HP 54616B User And Service Manual page 144

Service
Replacing Parts in the Oscilloscope
Loosely install the two hex standoffs and two screws through the top
3
plate.
Use 5 mm (3/16 in) and T6 torque drivers set to 0.34 Nm (3 in-lbs) to
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tighten the standoffs and screws in the following sequence.
Tighten any standoff or screw to specifications.
a
Tighten the standoff or screw directly opposite the first one to
b
specifications.
Tighten the remaining two standoffs or screws to specifications.
c
Check for the graphite pad on the underside of the heatsink, then
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install it with the hole that is near one corner toward the front of the
instrument.
When the heatsink is installed properly, you will be able to see the
adjustment potentiometer through the hole in the heatsink.
Install the heatsink spring with the curve down.
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Install the two heatsink screws . Use a T6 torque driver set to 0.23
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Nm (2 in-lbs) to tighten them.
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.
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