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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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DMM TENMA 72-7755 failure when cold
Hello everybody
I've found an issue with my DMM TENMA 72-7755. When external temperature is below around 10°C it doesn't power on : LCD begins to lit on but finally slowly stops and the DMM doesn't beep. Of course battery cell is correct and after a few minutes at higher ambient temperature it runs correctly. Anybody has the schematic of this device. I guess some capacitor may be particulary sensitive to temperature but without original value I'm sure to replace it. Thanks in advance |
#2
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DMM TENMA 72-7755 failure when cold
On Dec 21, 12:52*pm, JML wrote:
I've found an issue with my DMM TENMA 72-7755. When external temperature is below around 10°C it doesn't power on : LCD begins to lit on but finally slowly stops and the DMM doesn't beep. All the digital parts should handle that temperature fine, only the battery (electrochemistry) and LCD contrast (again, electrochemistry) are likely to change. Keep the DMM inside your jacket until it's time to use it. |
#3
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DMM TENMA 72-7755 failure when cold
"whit3rd" wrote in message ... On Dec 21, 12:52 pm, JML wrote: I've found an issue with my DMM TENMA 72-7755. When external temperature is below around 10°C it doesn't power on : LCD begins to lit on but finally slowly stops and the DMM doesn't beep. All the digital parts should handle that temperature fine, only the battery (electrochemistry) and LCD contrast (again, electrochemistry) are likely to change. Keep the DMM inside your jacket until it's time to use it. And then theres the old cold spray method :-) -- Regards .............. Rheilly P |
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