Samsung DMT300 Series Training Manual page 22

Disassembly and Reassembly - 6. Panel Control part (2/2)
* PCB ass‟y disassembly
4) Disassemble the PCB ass‟y.(4 screws)
Separate all the terminals of PCB.
[Caution]
- When separating the terminal, always turn the
power off before working.
* PCB tact ass‟y disassembly
5) Disassemble the PCB tact ass‟y.(3 screws)
[Caution]
- When reassemble the PCB tact ass‟y, ensure
to place the seal button on original location.