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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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Kenmore microwave 99921
This one's for the archives.
My microwave is a Kenmore, model #99921 (564.9998210) with a Sanyo 11355 controller board. Symptoms were that the light would come on with the door open, but the only activity out of the display was to show a 0. Solution - electrolytic filter cap on the downstream side of the bridge rectifier coming in from the power supply transformer. I think it was 4700 uf @ 35v. It had failed to the point that one of the leads was no longer attached inside. Replaced it and all appears to work just fine. What's interesting is that when the uP got a voltage supply that apparently had a bit too much ripple on it, rather than totally shutting down or frying, it displayed a call for help by still showing something, rather than a blank screen. WT |
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Kenmore microwave 99921
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That is quite interesting. I bought this one about 1984, and after probably
4-5 years I had to replace the magnetron. The only other issue (other than the current one) has been with the piezo beeper on the circuit board. It started sounding raspy, like it had a cold, you know, and then gradually got worse until it quit. Personally, I prefer it without the beep as I find it annoying, but the family complains. I have looked for a 3 wire piezo, but haven't found one. I also can't see $100+ to replace the circuit board just to make noise. :-) My temp probe has never been a problem, but I also don't think it's ever been used. WT "Mistress" wrote in message . .. In article , says... My microwave is a Kenmore, model #99921 (564.9998210) with a Sanyo 11355 controller board. Symptoms were that the light would come on with the door open, but the only activity out of the display was to show a 0. Gosh! Someone else still has one of these Sears microwaves. Mine is still going strong after all these years. I have been through three magnetrons and two HV caps and countless temp probes though. |
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"Wayne Tiffany" writes:
That is quite interesting. I bought this one about 1984, and after probably 4-5 years I had to replace the magnetron. The only other issue (other than the current one) has been with the piezo beeper on the circuit board. It started sounding raspy, like it had a cold, you know, and then gradually got worse until it quit. Personally, I prefer it without the beep as I find it annoying, but the family complains. I have looked for a 3 wire piezo, but haven't found one. I also can't see $100+ to replace the circuit board just to make noise. :-) My temp probe has never been a problem, but I also don't think it's ever been used. Digikey or Mouser or Jameco (forget which, maybe all) have 3 wire piezos for a buck or two. --- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/ Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/ +Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm | Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html Note: These links are hopefully temporary until we can sort out the excessive traffic on Repairfaq.org. Important: Anything sent to the email address in the message header is ignored. To contact me, please use the feedback form on the S.E.R FAQ Web sites. |
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Considering it's 20 years old, maybe it's time to upgrade?
-Isildur's Bane On Mon, 16 Aug 2004 07:13:01 -0500, "Wayne Tiffany" wrote: That is quite interesting. I bought this one about 1984, and after probably 4-5 years I had to replace the magnetron. The only other issue (other than the current one) has been with the piezo beeper on the circuit board. It started sounding raspy, like it had a cold, you know, and then gradually got worse until it quit. Personally, I prefer it without the beep as I find it annoying, but the family complains. I have looked for a 3 wire piezo, but haven't found one. I also can't see $100+ to replace the circuit board just to make noise. :-) My temp probe has never been a problem, but I also don't think it's ever been used. WT "Mistress" wrote in message ... In article , says... My microwave is a Kenmore, model #99921 (564.9998210) with a Sanyo 11355 controller board. Symptoms were that the light would come on with the door open, but the only activity out of the display was to show a 0. Gosh! Someone else still has one of these Sears microwaves. Mine is still going strong after all these years. I have been through three magnetrons and two HV caps and countless temp probes though. |
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#7
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Upgrade??? Surely you jest. True, there's a point, but as long as I can
fix it for pennies, that's my plan. It's a good, solid microwave with enough features to be worth saving. Now, if the magnetron fails again, then I'll probably call it quits. Then I'll send it to "Mistress" for parts for hers! :-) WT "Isildur's Bane" wrote in message ... Considering it's 20 years old, maybe it's time to upgrade? -Isildur's Bane On Mon, 16 Aug 2004 07:13:01 -0500, "Wayne Tiffany" wrote: That is quite interesting. I bought this one about 1984, and after probably 4-5 years I had to replace the magnetron. The only other issue (other than the current one) has been with the piezo beeper on the circuit board. It started sounding raspy, like it had a cold, you know, and then gradually got worse until it quit. Personally, I prefer it without the beep as I find it annoying, but the family complains. I have looked for a 3 wire piezo, but haven't found one. I also can't see $100+ to replace the circuit board just to make noise. :-) My temp probe has never been a problem, but I also don't think it's ever been used. WT "Mistress" wrote in message ... In article , says... My microwave is a Kenmore, model #99921 (564.9998210) with a Sanyo 11355 controller board. Symptoms were that the light would come on with the door open, but the only activity out of the display was to show a 0. Gosh! Someone else still has one of these Sears microwaves. Mine is still going strong after all these years. I have been through three magnetrons and two HV caps and countless temp probes though. |
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On Tue, 17 Aug 2004 01:16:16 GMT, Isildur's Bane
put finger to keyboard and composed: Considering it's 20 years old, maybe it's time to upgrade? Upgrade to a new microwave for want of a $2 piezo? I should hope not. -Isildur's Bane On Mon, 16 Aug 2004 07:13:01 -0500, "Wayne Tiffany" wrote: That is quite interesting. I bought this one about 1984, and after probably 4-5 years I had to replace the magnetron. The only other issue (other than the current one) has been with the piezo beeper on the circuit board. It started sounding raspy, like it had a cold, you know, and then gradually got worse until it quit. Personally, I prefer it without the beep as I find it annoying, but the family complains. I have looked for a 3 wire piezo, but haven't found one. I also can't see $100+ to replace the circuit board just to make noise. :-) My temp probe has never been a problem, but I also don't think it's ever been used. WT - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
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