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All repairs should be performed by The UPS has its own internal energy source (battery). No modification of any circuit should be attempted. If external batteries are to be used, the battery circuit breakers. (or fuses) must be mounted as close as possible to the batteries, and the connecting cables UPS repairing datasheet, cross reference, circuit and application notes in pdf format. Jul 15, 2018 - #Homage #Ups #Power Supply repair tips with #UC3845 Pinout Detail + voltage detail of each pins of UC3845. Apply measuring instruments safely. 3. Operate the series & parallel circuit, capacitors, inductors etc. Handle Transformers & batteries.The following steps should be taken, in the order indicated:Band UPS. 1. Ensure that all packing is removed from the UPS. 2. Remove the cardboard outerwrap. The Test Step, this section tells you how to test the UPS after you repair the unit. Note: “XX” in the serial number is the version of the PCB.