Thread Number: 49208
Whirlpool dryer-sensor dry |
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Post# 712230 , Reply# 3   10/30/2013 at 10:30 (3,802 days old) by DADoES (TX, U.S. of A.)   |   | |
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This model does have moisture sensing per parts diagrams. Run it on auto-dry with no clothes, the timer should advance to off (at normal timing speed) being as there's no moisture to stall it. The little board is Part Number 3390537 --> 8558178. Kinda expensive, SearsParts lists $143.70. RepairClinic.com $90.05 ApplianceZone.com $87.01 PartsDr.com $74.39 Numerous listings on eBay. |
Post# 712289 , Reply# 6   10/30/2013 at 17:11 (3,802 days old) by kb0nes (Burnsville, MN)   |   | |
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Post# 712305 , Reply# 7   10/30/2013 at 18:56 (3,802 days old) by chetlaham (United States)   |   | |
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Post# 712581 , Reply# 9   11/1/2013 at 10:46 (3,800 days old) by kb0nes (Burnsville, MN)   |   | |
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Mitch,
The board should be straightforward to repair if it had a failure. Its a pretty simple circuit and I am looking at photos of the board to reverse engineer it. I'll draw a schematic and post it when I get it done. Looking at the components on the board makes me even more curious as to how this beast functions. I searched the Internet for a copy of the wiring diagram for your model but couldn't locate one. I need to confirm where the 4 wires on the connector go, my assumptions are: O-W is AC power G-Y and Y-R go to the drum sensor strips W-B goes to the control T-W is the Ground If you could shoot a clear photo of the diagram on the back panel (or if anyone has the diagram) it would help. Most likely parts to fail would be one of the diodes , the big electrolytic capacitor, the IC or the switching transistor. The resistors are unlikely failures unless there is visible evidence of failure. The card edge connectors can be a reliability issue too. Finally any idea what your fathers Ham callsign was? I'm a Ham too :) 73, Phil |
Post# 712686 , Reply# 10   11/1/2013 at 20:42 (3,800 days old) by chetlaham (United States)   |   | |
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Post# 712689 , Reply# 11   11/1/2013 at 20:44 (3,800 days old) by chetlaham (United States)   |   | |
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Post# 712808 , Reply# 13   11/2/2013 at 16:11 (3,799 days old) by jetcone (Schenectady-Home of Calrods,Monitor Tops,Toroid Transformers)   |   | |
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Post# 712939 , Reply# 15   11/3/2013 at 09:10 (3,798 days old) by mitch (Atlanta)   |   | |
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Still have some cleaning to do. |
Post# 713669 , Reply# 16   11/7/2013 at 10:32 (3,794 days old) by kb0nes (Burnsville, MN)   |   | |
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A little update on my reverse engineering. I've got the circuit all drawn out but I was a bit unsure of the output device (the TO-92 case transistor looking thing). I was sure it was a TRIAC, so I bought a Ebay board myself to experiment with. Indeed its an MAC97A6 hah!
The circuit is a bit puzzling with its intermittent contact with the clothing during dry. I may have to hook this board into the sensor in my Cabrio dryer and watch how it senses the clothing on the oscilloscope. In any case understanding is progressing... |
Post# 713695 , Reply# 17   11/7/2013 at 13:26 (3,794 days old) by thefixer ()   |   | |
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Here is a link to the wiring diagram for your dryer. CLICK HERE TO GO TO thefixer's LINK |