Muramar The outputs are taken from windings on the transformer, rectified and filtered. Or have i got this all wrong? I removed J1 that links T1 to the center point of the two main filter caps. From what i understand it is not needed usually. This makes me think i have been in completely the wrong area.
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I checked the electrolytic caps with my multimeter on the high ohms range and they started out low and went up. In V mode it is open. In fact I lr3m02 this is the problem. That will give you a range of DC to expect at red. I get about 7V on the 12V and 3V on the 5V for a second datasheef then it dies.
Then check the comparator ICs, each probably contains two or more comparators, each has two inputs and one output. Open caps will not provide enough power to maintain operation other than a second or so but would torque the fan. Sometimes they pop out underneath with no evidence from above. One time a coworker and I were doing overtime work in the evening.
Your power supply is shutting down due to an overvoltage condition. The faq you referenced should have the jumper J1 removed for VAC operation. I think your voltage doubler circuit dtasheet unbalanced due to an open main cap or maybe an open thermistor? I vote for those, too. Does anyone have an idea of how to do this? The secondary from T4 goes back into the control circuitry, as does the secondary from T1. I would still advise trying the caps Paul mentioned 1st.
Or have i got datasheey all wrong? In my previous post I was trying to explain an unbalanced doubler. Dataaheet 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 am going to replace them though. Yes the equivalent of j1 is removed, but i am still getting VDC? Thats a bit close to the 25V rating of C Just a thought have you checked the bleeder resistors, They can go open, Not only can they serve as a safety device they can also establish a dayasheet level, VDC is definitely not right, Around VDC or VDC per Cap as Chuck and Retrogear have said is about right, Might vary a bit as it depends on what you got coming out of your wall socket.
A project a long time ago. A simple ohmmeter test between the common rail and each output should determine if there are any shorted filter caps. The whole site, http: I had a look through my parts bin, to find a 2. The datasheet i found for it is jr3m02 quality. What is the voltage rating of C11?
Power up and see if primary datashee T1 datzsheet now V AC. Good Idea I am going to try to get an early nights sleep to night. Related Posts
IR3M02 DATASHEET PDF
Good Idea I am going to try to get an early nights sleep to night. Something is wrong with your voltage switching. AC across the yellow? What is the voltage rating of C11? I removed J1 that links T1 to the center point of the two main filter caps. The fact that the fan spins temporarily then stops vatasheet the power supply is starting up then shutting down due to a fault.
I checked the electrolytic caps with my multimeter on the high ohms range and they started out low and went up. In V mode it is open. In fact I lr3m02 this is the problem. That will give you a range of DC to expect at red.