Repairing YM-3591AAR power supply (HP P/N 81-00000051)

[Serdg]

Thank you! There are easier ways to adjust the voltage. Your feedback option is very complicated. He has no right to life. This global transformation leads to collapse. There are a lot of interesting information on these resources.

https://forum.bits.media/index.php?/topic/10447-%D1%80%D0%B0%D1%81%D0%BF%D0%B8%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0-%D0%B8-%D0%BF%D1%80%D0%BE%D1%87%D0%B8%D0%B5-%D1%82%D0%BE%D0%BD%D0%BA%D0%BE%D1%81%D1%82%D0%B8-%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B8-%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80%D0%BD%D1%8B%D1%85-%D0%B1%D0%BF/

https://www.rcgroups.com/forums/showthread.php?1005309-A-simple-high-quality-12Volt-100Amp-Power-Supply-Part1/page160

https://forum.bits.media/index.php?/topic/10447-%D1%80%D0%B0%D1%81%D0%BF%D0%B8%D0%BD%D0%BE%D0%B2%D0%BA%D0%B0-%D0%B8-%D0%BF%D1%80%D0%BE%D1%87%D0%B8%D0%B5-%D1%82%D0%BE%D0%BD%D0%BA%D0%BE%D1%81%D1%82%D0%B8-%D0%BD%D0%B0%D1%81%D1%82%D1%80%D0%BE%D0%B9%D0%BA%D0%B8-%D1%81%D0%B5%D1%80%D0%B2%D0%B5%D1%80%D0%BD%D1%8B%D1%85-%D0%B1%D0%BF/

[Andtec1]

Hi,

I have the same problem, when connecting the power cord the orange LED lights up but the server does not turn on. Both resistors are OK, R441 and R453 and also the F401 fuse. There are some flaws in the spreadsheet for the R278 and R535, but I can't find these two, you know their location?

Thanks.

[Zdomici]

No, I don't. But they're probably hidden under the white putty somewhere, the manufacturer's documents point to it as the main cause of the cracking resitors. You will have to carefully remove it and search for them. Please post photos if you find them.

[Alexij]

Hi, folks!

Here are pictures. R535 (1k) is on CPU daughtercard between two electrolitic caps. R278 (3k3) is on the main board below the right optocoupler. Unfortunately in my case both appeared to be OK. If you have some new ideas do not hesitate to post them . My PS is cleaned fron "white putty"

[Alexij]

[Andtec1]

Hi Alexij,

Thanks for the info, these two resistors are also OK, I will look for the other components

[Serdg]

I have not looked here for a long time. I replaced the resistor R149 with 3.65 k. Now, by adjusting the tuning resistor VR101 - I got 14.04 volts at the output of the power supply. Protection circuits and error compensation work within the factory settings. But I need 15-16 volts at the output. I am looking for a solution, but have not yet found it. Here are some circuit diagrams. Surely there are a lot of mistakes. But this gives at least some idea (global) of the regulation and feedbacks. My goal was to increase the tension. Therefore, I paid little attention to drawing nodes that I did not need.

[Serdg]

I need a power supply for the charger of car batteries. So I use another, quiet fan. To do this, I had to trick two fans of the power supply. I made a generator on a 74HC14D chip. Two generators in one chip case. Each generator for each fan. The pulse frequency corresponds to the average frequency of the tacho pulses of the native fans. (a typical scheme, I lost or wrote down on paper at that moment). Now I can turn on the fan only when a certain temperature is reached. I made a thermal switch circuit for another fan. It has no PWM adjustment. I would be grateful if someone would continue my work to increase the output voltage.

[Serdg]

Here are some of the documentation.

[Serdg]

More data. There are many mistakes, but for me it does not matter. I am making a block diagram. My goal is to understand and increase the output voltage. Maybe someone will continue my work. I will experiment. If there is a positive result, then I will draw a sequence. And let the virus bypass us all!