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Magic Chef Ice Maker Model MCIM30TS  Rating:  Rating
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 Posted: Fri May 18th, 2007 05:26 pm
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ussessex
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Magic Chef Ice Maker  Model MCIM30TS

My latest project is this countertop ice maker that seems to have some minor difficulty getting started.  I plug the thing in and it runs through a cycle of dumping the tray out but never starts the compressor, cond. fan, or pump.  The only wiring diagram I can find is on the back but it's not a line diagram that I can determine a sequence of events from. 

I am getting power to the control board and have tested the compressor and found it works well.  I basically just ran a temporary hot to it to see it power up and cool the evaporator.  Not sure how to proceed now. 

It may be noteworthy that the machine seems to cycle the dump tray on a 6 minute timer instead of on temperature (ice thickness) like it's under-the-counter brother.

 



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 Posted: Fri May 18th, 2007 05:38 pm
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Samurai Appliance Repair Man
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I'm suspecting an open cold control or thermistor.  But without the wiring diagram, this is just a guess... a damn good guess, mind you, but a guess nonetheless.  :argh:

Can you a nice, clean photo of the wiring diagram?



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 Posted: Sat May 19th, 2007 08:00 pm
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ussessex
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Hope this helps.  Magic Chef hasn't gone out of their way to post any useful documentation on their website.  Guess they want to keep that work in house.

 

Attachment: DSCF2666.JPG (Downloaded 50 times)



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 Posted: Fri May 25th, 2007 10:56 am
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Oops, this one slipped by a little.  OK, you got an overload protector and a start relay ("PTC starter") on the compressor.  I'd start with the relay, pull it off the compressor and shake it.  If it rattles it's bad and that's your problem.  If not, put re-install it and run the unit, using your meter to see if you're getting 120vac on the black line coming into the overload protector.



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 Posted: Tue Jun 5th, 2007 10:13 pm
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Don't worry about the previous delay in responding, I am looking at this in my spare time.  Here we go, The compressor has no power.  The relay is a circuit board mounted one and, with some effort, I was able to determine the following;

There is supply power to one side of the contacts

The coil has 12vac to operate it

The the relay contact nuetral has continuity to the compressor nuetral

Contact wiring was verified by jumping across contacts (comp came on)

 One oddity was that the voltages didn't stay constant on the relay coil. I always see a voltage drop from one side to the other with reference to neutral but have found voltages from 120v, 12v, and 4vac.

I have found that all of the switches that plug into the circuit board have 19vac on both wires but when the unit is unplugged I don't get continuity through any.  I suspect some board trouble because the front panel has an add water light that is not on when it should be, and the ice tray is always down in a dump position and never filled with water.  I would assume that this would need to happen before the compressor start up. 

Are you surprized at the start relays' variing coil voltages? Shouldn't it be on with a voltage drop across the coil or is it possible that the start coil nuetral is held up by some other uncompleted process such as the water tray up and filled?  All of the remaining relays show 6vac on the supply side of the contacts for each of the 120vac appurtenances such as the water pump, gas valve, etc.  I have jumped each of these to verify they work as well.  each did with the exception of the before mentioned tray which won't stop in the correct position to fill.  Almost like it thinks there is ice to be dumped. hmmmm  not sure how to check for that.  I looked at the "ice sensor" but it is a full bin shutoff.   

Help!



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 Posted: Tue Jun 5th, 2007 10:13 pm
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Sorry, I clicked the post button twice

Last edited on Tue Jun 5th, 2007 10:17 pm by ussessex



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 Posted: Thu Jun 7th, 2007 05:46 pm
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Samurai Appliance Repair Man
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Plug the fridge in and turn it one.  Use your meter to see if you're getting 120vac into the compressor relay (AC-L) AND out (to the compressor-- COMP). If you're not, then replace the control board in which the compressor relay is mounted. 



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 Posted: Fri Jan 22nd, 2010 02:00 pm
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ussessex
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sorry I didn't follow up with results sooner.

Replacement board was installed as you suggested and we are still producing ice!

Thanks 



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