⟐ Commented april 25, 2025 at 17:14 MST

⟐ Edited februari 13, 2014 at 16:00 MST

I unplugged the PC and I replaced the battery but I have not solved the problem.

Then I opened it to see if there are components that are burned or leak but nothing.

To be sure I replaced the cooling fan but nothing has changed.

Can anyone give me some tips?

Thank you very much.

⟐ Commented juli 26, 2025 at 8:04 MST

It has run for about 12-15 years without a hiccup or a problem.

Was away from the office with the UPS running the computer, Screen, Modem, Standard Speakers;

When I went back the computer was shut down as was the UPS system.

Powered on the UPS and it shut down seconds later with a fast beeping.

Checked out the power supply to the UPS unit and found it was working okay.

Disconnected all the out put lines from the UPS and turned the UPS unit back on, it run for a bout 2 seconds started a fast beeping then turned off.

I Have the user manual for this unit but can't find it at the moment.

Any ideas other than blowing taps over the unit and struggle to buy a new one.

I firmally believe in the saving power of a uPS bsystem.

⟐ Commented juni 10, 2023 at 0:09 MST

So it runs only from batteries. Not from the wall.

Thinking the circuit breaker may be burned or just malfunctioning, is this something I can just replace? I tried to search using common keywords with and without the brand with no luck.

Any tips will be welcome.

Thanks!

NOTE: All these tests performed WITHOUT any device plugged to the UPS!

And finally I'm attaching these hi res pics of MY OWN UPS main board just in case you spot anything I may be missing. To me everything looks OK and in good shape, AFAIK this ups was fully working before getting stored and the only issue was dead batteries but.... You tell me??

Well let's see, first things first, ive read over the Net that these prongs do pop-up a lot but I don't have any reference so I don't know if the below is a standard or an activated circuit breaker....

Wdy think?

Next thing I've done is check continuity in these 2 poles, and the multimeter beeped, so I guess it's OK and working, in the locked position "as it is" now?

Then I've checked for 220V (I'm in EU) on the upper right corner connectors and they do read 220V so I'm assuming the fuse is working and protecting the circuit so far (aka not "fused").

Am I right till here?

So, considering the AC reaches the main board past the circuit breaker, I'm at a loss now since I'm not an electronics pro to read the service circuits mapping...

Googling a bit further i found this article:

https://vasvir.wordpress.com/2021/02/15/...

Which for the Rs1000 mentions the change of 3 capacitors.

So my next question is:

Is there a safe way to test if these capacitors are in working order and if there is (multimeter?) how do I perform the check?

Excuse my ignorance once more!

(apparently this is the image of the Rs1000 main board if you feel you need to point me anything out :))

I'll thank any further input on troubleshooting this. Thanks!

Some more tests, each one gets me more confused!

WITHOUT the unit plugged to the wall, setting the multimeter to CONTINUITY, instead of BEEPs from the Multimeter, I get these values on its screen:

The one in the middle produces NO reading and NO beep on the multimeter :?

Then setting the multimeter to DC, I get the following:

THEN, PLUGIN the unit on the wall and turning on the UPS, I get this:

https://www.dropbox.com/s/fjnlawpi12hcqz...

Any insights?

So is it normal that plugged on the wall, with the unit turned OFF I'm getting voltage in the battery connectors? And if so, it means batteries do charge. And if so, what else is not acting so the AC does not kick in while there's wall power??

⟐ Edited maart 16, 2023 at 15:03 MST

Brand: Powercom Black Knight Pro

Model: BNT-650A / 650A

Board Model: BNT V3.0

Battery: CS3 GP 1272 F2 [12 volts 7.2Ah]

Battery is in good condition. Tested with another UPS.

Thanks in advance :)

[PS]

Diagram (Source: ElektroTanya):

(1) SCHEM1.pdf

(2) SCHEM2.pdf

Images (Source: Mine):

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10)

⟐ Commented maart 28, 2020 at 6:56 MST

⟐ Commented oktober 17, 2023 at 21:46 MST

I checked my UPS manual to see what does a continuous beep mean and the manual says it is due to a fault and doesn’t really describe anything else. I thought my PC would hit 600W or so at peak and be able to sustain with this UPS for a short period(1-2mins) every time there is an outage. But it doesn't seem to work. Also, I use this UPS only for my CPU and nothing else. All my other peripherals like monitors, speakers and rest are connected to an other UPS which works fine.

