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Cen-Tech Seven Function Digital Multimeter . Model number 90899.

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In the Multimeter AC & DC 200 volt not working properly

Seven Function Digital Multimeter AC & DC 200 volt not working properly

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Hi Kuntal,

Your multimeter is actually a very simple device. The different functions are implemented by using a series of connectors on the dial that make or break circuit connections on the printed circuit board. Chances are good that you've just got a bit of dirt or corrosion on some of the circuit traces and cleaning may well fix the problem.

Here are the contacts on the dial itself.

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And here are the traces on the circuit board where those contacts make connection.

Block Image

Use this guide to remove the motherboard.

Cen-Tech Seven Function Digital Multimeter Circuit Board Replacement - iFixit Repair Guide

Now take an ordinary pencil eraser and go over those circuit traces on the circuit board and make sure they're all nice and shiny. If there's corrosion, remove it with some fine sandpaper. Give the contacts on the dial a light brush with some sandpaper, reassemble and see if that solves your problem.

If it still doesn't work come on back and let us know and we'll figure out what to do next.

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Kuntal Chakraborty será eternamente grato(a).
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