I have recently acquired two Antec SmartPower psu, SP350 and SP400. The SP350 required a lot of repairs before recapping. The critical 5vsb capacitor esr was greater than 99 on Blue esr meter, so high +5vsb voltage and other component failures. The SP400 critical 5vsb capacitor had esr of .86, still measuring 5 volts. Both had lots and lots of Fuhjyyu capacitors. I have replaced nearly all with Nichicon PW caps, but had to order some of those small diameter ones from topcat.
What remains to be done: the SP350 has Fuhjyyu mains 680 uf/200 volts, and the SP400 has Fuhjyyu mains 820 uF/200 volts. Does Fuhjyyu main caps also give problems big enough to require replacement?
Both psu boards had one .1 uF/50 volt cap and one .22 uF/50 volt cap. Also Fuhjyyu. Nichicon does not make low esr capacitors for these small values. I need to look at what circuits they are in to determine if a ceramic or plastic capacitor could be used, or if a general purpose aluminum capacitor would be OK. Any suggestions?
And finally, each psu got a 5vsb modification - add on board with DM311 chip. Hate to invest time and money in a psu with a loser (2 transistor circuit) for 5vsb. Here are some photos showing the add on modification board.
What remains to be done: the SP350 has Fuhjyyu mains 680 uf/200 volts, and the SP400 has Fuhjyyu mains 820 uF/200 volts. Does Fuhjyyu main caps also give problems big enough to require replacement?
Both psu boards had one .1 uF/50 volt cap and one .22 uF/50 volt cap. Also Fuhjyyu. Nichicon does not make low esr capacitors for these small values. I need to look at what circuits they are in to determine if a ceramic or plastic capacitor could be used, or if a general purpose aluminum capacitor would be OK. Any suggestions?
And finally, each psu got a 5vsb modification - add on board with DM311 chip. Hate to invest time and money in a psu with a loser (2 transistor circuit) for 5vsb. Here are some photos showing the add on modification board.
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