Specs:

Processor: AMD Ryzen 5 5600x(Air cooled)

Mother Board: B550M Gigabyte Aorus Pro AC

GPU: RTX 3070Ti

Ram: 2X 8GB 3200Mhz Ram

HDD’s: 1X 250GB m.2 NVme SSD, 1X 1TB 7200RPM SATA drive

PSU: Deepcool DQ750-M V2(750W)'

UPS: Zebronics: Zeb-U1225(1200VA/720W)

https://zebronics.com/collections/power-...

''I would like to know if i’m doing something wrong with the setup here. Is the UPS under spec for my PC? or is it really a faulty UPS? Is it not outputting enough power? Or is it something to do with the PSU? If so, what/how do I choose another UPS to support my PC?

I saw a couple of people using APC BR1500(1500VA/865W) UPS to support their gaming rigs. Does 1500VA/865W makes such a change compared to 1200VA/720W? Also, Zebronics UPS outputs a pure sine wave which APC doesn’t.

I’m clueless at this point. Please educate me! I’m worried about busting my new PC due to this. :(

⟐ Commented september 08, 2022 at 7:20 MST

⟐ Answered mei 13, 2024 at 13:24 MST

When I wanted to use it, I realized the internal lead acid is already flat, and I cannot charge it up with a lead-acid charger.

I bought a new lead acid battery to replace the internal one. It worked fine for a few days. After that I cannot get it to power on anymore.

I've tried the circuit breaker switch on the side and that does not help.

⟐ Answer deleted oktober 03, 2019 at 4:49 MST

⟐ Commented september 23, 2025 at 9:36 MST

⟐ Answer edited september 10, 2024 at 8:03 MST

⟐ Commented januari 14, 2023 at 10:00 MST

Replacement is difficult as the exact model of the transformer seems hard to find, due to age. Replacements I do find also seem fairly expensive.

I’ve heard of transformers with inline fuses, and I’m hoping I can repair this one.

Does anyone have any recommendations on where to start checking if there’s an easy fix or better yet, if there’s a drop in equivalent replacement?

⟐ Answered december 13, 2025 at 21:08 MST

I bought on eBay an used Liebert GXT3 2000VA UPS for my desktop computer. When power goes off (pretty common where I live) the UPS takes over and its alarm immediately starts beeping, something like once every 3 seconds, what for some people/company may be useful, but it is pretty annoying for me.
I am not electronic savvy but I have discover that the electronic component responsible for the alarm sound is a thing called piezoelectric component. Most of these things are like a small cylinder with a hole in the center, but when opening the UPS I could not locate such a thing.
I have 2 questions:

1. Could anyone point me exactly where it is located ?
2. How to properly disable it for good ?

Thanks for any help.

⟐ Answer accepted juni 19, 2024 at 7:22 MST

⟐ Answer edited november 11, 2023 at 13:36 MST

⟐ Commented maart 22, 2026 at 4:43 MST

The batteries take a very long time to get to 100% but when I remove the plug from the outlet to test the UPS then it can only supply power for a maximum of 5mins .

If I’m not mistaken, the batteries voltage is 24v and their capacity should be 3.5Ah since they are in serie, which means 84Wh and I’m consuming 110W (assuming the load as DC current), so it should last at least 45mins.

I didn’t find any approximations in the internet to have an idea on how much time a UPS should take so I hope I don’t have bad batteries, but if so then the fault alarm must be triggered, like when I test it the first time with the dead batteries.

⟐ Commented februari 25, 2026 at 14:07 MST

⟐ Answered januari 18, 2026 at 1:10 MST

How can I check it to see if it really isn't working?

UPS Model: PowerWalker VI 1000 PSW Schuko

I have this:

How do I add port to Firewall exclusions in Windows 11?

In order to start, the following screen must appear:

How can I start it automatically?

I solved the problem.

⟐ Edited by author september 11, 2024 at 14:13 MST