Hiya all,
I got lot of great advices, and now I've had time to try out some of
them.....
So here's what I tried:
- Asa dial at 100, shutter at B, mount 50/1.8 at 1.8: needle
centered.
- Resistance between meter frame and body: 0 Ohm
- Resistance "through" the meter (blue wire - frame): 1487 Ohm
- Resistance between the "battery tap" and the brown wire: 0 Ohm
All this seemed good. What I then did was:
- check the ground screw, as Clint, John, Mark et. al
suggested (unscrew, scratch, tighten...)
- checked all the solderings on the little circuit board
(resoldered).
- checked the three resistors. From left to right, they are:
R1= 6.9 KOhm, R2= 8.3 KOhm, R3= 14.1 KOhm. None seemed broken.
Sadly, the result is the same - almost. At 1/8s, f1.8, 100ASA, I can
make the needle center when I point the camera directly towards a
lightbulb. Not good ;(
Anyways, other than the generic "Anyone knows what could be wrong?"
(looking for the quick solution, huh?), I am puzzled: the measured values
of the resistors do not correspond quite to those I see in the schematics
of the metering circuits (in particular, R1 seems off) - and not atall to
the resistance indicated by the color codes. Is this normal?
Secondly (and this is a much more trivial question): the foam below the
hotshoe plug had turned into sticky goo. Any domestic products that are
good as replacement? ;)
Thanks again for all kind advice. It's quite fun, but also getting a
tiny bit frustrating...
--
-------------------------------------------
Thomas Heide Clausen
Civilingeniør i Datateknik (cand.polyt)
M.Sc in Computer Engineering
E-Mail: T.Clausen@xxxxxxxxxxxx
WWW: http://www.cs.auc.dk/~voop
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