How to remove and replace the IO PCB
The ESM consists of two printed circuit boards (PCBs), with the Top PCB designated as the Input/Output (IO) PCB.
Before you begin, it is crucial to ensure that the ESM is completely powered down and disconnected from any electrical source.
Ensure that the main power supply is isolated before proceeding with the task.
Step 1: Carefully unscrew the screws and remove the front cover.
Step 2. Carefully remove the RS 485 inputs, scrubber status 4-20mA inputs, analog 4-20mA connections, and relay outputs.
It is important to take antistatic precautions when handling electronic components and PCBs to prevent damage.
Step 3: Carefully unscrew all screws securing the Top PCB, and then gently lift it to detach it from its position.
Refit the new PCB in reverse order to removal of the old PCB, install back all the connectors.
The ESM can now be energized and tested to ensure the original problem has been resolved.