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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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Its the original Full AT style like in the It doesn’t try to restart. I’m using a DMM so I’m not entirely sure if the power transistors are switching to pulse through the transformer. In fact I think this is the problem. From the source above I have narrowed it down to the control section. I have been looking for a startup resistor but I don’t seem to be able to find one.

I’m looking for a large one with the third band as blue or green, in the Mohm range. There are 2 ceramic power resistors. The other, 3W 51[ohm symbol]K, has one leg connected to one side of the main transformer T5, and via a ceramic capacitor to a tiny transformer T4.

Its been a while since I read the values on a power resistor, is the placement of the ohm symbol supposed to indicate the multiplier? The secondary from T4 goes back into the control circuitry, as does the secondary from T1.

Each of T2 and T3 is connected to a power transistor, and the other side of T2 and T3 lead back to the control circuitry. Sorry they are a bit grainy.

SHARP IR3M02 datasheet, IR3M02 is SMPS controller

Any help appreciated Oh and BTW, yes, i know how to discharge caps: What are you using for a load? On PSUs this old, it’s not unusual for electrolytic capacitors to dry out–i. One suspect is the cap labeled C4 the blue one datasyeet I’m guessing right, it’s usually a non-polar dstasheet and ripple current can run very high and heat it.

I would think in an overcurrent condition you would be able to hear a ticking sound. The fact that the fan spins temporarily then stops indicates the power supply is starting up then shutting down due to a fault. The power supply will not try ie3m02 start again until the main caps have discharged so needs to be off then caps discharge to reset. Weak caps can cause an undervoltage shutdown condition. Without a schematic, it will be hard to figure out which caps are bad but I would suspect the ones on the 5V supply used for a sample voltage.

I’m guessing the Vcc on pin 12 provides a 5V reference on 14 which is compared to the sample. A schematic and a scope would be needed to narrow it down further. Thanks Chuck Gnow for a question you may have guessed coming: The capacitor is labeled: Why do manufactures have to be so cryptic sometimes: 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.


I vote for those, too. Sometimes they pop out underneath with no evidence from above. A simple ohmmeter test between the common rail and each output should determine if there are any shorted filter caps.

The forum you pointed to obviously haven’t had much experience with caps. You’ve got a 2.

Datasheet «IR3M02»

If you’ve got a DMM with a capacitance scale, lift one of the legs from the board and verify the value. Here’s a similar 1. I don’t think any caps are shorted, just open. A power supply driving a direct short would immediately go into shutdown tick mode without giving enough power for the fan to start.

Open caps will not provide enough power to maintain operation other than a second or so but would torque the fan. I have ordered a 2. I had a look through my parts bin, to find a 2.

Is that across the AC mains? It’s just for RF suppression. Retraction – looking further at it’s location it looks more like a tuning cap by the transformer.

I still advise being accurate on it’s value. A wrong value could toast the output transistor. I would still advise trying the if3m02 Paul mentioned 1st. The image I datasheef to is verified as a 1. That it’s part of a tank circuit is the reason for the non-polar. You’d toast a polar cap in minutes. There’s a guy in Kazakhstan who has a huge capacitor collection, whence this image came from.

Here are his 1. The whole site, http: Yup some manufactures put the value on the cap as is, 2.

Hi, well i replaced the non-polar cap with a new one, and replaced the 5 electrolytic caps on the output side, but its still not working. I checked the electrolytic caps with my multimeter on the high ohms range and they started out low and went up. Not exhaustive but the best i can do. I now get a much bigger kick of the fan, but the 3. I daasheet about 7V on the 12V and 3V on the 5V for a second and then it dies.

One thing i did notice is that the main filter caps that have VDC across each of them are rated as V uF? I have checked the voltages switch and it’s set correctly.

As far as I can tell, it doesn’t affect this part, I will have to check more closely. Line operated switch-mode power supplies operate in two stages. The first involves changing the line AC to to DC, so there’s typically a bridge rectifier irr3m02 a smoothing capacitor s. The DC is then converted to high-frequency AC usually between 25 and 40 KHz and fed into a transformer high-frequency transformers don’t need nearly as much iron as line-frequency ones do.

IR3M02 PDF Datasheet ( 特性, スペック, ピン接続図 )

The outputs are taken from windings on the transformer, rectified and filtered. Usually, one output is selected as the reference value for oscillator control. Because the stuff coming off of datashest transformer is high-frequency, you don’t need nearly as large a smoothing capacitor than you would if you were dealing with line frequencies.


So other than dodgy caps, what can go wrong? They do have a failure rate in which they’ll tend to fail shorted. LM on their outputs. If one of those fails, it’s usually as a short.

Some PSUs have a protective “crowbar” overvoltage circuit, but it’s been a long time since I’ve seen one of those fail. Don’t leave powered on in the overvoltage condition!! The caps will explode. Something is wrong with your voltage switching. The faq you referenced should have the jumper J1 removed for VAC operation.

Your dahasheet supply is shutting down due to an overvoltage condition. Looking at your photo, I’m guessing the back connector datasgeet the fuse is your AC input and the connector by the transformer is a voltage switch aka J1?

I will adtasheet to do the photo tomorrow. Yes the equivalent of j1 is removed, but i am still getting VDC? Its a familiar ir3m2 to me to do with 3-phase, so I will have dagasheet look here a bit more closely, perhaps the rectifier is screwy. I replaced some caps around there too. The datasheet i found for it is dreadful quality. I will inspect it further. That’s way too much.

Usually, on a supply of this vintage, there’s a voltage selector switch mounted on the power supply case that selects between and v. If you’re running it on the V setting, the rectifier circuit is placed into a voltage-doubler configuration and output should datasheeg no higher than about V 1. When you’re in volt line mode, the rectifiers and capacitors are typically arranged in a full-wave bridge, which should yield about the same no load V.

Here’s a typical example http: See how the input circuit shown matches with your PSU.

I tried to scan it to avoid perspective, but the capacitors are too high, which makes the PCB very dark. The voltage selector switch is set as open. If you need a better photo let me know and i will re do it. Just a thought have ir3m002 checked the bleeder resistors, They can go open, Not only can they serve as a safety device they can also establish a predetermined level, VDC is definitely not right, Ratasheet VDC or VDC per Cap as Chuck and Retrogear have said is about right, Might vary irm02 bit as it depends on what you got coming out of your wall socket.

Is it my eyes or do those main caps look bulged? Your AC should be plugged into the other connector where the fuse is.

Look at the sample Chuck provided. Irm302 goes to points L and N!!! The main caps are not bulged, yet V an allits just the light.