Fender CYBER-TWIN Service Manual page 15

FX KILL/ FOOTSWITCH IS NOT WORKING
See Footswitch Notes on
Digital I/O Board Section
Schematics
(0055766000)
Voltage on
U26 Pins
NO YES
4,5,10,11,12
Power
Digital Activity
Supply
NO YES NO YES
on U26 Pins 7&15
OK
Troubleshoot Troubleshoot area
Ribbon Cable P4 Digital Activity
Power Supply around J3 or J5
on U26 Pin 13
OK
NO YES NO YES
Swap Ribbon Ribbon Cable P7 Swap U26 Ribbon Cable P4
OK
Cable P4 SN74HC166N OK
NO YES NO YES
Swap Ribbon Swap Front Panel Swap Ribbon Ribbon Cable P7
Cable P7 PCB Cable P4 OK
(0055754000)
NO YES
Swap Ribbon Swap Front Panel
Cable P7 PCB
(0055754000)