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 Post subject: Meter movement repair source found
PostPosted: Jun Mon 10, 2019 3:15 am 
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Joined: Jul Sat 23, 2011 9:33 pm
Posts: 935
Location: Long Beach Ms. USA 39560
The tiny hairsprings in moving-coil meters sometimes come loose from soldered connections.
I was talking with a cellphone repairman who described repairing a common defect in a popular model of a popular brand cellphone. There are many connections on the bottom of a chip that can fail and which must be soldered with hot air, but one connection connects to a circuit board trace that almost always fails after the chip is replaced. The cure is to solder a wire to replace the trace. It has to be done under a microscope.

I described the hairsprings in a moving-coil meter and he said it would be an easy job under the microscope to reattach a solder joint. Your local cellphone repairman should be able to fix the hairsprings in a failed meter which cannot be otherwise economically replaced if you disassemble the meter for him and remove the magnet. Another option would be to find a web site with the meter theory for him or her to view.

The impossible again just takes a little while.

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Unhappy tubes blush while unhappy power FETs scatter plastic


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 Post subject: Re: Meter movement repair source found
PostPosted: Jun Mon 10, 2019 3:53 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 18576
Location: Albuquerque, NM 87123
When he actually does the work, and charges you for repairs, let us know.

BTW, disassembling a meter and removing the magnet isn't always easy; that's like saying remove engine from car.


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 Post subject: Re: Meter movement repair source found
PostPosted: Jun Tue 11, 2019 12:02 am 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 8929
Location: Long Island NY
If you have the tools, patience, clean room, and steady hands necessary to fully disassemble and reassemble meter movements, why would you need a cell phone repairman to solder the hairspring?

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