MP IV MICRO Problem

[frigopat]

HI FRIGOPAT HERE
I HAVE A QUESTION ABOUT A MP IV MICRO
WHEN I PUT ON TEST WITH A MPIV TEST UNIT ALL I GET IS ONLY THE LIGHT WORKING AND THE SCREEN IS BLANK ON BOTH TESTS?
CAN ANYONE HELP WITH THIS.
THANKS FRIGOPAT:rolleyes:

[Brian_UK]

OK, without SHOUTING this time please, what is a MP IV Micro and what does it say in the instruction manual?

[frigopat]

Hi brian
it the controls for a thermo king smx ii unit
this is the first time to use this site.

[Brian_UK]

OK, that's fine, I'll move this thread over to the transport section, you might get a better response over there.

Also, welcome, enjoy.

[abbsnowman]

What do you mean by put on a test? Is this installed in a reefer? More detail please.

[frigopat]

What do you mean by put on a test? Is this installed in a reefer? More detail please.
this is a test unit you can buy from thermo king for testing micros

[abbsnowman]

I don't know anything about those testers and don't have one. Thing is, if its in the machine we can go through wiring and properly trouble shoot. Have you tried this in a machine yet? What machine is it out of?

[frigopat]

hi thanks for your reply
If you plug the micro back to the wiring loom in the frigde all the temp sensor will read -75.6 c / amp= -5.5
alarms 2/3/4/5/6 61 50 79.
You can not clear 2 3 4 5 6.
if you put the micro tester on all you get is the screen lights

[abbsnowman]

Sounds to me like you have a problem in the socket that carries the sensor wires.
Although, I see you have a voltage alarm. These don't like low voltage and often spit up lots of various codes. Confirm the micro is getting good voltage.

[clivemtk]

hi thanks for your reply
If you plug the micro back to the wiring loom in the frigde all the temp sensor will read -75.6 c / amp= -5.5
alarms 2/3/4/5/6 61 50 79.
You can not clear 2 3 4 5 6.
if you put the micro tester on all you get is the screen lights
alarm code 61 = low battery voltage

[frigopat]

Thanks for for the info
Changed micro board fridge works fine
did a part exchange with t k.

[abbsnowman]

Good job!
Thank you for letting us know.

[The Fox]

are you useing the correct tester? should be 204-723.
when you connect and power up in test one it will automatically light up all display segments to verify they are all still good, test two will auto test and give a result ,pass or fail. to be honest they are not that good as you may get a pass when they are defective. better to test with a good known replacment if possible.

[frigopat]

Thanks Fox
I found out the hard way .
Not much hair left
Replacement the only answer.