Mep 002a voltage

[Chainbreaker]

If you haven't already you need to download the Technical Manuals for your unit and become familiar with them. You can find detailed illustrations, schematics with terminal #'s, part #'s, etc. for the items you are troubleshooting.

At the top of this thread select > "Home" and then under the > "Technical Manuals" section you will find all the TM's for the MEP-002a.

 

[Ray70]

The 2 big black things with the holes and the main AC wires looped through it are CT1 and CVT1
The one closest to you is the CVT1, the one behind is the CT1
You need to disconnect the small wires by removing the screws and test per the TM and see how your resistance readings compare.
Don't be overly alarmed if you see a small difference because you might have a little added resistance in your meter and leads, unless you can zero it out. If you are off substantially, that would be a problem.

 

[RJM27]

Thanks

 

[Guyfang]

Take your time removing the nuts that hold the wires on. Sometimes its not a bad idea to spray them a tad with WD-40 or something like that. Give it a chance to work. I have broken off several, more then several, of the connections I started using penetrating oil.

 

[RJM27]

Take your time removing the nuts that hold the wires on. Sometimes its not a bad idea to spray them a tad with WD-40 or something like that. Give it a chance to work. I have broken off several, more then several, of the connections I started using penetrating oil.

Will do, have plenty of PB blaster, let it soak. Thanks

 

[RJM27]

Found it!! Thanks to all for your patience & guidance. The resistance reading between c1-c2 002.0

 

[Triple Jim]

If you mean 2.0 ohms, that's a problem. Check the "-34" TM, but as I remember that resistance should be 9.6 ohms plus or minus 0.96 ohms.

 

[RJM27]

I believe so

 

[Triple Jim]

That photo shows you measuring the resistance at the wires. You need to measure it on the C1 and C2 terminals on the transformer. You're checking the transformer winding.

 

[RJM27]

With the wires hooked up or in hooked

 

[Triple Jim]

At least one wire must be disconnected or you're not measuring only the transformer winding.

 

[RJM27]

At least one wire must be disconnected or you're not measuring only the transformer winding.

And this is on the black cvt

 

[Triple Jim]

I thought that's what we were talking about all this time.

 

[RJM27]

We have, I just lack the expertise in this, thanks for your tolerance!

 

[Guyfang]

Hey! Lets cut the man slack!! We old folks got to stick together! Your getting it.

 

[RJM27]

Thanks, it’s probably karma for areas where I get it and can’t understand why others struggle! Not easy being easy! You guys have always come through & made it happen! BTW Happy Mother’s Day

 

[Triple Jim]

I can't see what scale the green meter is set to in that last photo. It's reading 0.8.

 

[Triple Jim]

I just went out to my MEP-003A and looked. You're on CT1. CVT1 is the one that's away from where you're sitting when you look at the pair. CT1 should have "CT1" molded into the housing facing you. That's the wrong one.

Put those wires back on and find C1 and C2 on CVT1. I found a diagram someone drew that shows the terminals. Locate screw terminals C1 and C2 and verify you have the correct terminals by finding the markings near them, molded into the plastic. Remove the wire from one of them and measure the resistance between those two screw terminals on the transformer. You may have to remove the wires from both of the terminals so you can see the "C1" and "C2" molded into the plastic, therefore indicating you have the correct ones.

 

[RJM27]

I just went out to my MEP-003A and looked. You're on CT1. CVT1 is the one that's away from where you're sitting when you look at the pair. CT1 should have "CT1" molded into the housing facing you. That's the wrong one.

Put those wires back on and find C1 and C2 on CVT1. I found a diagram someone drew that shows the terminals. Locate screw terminals C1 and C2 and verify you have the correct terminals by finding the markings near them, molded into the plastic. Remove the wire from one of them and measure the resistance between those two screw terminals on the transformer. You may have to remove the wires from both of the terminals so you can see the "C1" and "C2" molded into the plastic, therefore indicating you have the correct ones.

View attachment 799448

Meter set on 200

 

[RJM27]

Meter set on 200

This meter fluxes between 000.3-000.7