Valleylab Force FX-C - Page 149

Force FXTM-C Service Manual
f-H;:lCkfW RAM Malfunctions
5. On the Control board, verify that the pins on programmable IC U3 are
properly seated in their socket.
a.
Grip IC U3 with the chip extractor and lift it out of its socket.
b. Align the notch on IC U3 above the notch on the socket and gently
press the chip back into the socket.
6. 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
Pm'\.'er Supply /RF board.
b. Connect the display board ribbon cable to the Control board and
lock the connector.
7. Calibrate the generator. Refer to Section 5 for instructioIk'l. If the
calibration is successful, install the cover (refer to step 12).
8. If the alarm number reappears, replace IC U3.
a.
Turn off the generator.
b. Remove the Control board (refer to step 3).
c. Grip IC U3 with the chip exh'actor 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 6).
9. Reca.librate the generator. If the calibration is successful, install the
cover (refer to step 12).
10. If the alarm number reappears, replace the Control board.
a. Turn off the generator.
b. Remove the Control board (refer to step 3).
c. Install the new Control board (refer to step 6).
11. Recalibrate the generator. If the alarm number reappears, record the
number and call the Valley lab Service Center.
12. 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.
6-27