LAWO mc256 MKII, Technical Manual

Page: 266 / 372

mc²56 MKII Technical Manual V5.10.2/1 266
Chapter 4: Service/Maintenance
DALLIS Unit(s)
Replacing a Power Supply Unit
Each of the PSUs are individually hot pluggable.
To operate the DALLIS, one PSU is sufficient. Therefore, when two supplies are fitted, you can replace a PSU
without affecting the operation.
Warning
If only one PSU is fitted, then powering off will cause an interruption in audio from the DALLIS unit!
The replacement PSU must be of the same type; you cannot mix PSU types.
1. On the rear of the DALLIS frame, disconnect the mains from either the PSU 1 or PSU 2 IEC mains
connector as appropriate.
2. Unfasten the two screws on the right hand side of the hinged PSU cage door (marked by the arrows
below).
3. And pull the door open to access the PSU docking bays:
Unfasten these screws: Pull door open to reveal PSUs:
4. Unfasten the metal catch which holds the PSUs in place by pushing on the catch as shown:
5. Remove the relevant power supply unit and replace with the spare.
6. Fasten the catch back into place.
7. Replace the cage door and fasten the two screws.
8. Re-apply the mains to the PSU IEC mains connector and switch on!