Posted: 2/9/2026 1:11:01 PM EDT
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Wherein we don't talk about the Brown Clown delivery service, but rather power conditioning and protection equipment for computer gear. I'll start: How many readers are familiar with the various iterations of APC SmartUPS 1400? I'm in the middle of repairing one of mine (which has a damaged main board). So far I've identified at least two: One, a standard SU1400NET model (Rev10 PCB) and an Extended Run Time version which can accommodate an external battery pack in addition to the internal pack. The board from one of those is listed as Rev16. Kinda hoping to switch mine over to an Extended Run Time version. Found a back plate with the connector cut-out and a PCB with the required wiring. It's listed as a 640-0732P and I wonder where else it may have been used. |
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The plot REALLY thickens here. I now have three 640-0732P main boards in hand. All three are different. The first was the original board in the UPS. I've had the unit since new so I know it hasn't been changed at some point. This one had a cable with 2 pin battery connector (for an RBC7 pack), the Fan power connector is populated. The inverter section has 4 MOSFETs per heat sink and two smoothing capacitors installed. Board 2 was what I got as a replacement for Board 1, and the difference between them is that the Fan connector is absent and the battery wiring harness had a rear panel disconnect in series with the negative lead. The battery harness itself was one set up for an RBC6 pack. I swapped the one from Board 1 so I could use it with the RBC7 pack. Board 3 came in today. It has 3 MOSFETs per heat sink and only one smoothing capacitor. It's otherwise identical to Board 2. Note that all 3 boards are labeled 640-0732P - Rev16. There is space for 5 MOSFETs per heat sink on all of them. Here's my SWAG: This board was used as the base for Smart UPS models 1000, 1400, 1500 and 2200. The only difference between models would be the battery harness, inverter semiconductor complement, smoothing capacitor count and the microcontroller. I have another back panel coming in the mail. Plans are to configure the second board back to the disconnect style harness, mod the case for the disconnect, then swap the microcontroller for the one from Board 1 and test things out. Hopefully my experimentation will help someone else out. |
