Calibrating Calcu-Light XP

[timparkin]

My Calcu-Light XP was reading one and two thirds stops under so I thought I have nothing to lose by opening it up. I tested each of the pots and found the one that set up the calibration. It's a simple tweak and I'm now back in sync with my Pentax Spotmeter.

You have to
Take the battery cover off and undo the screws.
Put the cover back on the battery cover with batteries still inside
Peel back the rear cover (glued on) try not to crease it, a smooth bend should be OK
Undo the two screws underneath the cover.

You should be able to access the blue pot with a brass screwhead that is at the bottom of the meter (there are four. Top left and top right and middle left. You want the bottom right one (see pictures).

Turn anticlockwise to increase your reading
Turn clockwise to decrease your reading

It takes about 2 or possibly three turns for a single number change (which is a third of a stop).

 

[MartinCrabtree]

Do you know if the same would apply for a Quantum Calcu-FlashII? They appear similar and mine reads one stop off the meter in my Nikons consistently.

 

[timparkin]

I should think it would work for a Calcu-flash II - if you open it up you should see the same pots I would imagine..

 

[MartinCrabtree]

Now I'll have to work up the guts to open it up...........

 

[timparkin]

Now I'll have to work up the guts to open it up...........

The metal panel on the back is pretty thick so doesn't crease much when you peel it back (use a long, flat, blunt instrument) and I've stuck mine back OK with a bit of carpet adhesive. The meter is pretty robust - I unsoldered the copper shield on the inside of the back cover for easy access but you don't have to

 

[bob1000]

My Calcu-Light XP was reading one and two thirds stops under so I thought I have nothing to lose by opening it up. I tested each of the pots and found the one that set up the calibration. It's a simple tweak and I'm now back in sync with my Pentax Spotmeter.

You have to
Take the battery cover off and undo the screws.
Put the cover back on the battery cover with batteries still inside
Peel back the rear cover (glued on) try not to crease it, a smooth bend should be OK
Undo the two screws underneath the cover.

You should be able to access the blue pot with a brass screwhead that is at the bottom of the meter (there are four. Top left and top right and middle left. You want the bottom right one (see pictures).

Turn anticlockwise to increase your reading
Turn clockwise to decrease your reading

It takes about 2 or possibly three turns for a single number change (which is a third of a stop).

View attachment 159133 View attachment 159134 View attachment 159135

I know that you posted this a long time ago.
The +ve lead and a small bit of PC track came off my Calcu -Light-XP and I cannot work out (the bit of copper track is deformed) what solder tabs need to be linked to the +ve lead. Do you or anyone else by any chance have a photo of the opposite side of the circuit board so that I can see what is connected to the +ve lead?
Any help or a circuit diagram would be great.
I collect light meters and have the Calcu-Flash but the Calcu Light XP is an interesting meter and I would like to restore it.

Thanks