To Remove The Attenuator - HP 54616B User And Service Manual

Service
Replacing Parts in the Oscilloscope

To remove the attenuator

Use the following procedure to remove the attenuator assembly. When
necessary, refer to other removal procedures.
ELECTROSTATIC DISCHARGE!
C A U T I O N
Use grounded wrist straps and mats when servicing the system board.
Electrostatic discharge can damage electronic components.
The attenuator is not part of the system board. If the system board is
replaced, the attenuator will have to be moved to the replacement board.
Remove the system board.
1
Remove eight screws from the bottom of the system board that
2
secure the attenuator.
Three 24-pin connectors (located at the rear of and inside the
3
attenuator) connect the attenuator to the system board. With a
gentle rocking or prying motion, lift the attenuator from the system
board.
4-50
If you permanently replace parts
If you have permanently changed any combination of system board, attenuator,
or acquisition hybrid, you will need to adjust the high-frequency pulse response
on the affected channels. For example:
• If you permanently swap the acquisition hybrids during troubleshooting, you
must adjust both channels.
• If you replace one hybrid, you must adjust that channel.
• If you replace the system board, you must adjust both channels.
• If you replace the attenuator, you must adjust both channels.