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MEP-804A Low Voltage - Voltage Regulator Question

Scoobyshep

Well-known member
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OK, I got the Fat finger factor on the key board. I also use a German Keyboard and some keys are different. S12 is a switch bot a Frew and HZ is hertz not Hy. I was on Amazon for cheap so shoot me. Its only an HP OMEN with a 17 inch screen for old folks with bad eyes:eek:

You know funny thing about the QWERTZ VS QWERTY Keyboard. We had a system that wouldnt accept the serial key for service. Turns out it was originally setup from the manufacturer in Germany and the few different keys were buggering it up
 

Guyfang

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Burgkunstadt, Germany
Oh, the Libby was the first regulator used in the 15 KW and it matches up with the 60HY regulator in the parts manual and the second one listed has a UOC stating it is for a 400 HZ main gen.

I will translate Army Speak. UOC is Usable On Code. The UOC tells you what part fits what Model. There is the MEP-804A, (60 Hertz model) and the MEP-814A, (400 Hertz Model)
 

LuckeyD

Well-known member
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Vilseck, Germany
YUP! Gettin older too. Gettin grouchier. Forget what I take outa the freezer but remember all the gen stuff for now, and the AC stuff too, and heaters, and M60s, M48s, 113s, D9s, D7s, D5s, MW24C, JD410, cranes, and all the trucks M35 to M916 and HMMWVs and Jeeps. All the stuff in this house, and a few dozen cars. But forget what's in the freezer.
 

LuckeyD

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Vilseck, Germany
Hey, UOC is in the parts manual right up front for everyone to read and match up. GIs never read it so I guess I can't expect the tax payers to do so either. Again a CW4 :unsure::coffee:Warrant Officers job and a CECOM LAR Master tech for the planet was supposed to read it for them like the last 47 years of doing it.:tank::grd: Yes I found the little guys
 

peapvp

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Basehor, KS
OK, but he measured up to 13+ K ohms so I do not believe it ever worked correctly. None of the 5 thru 15s used a 10K pot for an R1.
This maybe a repair kit.
The NSN listing shows 10K pot and 3K resistor for Libby DoD kit
IMG_4682.jpeg
You need to zoom in to see it or use a magnifying glass….
 

peapvp

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Basehor, KS
As an aside:

I used CAGE numbers in my previous posts in this thread and may have to explain this to the Members who are not familiar with US military abbreviations:

CAGE => Commercial and Government Entity
So a CAGE number clearly identifies a manufacturer of a device or apparatus

DLA maintains a publicly searchable database.

My Company, INOVA HIGHTECH Ltd. is also listed in this database and my CAGE Number is 6ZJM5


IMG_4695.png
 

RonK

New member
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Location
Vermont
Thanks for the schematics. Reading the one on the side door is tough when you have your head in the control panel up top!

This one worked until a few weeks ago and then one day it showed low voltage when it was started.
 

RonK

New member
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Vermont
I have noticed that there is an "aftermarket" VR which has its own voltage pot and does not use T1 available.
Has anyone ever used one just in case either the VR or T1 is the problem?
 

Scoobyshep

Well-known member
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A generator avr is nothing more than a fancy power supply. There are aftermarket ones available, you just need to do some engineering to make it work.

Sent from my SM-S908U using Tapatalk
 

RonK

New member
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Location
Vermont
A generator avr is nothing more than a fancy power supply. There are aftermarket ones available, you just need to do some engineering to make it work.
I tend to separate fun engineering projects where I prove that I am smart from making things work so that someone else can maintain
whatever I have done. I design broadcast equipment. Many of the products I design are purchased to replace bailing wire and duct
tape "designs" done by someone who figured they could do it with a relay and a Radio Shack alarm clock. Since I know about
Radio Shack you now know that I am not a spring chicken making it even more important for me to consider the next person who might
have to repair it! :)
 
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