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MichaelHarris
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« on: March 20, 2006, 10:36:17 PM » |
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Are these types of meters like selinium? Do they go bad like selinium or is a non-working meter more likely a loose wire? I have a 500G I got working great except the meter and would like to try my hand at fixing it also.
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Dean Williams
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« Reply #1 on: March 20, 2006, 11:48:29 PM » |
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You can check the cell itself with an ohm meter. Attach each lead of the cell to your ohm meter leads and change the ambient light that falls on the cell, like from normal room light to holding the cell near a light bulb. The response should be fairly fast. A dead cell will show total resistance, or possibly no resistance at all. The more light that falls on the cell the less resistance your meter will read.
If the cell is dead you may be able to find one that fits the hole it came from at Radio Shack, etc. You'll probably have to adjust the galvinometer to match it.
If the galvinometer is bad, (needle doesn't respond with a small voltage) you'll have to source a dead camera for it. I'm guessing it should move at even a small fraction of one volt, but not positive about that.
Check connections before you go through this stuff though. It could well be corroded solder joints, broken wires, things like that.
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Dean W Filled with a vacuum Oh, and it's been SIX almost SEVEN years!  Larry; Try to keep up! |
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MichaelHarris
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« Reply #2 on: March 21, 2006, 12:23:34 AM » |
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Thanks Dean, I'm debating going back in to try and fix it. It has full manual so it may not be worth it. The camera is really small, not Paxette small but pretty small.
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John S
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« Reply #3 on: March 21, 2006, 07:21:04 AM » |
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Make absolutely sure that the battery is OK and contacts are clean. Sorry if you have already done this but your post does not make it clear whether you are aware that the meter is battery powered.
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MichaelHarris
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« Reply #4 on: March 21, 2006, 06:20:05 PM » |
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Thanks John, I tested the battery but I didn't clean the contacts yet. I'll do that tonight. Can a Cds cell die like a selinium one? I'm going to reopen it tonight and check all the contacts and continuity.
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Dean Williams
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« Reply #5 on: March 21, 2006, 06:25:53 PM » |
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Well, a CdS cell can go bad, like most electronic items. It just quits working one day, like any other resistor might do.
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Dean W Filled with a vacuum Oh, and it's been SIX almost SEVEN years! Larry; Try to keep up! |
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ImageMaker
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« Reply #6 on: March 21, 2006, 08:36:42 PM » |
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I had one of the CdS cells in my Spotmatic fail shorted a few months ago. Just got it back from repair for that...
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Never let yourself spend 25 years away from the darkroom...
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Dean Williams
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« Reply #7 on: March 21, 2006, 10:27:32 PM » |
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Michael, Radio Shack sells an assortment pack of cells for just a few bucks. There are 5 different cells in the package. You ought to pick one up just to see what you should expect from one on your VOM.
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Dean W Filled with a vacuum Oh, and it's been SIX almost SEVEN years! Larry; Try to keep up! |
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MichaelHarris
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« Reply #8 on: March 21, 2006, 10:40:49 PM » |
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I'll do that, I would kind of like to get it back to full working order. I have the light seals on order then it should be finished.
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MichaelHarris
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« Reply #9 on: March 22, 2006, 11:10:40 PM » |
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Did the cell test and it's dead. I'm going to look for a replacement cell and if I can't find one it's all manual baby. After I did the focus on the Mamiya and went back in the Ricoh and rebuilt the rangefinder mechinism. It's a weird set up. a rod from the lens pushes a lever that pivots a mirror. The rod the mirror sits in was binding so a touch of lithium grease did the trick.
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