Denon Home 250 Service Manual page 46

TROUBLE SHOOTING
1. The unit does not power on
NO
Are there any improper connec-
Is the status LED on the front
tions in the connectors between
blue?
each PCB?
YES
Connect the connectors correctly.
Remove the AC plug and then reinsert it.
Is the Status LED now lit in blue?
YES
Reset this unit and check again from the start.
NO Check the parts of the secondary
power circuit, such as the SMPS
PCB and regulator, and replace
any faulty parts.
YES
NO
The AC inlet is not making proper contact. Replace
the faulty part.
2. No sound from the output speakers
Is there a connection between the router and this
unit?
YES
Are the settings correct in the HEOS app?
YES
Check the audio DSP input.
INPUT :
[IC1001 : 1pin] PLD_BCLK
[IC1001 : 2pin] PLD_DATA
[IC1001 : 3pin] PLD_LRCK
OK
Check the digital amp input.
INPUT : [IC2001, IC2002]
6pin CH*A
8pin CH*B
16pin CH*A
18pin CH*B
OK
Check the digital amp output.
OUTPUT : [IC2001, IC2002]
39pin OUT_A
36pin OUT_B
31pin OUT_C
28pin OUT_D
OK
Check the soldering of peripheral parts.
If nothing is abnormal, the speaker unit is faulty.
46
NO
Connect router to this unit according to "QUICK
SETUP GUIDE".
NO
NG
Check the soldering of peripheral parts.
If there are no abnormalities, Network Module is
faulty.
NG
Check the soldering of peripheral parts.
If there are no abnormalities, [Audio DSP IC] is
faulty.
NG
Check the soldering of peripheral parts.
If there are no abnormalities, [Digital amp IC] is
faulty.