Valleylab Force FX-8C, Service Manual

Page: 149 / 218

Correcting IC U6 Malfunctions
Troubleshooting
Force FX-8C Service Manual 6-21
Correcting IC U6 Malfunctions
Equipment required:
• Phillips screwdriver
• Surface mount, quad pack chip extractor.
1. Turn off the generator. Disconnect the power cord from the wall
receptacle.
2. Remove the five screws that secure the cover to the chassis. Lift the
cover off the chassis.
3. Remove the Control board.
a. Unlock the connector on the Control board and disconnect the
display board ribbon cable from the Control board.
b. Carefully slide the Control board straight up through the slots in
the heat sinks to disconnect it from the Power Supply/RF board.
4. On the Control board, verify that the pins on programmable IC U6 are
properly seated in their socket.
a. Grip IC U6 with the chip extractor and lift it out of its socket.
b. Align the notch on IC U6 above the notch on the socket and gently
press the chip back into the socket.
5. Install the Control board.
a. Position the Control board over the Power Supply/RF board with
the 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.
b. Connect the display board ribbon cable to the Control board and
lock the connector.
6. Turn on the generator. If the self-test completes successfully, install the
cover (refer to step 12).
Warning
Electric Shock Hazard
To allow stored energy to dissipate after power is
disconnected, wait at least five minutes before replacing parts.
Electric Shock Hazard Do not touch any exposed wiring or conductive surfaces
while the generator is disassembled and energized. Never wear a grounding
strap when working on an energized generator.
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.