TROUBLE SHOOTING
1. The power cannot be turned on 2. No audio output from this unit
(Streaming/mobile Audio playback)
Is the front indicator blinking in
blue?
Are there any improper connec-
tions in the connectors between
each PCB?
Check the output voltage of
SMPS PCB.
[BN231 : 1pin] MCU+5V
[BN231 : 2pin] USB+5V
[BN231 : 7, 8pin] D5.2V
[BN231 : 11pin] -7V_A
[BN231 : 12pin] +7V_A
[BN231 : 14 pin] +12V
Check the output of SMPS PCB.
[BN623 : 2pin] -7V_A
[BN623 : 3pin] +7V_A
[BN623 : 5pin] +12V
Check the parts between con-
nector and the secondary circuit
(regulator) and replace any
faulty parts.
Replace the SMPS PCB.
Replace the SMPS PCB.
YES YES
OK
NG NO
NG
NG
Are the settings correct in the HEOS app for the mobile device?
Check the input of PLD (DIGITAL PCB)
[IC431 : 77pin] AIOS_MCLK
[IC431 : 78pin] AIOS_LRCLK
[IC431 : 81pin] AIOS_SCLK
[IC431 : 82pin] AIOS_I2S_OUT
Check the input of DSP*1
(DIGITAL PCB)
[IC401 : 92pin] DSPAI_MCLK
[IC401 : 94pin] DSPA_LRCLK
[IC401 : 73pin] DSPA_BCLK
[IC401 : 87pin] DSPA_DATI_0
Check the input of PLD (DIGITAL PCB)
[IC431 : 14pin] DSPA_LRCLK_OUT
[IC431 : 12pin] DSPA_BCLK_OUT
[IC431 : 55pin] DSPA_DATO_0
[IC431 : 56pin] DSPA_DATO_1
[IC431 : 57pin] DSPA_DATO_2
Check the input of MAIN DAC (DIGITAL PCB)
[IC451 : 6pin] MDAC_LRCK
[IC451 : 7pin] MDAC_BCLK
[IC451 : 8pin] MDAC_DATA0
[IC451 : 9pin] MDAC_DATA1
[IC451 : 10pin] MDAC_DATA2
[IC451 : 14pin] MDAC_MCK
Check the soldering of peripheral parts.
If there are no abnormalities, Network Module is
faulty.
Check the soldering of peripheral parts.
If there are no abnormalities, [IC431 PLD IC] is
faulty.
Check the soldering of peripheral parts.
If there are no abnormalities, [IC401 DSP IC] is
faulty.
Check the soldering of peripheral parts.
If there are no abnormalities, [IC431 PLD IC] is
faulty.
YES NO
YES
OK
OK
OK
OK
NO
NO
NO
NO
Is there a connection between the router and this
unit?
Connect router to this unit according to "QSG".
NO
Go to next page.
Remove the AC plug and then reinsert it.
Is the LED now lit in blue?
The AC plug connection is faulty.
Replace the faulty parts.
NO
46
Caution in
servicing
Electrical Mechanical Repair Information Updating
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