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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Thanks Chuck Gnow for a question you may have guessed coming: Then check the AC across each of the main filters individually.

IR3M02 View Datasheet(PDF) – Sharp Electronics

If i switch on the Auxiliary Power supply feeding the 18V in I get the kick of the fan. I had a look through my parts bin, to find a 2.

Yes – looking at your drawing again. 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 ir302 rectifier bridge. Otherwise I think datadheet will have a difficult job in reviving your power supply. Its infuriating me, but then it is my PSU: Here’s a typical example http: Your power supply is shutting down due to an overvoltage condition.

I have sketched out some of the PSU diagram and I am a bit confused: The wire coming out of that connector goes to the voltage selector switch.

It was hard soldering when I was tipsy but I never told my boss With AC i get maybe V. So i suppose putting 18VDC into the circuit after the diodeshould power it.

They do have a failure rate in which they’ll tend to fail shorted. Then check the ig3m02 ICs, each probably contains two or more comparators, datwsheet has two inputs and one output. Thanks all of you for your help so far. The voltage selector switch actually reads ohms when in V, not sure if that’s by design or 20 years or corrosion. I’m guessing the Vcc on pin 12 provides a 5V reference on 14 which is compared to the sample.


I could not get an AC reading across either cap.

IR3M02 Datasheet PDF

Datashet you need a better photo let me know and i will re do it. Annoyingly i sold a big box of transformers on ebay about a month ago vatasheet i though i would never use. Open caps will not ir302 enough power to maintain operation other than a second or so but would torque the fan. If i do the reverse, connect V supply first, nothing happens, If i then switch on the Auxiliary PSU i get a kick from the fan. As far as I can tell, it doesn’t affect this part, I will have to check more closely.

The datasheet i think assumes a level of knowledge that i just don’t have: Weak caps can cause an undervoltage shutdown condition. I’m not sure if this is the circuit or just the multimeter, its very cheap. What’s the history of this PSU, Has it worked since you’ve had it or did datashee get it non working, Bleeder resisters are in parallel with the cap, If fitted that is.

However its actually fine there. I have since de-soldered those two diodes from T1 and connected 18VDC directly into the start up circuitry. T1 secondary yellow is center tapped white using D5 and D6 as full wave bridge filtered by C11 purple.

Each datashheet T2 and T3 is connected to a power transistor, and the other side of T2 and T3 lead back to the control circuitry. I think i can just about see where your are going. The other, 3W 51[ohm symbol]K, has one datasheet connected to one side of the main transformer T5, and via a ceramic capacitor to a tiny transformer T4. I just enjoy doing this kind of troubleshooting.


Don’t leave powered on in the overvoltage condition!!

Something is wrong with your voltage switching. Yea, without a schematic I’m clueless at this point. A project a long time ago. Make sure everything you soldered on, etc is back in place, including the selector switch.

IR3M02 Datasheet(PDF) – Sharp Electrionic Components

The output section is all a bit confusing to me right now, all i know is that the two big chips with heat sinks are 2-diode rectifiers. If you’re running it on the V setting, the rectifier circuit is placed into a voltage-doubler configuration and output should be no higher than about V 1. This i hope will power the controller and hopefully get the thing going. I would first replace all smoothing caps on the 5V rail, most likely the four large ones at the upper right of the first pic.

Usually, one output is selected as the reference value for oscillator control. You have J2 in the right place. In the last photo you did, J1 is linked from the top blue circle, directly up to the next terminal. I’m out of ideas but thinking you may be right that the primary of T1 is shorted. The faq you referenced should have the jumper J1 removed for VAC operation.