Gralab 300 timer

[Csholl]

Hi,

This is a shot in the dark, but does anyone know how to open up a Gralab enlarger timer model 300? Mine is not working. At first, the second hand was not stopping at the twelve (not sure if this is a mechanical failure only). Secondly, it stopped working altogether. I saw a YouTube of someone working on it, but I don't know how to open it up.

[xkaes]

On all of mine there's a large, zinc, flat-head screw on each side -- in the middle, toward the back. I've never taken mine apart, but I assume that these four screws hold the back in place.

[Conrad . Marvin]

I have two and one has screws and one doesn’t. Presumably if yours has screws, it comes apart easily. If it has rivets you will have to drill them out and replace with sheet metal screws of the appropriate size. But first make sure that the hands aren’t touching each other. The one that I bought at a yard sale for $.50 w had a version of that problem and I think it was also necessary to adjust the hands to correct an error in position, but it was 30 years ago and my memory seems to stop just before that . . .
Good luck, they aren’t very complicated.

[Tin Can]

I have piles of failed timers

Buy a new one

I bought a new one 25 years ago

Works great

[xkaes]

I have piles of failed timers

I guess that makes it official --You're an OL' TIMER!!!

[xkaes]

...first make sure that the hands aren’t touching each other. The one that I bought at a yard sale for $.50 w had a version of that problem and I think it was also necessary to adjust the hands to correct an error in position,

This is a common problem!!!!!!! Just bend them back into shape.

[Kevin Crisp]

The plastic hands they went to on the later ones can easily strip at the base.

[xkaes]

Plastic hands? Really? I bet they even charged more for them!!!

[tundra]

I guess that makes it official --You're an OL' TIMER!!!

Can I second that?

[Jim C.]

Identify which style Gralab 300 you have, the earlier ones were steel cased with steel hands tipped
with glow in the dark paint, the later ones were plastic case and plastic glow in the dark arms.
All have screws, I've never come across one that was riveted.

Check the arm attachments first, the older steel case ones were more robust, the plastic case less so
especially the arms. Look at the hub that the minute setting hand is attached to, you should see a set screws
holding the arms to the clock motor shaft, they may have loosened, or worse case with the plastic case one
they may have cracked.