connorcc2005
Member
Last Activity: 07-10-2024, 11:47 AM
Joined: 06-03-2022
Location: Imperial, Missouri
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Kenmore refrigerator adaptive defrost timer fix. Part: AP4909015
I have a 20 year old Kenmore side by side refrigerator that was acting up with the following issues:[LIST][*]Evaporator coil in the freezer was frozen up.[*]Unit was still holding temperature[*]Evaporator fan would run 2 to 3 seconds on then shut off only to repeat.[/LIST]Defrosted the evaporator coil and began testing. Defrost heater ohmed out good. Defrost thermal switch on the evaporator line in the freezer tested good. Once the evaporator coil was defrosted, the freezer and fridge worked but the fan continued to cycle on and off continuously. I suspect the evaporator coil was destined to... -
Re: Thermistor specs and cross reference
Wow, this is great. Thank you. -
Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
GM, here is the latest on the WFCO 8735 repair.
I took the original battery in and had it load tested. It failed the load test. Not much other detail was provided on why, so I went with another battery. This battery was new June 2021 and has had little use and was on a battery tender when idle.
With the June 2021 battery installed, the WFCO SMPS turns on and goes to 13.6vdc charging the battery. After a couple of hours, I measured the current draw by the battery at 23.4ma. After 12 hours...Leave a comment:
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Re: Thermistor specs and cross reference
Thank you All for confirming the details of this part. If anyone has a legible R-T curve for the TTC-104, please post it or send it to me in a PM. All the datasheets I've seen are so out of focus, you can't read them.Leave a comment:
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Thermistor specs and cross reference
Hi,
I'm getting some conflicting information and thought I'd toss it out to all of you for input.
What I have is a TTC-104 thermistor. This is part of a temp sense circuit that will drive a small 12v fan to cool components mounted to SMPS heat sink.
The physical diameter of the piece is 5.1mm measured with a caliper.
Other than what you see in the pic, there is no other writing on the part.
My research of the TTC-104 says it should read 100 ohms at 25C. Out of circuit measurements have it at approximately 100k. It does change as the temp changes.... -
Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Thanks for your replies RJ and redwire!
I've removed the camper from the circuit and have the charger connected directly to the battery only at this point and the charger stays at 13.65v and never switches to 13.2, even after 24 to 36 hours. I do want to see what the current level is as well. What should the current drop to for the charger to cycle to the next level of 13.2?
I plan to try another battery soon but this project is on hold as a family member is having some health issues.
For...Leave a comment:
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
GM and thank you all for the detail on the updated controller as I am certainly considering the swap to the updated controller!
The supply output is at 13.65vdc consistently, charging the battery and running accessories as it should. There is still a small issue in that the output voltage never switches to 13.2 volts to maintain charge and trickle charge the battery. The constant 13.65v on the battery is cooking the battery. Maybe it is my battery as it is aged at this point?
I know this unit...Leave a comment:
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Hi Shane711 and PeteS,
Thanks for your replies!
The new caps arrived today and installed all of them. The issue was definitely the caps.
Most measured fine but the 22uf by the two ceramic resistors was definitely bad.
Post cap install, the supply fired up first time and was putting out 13.65vdc.
I'm still waiting and wondering when it will drop to 13.2vdc as that hasn't happened yet. I'll see what it looks like in the morning.
Thanks again for your input.
Do you see...Leave a comment:
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Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller
Hi Badcaps readers,
I'm new to the forum and stumbled onto this site today after a great deal of research and troubleshooting of SMPS'. I was looking for detail on the KA3846 SMPS controller when I came across Shane711 post and repair of WFCO supplies.
I have a WFCO WF-8735-P, 2011 vintage, that I'm working to repair. It is supposed to charge the 12v battery and run lights in the camper when plugged into shore power. After a week of camping in Colorado, it quit charging and the 12 volt output is...Leave a comment:
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Re: New Members - please post your introductions here
Hi to all BadCaps members,
Wow, I've been repairing electronics for years and I'm so glad to find this site. I'm glad to see so many people still interested in learning and repairing electronics of all kinds.
I hope to meet you in in a future post.
Thake care,
ChrisLeave a comment:
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