And here is the second part of the $1 multimeter deal from the last Hamfest. Together with Micronta 22-201U analog meter reviewed here I picked up this 3.5 digit digital one of a similar age. The poor thing looks like it had a rather difficult life!
Updated 11/2016
Download Micronta 22-025 Dynamic Transistor Checker Manual for model 22-024, slight cosmetic differences from the 22-025, should work the same. Measuring and test equipment,digital multimeters, analog multimeters, Fluke, Wavetek. Service manuals and repair information. Micronta 22 025 user manual compiled pdf, doc, Compiled Documents for Micronta 22 025 User Manual. Updated Instruction Manual Micronta 22 211a: Download Owners Manual Pdf Book for Micronta Multimeter 22 Micronta 22-211 teardown - my first vom - youtube Jul 21, 2013 Please comment on your first VOM or DMM. Micronta 22 191 manual.
A bit of corrosion on the battery contacts
Micronta 22 211 User Manual
One screw and a few clips hold things together:
Case front- buzzer, shielding
Not much to say safety wise- no board slots, MOVs etc:
We may have found a datecode? 1982
Dragon ball z tag vs game download. After cleaning and drying, the meter powered up, but the display segments were very flaky:
If I wiggled the flex things got better. So I took the display off to see what I can do. Big mistake! The paper-thin flex just peeled off the board and now we have a display that is not connected at all! On the other hand we have another datecode confirmation 82-1:
Not sure this damage is reversible- I suppose if somebody sells the conductive tape like this, but what are the odds.
Well, it appears things are not that bad. After reading about 3M Z-tape, I got a hold of some. Mine came from Sparkfun, and has since been discontinued. Adafruit has a similar product and also a nice page with details on how it works, but it’s basically a double sticky tape with vertical conductive channels. Kinda like Zstrip used with segmented LCDs but on a much smaller scale.
Next step was to clean the junk off the board. Flex side proved to be trickier- I had to carefully dissolve some of the paint on the back to get to more conductive ink traces. After that it was all basically peel and stick:
Applying Ztape to the board
Next is the pasting part- remove tape liner, align traces (or what’s left of them) and press:
And finally add a piece of ESD foam to keep things under pressure for better contact
Reinstall the two screws holding the display, and we now have a readable LCD!
It’s alive!
One way to open solder mask
- User manual
- EEVBlog thread
- 3M Z-Tape datasheet
7
Good luck to the repair!
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Micronta 22 025 Manual Briggs & Stratton
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Micronta 22 025 Manual Diagram
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