Question about Thermador SC302T Electric Double Oven
Display went dim--can you help
Thermador SC301T and SC302 stack ovens have a weakness in the radial capacitors on the circuit board behind the LED clock. They get cooked from heat. Here is the fix: Remove two screws from the control panel, located facing up at the bottom on the panel frame.. open the oven door to see them. The panel is then held in place by push in toggles at each end, pull towards you to remove. Carefully unplug the three wiring harness plug-ins, and check them to see if any wires are loose. Set the panel aside. Remove 3 screws holding in the LED assembly, and again unplug the wire harnesses, examining each for loose wires at the terminal. When unplugged, take the LED assembly to the bench, remove the plastic housing, and with a mini soldering iron and watchmaker's eyeglasses, or hobby magnifier,
identify, heat, and remove two 35v 450uf 105 degree radial capacitors, and one 35v 68uf 105 degree
capacitor. These are ordered from MCM Electronics (google it) and are p/ns 96K0326 and 96K0331.
Insert new parts, solder and clip excess leads. Carefully examine the printed circuit board around the area of the leads you just soldered, as some boards do not have the copper close enough to the hole to make contact. Scrape the green insulation from the conductor near the hole to expose copper and make sure your solder makes contact with the copper and the lead. Use your multi-tester when finished to check continuity from all leads you just soldered and their nearest neighboring contact on the circuit board. I found a loose wire on the harness to repair, and one contact on a capacitor did not have the copper close enough to make contact without extra effort. When all is completed, reassemble. Turn back on power at the circuit breaker. You may get an F7 error code. Off with the power again, wait 3 minutes. Restore power, go to oven and press the OFF position on the glass control panel... hold for 10 seconds, and the clock should now be steady at 12:00. Push clock position, reset clock for proper time. Test oven light on/off. Test bake/temp/convection buttons,
on/off. This is a good fix, and will save you about $469.00 in parts and $500.00 in labor. The new
105 degree centigrade high temperature radial capacitors replace old 85 degree, which fail, and your repair should last. Total parts and shipping costs.. about $10.00.
Posted on Mar 14, 2009
Those capacitors no one can find at MCM are available at Newark.com (they are manufactured by MCM & carried on MCM site under different part numbers: 96K0331 Newark is 31-7215 MCM; 96K036 Newark is 31-7220 MCM). Price is the same both places -- very cheap. AND you can't buy the display as a unit anymore as Thermador has disconintued manufacturing it, so it's either pay a big bundle to a shop or get handy w/ soldering!
Posted on Mar 30, 2009
First, I want to thank everyone with your information to repair the Thermador SC301. If you want to spend the $171.99 and send the part to CG Industries, that is an easier way out.
I chose the cheap route and ordered up a few capacitors, 68 micro farad 50 V, 470 micro farad 35 V and 22 micro farad 35 V. The originals rated 105 degrees would have cost under $3.00 from Mouser Electronics but I spent under $7.00 for the capacitors to get an extra set and I bought the 135 C degrees for the two 470 mf and the 68 mf but decided not to use that one due to the larger size--a couple of mm larger in diameter. I spent $15 for UPS for 2 days delivery and $10 for a Radio Shack 15 Walt soldering iron. I had some electronic rosin solder from before. It was pretty easy to remove the 4 capacitors trying not to overheat and trying to get the excess solder away from the board so you could mount the new capacitor terminal throug the holes on the printed circuit board. It took over 5 hours to research all of this information but I was able to repair the board and assemble back in less than an hour. I have had 4 years of basic electronics in high school 35 years ago. Most important is to label all the parts such as harnesses and other wiring and know that the capacitors have a polarity indicator printed on the jacket and be sure to mount this correctly.
Posted on Oct 19, 2009
Thank you bonanzapilot, replacing the capacitors worked.
my display is now working
Posted on Sep 19, 2009
For the 35V 68uF 105C capacitor, I have ordered part 31-7190 from MCM. That's the 68uF capacitor which I believe is the correct part. (Part 31-7220 is a 680uF capacitor.)
Posted on Apr 16, 2009
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