HP 54520 Series Service Manual page 104

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To remove and replace the disk drive
Disconnect all of the various cables from the main assembly. For reassembly, note
which coaxial cable goes to which connector on the main assembly.
e Line sync (Connects the line sync transformer on the line filter cable to the PC board.)
e HP-IB
e RS-232
@ Coaxial cables
Separate the rear panel from the cabinet.
Replace the rear panel by reversing this procedure.
To remove and replace the disk drive
Use this procedure to remove and replace the disk drive. When necessary, refer to other
removal procedures.
Disconnect the power cable.
Remove the cover.
Remove two screws that secure the disk drive and bracket to the top of the power
supply.
Slide the disk drive back and out of the instrument.
Disconnect the ribbon cable at the disk drive.
Remove four screws that secure the bracket to the disk drive.
To reassemble the instrument, reverse the procedure.
To remove and replace the power supply
Use the following steps to remove the power supply assembly. When necessary, refer to other
removal procedures.
Disconnect the power cable.
Remove the cover.
Remove two screws that attach the disk drive and bracket to the top of the supply.
You can leave the disk drive attached by its cable.
At the power supply, disconnect the cable that connects the supply to the main
assembly.
The cable has two connectors at the supply.
Disconnect the line filter cable at the power supply.
Remove the two locking pins that secure the power supply at the right front and rear
corners of the cabinet. Pull the pins up and out.
Slide the supply out through the side of the cabinet.
To replace the supply, reverse this procedure.