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Corrosion can usually be found at the PIN of the components and the copper track on the
PCB. If obvious corrosion signs are found, we recommend replacing the PCB to avoid
potential failure.
b) Internal Wiring /connector
Internal Wiring/connector should be checked; any wire/cable should be replace with a new
one.
c) DC CAP
DC CAP is a component that ages like a battery, especially in a high temperature
environments. So DC CAP should be inspected. A major sign of aged DC cap is deformation
on the surface of the cap or protective vent
d) Calibration
A Calibration should be carried out in an In-depth inspection.
5.3.1.3 PCB replacement
For updates or repair purposes, PCB replacement needs to be carried out. Hereafter is the
recommended procedure to replace a PCB.
1. Stop all power supplied to the UPS. Disassemble the top cover, left/right side cover of
the UPS.
2. Discharge the DC-charger.
3. Find out if the PCB needs to be replaced.
4. Unplug/unlock all the cable and the wires from the target PCB. We recommend not to
remove the wiring tie
5. Unscrew all the screws fastened the PCB.
6. Replace the PCB
7. Screw all the screws back into the PCB
8. Plug all the wiring back to place. There is label at the end of the wire/cable, make sure
the connector/terminal has same mark as the label
9. Replace wire cable if needed.
