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08-14-2019, 12:39 PM   #1
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MX metering

Greetings - first time post and it's a question / problem (don't you hate people that do that...no help or advice, nothing useful no clever pictures of far away exotic locations nope asking for help straight off!)

I have a MX which I really like, I prefer the controls to the ME super which seem to be a bit flaky now there getting old. So I bought a second to run as a black and white or IR camera, I was just about to load up a film when I thought i'd compare the metering and they're completely different like the new ones 1/30 at f8 where as my original will be 1/1000th.
So obviouly spent an hour on google and armed with my new knowledge took the top plate off but wasn't greeted with the innards I was expecting - the drawings I downloaded showed 4 adjustible potentiometers (along with a very stern 'do not touch' warning on one). But this one isn't anything like that is it adjustable in any way shape or form or is the meter knackered?

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08-14-2019, 01:56 PM   #2
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Maybe the ISO dial is knackered.
08-15-2019, 11:55 AM   #3
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Use the pot you can see. This is a later version of the circuit board.
08-23-2019, 07:37 AM   #4
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So after a little cleaning this and wiping that here's the results - i've got it to match the light reading of my original MX outside by turning the single 'button' (im assuming a variable resistor or potentiometer) but as soon as its in shade the readings fall off rapidly.
Anyone know of a diagram for this later setup as im not even sure if what i've altered is the coarse light meter or the ISO?

08-24-2019, 06:08 AM   #5
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You have adjusted the right thing, on this later PCB it is the only meter adjustment possible.
The fact that it had to be altered suggests that something else in the circuit isn't performing as good as it once was, most likely the 2 light sensors at each side of the viewfinder, could be just dusty so worth having a look at them.
09-09-2019, 05:56 AM   #6
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QuoteOriginally posted by Analogue_Pine Quote
Greetings - first time post and it's a question / problem (don't you hate people that do that...no help or advice, nothing useful no clever pictures of far away exotic locations nope asking for help straight off!)

I have a MX which I really like, I prefer the controls to the ME super which seem to be a bit flaky now there getting old. So I bought a second to run as a black and white or IR camera, I was just about to load up a film when I thought i'd compare the metering and they're completely different like the new ones 1/30 at f8 where as my original will be 1/1000th.
So obviouly spent an hour on google and armed with my new knowledge took the top plate off but wasn't greeted with the innards I was expecting - the drawings I downloaded showed 4 adjustible potentiometers (along with a very stern 'do not touch' warning on one). But this one isn't anything like that is it adjustable in any way shape or form or is the meter knackered?
how do you take the top plate off? i want to see if i can install brighter meter led's
cheers
carl
09-09-2019, 06:19 AM   #7
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You can't install brighter LEDs, the original ones are all joined in a single assembly and standard LEDs would not fit.
09-09-2019, 06:39 AM   #8
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QuoteOriginally posted by Ray-uk Quote
You can't install brighter LEDs, the original ones are all joined in a single assembly and standard LEDs would not fit.
i was thinking of surface mount LEDs, still not possible?
I'm a printed circuit board designer so i could make a board that mimics the led module you describe but using brighter SM LEDs, well thats the idea


Last edited by emlclcy; 09-09-2019 at 06:45 AM.
09-09-2019, 07:47 PM   #9
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QuoteOriginally posted by emlclcy Quote
how do you take the top plate off? i want to see if i can install brighter meter led's
cheers
carl
Hi, im away from home / camera at the minute but the top plate is reasonably straight forward but obviously all the controls have to come off.
Before you start note what your shutter speed and ISO are

Then the only tricky bit is the film advance lever (without it infront of me to check) im pretty sure is a reverse thread

The shutter button lock is held by 2 tiny screws (and can be fiddly little buggers to get back in)

Hope you have more success in there than I did !
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