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#1
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That seems a bit too early for a date code, unless Panasonic was using up old parts when making their VCRs, because this VCR is from 1987...
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#2
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Yeah, on second thought, not likely.
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#3
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Quote:
https://www.mouser.com/datasheet/2/3...BA-1202965.pdf Perhaps the 40 indicates 400 volt? just a WAG, jr |
#4
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Quote:
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#5
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UPDATE: Replaced the bridge rectifier and the VCR is still blowing fuses, so I wonder if maybe the Q1 is bad in the power supply board (the transistor on the heatsink.) when I did the diode test it seemed like it checked fine, but maybe I wasn't doing the check correctly.
What would the correct replacement for that transistor be? I looked up that transistor (it was a Panasonic part number) and it didn't seem to cross-reference to anything currently being made (no NTE parts or anything.) |
Audiokarma |
#6
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If its anything like my unit, the heatsink transistor was bad after the fuse kept blowing. my mistake was not using a dim bulb tester the first time around, so I had to buy the replacement transistor TWICE. Luckily there was some NOS on ebay.
Yours has no C or B value on it? |
#7
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Quote:
I'll take a look in the morning. |
#8
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Hello. That looks like a rebadged Panasonic PV-4750. The 4760 is the hi-fi stereo version. Be sure to check the electrolytic caps in the power supply before using the machine.
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#9
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If this is the power supply your machine has, I can post the full schematic if you need it.
Fivos |
#10
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yep that's it right there, I still need to check the switching transistor in the power supply (Q1) because this power supply only has 2 transistors in it overall and the one of them is the Switching Transistor (the transistor attached to the heatsink) that's the only part I haven't changed yet that I suspect might be still causing the VCR to blow fuses.
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Audiokarma |
#11
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Quote:
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#12
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Yes, all the diodes checked fine yet. The only diodes that checked bad was the bridge rectifier, which I already changed that out for a modern replacement the switching transistor I have not had a chance to check yet, the way they did the power supply in this VCR is that you have to disconnect a ribbon cable that's connected in a strange manner and then undo 2 solder blobs holding it to the main circuit board and then bend a retaining tab and then gently remove it from the main board without cracking the main board.
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#13
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Quote:
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