Fender Cyber-Twin Service Manual - page 6

CYBER-TWIN Service Manual

NO AUDIO ON HEADPHONES JACK (cont)

3.  If there is Audio Output through the Speakers, check if ribbon cable P3 is OK.

3.1 If the ribbon cable is OK, then swap the Analog I/O PCB.

3.2 If the ribbon cable is defective, then swap the cable.

FX KILL/ FOOTSWITCH IS NOT WORKING

Setup: See Footswitch Notes on the Digital I/O Board Section Schematics (0055766000 Sheet 3).

1.  Check the Voltage on U26 Pins 4,5,10,11,12.

2.  If the Voltages are not correct check the Power Supply.

2.1. If the Power Supply is OK check the area around J3 and J5.

3.  If the Voltages are correct check for Digital Activity on U26 Pins 7 & 15.

3.1. If there is no Digital Activity on Pins 7 & 15 check the Ribbon Cable P4 and swap if

necessary.

3.1.1.  If the Ribbon Cable on P4 is OK, check the Ribbon cable on P7.  Swap if necessary,

otherwise swap the Front Panel PCB (0055754000).

4.  If there is Digital Activity on Pins 7 & 15, check for Digital Activity on U26 Pin 13.

4.1. If there is no Digital Activity on Pin 13 swap U26, otherwise check the Ribbon Cable P4

and swap if necessary.

4.1.1.  If the Ribbon Cable on P4 is OK, check the Ribbon Cable on P7.  Swap if

necessary, otherwise swap the Front Panel PCB (0055754000).