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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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6th Jul 2021, 11:34 pm | #1 |
Triode
Join Date: Oct 2016
Location: Hayes, London, UK.
Posts: 38
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JVC HR-S8700 dead PSU
Hi, I have a JVC HR-S8700 VHS machine which is completely dead albeit for a repetitive clicking noise in the PSU. I suspect a bad cap somewhere but can anyone tell me where I should be looking in the PSU such as the primary or secondary part ?
Many thanks |
6th Jul 2021, 11:50 pm | #2 |
Heptode
Join Date: May 2006
Location: Accrington, Lancashire, UK.
Posts: 977
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Re: JVC HR-S8700 dead PSU
It's likely to be on the secondary. Check for s\c diodes. I'll look for psu diagram.
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6th Jul 2021, 11:58 pm | #3 |
Triode
Join Date: Oct 2016
Location: Hayes, London, UK.
Posts: 38
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Re: JVC HR-S8700 dead PSU
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8th Jul 2021, 9:14 am | #4 |
Triode
Join Date: Jan 2011
Location: Guildford, Surrey, UK.
Posts: 39
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Re: JVC HR-S8700 dead PSU
From my notes
Change C1502 in PSU from 27m to 33m |
9th Jul 2021, 6:41 pm | #5 |
Triode
Join Date: Oct 2016
Location: Hayes, London, UK.
Posts: 38
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Re: JVC HR-S8700 dead PSU
Thank you Steve. The strange thing is that the machine eventually fires up after a few minutes like there is no fault. Could this be related to this faulty capacitor or could it be also be a diode?
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9th Jul 2021, 7:46 pm | #6 |
Hexode
Join Date: Feb 2018
Location: Durham, County Durham, UK.
Posts: 324
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Re: JVC HR-S8700 dead PSU
is there a 1uf 50v in the primary [or similar ] like most of the panasonics ??.they do that come to life after a short while
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9th Jul 2021, 8:41 pm | #7 |
Triode
Join Date: Oct 2016
Location: Hayes, London, UK.
Posts: 38
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Re: JVC HR-S8700 dead PSU
Hi Steve, there is no C1502 anywhere I can see. Do you mean C5102 as this is a much smaller capacitor in the secondary part.
@Gallowfields, only 1 electrolytic cap in the primary circuit and that is 400v 68uF |
10th Jul 2021, 9:01 am | #8 |
Triode
Join Date: Jan 2011
Location: Guildford, Surrey, UK.
Posts: 39
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Re: JVC HR-S8700 dead PSU
Sorry -- yes I did mean C5102
I hope the attached helps |
9th Sep 2021, 10:09 pm | #9 | |
Tetrode
Join Date: May 2019
Location: Northumberland, UK.
Posts: 52
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Re: JVC HR-S8700 dead PSU
Quote:
Did you ever get this fixed, the machine is a real pain as you cant access the underneath of the pcb, you literally have to take the whole mechanism and pcb out of the chassis. |
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10th Sep 2021, 11:18 am | #10 |
Triode
Join Date: Jan 2011
Location: Guildford, Surrey, UK.
Posts: 39
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Re: JVC HR-S8700 dead PSU
Hi Scott
I had an email back from willow 5 saying it sorted the issue This is or was a very common problem on this model If you need a manual give me a shout back Steve |
11th Sep 2021, 3:43 pm | #11 |
Heptode
Join Date: Mar 2015
Location: Lefkada, Greece
Posts: 969
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Re: JVC HR-S8700 dead PSU
I'm not familiar with this model, but many JVC machines have IC protectors on both the power supply and the main board. They look like transistors but they only have two leads and they act as fuses. Many times they blow for no apparent reason.
Fivos |
20th Oct 2021, 10:00 pm | #12 |
Tetrode
Join Date: May 2019
Location: Northumberland, UK.
Posts: 52
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Re: JVC HR-S8700 dead PSU
i just picked up another one of these machines for £2 a couple of weeks ago.
Fortunately this one was working perfectly amazing how undesireable these great machines seem to be. In my opinion this is the best VHS deck JVC ever made, the TBC and DNR on these make tapes look better than any other VHS player ive owned. |