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Hi_country_flash
Tinkerer
Username: Hi_country_flash
Post Number: 1
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, January 29, 2013 - 01:18 pm: | 
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I have a Leica-Meter --just plain Leica-meter not an M or any thing with batteries. The needle is loose and will move about but it has no reaction to light. Is it a Selenium powered meter? If so could it be repaired with a silicone type cell from Edmond Scientific. Also how does one access the inside of this meter , I took off the bottom plate and then removed 3 or 4 more screws from a black bakelite looking plate there but it would not come off. |
Beepilot
Tinkerer
Username: Beepilot
Post Number: 6
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 28, 2013 - 01:06 am: |
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I have just posted a similar question re the Metraphot 3 meter but no responses yet. Metraphot and Leica meters in many of the models are the same meter. Does yours have two screws on the top front edge of the metal cover. If so remove these and there should be a third which can be exposed through the dial windows. The cover can then be removed leaving the movement attached to the plastic base. If there are no visible screws on the top cover then there is a good chance that your meter is the same as my Metraphot 3 in which case I would be interested in hearing if you have had any success disassembling it. Mine has a centre screw (2 pin holes) which looks to hold the dial assembly in place. Possibly removing the dial might expose some cover screws. Incidentally the book "Leica Camera Repair Handbook" by Tomosy has quite a bit of specific information on several of the Leica meters which you would find useful. |
M_currie
Tinkerer
Username: M_currie
Post Number: 295
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 05, 2013 - 07:32 am: |
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Just as a general thing, selenium cells make their own electricity, and the meter measures the output. Silicon cells change their resistance with light, and require a power source. Not at all the same setup. |
Beepilot
Tinkerer
Username: Beepilot
Post Number: 7
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 06, 2013 - 01:32 pm: |
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Not so. The silicon cells referred to by the original poster do generate small voltages without an external voltage and are commonly used to replace selenium cells. For example see www.thermojetstove.com/Autoeye/meter.htm |
Br1078lum
Tinkerer
Username: Br1078lum
Post Number: 497
Registered: 11-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 06, 2013 - 07:37 pm: |
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Exactly, you can take the silicon solar cell from a small calculator to replace the selinium cell in a Zenit E, with a small potentiometer to achive calibration. Much different than the silicon meter cells M_curie is thinking of.
PF |
M_currie
Tinkerer
Username: M_currie
Post Number: 296
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 07, 2013 - 07:30 pm: |
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My apologies, I was getting confused with later cells - do carry on and let us know if it's feasible. |
