john neal
fallor ergo sum
Hi,
I just bought a "working" MC meter, but the needle seems to be a bit uncertain at times and sticks in position, plus it can be a bit "deaf" to changes in light levels.
The vendor tells me that it is probably a dry solder joint somewhere inside, and should be easy to fix. I'm hoping that it's not a dying selenium cell. I'm sure I ran across a site a while ago that had some instructions, but I can't find it again, now that I need it!
Does anyone have any experience of gettiing inside and working on the MC?
EDIT: I found one page with info on the MR4 on Mick Feurbacher's site. This explains how to get into the MR meter, the MC should be more straightforward.
To expand on the problem, I get no needle movement on the black (high) range setting, but the red (low) range does work, and gives believable readings (wthout reference at this time to a known good meter) although the needle seems to stick at either end of its travel. I suppose this could be a "lazy" cell, and/or bent needle, but will know more when I have had the top off and checked out things like the needle bearings, switch contacts, resistors and soldered joints.
I'll post pics of the process. Fingers crossed....
I just bought a "working" MC meter, but the needle seems to be a bit uncertain at times and sticks in position, plus it can be a bit "deaf" to changes in light levels.
The vendor tells me that it is probably a dry solder joint somewhere inside, and should be easy to fix. I'm hoping that it's not a dying selenium cell. I'm sure I ran across a site a while ago that had some instructions, but I can't find it again, now that I need it!
Does anyone have any experience of gettiing inside and working on the MC?
EDIT: I found one page with info on the MR4 on Mick Feurbacher's site. This explains how to get into the MR meter, the MC should be more straightforward.
To expand on the problem, I get no needle movement on the black (high) range setting, but the red (low) range does work, and gives believable readings (wthout reference at this time to a known good meter) although the needle seems to stick at either end of its travel. I suppose this could be a "lazy" cell, and/or bent needle, but will know more when I have had the top off and checked out things like the needle bearings, switch contacts, resistors and soldered joints.
I'll post pics of the process. Fingers crossed....
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