Anyone have a schematic of a Compur electronic shutter?

Robert Hall · May 28, 2010

My Compur is leaking current, probably through a bad capacitor or a worn switch. I would like to have a look at the shutter schematic if anyone might have one.

Barring that, does anyone know who might work on the electronic shutters?

Thank you

domaz · May 28, 2010

Is it leaking current and using too much battery? A simple fix might be the addition of an on-off toggle switch between the battery supply terminals and the rest of the shutter.

Robert Hall · May 28, 2010

Good thought. Right now I just keep the battery off until use. The current drain is so small, but if the thing sits for a month, then the expensive batter is shot. I think I will make a better connector and do what you mentioned using an external battery. Then the issue pretty much becomes mute.

That being said, if it's and easy fix for replacing components it would be nice to just fix the problem as I don't really like Band-aids to problems.

domaz · May 28, 2010

It's probably not an easy soldering job. I took a peak at one and it's basically surface mount stuff. A good tip is to skip the expensive PX-whatever batteries and use modern cheap 3.6v lithium batteries. They run the shutter fine and are lighter, and have more capacity than the orginial.

Robert Hall · May 28, 2010

You're making it too easy.

If that battery will run it, that would be great. I was thinking more along the lines of 3 AA's but this is much more efficient. Of course the AA's are cheap.

Thanks regardless.

ath · May 28, 2010

Have you seen (there was a url link here which no longer exists)

paul ewins · May 28, 2010

I've got a repro of the compur repair manual but there isn't a schematic. The circuit boards were meant to be replaced as complete assemblies, not repaired.

ic-racer · May 28, 2010

My 2 cents (worth every penny!):

1) I have drawn schematics from circuit boards much more complicated than those
2) Just because they considered a malfunctioning board trash doesn't mean it can't be fixed
3) The timer circuit on the old Omega timer is similar with a single piece of silicone (a SCR). In the one I repaired, all the resistors and capacitors were fine. The SCR was faulty. So, my first suspect on one of those board would be the transistors.
4) A diode-checking multimeter can check transistors fine.

Robert Hall · Jun 2, 2010

Thanks for the suggestions and the thread. My shutter works quite well, it just drains the battery slowly. I think I will give it a look inside at some point. I took it out over last weekend and it worked just fine.

Thanks again. I will let you all know if I dig into it, I will get some pics and let you know if I find a fix.

Cheers

domaz · Jun 4, 2010

ic-racer said:
My 2 cents (worth every penny!):

1) I have drawn schematics from circuit boards much more complicated than those
2) Just because they considered a malfunctioning board trash doesn't mean it can't be fixed

I agree completely that it can be fixed. But if it's surface mount components you need an expensive soldering station and lots of practice. Not something you can do with a Radio Shack soldering iron and some pipe solder you had lying around..

ic-racer · Jun 4, 2010

domaz said:
I agree completely that it can be fixed. But if it's surface mount components you need an expensive soldering station and lots of practice. Not something you can do with a Radio Shack soldering iron and some pipe solder you had lying around..

There was a picture posted somewhere that showed it was not surface mounted components right? Maybe in a link to another thread or somewhere.

unclemack · Jun 4, 2010

It's worth opening the shutter if it's the kind of work you're able to do.
Leaky cap. or device is certainly a possibility and they're often unmarked - which can be a pain.
Often though current drain is via corrosion products, look for green goo/whitish streaks anywhere in the circuit but especially around the battery box.
Without an accurate lab. power supply & a dummy battery you can use a thin metal disc/insulator/metal disc, a wire soldered to each disc, between battery terminal & contact to measure drain with a multimeter on progressively lower milliamp ranges. Checking the drain at all states and speeds of the shutter may help diagnosis.
Good luck with it!

Anyone have a schematic of a Compur electronic shutter?

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