Agilent Technologies 53147A Assembly Level Service Manual page 97

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CAUTION
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Chapter 3 Replacing Assemblies
Removing the Front Panel Assembly
Disengage the Power Meter output cable from the cable clamp on the
chassis floor near the right front corner of the chassis.
Disconnect the Power Meter input cable from J22, which is accessible
through the rectangular opening in the chassis floor near the right-front
corner of the chassis.
Disengage the Power Meter input cable from the cable clamp on the
chassis floor near the right front corner of the chassis.
Disconnect the Power Meter INPUT connector's ground wire (black) from
the ground lug on the chassis floor.
Disconnect the Channel 1 input cable from J15, which is accessible
through a hole in the chassis floor that is at the front of the chassis,
behind the Chan Select key.
Disconnect the DVM input connector from J23, which is accessible
through the square hole in the chassis floor approximately 1/3 of the way
back from the front panel in line with the Display DVM key.
Use a microwave torque wrench to partially loosen the nut that connects
the Channel 2 input connector to the sampler on the main circuit board.
Do not attempt to fully loosen the nut at this time. As soon as the nut
turns freely, stop turning it, and proceed to the next step.
Remove the two 6-32 x ¼ flathead machine screws from the countersunk
holes at the top-front corners of the chassis (see Figure 3-5).
Assembly Level Service Guide 3-9