If you cannot find the direct Homage PDF, search for (generic). Many brands share identical designs. Look for boards marked "PCBA-1000VA-REV3" – that PCB is used across multiple brands.
A 1000VA UPS typically operates as an "offline" or "line-interactive" system. Key sections of the circuit include: Rectifier/Charger Stage
Without the diagram, a technician is essentially working in the dark. The Homage 1000VA is not a simple linear circuit; it is a sophisticated switching power supply. The PDF format is the industry standard for these documents because it allows for high-resolution zooming to trace individual tracks on the Printed Circuit Board (PCB) without losing clarity, which is vital when identifying SMD (Surface Mount Device) components.
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Here's a simple circuit diagram (not specific to Homage):