IR3M02 from Sharp Corporation. Find the PDF Datasheet, Specifications and Distributor Information. IR3M02 Pulse Width Modulation Type Switching Regulator Contrl ic. Details, datasheet, quote on part number: IR3M Electronic component datasheet for IR3M02 manufacturer SHARP. Free doqnload!.

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Most of the small caps i have replaced. Fan doesn’t spin now, but the the whole start-up circuit is disabled.

Then check the AC across each of the main filters individually.

I am going to replace them though. I will try to do the photo tomorrow. Good Idea I am going to try to get an early nights sleep to night. Solder J1 then unsolder one end of D5 and D6. So i suppose putting 18VDC into the circuit after the diodeshould power it.

I don’t think any caps are shorted, just open. The first involves changing the line AC to to DC, so there’s typically a bridge rectifier and a ir302 capacitor s. That it’s part of a tank circuit is the reason for the non-polar.

If not, check whatever the device is highlighted in blue. Be sure and measure the AC across C1 and C2 which should be the same. From the source above I have narrowed it down to the control section. I still advise being accurate on it’s value.

Is it my eyes or do those main caps look bulged? Then check the comparator ICs, each probably contains two or more comparators, each has two inputs and one output. In your bridge the upper right diode and the lower left are drawn backwards.

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(Datasheet) IR3M02 pdf – Pulse Width Modulation Type Switching Regulator Contrl IC (1-page)

Both cathodes should irm302 pointing to C1, both anodes should be pointing to C2. That sounds like it’s running correctly, did you get a kick from the fan?

The datasheet i found for it is dreadful quality. If dattasheet, then you have a short on the secondary circuit. Oh and BTW the green earth wire is not connected to the chassis, as i assume this grounds the output section. Seem to recall something about cutting it when you are trying to get two PSU’s to output 24V in series.

I have sketched out some of the PSU diagram and I am a bit confused: I’m out of ideas but thinking you may be right that the primary of T1 is shorted. I had a look through my parts bin, to find a 2. Because the stuff coming off of the transformer is high-frequency, you don’t need nearly as large a smoothing capacitor than you would if you were dealing with line frequencies.

Ir30m2 learning dtasheet lot though. This i hope will power the controller and hopefully get the thing going. A schematic and a scope would be needed to narrow it down further. Each of T2 and T3 is connected to a power transistor, datssheet the other side of T2 and T3 lead back to the control circuitry.

They are electrically parallel. Otherwise I think you will have a difficult job in reviving your power supply.

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IR3M02 datasheet

Look at the sample Chuck provided. I replaced some caps around there too. I will have a look at it tomorrow. So other than dodgy caps, what can go wrong?

Not exhaustive datadheet the best i can do. The only thing that makes sense theoretically is if the thermistor TR1 is open but it looks like you read 1 ohm? Connecting the V supply has no effect.

I have looked through a few different diagrams of PSU design and not seen anything like this. Is that across the AC mains? Just googling that IC brought up some diagrams that are quite similar but not the same. If one of those fails, it’s usually as a short. Here are his 1.

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Yup some manufactures put the value on the cap as is, 2. Thanks Chuck Gnow for a question you may have guessed coming: That’s like an 80V loss which seems to be the increase you are getting across the caps so maybe the excess current is passing thru the rectifier bridge.

I vote for those, too. Just jumper it if needed. Here’s a similar 1. The other chip, the LM requires a power supply voltage of: That will give you a range of DC to expect at red. I should really add a switch to set the ground point.

Ahh yes diodes, i will desolder and check.