Valleylab Force FX-8C, Service Manual

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Left Front Heat Sink and Component Replacement
7-16 Force FX-8C Service Manual
If you plan to replace one or more components on the existing heat sink,
go to Step 2 – Replace Left Front Heat Sink Components.
or
If you plan to replace the entire left front heat sink assembly, go to
Step 3 – Install the Left Front Heat Sink.
Step 2 – Replace Left Front Heat Sink Components
Figure 7-3.
Replacing left front heat sink
components
• To replace one or more HVPS (high voltage power supply) output
diodes, remove the screw and shoulder washer that secure the diode to
the heat sink. Position the new diode on the heat sink and reinstall the
shoulder washer and screw.
• To replace the HVPS secondary damping resistor, remove the screw
that secures it to the heat sink. Position the new resistor on the heat
sink and reinstall the screw.
Step 3 – Install the Left Front Heat Sink
A.
Inspect the assembly for bent pins. On the left side of the chassis,
carefully slide the heat sink down into the matching connectors on the
Power Supply/RF board.
B.
Install the two screws that secure the left front heat sink to the rail
under the Power Supply/RF board.
C.
Position the support bracket over the heat sinks and install the three
screws that secure the bracket to the left rear heat sink (plastic screw)
and to the left front and right heat sinks (two metal screws).
D.
Install the Control board.
(1)
Position the Control board over the Power Supply/RF board with
the Control board components facing the rear panel. Fit the edges
of the board into the slots on the heat sinks. Slide the board down,
carefully fitting the edge connector into the matching connector on
the Power Supply/RF board.
(2)
Connect the display board ribbon cable to the Control board and
lock the connector.
E.
Position the cover above the chassis and slide it down. Install the five
screws that secure the cover to the chassis.
HVPS Output Diodes
HVPS Secondary Damping Resistor