Keysight Technologies 53147A Service Manual page 102

3 Replacing Assemblies - Disassembly and Reassembly
6 Disconnect the external-reference input/output cable (coaxial) from connector
7 A two-wire AC-input cable (brown and blue wires) runs between the AC input
8 If the Battery Option is installed, there is a two-wire cable (brown and white
9 Use a 5/16-inch nut driver to remove the self-locking hex nut that attaches the
10 Use a 7 mm nut driver to remove the two hex standoff screws that attach the
AN ELECTRICAL SHOCK HAZARD EXISTS IF THE COUNTER IS OPERATED
WARNING
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.
11 Carefully pull the rear panel assembly away from the back end of the chassis.
When reinstalling the rear panel assembly, position it carefully to avoid
CAUTION
damage to the Battery Charging LED, the serial-port connector (RJ-12), the
GPIB connector, and the main board. If these components are not correctly
aligned with the openings in the back panel, they may be damaged.
102
J8 on the main board. J8 is directly under the back edge of the power supply
near the chassis wall.
module on the rear-panel assembly and the connector that is accessible
through the cutout in the front of the power supply enclosure (TB1).
Disconnect this cable from the power supply.
wires) that runs between the AC input module 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.
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.
GPIB connector to the rear panel assembly.
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.
Keysight 53147A/148A/149A Assembly Level Service Guide