Valleylab Force FX-8C, Service Manual

Page: 181 / 218

Power Supply/RF Board Replacement
Replacement Procedures
Force FX-8C Service Manual 7-27
Power Supply/RF Board Replacement
Equipment required:
• Phillips screwdriver.
Step 1 – Remove the Power Supply/RF Board Assembly
A. Turn off the generator. Disconnect the power cord from the wall
receptacle.
B. Remove the five screws that secure the cover to the chassis. Lift the
cover off the chassis. Set the cover and screws aside for reinstallation.
C. Disconnect and remove the front panel assembly.
(1) Unlock the connector on the Control board and disconnect the
display board ribbon cable from the Control board.
(2) Disconnect the power switch cable from the Power Supply/
RF board.
(3) Disconnect the two REM connectors from the Power Supply/
RF board.
(4) Remove the four screws that secure the front panel to the chassis.
Save the screws for reinstallation.
(5) Slide the front panel assembly forward, carefully disengaging it
from the electrical contacts on the Power Supply/RF board.
D. Disconnect the Footswitch Board ribbon cable from the Power Supply/
RF board.
E. Disconnect the power entry module from the Power Supply/RF board.
F. Remove the four screws that secure the rail to the chassis. Also remove
the screw in the center of the Power Supply/RF board (behind the
Control board). Save the screws for reinstallation.
G. Remove the assembly (Power Supply/RF board, heat sinks, Control
board, low voltage power supply, fan) from the chassis.
Warning
Electric Shock Hazard
To allow stored energy to dissipate after power is
disconnected, wait at least five minutes before replacing parts.
Caution
The generator contains electrostatic-sensitive components. When repairing the
generator, work at a static-control workstation. Wear a grounding strap when
handling electrostatic-sensitive components, except when working on an energized
generator. Handle circuit boards by their nonconductive edges. Use an antistatic
container for transport of electrostatic-sensitive components and circuit boards.
Notice
Calibrate the generator after you install a new Power Supply/RF board.
Component differences may affect output waveforms.