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I think I can

Member Since 24 Apr 2012
Offline Last Active Dec 20 2013 01:32 AM

Posts I've Made

In Topic: Measuring Sharp R9H66C convection temp

20 December 2013 - 01:33 AM

That's not obvious at all.  Nor is it correct.  Have you seen the size of these thermocouple wires?  They're tiny-- on the order of 14 gauge wire.  I don't know of a single oven door on the planet with such a tight closing tolerance that it can't accommodate one of these wires. 


Yes, I did look at your original link. Thank you for that.


Both of my multimeters have 14 gauge probe wires. I tried to close them in the door from various angles and it would not close no matter where I positioned the wire or how hard I pushed on the door. Perhaps with some real brute force I could close the door, but I'm not interested in finding out the hard way that I have damaged the door and caused leakage of microwave RF during operation.


I'll look for a thermocouple with perhaps 22 gauge wires. Although my issue with the convection function of this oven has been solved with the repair of the damper. I've cooked several different meals in it since my repair and all are cooking exactly as expected in exactly the amount of time expected.


I'm just a guy with a technical background who likes to fix his own stuff, not a seasoned repair tech. I have not compared the specs, fit or finish of hundreds or even two microwave ovens, but I would think that like mine, they should all have a tight tolerance where the door closes in order to complete what is essentially a faraday cage, preventing the leaking of the microwave radio frequencies from the oven cavity.

In Topic: Measuring Sharp R9H66C convection temp

19 December 2013 - 04:38 PM

Well, that was an interesting diversion. So Samurai, how would you measure the internal temp in this convection oven? Since it's also a Microwave, the door obviously won't allow enough space for a probe wire to hang out and because it's a Convection/Microwave combo oven, the door has to be closed all the way or nothing is going to operate by design.

In Topic: Measuring Sharp R9H66C convection temp

17 December 2013 - 11:58 PM

Still haven't gotten my hands on a laser thermometer (but I do have a source). Here's what I found that hopefully will help someone.


1. Convection Fan Blade wasn't loose, bearing is bad. New bearing, mounting plate, holder plate, pulley and belt are on order. Insides of this thing haven't changed in 18 years, except that bearing assembly has a new version. I used an R-930AK service manual you can get here


2. Found a burned wire end and a loose connector at the heating element neutral side. Cut the wire back, added a new heat-resistant lead and cleaned the element connection.


3. Found a burned wire end at the primary interlock switch common terminal. Cut it back, added a new crimp connector, and cleaned the switch terminals.


4. Found loose connectors and carbon on the common terminals of every switch. Cleaned the terminals and pinched the connectors for a snug fit.


5. Due to loose connectors and carbon buildup on the damper switch common terminal, the damper was not closing consistently in convection mode, allowing heat to escape from the oven cavity into the outer casing. Cleaned the terminals and pinched the connectors for a snug fit. The damper now works as expected and food is cooking in convection mode within the expected amount of time.


6. Thermistor reads almost nothing using both a digital and analogue multi-meter. Service manual says it should be Approx. 350kΩ - 155KΩ @ a room temp of 68˚F(20˚C) - 86˚F(30˚C). So it should be replaced, but Sharp wants $45 for that thermistor. The oven works, registers temperature and cooks food at the set temperature in the expected amount of time. Thermal cut-off isn't kicking in because the service manual says that would shut down the entire oven. So I'm personally going to hold off on that until I get my hands on the laser thermometer to see how far off it is.

In Topic: Measuring Sharp R9H66C convection temp

16 December 2013 - 02:24 PM

Perfect. Thanks for the quick response and good advice. Much appreciated.

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