Question about Zenith Televison & Video

5 Answers

I have a Zenith VRL427OHF VCR. It will play Tapes great, but when I have incoming video ,it is "off", like it it needs tracking. This happens with component or coaxial input. I have tried all combinations of input and out. I recorded , and played it, and that doesn't work. Any Help would gratly be appreciated. Thanks in advance, Sincerely; Brian Weber

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  • 3 more comments 
  • bweber137 Sep 09, 2010

    Thanks for your reply. I can solder, but but my knowledge of VCR repair is limited. Is there an easy way to describe where I would find the input switching area. And what is the PCB? I apolgize for asking, but would like to fix the VCR. I appreciate your help.

    Thanks in advance

    Brian W.

  • bweber137 Sep 10, 2010

    Thanks for your reply. I can solder, but but my knowledge of VCR repair is limited. Is there an easy way to describe where I would find the input switching area. And what is the PCB? I apolgize for asking, but would like to fix the VCR. I appreciate your help.
    Sincerely;Brian W.

  • bweber137 Sep 10, 2010

    There is a horizontal line abpout half way up on the screen. It does this with it on AUx, and when I have it on Ant IN, as well. "Silverdragon sais it could be a bad solder joint in the input switching area, or PCB. Iam asking where is the input switching area, and the PCB on the circuit board?

    Sincerely; Brian W.

  • bweber137 Sep 11, 2010

    Yes when I record something, it plays back garbeled or messed up. But even when I have Incomining video through the VCR ,without recording, it is messed up. Could it still be the record or erase head?
    Brian

  • bweber137 Sep 12, 2010

    Thanks for the reply krbjmpr : Someone suggested bad solder in the video input switching area. How do I tell if it is abad solder? And I don't think I could troubleshoot apower supply. Sorry for the inexperience.

    Brian W.

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5 Answers

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  • Zenith Master
  • 17,130 Answers

Please understand that the VCR tapes having a control track on the lower portion of the tape.
The control head senses the track and sends the pulse to the servo section of the VCR for switching the video heads.
If the alignment of the control headd is off, if the alignment of the tape positioner ont he drum is off, if there is dirt in the drum or rollers or dirt inthe control head( control and Audio head), this is possible to have the video not responding to tracking.
So clean the control head( the head near the pinch roller) and make sure that the tape is not pulled off the track.
If this is alright then the fault is within the servo section.
The possible control siganls are not processed and switched here with the help of the drum and capstan input signals.
This IC can be defective but you must be able to test with an oscilloscope to trace signals to confirm.

Posted on Sep 13, 2010

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  • Master
  • 1,476 Answers

Bweber137,

You need to clean the heads on your unit. If the heads are dirty the unit will play tapes fine but will not record satisfactorily. I have a tip at http://www.fixya.com/TipsAndTricks/thanks.aspx?thid=5970839 which expains the process in detail.

Thanks for using FixYa and for the great rating!!

hardrocko

Posted on Sep 12, 2010

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  • Master
  • 905 Answers

Hello Brian,

Your record head is clogged, or the erase head is not working like it should. If the record head is clogged, it is beyond the scope of the cleaning products available on the shelf.

Call around to a local repair shop, ask them what a "Tape Path" cleaning would cost. That will also force them to visually inspect the erase head, and perhaps save you a service charge.

Posted on Sep 11, 2010

  • Sheldon Dedek Sep 12, 2010

    No, if you are feeding video through the VCR, then to the TV, you should see what is originally playing. The VCR should not be affecting the picture at this point.

    This is now pointing to an interference problem. In your other comments (I can't see other solutions), you mention that you are able to solder. Are you able to troubleshoot a power supply? I suspect that a filter section is not doing what it is supposed to, and is introducing noise into the video path.

  • Sheldon Dedek Sep 14, 2010

    Looking for bad / cracked / cold solder joints is hard to describe in words, but here is a some material to take a look at. http://www.dummies.com/how-to/content/so...

    If you do find a bad joint (of whatever type), consider taking it to a service shop for the repair. Your VCR will be full of components and boards that are going to be sensitive to static discharge and stray voltage. Most consumer soldering irons don't offer protection against this.

    It may be time to bite the bullet and take the VCR into a service shop and let them charge their diagnostic fee. Then you can make the decision to repair it, some shops apply the diagnostic towards repair as well.

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  • Zenith Master
  • 5,807 Answers

Could the Input color system be the same as your VCR?

Have you tried connecting your " Incoming Video "

direct to TV , just to see if it is OK?

What incoming video are you referring to?

Have you tried a camera or other source ?

( if you have one? )

Posted on Sep 10, 2010

  • 6 more comments 
  • Rommel Cana
    Rommel Cana Sep 10, 2010



    More details on the picture you are having,


    Is it having color?

    Is it not having color and rolling?


    or it is having none at all

  • Rommel Cana
    Rommel Cana Sep 10, 2010



    If there is none at all, insure that you are set to AUX

    like sample image:


  • Rommel Cana
    Rommel Cana Sep 11, 2010



    If your problem is a horizontal line, then your problem on the switching

    input could be later after you can view full screen on your TV.


    If you have open the unit look for the yoke





    then follow the four ( 4 ) wires going to the main board,


    near to it , you will see an IC mounted on a heatsink


    have that pins ( IC ) resoldered first , then post

  • Rommel Cana
    Rommel Cana Sep 11, 2010




    • have a continuity check on the two coils on each

    ( Vertical , the other pair is for Horizontal )


    How to test for Continuity


    You may need to have:



    a Multimeter



    How to use a multimeter



    And a lot of patience


    And may need soldering tools


    How to solder boards properly



    • When these is done , and yet still same problem , then you

    may need to go down further to the main board


    • Check on the connectors ( On most it is yellow and green wire,

    yours might be different ).


    • But that would be less likely although, you are having one

    line of the screen.


    • Further ( after tracing ) it will lead you to the vertical Section


    another sample image:

    sample Vert IC






    • You may need to replace it , if replacing capacitors,

    double checking resistors value are OK,

    and after resoldering it properly wont still work.




    • Vert. Osc is the heart of the Vertical Circuits and

    most can be
    found inside the Jungle IC,

    include some resistors in probing,
    too.

  • Rommel Cana
    Rommel Cana Sep 11, 2010





    additional info:


    • the other two wires from the yoke,

    goes to the horizontal output transistor

    that is connected to the


    Flyback

  • Rommel Cana
    Rommel Cana Sep 11, 2010




    But have you tried connecting your TV to other sources like switching to

    Ant or a DVD player perhaps just to see if your TV is OK.



    And if it is OK,

    then your Video Circuits from VCR is bad , could be a bad op amp IC

    not the erase head and record ,


    you should see it clear on your TV even without recording

  • Rommel Cana
    Rommel Cana Sep 13, 2010




    Before opening anything , ( to be safe )


    I need to know if you have a problem when that player is not playing,


    I mean there is a complete raster on your screen ,

    even on either one of your TV inputs.


    There are hazardous voltages inside , if you would open your unit,

    even if you have the tools and equipment.

  • Rommel Cana
    Rommel Cana Sep 13, 2010




    I understand if you cannot see my former post.

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  • Zenith Master
  • 12,061 Answers

I suspect you have a bad solder joint on your input switcher IC, or on the Plug's where they join onto the PCB, in that area, this sounds like a bad solder joint, somewhere in the Input switching section.

Also check, all plugs and connections are tight, especially the center pins.and earths.

Posted on Sep 09, 2010

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