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Old 9th Sep 2017, 5:48 pm   #1
Freya
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Default 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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Old 9th Sep 2017, 6:18 pm   #2
John123
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Default 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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Old 9th Sep 2017, 6:22 pm   #3
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Default 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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Old 11th Sep 2017, 1:29 pm   #4
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Default Re: National Panasonic TR-565G Component television

Found this on the Radiomuseum website, any help to you?

Kevin
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Old 11th Sep 2017, 1:36 pm   #5
Freya
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Default 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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Old 11th Sep 2017, 2:19 pm   #6
Welsh Anorak
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Default 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.
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Old 11th Sep 2017, 2:30 pm   #7
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Default 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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Old 11th Sep 2017, 3:38 pm   #8
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Default 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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Old 13th Sep 2017, 9:16 pm   #9
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Default 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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