Malfunctioning PSU

JoeBob · 21st August 2003, 02:08 AM

I get a -33V and +1.8V, so obviously the PSU isn't working correctly. Now I know it's probably either the diodes of the cap, but which is more likely? I ask instead of changing one and trying because it's quite packed in it's place and chaning either is a pain, big pain. I'm just trying to change the most likely first, thanks for any help...

Nuuk · 21st August 2003, 07:45 AM

JoeBob, check the voltage (AC) into your rectifier bridge and also coming out of it (DC).

Then check each rail at every stage from the rectifier bridge to the pins of the chip.

JoeBob · 21st August 2003, 02:34 PM

The transformer is fine, and I just replaced the diodes and the same problem is there, could the caps be the cause of this problem? I don't see how it could only have 1.8V for the + voltage...

Nuuk · 21st August 2003, 03:24 PM

It may help us to help you if you posted what results you have at each stage of the PSU.

JoeBob · 22nd August 2003, 05:42 AM

You see, that's what's weird, everywhere I get 1.8V,.

Greg Erskine · 22nd August 2003, 06:23 AM

Hey JoeBob.

We need a little more information. Can you describe what you have done!

My first guess is you have connected up the secondaries incorrectly.

21st August 2003, 02:08 AM	#1
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	Malfunctioning PSU I get a -33V and +1.8V, so obviously the PSU isn't working correctly. Now I know it's probably either the diodes of the cap, but which is more likely? I ask instead of changing one and trying because it's quite packed in it's place and chaning either is a pain, big pain. I'm just trying to change the most likely first, thanks for any help...

21st August 2003, 07:45 AM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	JoeBob, check the voltage (AC) into your rectifier bridge and also coming out of it (DC). Then check each rail at every stage from the rectifier bridge to the pins of the chip. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

21st August 2003, 03:24 PM	#4
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	It may help us to help you if you posted what results you have at each stage of the PSU. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

22nd August 2003, 06:23 AM	#6
Greg Erskine diyAudio Member Join Date: Jan 2002 Location: Sydney/Australia	Hey JoeBob. We need a little more information. Can you describe what you have done! My first guess is you have connected up the secondaries incorrectly. __________________ Greg Erskine

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21st August 2003, 02:34 PM	#3
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	The transformer is fine, and I just replaced the diodes and the same problem is there, could the caps be the cause of this problem? I don't see how it could only have 1.8V for the + voltage...

22nd August 2003, 05:42 AM	#5
JoeBob diyAudio Member Join Date: Nov 2001 Location: Montreal, Canada	You see, that's what's weird, everywhere I get 1.8V,.

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