Told you yesterday that the Pentax MX’s light meter was acting up.
Well I opened the bottom plate this morning and poked around under it a bit.
There on the far right, below the big round thingamajick sits a double copper switch. This switch responds to three things.
First the shutter lock around the shutter button switches the meter off. Then the shutter button itself turns it on. And third, the wind lever, in it’s extended position, switches the meter on too.
So there’s several states!
Shutter switch off – everything is off!
Shutter switch on and wind lever in it’s rest position – the meter does it’s thing as long as the shutter is half depressed!
Shutter switch on and wind lever in it’s extended position – the meter is always on!
So what was the problem with my MX? Simply the little copper switch was bent a bit so it made continuous contact, whatever the other settings were.
Just a bit of prodding with a small screwdriver solved it nicely.
On to the light seals now and a bit of cleaning and here we go for a test roll…. in a few days.
Thanks for passing by!