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Peterinbrussels
Tinkerer
Username: Peterinbrussels
Post Number: 1
Registered: 11-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 29, 2012 - 11:28 am: | 
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I have a Nikon F2 with the 'A' prism/light meter. At first I thought the light meter was dead - I put in a fresh 3v battery and got no response from the meter.
Unlike some metered prism heads, this one is powered via the body - the battery goes in the body, not in the head itself.
I tried something else - I used wires and clips to connect the battery directly to the meter - the meter works fine, reacts to light, etc.
Back to the body - fresh battery measuring 3v, but when I check the voltage at the contacts that go out to the prism/meter I get 2.2v. Not enough to run the meter? Why is it less that 3v?
As I watch the reading it goes down to 2.19v, 2.18v, 2.17v, etc. Keeps going down, about .01v per second. Still going down at 1.98v.
Anyone know what's going on here? |
Finnegan
Tinkerer
Username: Finnegan
Post Number: 245
Registered: 09-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 29, 2012 - 05:07 pm: |
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Sounds like a short draining the battery. Maybe a wire has worn through the insulation and is touching part of the metal frame. |
Peterinbrussels
Tinkerer
Username: Peterinbrussels
Post Number: 2
Registered: 11-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, November 30, 2012 - 09:20 am: |
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UPDATE!
Part of the battery box was broken, so while the contact was touching the battery it was still sort of loose and the back end was touching other parts of the camera inside.
Getting to the problem meant removing the mirror box , which turned out to be surprisingly easy. No need to remove top or bottom plates. just peel off the front leatherette, undo several screws and the mirror box slides right out in one piece - no wires to unsolder.
From there, the broken part on the backside of the battery box was visible. I undid the wires, cleaned a rusty contact, epoxy glued the broken plastic part, waited overnight and then put everything back together. Perfect working order.
Peter |
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