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Pulling knobs off of a reciever - - help!

Discussion in 'Electronic Repair' started by Phillip Bigelow, Oct 14, 2003.

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  1. I am a neophyte when it comes to electronics, but I have decided to
    replace a small burned-out incandescent bulb inside the display panel
    of my old Marantz 25-watt receiver (circa 1980). Easy job. Shouldn't
    take more than 5 minutes. Remove the front panel from the rest of the
    case by removing 4 nuts from the front panel. Then pull off the
    control knobs. The problem is that the control knobs won't budge! I
    checked carefully, and there are *no* set screws, so that isn't the
    problem. The knobs are just your run-of the mill metal knobs. The
    only way to remove the front panel is to first remove the knobs, so
    that is why I believe the knobs are "removable".

    I don't want to damage anything inside the enclosure that the knobs
    are attached to. And frankly, I can live with a half-dark display
    panel.

    Before I decide to leave well enough alone, I thought I'd ask if there
    are any tricks involved in safely removing tightly-attached knobs. Or
    should I just become more "assertive" in my pulling?

    TIA

    <pb>
    --
     
  2. If there are no set screws, they should just pull off but may be quite
    tight after 23 years. I assume one is on the tuning knob. Since that
    is a just a bushing, you probably can't hurt anything with resaonable
    force. Try that one first.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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  3. Jeff

    Jeff Guest

    I am a neophyte when it comes to electronics, but I have decided to
    Hi,

    Are the knobs totally plain? If they have caps then lever
    those off and you will find a nut under the cap.

    Regards
    Jeff
     
  4. Angulos

    Angulos Guest

    If not succesful with the previous post...once you have tken out the four
    screws holding the front panel, use a mallet or wooden hammer and try hitting
    the panel as close to the knobs as possible...they should pop-up with a few
    strokes.
    Alphie
     
  5. Can you also get a squirt of CRC onto the hubs of the knobs ? that can help
    sometimes, don't let it run into the pots etc.
     
  6. El Meda

    El Meda Guest

    I usually pop the knobs out using a dentist tweezers as a small
    crowbar. Actually, I use an old pair of dentist tweezers with the tips
    broken, for better leverage.
    Ing. Remberto Gomez-Meda <>
    http://ingemeda.tripod.com/
    INGE - Ingenieria Electronica.
    Puerto Vallarta, Jalisco, Mexico.
     
  7. Yes, there is some justification for the existence of dentists. :)

    They have the greatest precision tools and the strongest adhesives!

    My apologies to those in the field....

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: The email address in this message header may no longer work. To
    contact me, please use the Feedback Form at repairfaq.org. Thanks.
     
  8. Joe

    Joe Guest

    Some knobs used a special spring loaded locking device as part of the bushing.
    You must reach behind it with a small screw driver and push the lock outward
    (towards the front of the knob) and pull at the same time.
     
  9. Lionel

    Lionel Guest

    Word has it that on 13 Oct 2003 17:03:13 -0700, in this august forum,
    (Phillip Bigelow) said:
    Probably the latter. Try levering the knob away from the panel with a
    strip of wood (such as a ruler) or plastic (to avoid denting or
    scratching the panel). If it's really stiff, try levering it from two
    sides, rather than just one.
     
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