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How to fix Zojirushi induction rice cooker for $0.59 <YM

(2013-02-23 03:57:17)
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杂谈

分类: 随笔
I have a Zojirushi NP-HBC10 induction rice cooker for over 3 years. It worked very well, everybody likes the rice it made. But as you already guessed, it broke down a couple of weeks ago. The symptom is that the LCD screen still displays clock, but nothing changes when you plug in the power. Of course it doesn't respond to any key press either.

I decide to fix it myself. but when I opened it up, it's definitely more complex than I expected from a rice cooker. It has 4 circuit boards: line filter, power supply, induction driving, control.

How <wbr>to <wbr>fix <wbr>Zojirushi <wbr>induction <wbr>rice <wbr>cooker <wbr>for <wbr>$0.59 <wbr><YM

How <wbr>to <wbr>fix <wbr>Zojirushi <wbr>induction <wbr>rice <wbr>cooker <wbr>for <wbr>$0.59 <wbr><YM

A little bit of google found this from Toshiba's catalog

How <wbr>to <wbr>fix <wbr>Zojirushi <wbr>induction <wbr>rice <wbr>cooker <wbr>for <wbr>$0.59 <wbr><YM



Based on the symptom, it's very likely related to power supply.There's a fuse on the line filter board, so it's the first thing I checked, but it's fine. Then I measure VDD and VCC on the micro-controller board. VDD is around 2.3V, while VCC reads as 1.2V. This is not quite right. I expect VDD should be either 5V or 3.3V.
So this could be caused by power supply, or a faulty micro-controller. Since power supply has more components under stress, its MTBF tends to be shorter. So I started with the power supply board. It's a simple one sided board, the schematics of the main part is like this:


How <wbr>to <wbr>fix <wbr>Zojirushi <wbr>induction <wbr>rice <wbr>cooker <wbr>for <wbr>$0.59 <wbr><YM

I started tracing from the left side. I got lucky when I measured R101's right side voltage: it's 0. I measured R101 itself, it's broken. I found the resister on Digikey for 59 cents. After I replaced it, put everything back together, it starts to work again.

Next in line: I got two Onkyo receivers just stopped working.

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