Harman Kardon BDS 280 (serv.man6) Service Manual ▷ View online
5-6 Trouble shooting Chart
BD/DVD/CD no audio output
BD/DVD/CD no audio
output
output
Go
Check the audio of
COAXIAL mode is OK
Yes
No
Next actin g as the problem
5.1/2.1
channel no audio output
Check HDMI audio is ok
Yes
Replace the Main Board
No
Replace the Main Board
Harman Kardon
BDS 280 + 580 Service Manual
Page 29 of 87
5-7 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 Main board
No
Check Main board tuner voltage supply
circuit.
circuit.
No
Change the Tuner module
No
Check Tuner module
pin7,pin8,L/R output
pin7,pin8,L/R output
Yes
Yes
Check the U203 is
working normal
No
Yes
Replace U203
Replace Main Board
Harman Kardon
BDS 280 + 580 Service Manual
Page 30 of 87
5-8 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 Main board
Check the Main board
U203 AK5367 PIN2,PIN3,
PIN6,PIN7 L/R signal input
U203 AK5367 PIN2,PIN3,
PIN6,PIN7 L/R signal input
Yes
Check the main board R221—R224
and C284,C286,C288,C290
and C284,C286,C288,C290
No
Yes
Replace U203 AK536 7
Check
U203
AK5367 is broken.
Check the U28
No
Yes
Check the U203
AK5367
PIN30,VDD+5V,
AK5367
PIN30,VDD+5V,
Check the m ain board U203
power supply circuit
power supply circuit
No
Yes
Harman Kardon
BDS 280 + 580 Service Manual
Page 31 of 87
5-9 Trouble shooting Chart
IPOD in does not work
IPOD 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 Main board
Check whether USB can
work well on front USB port
work well on front USB port
Yes
Replace the USB board
No
Yes
Check the I2S Switch U26
Check MCU U21 is
work well
Replace U21
No
Yes
Check whether the
CP IC U44 is work
well
CP IC U44 is work
well
Replace U44
No
Yes
Check whether the
USB Switch U43 is
work well
USB Switch U43 is
work well
Yes
Replace U43
No
Harman Kardon
BDS 280 + 580 Service Manual
Page 32 of 87
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