Trying to fix VCR...

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  • Dannyx
    CertifiedAxhole
    • Aug 2016
    • 3912
    • Romania

    #1

    Trying to fix VCR...

    Good day folks. This may seem like something completely stupid and pointless to do nowadays, but I'm messing with a Samsung VCR mostly for fun and can't quite figure out what's wrong with it...I don't have it in front of me ATM to know the model exactly, but I shall post it soon, along with pictures hopefully.

    It's from the era when VHS was used for surveillance cameras: the thing has a jog dial, alarm inputs and triggers and stuff on the back and when I got hold of it it came with a tape inside which holds actual CCTV footage from a casino...go figure. It's like archeology. The time stamp says 2004...doesn't that kick ass ?

    Anyway, the problem: mechanically the device is fully functional: no snagging, no issues, tape loads, winds/rewinds, display picture...whatever, however it only likes to play back this one tape it came with (recorded by it): any other tape is unwatchable (noise on picture all the time). No amount of mashing on the tracking buttons changes anything (truth be told, I'm not even sure I know how to use the thing, because aside from the beeps it makes when I push the buttons, there's no other indication that's it's actually adjusting the tracking....). My rather brief knowledge of VCRs tells me that perhaps there's something wrong with the audio/tracking head. Since it's "broken" anyway and don't really care, I did something you're never supposed to do with a VCR and messed around with the alignment screws on the A/C head....no change. Still a lot of noise...not even a slight improvement or even a change in said noise. I even went stupid with it and removed the A/C head from the machine entirely...it didn't even care: the VCR kept on playing the tape very happily with no change whatsoever in the picture, even the counter kept on working...makes me wonder if that head is even working or not or if the problem is in a different area whatsoever :|

    Not having a lot of knowledge in fixing VCRs, I thought I'd get some help, or rather tips, from those more skilled than me, who perhaps have been around when VCRs were ruling the market and made a living out of fixing them and encountered this issue before. I'm talking about "advanced" fixing techniques, leaving out all obvious ones like try another tape, belts, etc...the VCR plays, just not well enough...dead A/C head ? Can it happen ? :|
    Wattevah...
  • eccerr0r
    Solder Sloth
    • Nov 2012
    • 8697
    • USA

    #2
    Re: Trying to fix VCR...

    You have very dirty heads!

    Comment

    • Dannyx
      CertifiedAxhole
      • Aug 2016
      • 3912
      • Romania

      #3
      Re: Trying to fix VCR...

      Yeah, that's another thing I need to mention: highly unlikely, since I cleaned the tape path several times now...which also doesn't explain why that one tape plays somewhat OK.

      Another details: in "still frame" and "CUE", the picture becomes somewhat better...

      Dirty head ? Yep, I do have that
      Wattevah...

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9535
        • Canada

        #4
        Re: Trying to fix VCR...

        Its a timelapse vcr, check if there is a switch that can change the playback speed, better yet find the manual. It also may not play sp,lp or ep tapes.
        Some models will playback sp tapes but not lp/ep
        Last edited by R_J; 07-02-2018, 02:38 PM.

        Comment

        • Dannyx
          CertifiedAxhole
          • Aug 2016
          • 3912
          • Romania

          #5
          Re: Trying to fix VCR...

          Yes, there is such a function, but I didn't want to cram too much info in my first post. There are two buttons labeled "speed + and -" on the front. The display cycles through several play times from L6 all the way up to 960 or something like that. I believe it selects the tape speed correctly (L3 for a "normal" tape) since in between all that noise I can just about see the picture playing at the right speed....some other incompatibility could still exist though and this may not be a fault at all, like for example the tracks recording differently on this thing than on a commercial VCR...
          Wattevah...

          Comment

          • R_J
            Badcaps Legend
            • Jun 2012
            • 9535
            • Canada

            #6
            Re: Trying to fix VCR...

            They basically record the same way but in timelapse they only advance the tape very slowly, actually the capstan is steped, it does'nt run slow, recording only a frame of video every second or two.
            Most of the time the video heads are worn out because the drum is spinning 24-7-365 days for years
            Last edited by R_J; 07-02-2018, 02:59 PM.

            Comment

            • Shock2cure
              Test Subject
              • Jul 2018
              • 140
              • USA

              #7
              Re: Trying to fix VCR...

              how many "Heads" are on the drum???, I'd check the resistance on every one for comparisons in relation to the others
              Like R J said, this thing constantly running in a never-closed casino.....24 hours...7 days....14-15 years worth....thats some serious mileage
              the super-fine wire coils on the heads eventually get smoothed down, flattened by the tape, like a super-fine emery paper
              Last edited by Shock2cure; 07-02-2018, 03:55 PM.
              "Our technologies have surpassed our humanity" ~Einstein

              Comment

              • kaboom
                "Oh, Grouchy!"
                • Jan 2011
                • 2507
                • USA

                #8
                Re: Trying to fix VCR...

