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Thread: How to open old Gralab 450 for repair?

  1. #1

    Join Date
    Apr 2019
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    20

    How to open old Gralab 450 for repair?

    Does anyone know the secret how to open old Gralab 450 darkroom timer for repair?

    I have one with small slide switches (not membrane ones like in newer 450 and 451) and they are not working 100% of the time, requiring fiddling and switching them back and forth.

    It seems to be an easy project to get them replaced, but I have no idea how to remove handles from rotary switches, they must have been glued on.

    Hopefully I'm not the only one trying to fix things instead of throwing them out

  2. #2

    Join Date
    Sep 2010
    Posts
    622

    Re: How to open old Gralab 450 for repair?

    Buy a can of CRC QD electronic cleaner at a NAPA store and try spraying into them from the outside and working them on and off. This may well restore them, if not you will surely find it very useful for other purposes.

  3. #3

    Join Date
    May 2006
    Location
    Sillycon Valley, CA
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    285

    Re: How to open old Gralab 450 for repair?

    If it is glue on the rotary switches, it is strong stuff. I have a 450 which I tried to work on. I tried pull one of the rotary switch handles off and ended up breaking the post off.

    -Darren

  4. #4

    Join Date
    Apr 2019
    Posts
    20

    Re: How to open old Gralab 450 for repair?

    Yes, that's what I'm afraid may happen There must be a way to do it, we just need to find a repair tech who knows how to do it

    Maybe heating it up can help with getting the glue to loosen up?

  5. #5

    Join Date
    Apr 2019
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    20

    Re: How to open old Gralab 450 for repair?

    Quote Originally Posted by Neal Chaves View Post
    Buy a can of CRC QD electronic cleaner at a NAPA store and try spraying into them from the outside and working them on and off. This may well restore them, if not you will surely find it very useful for other purposes.
    No concern about this cleaner finding it's way inside the timer?

  6. #6
    Tin Can's Avatar
    Join Date
    Dec 2011
    Posts
    15,345

    Re: How to open old Gralab 450 for repair?

    Lots of old timers fail from darkroom fumes

    I bought some here and eBay that supposedly worked!

    Fake News

    a 'hacker' like me would saw the thing apart, try fixing it, and patch the box. If it still fails 'recycle'...

    My 20 year old plastic Gralab 300 I bought new works great, my far older 'used' metal Gralab 300 NOW also works

    I have 3 other used working timers

    about 10 now 'recycled'

    I tried metronomes like some famous printers used...

    Tik Tok
    2022

  7. #7

    Join Date
    May 2015
    Location
    SooooCal/LA USA
    Posts
    2,103

    Re: How to open old Gralab 450 for repair?

    Check with George at Quality Light Metric... He was the repair station for some of the Gralab "clock"timers, but I'm not sure if he still does or what timers...

    Did you ask Gralab if they do, or their list of repair stations???

    Steve K

  8. #8

    Join Date
    Sep 2010
    Posts
    622

    Re: How to open old Gralab 450 for repair?

    Quote Originally Posted by LF_Alex View Post
    No concern about this cleaner finding it's way inside the timer?
    I have been using the stuff for years with no problem. It's safe on whatever circuitry is inside and evaporates with no residue.

  9. #9

    Join Date
    Apr 2019
    Posts
    20

    Re: How to open old Gralab 450 for repair?

    Quote Originally Posted by LabRat View Post
    Check with George at Quality Light Metric... He was the repair station for some of the Gralab "clock"timers, but I'm not sure if he still does or what timers...

    Did you ask Gralab if they do, or their list of repair stations???

    Steve K
    It will cost about 2 or 3 times more to get them repaired by Gralab, compared to buying one from eBay

  10. #10
    Eric Woodbury
    Join Date
    Dec 2003
    Posts
    1,465

    Re: How to open old Gralab 450 for repair?

    I'll guess that the screws that hold the case together are under the rubber feet.
    my picture blog
    ejwoodbury.blogspot.com

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