Fender Cyber-Twin Service Manual - page 11
NO AUDIO
NO
YES
YES
NO
YES
YES
NO
NO
YES
NO
YES
NO
NO
YES
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Power Switch
Jewel LED
On
VFD
On
Audio
Amp
OK
Audio
Audio
Check
Jewel LED
Check
Power Supplies
Speakers Plugged In
(Remove any plugs
from the rear panel)
Check
VFD
Power Supplies
OK
Troubleshoot
Power Supplies
Power Supplies
OK
Plug In
Speakers
Troubleshoot
Power Supplies
Ribbon Cables
OK
Swap
Ribbon Cables
Swap
Host PCB
(0055736000)
Audio on
Effects Send
Audio on
U7 Pin1
Main PCB
(0055766000)
Audio on
P3B Pin7&8
Analog I/O PCB
(0056333000)
Swap
Analog I/O PCB
(0056333000)
Audio on
P2B Pin1&3
Host PCB
(0055736000)
Audio on
P1B Pin7&8
Host PCB
(0055736000)
Swap
Host PCB
(0055736000)
Troubleshoot
Pre-Amp Section
on Main PCB
(0055766000)
Audio on
P1B Pin1&2
Host PCB
(0055736000)
Swap
Host PCB
(0055736000)
Troubleshoot
Power Amp
Section on
Main PCB
(0055766000)
Troubleshoot
Distortion
Section on
Main PCB
(0055766000)