Agilent Technologies 53150A Service Manual page 79

11
WARNING
12
13
CAUTION
Chapter 3 Replacing Assemblies
Removing the Rear Panel Assembly
Use a 5/16-inch spin tight to remove the self-locking hex nut that attaches
the rear panel assembly grounding wire (green/yellow) to the right wall of
the chassis. Slide the grounding lug off the welded stud on the chassis
wall, and thread the lock nut back onto the stud a few turns until it is
finger-tight.
AN ELECTRICAL SHOCK HAZARD EXISTS IF THE COUNTER IS
OPERATED WITH THE REAR PANEL ASSEMBLY GROUNDING WIRE
NOT PROPERLY CONNECTED TO THE CHASSIS. TO PREVENT SERIOUS
INJURY AND/OR DAMAGE TO THE EQUIPMENT, NEVER OPERATE THE
COUNTER UNLESS THIS GROUND WIRE IS SECURELY CONNECTED TO
THE CHASSIS WALL AND THE REAR PANEL ASSEMBLY.
Extract the ends of all of the cables that you disconnected in Steps 7
through 9 from under the power supply, so that they are completely
exposed and cannot catch on other cables and components when you
remove the rear panel assembly.
Carefully pull the rear panel assembly away from the back end of the
chassis. Guide the cables that remain attached to the rear panel assembly
as you remove it to prevent them from catching on other cables or other
components of the Counter.
When reinstalling the Rear Panel Assembly, position it carefully to avoid
damage to the power LED, the serial-port connector (RJ-12), and the main
board. If these components are not correctly aligned with the openings in
the back panel, they may be damaged.
3-14 Assembly Level Service Guide