Agilent Technologies 53150A Service Manual page 78

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Chapter 3 Replacing Assemblies
Removing the Rear Panel Assembly
The screw in the lower-left corner of the rear panel assembly (as viewed
from the rear of the Counter) may be covered by the serial-number sticker.
If it is, carefully cut away the lower-left corner of the sticker to expose the
screw head.
Disconnect the seven-wire cable that runs between the connector at the
back end of the power supply (TB2) and connector PMAIN1 on the main
board to provide better access to the cables that are attached to the back
panel assembly.
Disconnect the GPIB ribbon cable from connector JP3 on the main board,
and disengage the ribbon cable from the ribbon-cable clamps that are
attached to the power supply and the inside of the left wall of the chassis.
Position this cable so that it cannot catch on any other cables or other
components of the Counter.
Disconnect the external-reference input/output cable (coaxial) from
connector J8 on the main board. J8 is directly under the back edge of the
power supply near the chassis wall.
A two-wire AC-input cable (brown and blue wires) runs between the Main
~ Power switch on the rear-panel assembly and the connector that is
accessible through the cutout in the right-front corner of the power supply
enclosure (TB1). Disconnect this cable from the power supply.
When reinstalling the Rear Panel Assembly, be sure to route the two-wire
AC-input cable (brown and blue wires) underneath the power supply.
If the Battery Option is installed, there is a two-wire cable (brown and
white wires) that runs between the Main ~ Power switch on the rear panel
assembly and connector J3 on the Battery Option circuit board (J3 is the
third connector from the back edge of the board). Disconnect this cable
from J3 on the Battery Option circuit board.
Assembly Level Service Guide 3-13