:04 pm | #44 |
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Re: Thorn/Baird 8299 vhs vcr playback operation.
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5th Sep 2018, 6:57 pm | #45 |
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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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5th Sep 2018, 7:00 pm | #46 |
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Re: Thorn/Baird 8299 vhs vcr playback operation.
Unfortunately I don't own a scope or know anyone who has got one.
Hmmm, darn. |
5th Sep 2018, 7:20 pm | #47 |
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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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5th Sep 2018, 7:48 pm | #48 |
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Re: Thorn/Baird 8299 vhs vcr playback operation.
Ok, will do, thanks.
Should I check the head pre amp too for any damage etc? |
5th Sep 2018, 8:43 pm | #49 |
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Re: Thorn/Baird 8299 vhs vcr playback operation.
Yes,certainly!
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6th Sep 2018, 5:22 pm | #50 |
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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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7th Sep 2018, 1:15 am | #51 |
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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. |
7th Sep 2018, 7:17 pm | #52 |
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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. |
7th Sep 2018, 10:09 pm | #53 |
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Re: Thorn/Baird 8299 vhs vcr playback operation.
I think those caps look ok.
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8th Sep 2018, 10:23 am | #54 |
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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. |
8th Sep 2018, 3:27 pm | #55 |
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Re: Thorn/Baird 8299 vhs vcr playback operation.
Hi,
Thanks Glyn. I've sent you a PM. Thanks again Richard. |