- Maytag stove just displays OFF. - 7 Updates
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| David Farber <farberbear.unspam@aol.com>: Aug 02 12:17PM -0700 On 8/2/2019 12:43 AM, Rheilly Phoull wrote: > What type of interconnect (If any) is used to connect the clock? > Is that self contained or run from the cpu? Sounds like a connection > problem for the clock mebbe? Here is photo of the control board: https://www.partsimple.com/whirlpool-5760m185-60-wp5760m185-60-range-electronic-control-board.html If you click on the photo, you can see a very clear and enlarged picture of it. The display tube is soldered onto the backside of the pc board. The ribbon cable connector on the left side of the board connects to the keypad. I did discover that the big 1K 3W(?) resistor in the middle of the board is reading 1.4K. Can you determine from the picture what wattage it is? The DC voltage drop across it is about 20V but that's without any of the external cables hooked to it. I just have input going to L1 and Neutral on my test bench. I'm going to trace the foil on the board and see if I can figure out where the main DC supply is. All voltages on the secondary side of the transformer are measuring negative with respect to the chassis ground (the screw near the x'former) so that's probably not really ground. Now for some really strange observations: With the control board removed from the oven and hooked up to AC from my bench, the display did exactly the same thing. There were no other external connections to the board. I just wanted to see if the clock would work. It didn't. That's when I started checking voltages. The very first thing I checked was the voltage drop across the 1K resistor I previously mentioned. After removing my test leads from the resistor, about 5 seconds later, the circuit board's speaker started beeping loudly. I quickly looked at the display and it displayed, F1. That's the generic code for controller or keypad failure. At least it was able to display something other than "OFF." I powered it off and back on again only this time the time appeared and it was keeping accurate time. However, I was not able to actually set the time. It displayed 2:13 for whatever reason. I read the owner's manual trying to see if any of the other buttons might work and I found that if the display is showing some other function, for example cooking temperature, pressing "Clock" will restore the time display. So I pressed "Bake" and the display switched to oven temperature which read "000" which is normal because it's waiting for your to press the arrow up button to set the oven temperature. Instead I pressed the "Clock" button and then and only then was I able to set the time of day. Now I figured that whatever glitch that locked up the CPU, was now cleared. I powered it off and back on again and the result was... back to the "OFF" display. Again I measured the voltage across the resistor and again the alarm went off. Powered it off and back on again and then the time appeared. To make an already too long story shorter, I am still not able to get the control board to display the time when it's first powered up. I want to replace that resistor but I have a feeling that even though it's reading 40% too high, it might not make any difference. I'm off to my shop now to parallel that out of tolerance resistor to bring it back down to 1K and see if that helps at all. Thanks for your reply. -- David Farber Los Osos, CA |
| Rheilly Phoull <rheilly@bigslong.com>: Aug 03 07:21AM +0800 On 3/08/2019 3:17 am, David Farber wrote: > -- > David Farber > Los Osos, CA I'd say it's 1 or 2 watt, if it gets really hot there looks enough room for a larger one, but while you are at the shop why not replace it and also the electrolytic as well ? |
| John Robertson <spam@flippers.com>: Aug 02 04:55PM -0700 On 2019/08/02 12:17 p.m., David Farber wrote: >> problem for the clock mebbe? > Here is photo of the control board: > https://www.partsimple.com/whirlpool-5760m185-60-wp5760m185-60-range-electronic-control-board.html Hmm, single-sided PCB, eh? Resolder all connectors and larger item attached to this PCB - look for cracked solder traces. I expect that because this is single-sided PCB that cracked traces will be found. I fixed my KitchenAid stove recently by simply resoldering the ribbon connector to the underside of the PCB. Don't get to involved in troubleshooting before you do an inspection of the solder connections please! Good luck! John :-#)# Vancouver, Canada > If you click on the photo, you can see a very clear and enlarged picture > of it. ... |
| Rheilly Phoull <rheilly@bigslong.com>: Aug 03 08:07AM +0800 On 3/08/2019 7:55 am, John Robertson wrote: >> -- >> David Farber >> Los Osos, CA Yup, thats a given !! |
| David Farber <farberbear.unspam@aol.com>: Aug 02 06:01PM -0700 On 8/2/2019 5:07 PM, Rheilly Phoull wrote: >> John :-#)# >> Vancouver, Canada > Yup, thats a given !! The soldering looks fine but I'll touch up the connections again. Do you think without the igniters, oven fan, and temperature probe being connected to the control board, that that would affect the clock? I noticed there's an EPROM on the pc board and I'm wondering if that might have been corrupted. Thanks for your reply. -- David Farber Los Osos, CA |
| John Robertson <spam@flippers.com>: Aug 02 08:33PM -0700 On 2019/08/02 6:01 p.m., David Farber wrote: > -- > David Farber > Los Osos, CA EPROMs are pretty robust, so I'd be more suspicious of the electrical connections, then electrolytic capacitors in the power supply, and work outwards from there. There may be a repository of EPROM images for your appliance - try hunting for the make, model and EPROM and see what turns up! Assuming you can read yours that is! John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. MOVED to #7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 (604)872-5757 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
| David Farber <farberbear.unspam@aol.com>: Aug 03 08:47AM -0700 On 8/2/2019 8:33 PM, John Robertson wrote: > hunting for the make, model and EPROM and see what turns up! Assuming > you can read yours that is! > John :-#)# Hi John, I don't have an EPROM reader/programmer and therefore I've come to the end of the troubleshooting road with this board. I've looked over every connection with magnifying glasses, checked the ESR of the two electrolytic caps, and have exhausted all my tricks. By the way, the chassis ground with respect to Vcc is -5V. Therefore, anything that reads 0 volts is Vcc. I'm going to order a used control board because you can only go so long without being able to use your stove! Thanks for your reply. -- David Farber Los Osos, CA |
| Tim R <timothy42b@aol.com>: Aug 03 06:25AM -0700 On Thursday, August 1, 2019 at 4:32:23 PM UTC-4, Fox's Mercantile wrote: > Jeff-1.0 > WA6FWi > http:foxsmercantile.com My daughter always tells me "never engage crazy." So this will be stupid. But I'll do it once - one and done. The world is safer now than in the past 10,000 years. There are a lot of reasons for that, I can give you some references if you're interested. Some people here are - the Web in general doesn't contain them. One of the strongest influences is the confidence that government is in control. (I'm grossly oversimplifying here.)(Read this for a more nuanced take: https://www.amazon.com/Better-Angels-Our-Nature-Violence/dp/0143122010) The message open carry sends is: the world is dangerous and scary, we can't trust the government, it's everybody for themselves. The more that message is sent, the more dangerous the world does become. Culture always trumps rules and process. |
| "Paul Hovnanian P.E." <paul@hovnanian.com>: Aug 02 08:18PM -0700 micky wrote: > Is there some topographical map underlying the google maps, Several. USGS probably releases topographical data. There is also data from the Shuttle Radar Topography Mission (SRTM). See: https://www2.jpl.nasa.gov/srtm/ Several projects attached to the Open Street Map project inculde tools to integrate SRTM data into maps installable on various GPS devices. -- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------ Write a wise saying and your name will live forever. -- Anonymous |
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