Electronic Circuits and Projects Forum

I do not know of that make, but if you provide a model # and a picture (most likely the unit was produced under a dozen different names) someone here will recognize it and will help. In the meanwhile, use a power suply instead of the battery. Measure the current consumption of the few things it does. E

The unit does not have a model number is just call MDTECHPLUS from Matco Tools. I have attached pictures. Let me know if they did not come thru. Thanks for your reply.

I still need help on this unit, the problem seems to be related to the power, a new regular nine volt does not supply enough power. I then tried a new 9 volt Energizer Advanced Lithium battery I get the display to sometimes work but the probes, dial and buttons don’t work.

When I boast the power to about 19 volts the display powers up, and the dial and buttons work, but the probes still don’t work.

Also I noticed that if I put the 9 volt Energizer Advanced Lithium battery after the 19 volt boost I get the display and sometimes the dial and buttons work.

A friend suggested I use a Duracell Procell nine volt battery, is there much of a difference between the 9 volt Energizer Advanced Lithium and Duracell Procell battery?

Any ideas on what to try next would be appreciated.

Thanks in advance.

This is a LONG shot, but believe it or not it CAN sometimes fix problems. Remove the battery and SHORT the battery contacts on the meter side for about 5 minutes.
The fix works for damaged reversibly by ESD.

I fixed an HP calculator and a bike computer that way.

I do suspect bigger problems. Look for protection devices that could have been fried.