#16
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Well I was watching the the capstan and Pincher roller assembly and even tried to see if I could push my finger up against it to see if I could get it to go up against each other more and it seems its gripping properly, I even tried recording a test tape and it didn't seem to make much of a difference whether or not I had switched the speed switch on the fly while it recorded or not it just recorded and played back at the same speed (which was a really fast speed.) Also it seems that the tuner that's built into the VCR isn't working right as I'm not getting any sort of white noise out of it and I can't get it to tune in my converter box for a signal source, it works by letting the converter box signal pass through to the TV itself but it won't go through the VCR's tuner, all I get is a blank black screen (just like I did with the VCR when I tried playing tapes in it before I got that part fixed.)
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#17
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No audio and video is weird, these machines weren't advanced enough to black out the screen and mute the audio if there was no video signal, so you should at least get audio and a garbled picture.
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#18
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Also when I was taking the tape cover off (the part you insert the tape in) I accidentally dropped a screw down into the VCR and I was trying to get the screw out and in the process screwed up the clock display (I accidentally forgot to unplug the unit when I went to retrieve the screw.) So what would of the screw hit that would of messed up the clock display? Also I think that the same incident that screwed up the clock display may have been what brought the tuner back to life minus the audio portion of it. Last edited by Captainclock; 12-21-2015 at 11:33 PM. |
#19
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You probably shorted something out with that screw.
The speed is regulated by the capstan and a complex electromechanical feedback loop that takes in speed sensor, tape signals (control track, etc.), etc. and adjusts motor speeds etc. accordingly. Several different things could be bad, but it's looking like most remaining possibilities are electronic....Those circuits require quite a bit of VCR specific knowledge and test equipment to properly troubleshoot and adjust...Enough so that it may be better to just find another VCR....
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#20
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Audiokarma |
#21
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Regarding the speed and test-tape issues, the key is to compare using a known-good VCR. For example, if you play a tape recorded on the Hitachi on another machine, does it play properly? (And, switching the speed while a VCR is recording may not even work; you might have to hit Stop first. But, trying each speed available is a good plan.) Make sure your test VCR can play all the speeds of the Hitachi (so, don't use a VBT-200 or VCT-series machine to try to play an "SLP" or "EP" recording).
__________________
Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did." |
#22
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As for the test tape I couldn't even make a proper test tape because the tuner on the VCR isn't even working right so I had no way to get a test signal into the VCR for recording test purposes. |
#23
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OK. If the VCR has video/audio input and output jacks, you could try connecting a digital-TV converter box. For oscilloscopes, look for hamfests in your area maybe, when you can afford one.
__________________
Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did." |
#24
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__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#25
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__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
Audiokarma |
#26
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I have looked locally and most of the schools got rid of any equipment like that years ago, and I don't have any swapmeets near me that I could go to, I live smack dab in the middle of northern Indiana which has nothing in the way of ham-fests or swapmeets for radios and TVs, and the local flea markets and antique stores have yet to have anything like that for sale in them, the closest I've seen to test equipment like what you are talking about was a signal generator at a local flea market, and it was in my price range but I didn't have the money on me at the time to buy it and when I went back the next time when I did have the money for it, it was already gone. So basically where I live it isn't much of a hotbed for vintage test equipment.
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#27
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I don't think there are any hamfests or radio swap meets in my area, the closest ones that I know of from reading through people's posts on here in VK is in Chicago or near Detroit and I'm not too thrilled about driving to either location by myself because of traffic and because I'm just not familiar enough with those areas to drive in them on my own.
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#28
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Well, there is one in La Porte on February 27th. Maybe you will be lucky if you go there.
http://www.lpcarc.org/ http://www.arrl.org/hamfests/search
__________________
Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did." |
#29
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#30
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OK So here's something interesting that this VCR is doing now, I went to plug in the VCR and try it out again just to see what it was doing and sure enough the tape was playing and detecting the proper speed now all of the sudden, but here's the catch its gone back to not putting out any audio or video again, but this time instead of the no audio and video signal issue being just in the VCR part, its also in the tuner part now as well, all I get is a blank black screen, just like before, so here's where the interesting part comes in, it seems that when the VCR is putting out the audio and video signal like its supposed to is when the VCR doesn't play and detect the proper playback speed of the tape, but when the VCR isn't putting out any audio or video signals it detects and plays the tapes at the proper speed...
Any ideas as to what would be causing this rather mind boggling issue? UPDATE: I just figured out what this VCRs problem is I took the bottom cover off so I could get a look at the bottom circuit board to see if I could find what part was shorted to cause the clock display to malfunction and sure enough I found that C549 had a cold solder joint on the positive lead and a lifted trace and no solder attaching the negative lead to the board, and I did notice that it was a newer capacitor replacement as it doesn't match design wise or brand name wise to the rest of the electrolytic caps on the board. So how would I go about repairing this issue? Last edited by Captainclock; 12-28-2015 at 12:55 AM. |
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