                Well this is expected.

                Those time-lapse machines were run to the ground.

                Often rewinding & reusing the same tape- the main problem was they usually never got the maintenance required.

                If it won't play any tapes other than self-recorded, you've got the classic tape interchange issue. While it [i]could[/b] be worn heads, it's more likely that the wear on the tape path results in bad track registration (for a reference tape) for the current guide post adjustment.

                Put the machine into 2/4/6 hour mode and use a good prerecorded tape (those disney movies for example) and tweak the guideposts. Ideally, you'll have a scope on the head amp with triggering from the CTL pulse, but you can "wing it" with a CRT monitor and observe the lines in the pic.

                Clean the entire transport first, and pay particular attention to the "ridge" on the lower drum which the tape rides on.
                Goo here will cause mistracking, even with good heads and a shiny drum.

                A good reference:
                https://www.youtube.com/watch?v=wksbuYIifBw

                Don't forget to clean the mode switch. Check the power supply caps too, Samsung cheaped out in some models...

                Also:

                http://www.repairfaq.org/sam/vcrfaq.htm
                "pokemon go... to hell!"

                EOL it...
                Originally posted by shango066
                All style and no substance.
                Originally posted by smashstuff30
                guilty,guilty,guilty,guilty!
                guilty of being cheap-made!

                Comment

                • petehall347
                  Badcaps Legend
                  • Jan 2015
                  • 4426
                  • United Kingdom

                  #9
                  Re: Trying to fix VCR...

                  try recording then playback on a blank tape

                  Comment

                  • eccerr0r
                    Solder Sloth
                    • Nov 2012
                    • 8697
                    • USA

                    #10
                    Re: Trying to fix VCR...

                    I have a Samsung time lapse VCR as well, it worked a lot better after cleaning the heads. However indeed it was not designed for SP/LP tapes as the head was specifically designed for EP only. Though it cannot record SP/LP, it can play them, somewhat poorly.

                    But ultimately indeed they have many, many miles on them and the heads may not just be dirty, but simply worn out.

                    My Samsung time lapse vcr has only 2 heads, where my other VCRs have 4 or 6 heads...
                    None with a flying erase unfortunately.

                    Comment

                    • R_J
                      Badcaps Legend
                      • Jun 2012
                      • 9535
                      • Canada

                      #11
                      Re: Trying to fix VCR...

                      If you check the head resistance it will only tell you if it is open or not, it will NOT give you the condition, even a head checker is'nt reliable, Once the head (ferrite) is worn down it does not get proper head to tape contact to read the tape, there is just not enough signal to deliver good video.
                      Most of those vcr's have a hour log display
                      Last edited by R_J; 07-02-2018, 05:11 PM.

                      Comment

                      • Dannyx
                        CertifiedAxhole
                        • Aug 2016
                        • 3912
                        • Romania

                        #12
                        Re: Trying to fix VCR...

                        This one did like 4k+ hours, I checked the menus out of curiosity...mechanical wear is most likely the culprit...either that or I really need to scrub more, which is unlikely to solve the issue though...
                        Wattevah...

                        Comment

                        • eccerr0r
                          Solder Sloth
                          • Nov 2012
                          • 8697
                          • USA

                          #13
                          Re: Trying to fix VCR...

                          My first pass at scrubbing down the heads of my timelapse vcr didn't help much. After much more scrubbing I finally got the vcr to produce a reasonable picture. None of my other VCRs required this much cleaning to get it to give a reasonable picture, but most likely it had more hours upon it than any other.

                          Comment

                          • Shock2cure
                            Test Subject
                            • Jul 2018
                            • 140
                            • USA

                            #14
                            Re: Trying to fix VCR...

                            Originally posted by R_J
                            If you check the head resistance it will only tell you if it is open or not, it will NOT give you the condition, even a head checker is'nt reliable, Once the head (ferrite) is worn down it does not get proper head to tape contact to read the tape, there is just not enough signal to deliver good video.
                            Most of those vcr's have a hour log display
                            Like a rubber ball, went over ya head
                            check the resistance on every one for comparisons in relation to the others
                            "Our technologies have surpassed our humanity" ~Einstein

                            Comment

                            • Andrew F. Ali
                              Badcaps Legend
                              • Jan 2014
                              • 2450
                              • Trinidad & Tobago

                              #15
                              Re: Trying to fix VCR...

                              That appears to be a 'bad head' problem. And yes I will tell you to check the belts and rubbers, they wear easily and can become soggy. On the Drum you may have 2, 4 or 6 heads. They break easily if you are cleaning by hand and apply too much pressure. Because the Drum spins all the time and very fast the heads can pick up gum from the basically stationary tape.

                              Comment

                              • R_J
                                Badcaps Legend
                                • Jun 2012
                                • 9535
                                • Canada

                                #16
                                Re: Trying to fix VCR...

                                .

                                Comment

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