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My Sharp R-9h91b microwave oven stopped working

Your response to my problem was the most helpful, especially including the Sharp service manual for the microwave. For some reason your response disappeared from my posting so I couldn't reply to you through that thread. However, when I went to the manual you sent I determined that Procedures H, I and J to check the monitor fuse, the magnetron temp fuse, and the thermal cut-out were what I needed to do, and none of those procedures were explained in the manual. There is a reference on the first page of the manual you sent that says it is a supplemental Service Manual to the Base Model Service Manual for R-9H60/9H80 (Refer No. is S5814R9A50DA/). Do you have this manual? Also, did you say in your response that you can get parts for this microwave?

Thank you,
Richardbw0

Posted by on

  • richardbw0 Oct 03, 2008

    Dear MicrowaveSvc,

    Thank you very much for all your very explicit and detailed help and explanations. The service manual and the sketches of what the parts look like, with their exact locations and part numbers explained, and the referral to the parts supplier, all made my repair possible. Also, the second test description about shorting out the bad part and powering on just to see if the lights come on made me more confident that I had the right solution. You are very, very good!

    By the way, some of the other responders were quite discouraging about me even attempting to do the repair if it was anything more than the main fuse.

    Richardbw0


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My solution is still visible here: http://www.fixya.com/support/t1083290-sharp_r_9h91b_microwave_oven

But it seems like the site is acting weird or something.

I don't have the other manual, but this repost of my answer covers it all:


Hi, I'm the guy who gave who the service manual link and the long, very detailed answer that covered just about everything that can make a microwave "dead".

You don't actually need the base service manual since this manual has everything you need to locate the parts and the part numbers, as well as the overall schematic.

The magnetron temperature fuse (ref # 1-7, original part # QFS-TA013WRE0) is located in section 3-D of the exploded view on page 25. Physically, it is clipped onto the waveguide above the magnetron and it looks like the right item in the attached drawing.

The oven thermal cutout (TCO) (ref # 1-8, original part # RTHM-A024WRE0) is located in section 2-H of the exploded view on page 25. Physically, it is located on the left side of the chassis near the convection fan assembly and it looks like the left item in the attached drawing.

The best place to order whichever of these you might need is parts is Tritronics. If the part numbers have changed, that will show up on their Web site.

The testing of these parts is simple continuity testing: With your meter on the ohms scale (and oven power unplugged of course) measure the resistance at the terminals of the thermal cutout (TCO). It should read virtually zero. If it reads high / infinity, then it's open and needs to be replaced.

You can also place a jumper or clip lead across the bad (or suspected) device and plug the oven in just long enough to see if it comes to life. Do not cook with the jumper in place, and unplug it right away, avoiding contact with any inside wires or connections.

The schematic on page 4 shows you the "order", if you will, in which the current flows. (Yes, I know it's AC). From the plug, it goes through the oven thermal cutout, then the magnetron temperatuere fuse, then the line fuse.

On that schematic, the very bold black lines show you the essential path required to get power to the board's low voltage transformer, which should result in a lit display assuming the boar dis okay.

If you need more help, please feel free to write me at prototech@usa.net.

If this is not a FixYa, I don't know what is! *grin*

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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