Harman Kardon BDS 280S - Page 22

5-10 Trouble shooting Chart
COAX/OPTICAL does not work
COAX/OPTICAL
does not work
Go
Check the DVD mode is
OK,audio output is ok
No
Replace the Main board
Check the coax/optical
connector is ok
Yes
Replace the connector
No
Yes
Replace U23 CS8422
Check U23 CS8422
is broken.
Check the U28
No
Yes
Check U23
PIN3,PIN22 +3.3V
Yes
Check the main board U23
power supply circuit
No