Harman Kardon HK BDS 270

Trouble shooting Chart
COAX/OPTICAL does not work
COAX/OPTICAL
does not work
Go
Check the D VD mode is
OK,audio output is ok
No
Replace the AM board
Check the coax/optical
RCA connector is ok
Yes
Replace the RCA connector
No
Yes
Replace U714 CS8422
Check U714
CS8422 is broken.
Check the U202 74LV541
No
Yes
Check U714
PIN3,PIN22 +3.3V
Yes
Check the main boar d
U714power supply circuit
No
harman/kardon
BDS 270 + 570 Service Manual
Page 45 of 90