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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Problem with electric oven temperature control
Hi,
The baking part of my electric oven is out of temperature control. That is, the temperature is always higher than I set. I find the temperature sensor on the back of the oven does not hold rigidly. Today, I unscrewed the four screws of an iron plat in the back of the oven. I found the thick copper wire from the sensor was loose. And the wire is a single one, there is a quite some length bare copper wire in a bundle before the last covered green plastic. I wonder the stick sensor just conduct temperature, not electrical signal? The upper four coils work fine. What's the problem with the baking temperature control? I did not find the content in the website of http://repairfaq.ece.drexel.edu/REPAIR/ Thanks in advance |
#2
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Problem with electric oven temperature control
"fl" wrote in message oups.com... Hi, The baking part of my electric oven is out of temperature control. That is, the temperature is always higher than I set. I find the temperature sensor on the back of the oven does not hold rigidly. Today, I unscrewed the four screws of an iron plat in the back of the oven. I found the thick copper wire from the sensor was loose. And the wire is a single one, there is a quite some length bare copper wire in a bundle before the last covered green plastic. I wonder the stick sensor just conduct temperature, not electrical signal? The upper four coils work fine. What's the problem with the baking temperature control? I did not find the content in the website of http://repairfaq.ece.drexel.edu/REPAIR/ Thanks in advance A brand and model number may get you more responses. |
#3
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Problem with electric oven temperature control
On 15 Dec 2005 13:36:58 -0800, "fl" wrote:
Hi, The baking part of my electric oven is out of temperature control. That is, the temperature is always higher than I set. I find the temperature sensor on the back of the oven does not hold rigidly. Today, I unscrewed the four screws of an iron plat in the back of the oven. I found the thick copper wire from the sensor was loose. And the wire is a single one, there is a quite some length bare copper wire in a bundle before the last covered green plastic. I wonder the stick sensor just conduct temperature, not electrical signal? The upper four coils work fine. What's the problem with the baking temperature control? I did not find the content in the website of http://repairfaq.ece.drexel.edu/REPAIR/ Thanks in advance The typical oven thermostat uses a bulb type thermometer/thermostat that feeds a diaphragm or Bourdon tube back at the control. Bourdon tube is a coiled flattened tube that wants to straighten out when pressure is applied to it. Most ovens still use a fluid filled bulb that transmits pressure directly back to a pressure switch located in the control. When you turn the knob on the control, you are adjusting a cam that changes the position of the contacts inside. The sensor/sender is a larger copper tube (the bulb portion) that feeds into a capillary copper tube (your large copper wire - is a tube) that runs to the control. To calibrate it - There are two methods that are used. One is the knob pointer itself - pull the knob off and look at the back of it. There will be a screw and slot that allows the pointer to move (with respect to the knob and shaft) set it higher to reflect the actual temperature. (the temperature scale is part of the control panel - and the knob only fits the shaft in one orientation only - "half moon" flatted shaft) The second method is a pair of slotted holes in the control panel that allow the whole control to change position with respect to the scale - adjust it to reflect the real temperature. -- ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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