Fender CYBER-TWIN Service Manual page 5

MOTOR POT DOES NOT WORK
Setup: Follow the Motor Pot Test instructions described on the Motor Pot A/D Section Schematics
(005576600 Sheet 4).
1. If the Motor Pots do not work then check if the Power Supplies are OK and troubleshoot if
necessary.
2. If the Power Supplies are OK, check the voltage on the PW# Pins while running the Pot test.
3. If the correct voltage is present on the PW# Pins, then swap the damaged Motor Pots.
4. If there is no voltage present on the PW# Pins, then check for the correct voltage, specified on
the Schematics, on Pin 1 & 3 of the BA6218 controllers.
5. If there is a voltage on the input of the BA6218 controllers, but the Motor Pot does not work,
then swap the damaged BA6218.
6. If there is no Voltage present on Pin 1 & 3 of the BA6218 controllers, then proceed to the
Digital Test described on the Motor Pot A/D Section Schematics (0055766000 Sheet 4).
MIDI IS NOT WORKING
Setup: Follow the Midi Test instructions described on the Digital I/O Board Section Schematics
(0055766000 Sheet 3).
1. Check for Midi activity on the Midi test points.
2. Check for Midi activity on P5B Pin 1 & 3.
2.1 If there is Midi activity on P5B Pin 1 & 3, then troubleshoot in the area around
U33 and U34 or swap Digital I/O boards.
2.2 If there is no Midi activity on P5B Pin 1 & 3, then check if ribbon cable on P5 is OK.
3 If the ribbon cable on P5 is OK, check the ribbon cable on P6, otherwise swap the ribbon
cable on P5.
4 If the ribbon cable on P6 is OK, swap the Host PCB, otherwise swap the ribbon cable on P6.
NO AUDIO ON HEADPHONES JACK
Setup: Follow the instructions as stated under notes 8, on the Cyber-Twin Main Schematics
(0055766000 Sheet1).
1. Check for Audio Output through the Speakers with Headphones unplugged.
2. If there is no Audio Output through the Speakers proceed to the previous troubleshooting
section NO AUDIO.
CYBER-TWIN Service Manual