Re: Antec AR300 psu, loud squeal, no power
I finally got the PS powered on and measured ZD3, it did measure 10V. So my earlier post was incorrect in this regard.
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Last Activity: 02-03-2024, 07:40 AM
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Re: Antec AR300 psu, loud squeal, no power
Mo, Some thoughts on your schematic. R34 is R34; 4.99K. C19 measures 100nF. The unmarked diode is a Schottky SB540, D10. L2 measures 5.1uH. To me it looks like ZD3 does not connect to ground but to where R25/EC3 connect to the transformer. It measures 2.9V (not sure of this yet).
JonLeave a comment:
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Re: Antec AR300 psu, loud squeal, no power
Mo, great schematic and accompanying notes. And just from the pictures. JonLeave a comment:
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Re: Antec AR300 psu, loud squeal, no power
Mo, here is the way I read the components requested:
R22 red, black, green...gold: 2M 5%
R23 green, blue, orange...gold: 56K 5%
D7 LT 5323/UF1007
C16 TL/222M/1KV: 2.2nF
Q5 KN/2222A/438
Q6 UTC/2SA684/RJ0A
R28 violet, green, silver...gold: 0.75 5%
C17 J525/222/XCK: 2.2nF
TO-222 FB F02/FQPF/5N60C
if these don't make sense or you want something else, please let me know, JonLeave a comment:
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Re: Antec AR300 psu, loud squeal, no power
hi,
I have attached my shot (hold the laughter please) at a schematic fragment and my spreadsheet of relevant parts. (The transistors attached to the heatsink are hard to see; I'll work on it and the other parts for identification.)
thanks, Jon...Leave a comment:
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Re: Antec AR300 psu, loud squeal, no power
It appears that ZD3 is trashed. However, I have no idea what it's value is either. Maybe this is a hopeless idea to make it whole again?Leave a comment:
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Re: Antec AR300 psu, loud squeal, no power
hi,
Took a couple of photos. Not sure what you were looking for so ask away.
The two missing diodes are: D9 FR103, D8 1N4004. Some other components have not been replaced yet. Most of the ECnn have been replaced.
Jon...Leave a comment:
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Re: Antec AR300 psu, loud squeal, no power
Hi momaka, thanks for all of the help/information. I would like to answer your questions with some confidence; so I am looking at the pcb and trying to see exactly how c18 fits into the picture. I will get back when that work is done. JonLeave a comment:
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Re: Antec AR300 psu, loud squeal, no power
Here we are a few years later and AR300 power supplies still need help. I am rebuilding one and need help in identifying the value of SMD capacitor C18. The cap is open and since they are "unmarked", well I am stuck. I am hoping someone still has a working supply that they can measure C18's value. I know it is somewhat of a big ask; and I wouldn't if I could find another way to get the value. JonLeave a comment:
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