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- > Do-It-Yourself Appliance Repair Help > The Kitchen Appliance Repair Forum > Magic Chef MCBR1010S defrost timer function

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Magic Chef MCBR1010S defrost timer function  Rating:  Rating
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 Posted: Wed Jul 21st, 2010 04:49 pm
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2milehigh
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Started with both freezer and frig getting warm. Found ice build up on coils like defrost not working and fan stuck with ice build up. Checked timer (metered) and appears to work OK. It is a 16 hour 8 min timer. When everything is plugged back in the timer motor runs when in, what I believe to be the 16 hour cycle, but the motor quits when it hits the defrost cycle spot. At that cycle should the timer motor itself keep running to cycle through the defrost time frame (assume 8 minutes) pin 3 to 2 and move to a normal cooling cycle pin 3 to 4? Or does the stat on the coil open via heat element and shut down defrost? Have tested stat and it does open and close based on cold and warming it up but not sure it is 100% in spec. Heater does turn on but not sure on how it normally ends and moves to normal cooling

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 Posted: Wed Jul 21st, 2010 05:09 pm
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Your correct, if the coils are clogged and the terminator is cold enough to be closed and you manually advance the timer to defrost and the heater gets hot then the timer is bad. Its normal for the to fail and not initiate the defrost cycle....sometimes they fail in the defrost cycle and won't come out. The terminator only shuts the heater off when the temp. Is reached...the timer should advance on its own.



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 Posted: Thu Jul 22nd, 2010 11:07 am
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Defrost timer part link==> Click



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 Posted: Thu Jul 22nd, 2010 12:52 pm
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Budget Appliance Repair
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I wouldn't be so sure yet on this one that it is a defrost timer issue.

Do you have a wiring diagram that you could post here.

I haven't looked this up but looks to be one of those little Magic Chefs made in some foreign country and they usually work a little different then what you normally expect to see.

8 minutes is a pretty short defrost time so I believe this is one that is set up where the timer actually stops advancing when it goes into defrost then when the defrost terminator opens the power is routed to the defrost timer motor to bring the timer out of defrost mode.



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 Posted: Wed Aug 4th, 2010 07:52 pm
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This is a China made MCBR1010 10 Cubic R/F. There is a very basic schematic I used, and after streching Fluke leads from freezer down to timer to confirm operation, I decided to put the whole thing back together to re-establish starting point. The timer only runs when compressor runs (total 16 hr cycle) and when defrost for approx 8-10 minutes. I put marks on timer to watch for defrost start/stop points. It is now working 100% but timer seems or sounds a bit noisy. So it would appear the timer may have "hung" and having it out and manually rotating multiple times may have wiped it. However still a little suspect and monitor it daily.

Tried to include schematic but didn't do very well. Bottom line was had no voltage to actual timer motor pin one (1) at defrost cycle when I started this and when pin two(2) dropped 115v (compressor). Now I have 115v when I hit the 8 minute cycle. Always had 115v at pin two (2) when cooling called(compressor running) 16 hour cycle. 

Gotta love this Chinese stuff....

Thanks to all for the input

 

 

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 Posted: Sun Aug 22nd, 2010 08:41 pm
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occidental tourist
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I'm having timer troubles with this too.  Another thread if you search the model number when I replaced the defrost temp. sensor and fuse.

During that incident I managed to get Magic Chef to send me a .pdf of the manual which has some theories of ops -- albeit written in broken english. It is 568K so I can't post it here, but send me an email or PM or something and I can send it to anyone who wants it.

What the diagram says is that the motor is normally grounded through the heater, but the timer switch puts 120 across the heater without the timer motor inline. Whether the timer motor still turns in such a scenario I don't know, but I doubt it because of the increased resistance under load of the heating element. Whereas the trickle through the heater to run the motor isn't enough to trigger resistance.

Then, just as Grasshoppeer and Budget suggested when the bimetal element in the thermostat opens on higher temp the time motor picks up again. I'm assuming there is enough differential on the temp. sensor that the timer generally will stay running long enough to get it back into fridge mode before the sensor closes again.

But maybe if the timer gets old or weak that could be a problem. Anyway I'm experiencing that the timer turns but won't make the transitions, so I'm in the market for a new one.  $39 ain't so bad, but I can buy some 8 or 10 hour timers with similar pin outs for $25 locally.  But they aren't labeled as to the length of the defrost cycle and it would appear that under this wiring schematic you need that to be short (I think you timed it at around 8 minutes).  So if anyone can recommend a cheaper timer by those specs I'm all ears.

And, as I said, if you need the schematic just let me know, sorry I can't post.

Brian

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 Posted: Mon Aug 23rd, 2010 01:02 am
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OR post here, then post the link:

http://www.imageshack.us/

 



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 Posted: Mon Aug 23rd, 2010 11:25 pm
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2milehigh
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This thing has been working for over a month after putting it back together! However the timer motor maybe going bad as I now can hear an audible tic..tic..tic that I don't think I used to hear. However this thing has such a crappy rattling fan in it that maybe I just didn't hear the tic before. MC sent me a fan under warranty originally and it was quiet for about 2 days. Then same rattle. Anyhow do know you need the 16hr/8min timer and only 2 places I could find CF2003-56 and MC was the cheapest at $33.95 plus ship I suppose.

Got it bookmarked because I suspect I will be ordering one at some point!

 http://www.mcappliance.com/partorder.aspx

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