Multimeter UNI-T UT55 problem
If you have a UT55 and blow a fuse, be careful how you take it apart! I had the bad luck that when I took the back off, the circuit board stuck to the front - and I stupidly took some screws out of t...
Forum Discussion
If I buy another one, the first thing I will do is open it up to see how to fix this one! Not bad - two good meters for $50!
Thank you! The meter was a Christmas present so no wear on the contacts yet. Two will cut down on the trials.
If anyone has me of these meters and is thinking of having a look inside the black range selector, I suggest
- hold the circuit board upside down while you take out the four screws. The black range selector mechanism can't fall apart that way!
- hold the dial handle projecting downward as well as the big circular part (which is a cover for the dial itself) as you take the circuit board away. Put a couple pieces of tape on to hold the inside and outside together.
- take a picture in case something goes wrong and a clip contact pops off. Don't set it down - just hold it.
- reassembly: remove the tape and hold just as in the picture above but you need to get a finger or thumb above the board and a another on one of the nuts below while you put a screw in. You're safe after two screws are in.
Should the mechanism pop apart, it isn't all that hard to put it back together. Position the two ball bearings so they are touching the springs in the holes. Orient the rotor part so the two square holes allow you to see the ball bearings through them. Also turn so the ball bearings will be on an indent in the tooth pattern around the outside. I tilt slightly and push one side in place before the other but it may also work doing both sides at once. It actually pops into place without any fooling around adjusting the ball through the hole with a little screwdriver.
Gene&Ginny wrote:
I don't know anything about that particular meter but here are a couple of ideas.
1) Look for wear marks on the circuit board to indicate where the springs may have traveled.
2) Most likely no 2 springs travel in the same circle on the circuit board. The picture seems to show 2 on the outer circle of the selector.
Thank you! The meter was a Christmas present so no wear on the contacts yet. Two will cut down on the trials.
If anyone has me of these meters and is thinking of having a look inside the black range selector, I suggest
- hold the circuit board upside down while you take out the four screws. The black range selector mechanism can't fall apart that way!
- hold the dial handle projecting downward as well as the big circular part (which is a cover for the dial itself) as you take the circuit board away. Put a couple pieces of tape on to hold the inside and outside together.
- take a picture in case something goes wrong and a clip contact pops off. Don't set it down - just hold it.
- reassembly: remove the tape and hold just as in the picture above but you need to get a finger or thumb above the board and a another on one of the nuts below while you put a screw in. You're safe after two screws are in.
Should the mechanism pop apart, it isn't all that hard to put it back together. Position the two ball bearings so they are touching the springs in the holes. Orient the rotor part so the two square holes allow you to see the ball bearings through them. Also turn so the ball bearings will be on an indent in the tooth pattern around the outside. I tilt slightly and push one side in place before the other but it may also work doing both sides at once. It actually pops into place without any fooling around adjusting the ball through the hole with a little screwdriver.
