Electronics > Repair
Solartron 7061 7.5 Digits Multimeter Teardown and Repair
Kurets:
To hijack the thread a little. My unit has a NiMH battery fitted, replaced 2017 according to a sticker on the unit. I see that there is quite some corrosion which I have tried to clean up with vinegar, but did not clean-off the soldermask etc.
I am thinking of installing a supercap like described above, but I was also thinking that an alternative option would be to install a lithium cell and and replace R501 with an LTC4054 set to low charging current (50mA or so). I guess changing one battery for another would have the same problem in the end? But wouldn't a supercap also be a leakage risk? I don't know the relative nastiness of the different solvents used.
coromonadalix:
supercap would not be a problem if you respect it's operating voltages ...
ok we did saw some leaked ones in the past, never saw on modern ones ...
the higher capacity it as, the longer it needs to be charged ...
unseenninja:
--- Quote from: Kurets on December 09, 2024, 11:47:04 am ---To hijack the thread a little. My unit has a NiMH battery fitted, replaced 2017 according to a sticker on the unit. I see that there is quite some corrosion which I have tried to clean up with vinegar, but did not clean-off the soldermask etc.
--- End quote ---
That may come back and bite you. As I said, the battery electrolyte seeps under the resist and keeps on spreading. I first used some dilute spirit vinegar, then lots of water and finally isopropyl alcohol.
As the supercap I used is rated at 5.5V, way above the nominal battery voltage, there's very little chance it will leak.
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