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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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9th Sep 2017, 6:48 pm | #1 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
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National Panasonic TR-565G Component television
Friend bought this around for me to look at for him, it has reduced width leaving about 10mm either side. Other than that it works fine.
I have not been able to find a manual for it online, are there any stock faults for these before I strip it down which looks to be quite involved. Thanks
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Stephen _________"It`s only an old telly" ___ |
9th Sep 2017, 7:18 pm | #2 |
Heptode
Join Date: Jan 2007
Location: Luton, Bedfordshire, UK.
Posts: 891
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Re: National Panasonic TR-565G Component television
Leave it running for a while. If the width increases, most likely a slow electrolytic in the horizontal. You could simply replace all within the vicinity if unsure.
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Regards, John |
9th Sep 2017, 7:22 pm | #3 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
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Re: National Panasonic TR-565G Component television
It was on for 4 hours today with no change, the capacitors would normaly be my first call though.
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Stephen _________"It`s only an old telly" ___ |
11th Sep 2017, 2:29 pm | #4 |
Hexode
Join Date: Aug 2014
Location: Featherstone, West Yorkshire, UK.
Posts: 386
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Re: National Panasonic TR-565G Component television
Found this on the Radiomuseum website, any help to you?
Kevin |
11th Sep 2017, 2:36 pm | #5 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
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Re: National Panasonic TR-565G Component television
So far changed all electrolytic power supply capacitors along with the ones in the horizontal section C417 C418
No change so far but still investigating.
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Stephen _________"It`s only an old telly" ___ |
11th Sep 2017, 3:19 pm | #6 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,924
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Re: National Panasonic TR-565G Component television
Hi
Can't see in the pictures, but many small-screen sets used a high value capacitor to couple the line scan coils. That could be a suspect if there is one. Glyn PS Should engage brain first - looking at the excellent diagram I'd look at C412 and C410. |
11th Sep 2017, 3:30 pm | #7 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
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Re: National Panasonic TR-565G Component television
Thanks Glyn,
I have C412 out at the moment so we are one the same track at least. Now to test it.
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Stephen _________"It`s only an old telly" ___ |
11th Sep 2017, 4:38 pm | #8 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
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Re: National Panasonic TR-565G Component television
Those capacitors check out fine, so went back to the power supply again.
Found D75 which I believe to be a 5.1volt zenner diode with no voltage across it, testing shows an almost identical short both ways.
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Stephen _________"It`s only an old telly" ___ Last edited by Freya; 11th Sep 2017 at 4:57 pm. |
13th Sep 2017, 10:16 pm | #9 |
Octode
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,990
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Re: National Panasonic TR-565G Component television
The 5.1volt Zener diode D75 restored normal operation.
Think this can be closed now
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Stephen _________"It`s only an old telly" ___ |