Harman Kardon BDS 270 Service Manual ▷ View online
Trouble shooting Chart
BD/DVD/CD no audio output
BD/DVD/CD no audio
output
output
Go
Check the 22pin cable
from BD to AM board is
connect well
from BD to AM board is
connect well
Yes
Reconnect well
No
Next actin g as the problem
5.1/2.1
channel no audio output
Check HDMI audio is ok
Yes
Turn to ON
No
Check the sof tware
setup HDMI audio
output is ON or OFF
output is ON or OFF
harman/kardon
BDS 270 + 570 Service Manual
Page 41 of 90
Trouble shooting Chart
Tuner FM does not work
Tuner FM does not work
Go
Check the DVD mode is
OK,audio output is ok
Yes
Check Tuner module
pin5 supply voltage is
+3.3V
pin5 supply voltage is
+3.3V
Replace the AM board
No
Check AM boa rd tuner voltage supply
circuit.
circuit.
No
Change the Tuner module
No
Check Tuner module
pin6,pin7,pin8,I2S output
pin6,pin7,pin8,I2S output
Yes
Yes
Check the U202
74LV541
74LV541
PIN20
VDD+3.3V,
No
Yes
Replace U202 74LV541
Check the m ain board U202
power supply circuit
power supply circuit
harman/kardon
BDS 270 + 570 Service Manual
Page 42 of 90
Trouble shooting Chart
AUX in does not work
AUX in does not
work
work
Go
Check the D VD mode is
OK,audio output is ok
OK,audio output is ok
No
Replace the AM board
Check the AM board U 18
AK5367
AK5367
PIN2,PIN3,
PIN4,PIN5 L/R signal input
Yes
Check
the
main
board
R301,R302,R303,R304
No
Yes
Replace U18 AK5367
Check U18 AK5367
is broken.
Check the U202 74LV541
No
Yes
check
the
U18
AK5367
PIN30,VDD+5V,
PIN30,VDD+5V,
Check the main board U18
power supply circuit
power supply circuit
No
Yes
harman/kardon
BDS 270 + 570 Service Manual
Page 43 of 90
Trouble shooting Chart
IPOD in does not work
IPOD in does not
work
Go
Check the D VD mode is
OK,audio output is ok
OK,audio output is ok
No
Replace the AM board
Check whether bad so lder
exists on pins of BRIDGE
Ⅲ
exists on pins of BRIDGE
Ⅲ
connector
Yes
Correct connection
No
Yes
Check the U18 AK5367 and
U202 7 4LV541
U202 7 4LV541
Check U719,U720
input and output
input and output
signal is ok
Replace U719, U720
No
Yes
Check whether the
remote can c ontrol
the IPOD unit
remote can c ontrol
the IPOD unit
Replace U721 or re place the
AM board
AM board
No
Yes
Check whether the
remote can c ontrol
the IPOD unit
remote can c ontrol
the IPOD unit
Yes
Check the IPOD po wer supply
IC U723 LM7808
IC U723 LM7808
No
harman/kardon
BDS 270 + 570 Service Manual
Page 44 of 90
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