Correcting IC U3 Malfunctions
6-20 Force FX-8C Service Manual
7. If the alarm number reappears, replace IC U3.
a. Turn off the generator. Disconnect the power cord from the wall
receptacle.
b. Remove the Control board (refer to step 3).
c. Grip IC U3 with the chip extractor and lift it out of its socket.
d. Align the notch on the new chip above the notch on the socket and
gently press the chip into the socket.
e. Install the Control board (refer to step 5).
8. Recalibrate the generator. If the calibration is successful, install the
cover (refer to step 11).
9. If the alarm number reappears, replace the Control board.
a. Turn off the generator. Disconnect the power cord from the wall
receptacle.
b. Remove the Control board (refer to step 3).
c. Install the new Control board (refer to step 5).
10. Recalibrate the generator. If the alarm number reappears, record the
number and call the Valleylab Service Center.
11. To install the cover, position the cover above the chassis and slide it
down. Install the five screws that secure the cover to the chassis.
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