HP Pro 3420 Maintenance & Service Manual page 49

Figure 7-8 Converter board location
To remove the converter board:
1. Prepare the computer for disassembly (see
on page 33).
2. Remove the rear cover (see
3. Disconnect the two cables from the board (1).
NOTE: Be careful not to damage the cables when disconnecting them from the board. Do not
pull on the wires.
Preparing to Disassemble the Computer
Rear Cover on page 34).
Converter Board 41