Question about Panasonic PV-7451 VHS VCR

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Panasonic VCR pv-7451: No sound in "normal" mode

Hi, when I playback a casset tape in "normal" mode the VCR does not playback any sounds, but when I switch to HiFi mode it has sound. This is troublesome because I have lots of tape that's in normal mode only (no HiFi), and all of them I don't have sound. Is the VCR broken? Did I miss a connection or a button somewhere? I tried all the menus. Help! Thanks!

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  • Daniel Sun Jun 28, 2006

    These are prerecorded tapes.

    I just tried recording a tv-channel with the vcr again:
    I set the audio to "mono", recorded for about 30sec.
    When I played it back, again, HiFi option gives sound and the Normal option has no sound.

    Thanks for your help.

  • Daniel Sun Jun 28, 2006

    How exactly do I "turn off" HiFi? That's what I've been trying to figure it out? I sure sound dumb here, but there's no such a button on the VCR, and the button on the remote doesn't do anything, lol.

    The tapes in question are ALL Normal. There's no HiFi Option for them when I press the "HiFi" button on the remote, and so no sound from the tapes.

  • Daniel Sun Jun 28, 2006

    Just to make things clear, when I put in a pre-recorded tape that is NOT HiFi (normal only) I do not get any sound from the VCR.

    Thanks

  • Daniel Sun Jun 28, 2006

    Thanks for that suggestion. I took the top off, and cleaned what you suggested according to this guide: http://www.hardwaresecrets.com/article/1...

    waited 5 min, popped in a tape, and still the same result: sound exists under HiFi, and No sound under "normal".

    I wonder if it's a circuit thing?

  • Daniel Sun Jun 28, 2006

    The "HiFi" button is found on the remote and no such switch on the VCR itself. If the tape has both HiFi and Normal, I can switch using the remote; but sometapes only have Normal, and pressing the remote doesn't do anything.

    When I play a tape that has both HiFi and Normal selections - if I select HiFi with the remote it produces sound, and if I select Normal it has no sound.

    When I play a tape that has only Normal as its selection, it has no sound.

    I have opened the top and cleaned as the person suggested.
    Is there something else I could do?

    Thank you

  • sloots Aug 11, 2008

    I have a panasonic vcr I do a lot of taping but recently the picture is there but no sound. Cornelia

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This is a wierd problem. First, You cannot do a manual selection for Mono / Stereo (HiFi) for recording in most Consumer Home VCRs. It is auto select, depending upon make, model, etc. Output of course can be selected - Mono, Stereo, HiFi, etc. Now, Most HiFi VCR machines have their Stereo / Hi Fi Audio heads on the Drum assembly, and the Normal /Mono audio Head on the Audio- Control Head. It is entirely possible that just the Audio - Control head has become 'dirty'. If you are good at these things, Unplug your VCR, Open the top cover, and, taking a cotton bud soaked in a few drops of iso-propyl alcohol (any Aftershave lotion will do) clean the Audio control Head. It is found as a small steel block on the mechanism, near the Capstan Pinch Roller ( a great big black roller). Wait for a couple of mins to allow the alcohol to evaporate, and then close the VCR. Power it up, and try playing the Pre-recorded Normal Tapes. Let me know if this has solved the problem.

Posted on Jun 28, 2006

  • Pravin Gupta Jun 28, 2006

    I have attached a image of how a Audio Control Head looks.

  • Pravin Gupta Jun 28, 2006

    AC Head Picture

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Are these prerecorded tapes or ones that you recently recorded? Or are they all normal audio tapes?? Try a pre recored and turn off the HI fi audio and thats an easy thing to do as put it in normal and mono.. Get back to us so we can assit. Not enough info as could be 100 things.

Posted on Jun 28, 2006

  • Larry  Dillon
    Larry Dillon Jun 28, 2006

    First off Please dont contridict me SIR!! As I do know what im talking about!!! There called ACE Heads not ac!! ie "audio-control-erase" heads. And if one became so dirty that they didnt pick up normal audio, they also couldnt track properly, as they also have the control or speed control head on the same head. AND sorry to say sir Ive seen an switch on several VCR's that do allow switching between differant audio tracks. look at the panasonics as well as the JVC's been doing this since they were only 3/4 inch versions . This persom probably has an electronic problem as a coupling cap or processor IC as a problem

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