1. Time for some upgrades in server hardware and software to enhance security and take AK to the next level. Please contribute what you can to sales@audiokarma.org at PayPal.com - Thanks from the AK Team
    Dismiss Notice

JVC TD-V711 Playback Head Azimuth Adjustment makes no difference

Discussion in 'Tape' started by Evan Wester, Dec 4, 2018.

  1. Evan Wester

    Evan Wester New Member

    Messages:
    7
    Hello!

    I have recently acquired a JVC TD-V711, in excellent shape.

    When I try to adjust the PLAYBACK azimuth, I can't hear any difference at all! This is especially troubling, considering all the two head decks I have pronounce playback azimuth errors quite audibly.

    Pictured is the head block diagram, and the screw I am adjusting during playback. The service manual says that this is the playback azimuth adjustment screw.

    This is my first 3 head deck, am I doing something wrong here, entirely?

    Thanks!
     

    Attached Files:

     

    Please register to disable this ad.

  2. hdrobien

    hdrobien Well-Known Member

    Messages:
    519
    Location:
    France
    Can you see the head block (shield plate) moving when you turn the screw ?

    From my understanding of the schematics, it is the correct screw for the play head.
     
  3. Evan Wester

    Evan Wester New Member

    Messages:
    7
    A startling discovery! The fastener/bolt (not a screw) for the azimuth turns, but doesn't actually move, or change at all!

    It's a loctited fastener that threads around a metal pole in the middle. I can make the fastener itself turn during playback, but nothing seems to be changing position.
     
  4. Evan Wester

    Evan Wester New Member

    Messages:
    7
    Nothing's moving at all. I can hear the spring making noises when I turn the screw, but that's it.
     

    Attached Files:

  5. hdrobien

    hdrobien Well-Known Member

    Messages:
    519
    Location:
    France
    The thread is possibly dammaged.

    Does the metal pole rotate while you turn the fastener ?
     
    Evan Wester likes this.
  6. Evan Wester

    Evan Wester New Member

    Messages:
    7
    Wait, I figured it out! I accidentally overloosened the fastener some time yesterday, but pressing against the back plate while tightening the screw seems to have restored its proper path. I can hear it making a difference again! Thanks hdrobien! [​IMG]
     

     

    Please register to disable this ad.

  7. dbxdx5

    dbxdx5 AK Subscriber Subscriber

    Messages:
    2,777
    Are you setting azimuth by ear or with a test tape and 'scope? I definitely recommend the latter if at all possible. Otherwise it's generally better not to touch it.
     
  8. Evan Wester

    Evan Wester New Member

    Messages:
    7
    Azimuth is being set by ear. I do not own a scope, and the tapes I'm playing are from a possibly huge variety of decks.
     

Share This Page