HP Model 712/100 - Workstation Handbook page 120

7. Remove the power board.
Lift the front of the power board, then pull it toward the front of the unit until it
disengages from the grounding clip.
WARNING: Use only power supply Model ETYHP127MM with
the A2656A/C1530B/C2954A DDS Tape Drive.
8. Remove the bottom HP PAC.
9. Remove the SCSI ribbon cable.
From the back of the unit, use a small flat–blade screwdriver to remove the four
screws that hold the SCSI ribbon cable connectors in place.
5–44 Field Replaceable Units