Valleylab Force FX-8C, Service Manual

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Right Heat Sink and Component Replacement
7-20 Force FX-8C Service Manual
Right Heat Sink and Component Replacement
Equipment required:
• Phillips screwdriver.
Step 1 – Remove the Right Heat Sink
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. Remove the Control board.
(1) Unlock the connector on the Control board and disconnect the
display board ribbon cable from the Control board.
(2) Carefully slide the Control board straight up through the slots on
the heat sinks to disconnect it from the Power Supply/RF board.
Set the board aside in an antistatic container for reinstallation.
D. Remove the three screws (one plastic and two metal) that secure the
support bracket to the heat sinks. Save the screws and bracket for
reinstallation.
E. Disconnect the cable from the tank damping resistor on the right heat
sink from J12 on the Power Supply/RF board.
F. On the right side of the chassis, remove the two screws that secure the
base of the right heat sink to the rail under the Power Supply/
RF board. Save the screws for reinstallation.
G. Lift the heat sink to disconnect it from the Power Supply/RF board.
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 heat sink or replace components
on the heat sink. Component differences may affect output waveforms. Refer to
Calibrating the Generator in Section 5 for instructions.