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Tips For Repairing UPS
A friend of mine who is also a technician brought me this UPS ( Model: Partner Digital PRD1050) that does not work. The guy said that he checked the battery and that it is working fine. He said there is something wrong with this device. I promised him to take a look and see what I can do with it.
It took him a while to bring it to the shop for repair because he was trying to find out if it was covered by the warranty. It seems like it was not covered because one week later, he showed up in my shop and asked me to take a look.
This sticker is found on the side of the UPS device that explains the specifications of it.
When I powered up the device, there was only an indication of the AC power connected but it did not give me any indication of DC volts except the battery indicator and that does not mean anything. Even when I disconnected the AC source, there was no indication either of any DC source on that panel.
Screws were off and I could see a clean board on the inside and as well the battery. Take a look.
Checked all of fuses on the board and it seem like all of them in their best working order. I looked for burnt marks, plugged capacitors or any indication of something wrong but there was nothing of such sorts.
The most common sense was to check the battery despite what the owner say about this device. The moment I took it out and checked the volt on that battery look what I found
It was suppose to give me at least 12 volts reading but it was giving only 3 volts. For more conformation, I usually pick up the battery and shake it close to my ear and most of the time I hear something shaking inside the battery which means it is a dry battery and need to be replaced.
What if the battery was not getting enough voltage to be charged? To make sure I did this test. While the UPS was power up, I checked the voltage reaching the two terminals. It was getting 14.21 as you can see in the phone.
That is a very important indication that the UPS is working fine and the battery is at fault.
Look what happened when I replaced the battery and unplugged the power source. I could see the display of the DC battery icon and I could hear the UPS peeping which is an indication of AC power lost yet supported by the power of the battery.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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