#61
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Never mind...! I am done.
BTW.. If you still have the HR-S8000 I would advise unplugging it when not in use or it might burn your house down! No thermal protection and fuses wouldn't blow either. ☺ Last edited by Ed in Tx; 05-25-2022 at 08:43 PM. |
#62
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I'm sorry I didn't mean to confuse you with the descriptions of the VCRs I had. I was just describing what I thought they looked like. |
#63
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I got my new (to me) analog ESR Meter today, installed some batteries and found some test leads for it (I had some spare test leads for it from an old $10 Harbor Freight DMM that died on me a couple of years ago) that worked with it perfectly and I tested those capacitors I mentioned that we figured out were part of the take-up and supply reel motor B+ lines and they all tested bad (they pegged out the ESR meter, at least I think so anyways if I'm reading it right, in reference to an ESR chart I downloaded from the internet.)
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#64
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Alright so I actually figured out that if the meter pegs out the capacitors are good. So I figured out that C6-C8 were the actual culprits, they actually suffered from the notorious Matshuista(sp?) green corosion/leakage issue and that's actually the first time I've ran into that so far.
But I know Shango and J. P. Dylan have both discussed it in their videos quite often so that's the only reason why I recognized it once I found them with my ESR Meter. Now to gets some replacement capacitors and install them and put the VCR back together and I think I should finally have a functioning VCR again. |
#65
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Well another update on the VCR, I did manage to find some capacitors for the VCR in my capacitor stash, and installed them, and put the VCR back together and it is partially fixed, the VCR is now powering on all by itself now when you plug it into the wall, and the take-up reel spindle is now spinning at a much faster speed than it used to when it is doing the self-diagnostic check.
But its still not spinning up the supply reel spindle and the video head drum isn't spinning up either in the self-diagnostic check, so I wonder if there's some more capacitors on another board that's involved with the loading/playback mechanism? Also I noticed that when the VCR attempts to power up the display screen shows "camera" on the readout which I'm not sure if that's normal or not but I'm wondering if that's maybe something that might be something to do with what's going on with the VCR and why its acting up? |
Audiokarma |
#66
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#67
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PV-8000 motor drive schematic 1.jpg PV-8000 motor drive schematic 2.jpg EDIT: Because the resolution of the attachments is garbage, here's the links for the full-res png files: https://drive.google.com/file/d/1Xge...ew?usp=sharing https://drive.google.com/file/d/1LGu...ew?usp=sharing Last edited by djfivos; 05-28-2022 at 09:33 AM. |
#68
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No, it wasn't it was set to the Line Input mode (which apparently triggers the "camera" light on the VFD Display readout, which is the same thing that happens when its actually set to "camera" mode.)
Anyways, I take it that the "Servo Board" also has some influence on the functionality of the VCR's loading/playback mechanism? If so could it be possible that there might be some bad caps on that board as well causing some issues? |
#69
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#70
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Also I was looking at the Servo/Control Board for this VCR in the Sam's and it seems that it does indeed control the take-up and supply reel motors as well besides the capstan and drum motors. So again I think I might take a look at that board for some bad capacitors with my ESR meter. Last edited by vortalexfan; 06-01-2022 at 07:40 AM. |
Audiokarma |
#71
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Well I took the Servo Circuit Board out and looked it over closely and when I was checking some of the electrolytics on the board, I noticed what looked like a dip or low spot in the board around one of the plastic stand-offs and so I looked at it closely and sure enough the board has several cracks in it that go through to the traces and so I think that the reason why this VCR isn't working is because of the cracks in the Servo Board.
Unfortunately I think this VCR is a lost cause unless someone has a donor board from a junker VCR that they'd be willing to send me or know of one somewhere for sale... |
#72
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#73
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And as a little update, unfortunately I found several broken traces on the main control board of the VCR (the board that contains the Servo Circuit, Index Circuit, and the System Control Circuits) that were from some cracks that I found on the circuit board that were around a couple of the plastic standoffs that were for supporting the board against the case when you installed the board into the case. I'm going to see if there's any way to repair those traces, if not I'll see if there's a board for this VCR available on feebay for sale. |
#74
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#75
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I'll post a picture of the broken traces when I get back from work later tonight. |
Audiokarma |
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