How to remove and replace the ESM Processor PCB
Prior to starting work, if the processor PCB can be energised, you must download the setting for both safe keeping and for reloading into the new processor PCB once replaced.
Instructions on performing this task can be found here.
The ESM consists of two printed circuit boards (PCBs), with the larger board positioned at the bottom designated as the Processor 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 disconnected 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: Unscrew all screws surrounding the Top PCB and gently lift it off to remove it.
Step 4: Carefully detach all studs surrounding the PCB and lift the PCB Clear.
Refit the new PCB in reverse order to removal of the old PCB, install back all the connectors.
Step 5: Load the settings following the procedure found here.
The ESM can now be energized and tested to ensure the original problem has been resolved.