Valleylab Force FX-C - Page 128

Correcting Malfunctions
Situation
Blank or confusing LED
display.
Mode buttons do not
function correctly when
pressed.
6-6
Possible Cause Recommended Action
Faulty ribbon cable between Control board Check/connect ribbon cable that connects the Display
and Display board. board to the Control board.
Incorrect display modes communicated
through the Control board.
Display board malfunction.
Faulty ribbon cable between Control board
and Display board.
Incorrect modes communicated through
the Control board.
Faulty ribbon cable between the front
panel and the Display board.
Incorrect modes are being communicated
from the front panel.
Replace the Control board. Refer to Control Board
Replacement in Section 7
Replace the Display board. Refer to Display Board
Replacement in Section 7
Check/connect ribbon cable that connects the Display
board to the Control board.
Replace the Control board. Refer to Control Board
Replacement in Section 7.
Check/connect the ribbon cable that connects the
Display board to the front panel.
Replace the front panel. Refer to Front Panel
Replacement in Section 7.
Force FXf'M-C Service Manual