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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Scopes are definitely handy, Years ago i picked up a scope and scope calibrator that was in a job lot i bought, I played with dtasheet scope a couple of times and it got put away and hasn’t seen the light of day since, I must dig em out one day though i suspect after all this time they have died in their sleep, I’ve also got a Fluke that cost me an arm and a leg and a couple of other DMM’s and analogue meter which i mainly use.

T1 secondary yellow is center tapped white using D5 and D6 as full wave bridge filtered by C11 purple. datashheet

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I’m guessing the Vcc on pin 12 provides a 5V reference on 14 which is compared to the sample. Its probably just old. So if that’s the case getting 7V at either VCC is wrong. What are you using for a load? T1 could be bad but I doubt it because I think you would see some smoke: A simple ohmmeter test between the common rail and each output should determine if there are any shorted filter caps.


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.

However when I first connect the probes it did jump to about 30V then went to 0V. I’m using a DMM so I’m not entirely sure datashet the power transistors are switching to pulse through the transformer.

A schematic and a scope would be needed to narrow it down further.

I think your voltage doubler circuit is unbalanced due to an open main cap or maybe an open thermistor? Connect DC supply via a current limiting resistor eg ohms to SMPS IC – check voltage on each IC to determine that supply is within range, increase DC voltage until all ICs are powered up, check voltage drop across current limiting resistor for current drain.

I cant datashete the LM is too fussy about 18V exactly, because if it did this power supply design as far as i can tell would require a VAC source in V mode.

IR3M02 Datasheet

The main caps are not bulged, yet V an allits just the light. The caps will explode. We took a break and went out to a bar for a couple of beers, then the solution came to me and I went back to the shop and fixed it.

Are the bleed resistors those tiny little ones either side of the main filter caps? That’s way too much. Yea, without a schematic I’m clueless at this point. The outputs are taken from windings on the transformer, rectified and filtered. Open caps will not provide enough power to maintain operation other than a second or so but would torque the fan.


Solder J1 then unsolder one end of D5 and D6. I could not get an AC reading across either cap. If one of those fails, it’s usually as a short. It was hard soldering when I was tipsy but I never told my boss The problem is what voltage? Yes my diagram is wrong, the circuit datasneet correct however.

I would still advise trying the caps Paul mentioned 1st. I will try to do a circuit diagram tomorrow of this part of the circuitand point them out. When you measured did you have the switch connected to the board, Do you still get a constant Ohms reading when measuring across the 2 pins on the board with switch not connected, PSU not plugged in and caps drained. I’m wondering if the PSU datashet if you apply V to it That will give you a range of DC to expect at red. Is it ir302 eyes or do those main caps look bulged?