homage ups drive card is used to drive the MOSFETs of the inverter section and a microcontroller controls the input of the h bridge and drive card. When any fault occurs in the inverter section of ups then we have to check the drive card also because if u repair the MOSFET section of the inverter and your drive card is still faulty then your ups output will be low voltage of around 140v or high voltage around 350v in this case you have to replace or repair the drive card circuit.

how to repair the homage ups drive card circuit?

pull out the drive card from the main PCB and check its pnp and npn transistors, 1k and 2k resistors, and 499ohm resistors the most common fault is in these components. Optocouplers are also part of the drive card. drive card is very costly nowadays in the market around 600 pkr so I suggest you repair the drive card that’s very easy. In this pdf file, you can read the complete circuit diagram of the drive card components.hopefully, you can repair your card with this circuit diagram.

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