Valleylab Force FX-8C - Page 134

Correcting Malfunctions
6-6 Force FX-8C Service Manual
Blank or confusing LED
display
Faulty ribbon cable between Control board
and Display board
Check/connect ribbon cable that connects the Display
board to the Control board.
Incorrect display modes communicated
through the Control board
Replace the Control board. Refer to Control Board
Replacement in Section 7.
Display board malfunction Replace the Display board. Refer to Display Board
Replacement in Section 7.
Mode buttons do not
function correctly when
pressed
Faulty ribbon cable between Control board
and Display board
Check/connect ribbon cable that connects the Display
board to the Control board.
Incorrect modes communicated through
the Control board
Replace the Control board. Refer to Control Board
Replacement in Section 7.
Faulty ribbon cable between the front
panel and the Display board
Check/connect the ribbon cable that connects the
Display board to the front panel.
Incorrect modes are being communicated
from the front panel
Replace the front panel. Refer to Front Panel
Replacement in Section 7.
Situation Possible Cause Recommended Action