Marantz ND8006 Service Manual page 56

6. No Audio Output during USB DAC (USB-B input) Playback
Before testing circuit operation, check if the driver has been correctly installed on the PC, the PC software settings are correct and the USB cable is connected.
Does the power voltage supplied to XMOS SoC [U2502] largely deviate from 3.3V? (Within ± 0.3 V)
Check the [C2513] 100uF/6.3 + terminal voltage.
NO
Does the file type (PCM or DSD) and sampling frequency display on
the OLED display when a file is played from the PC?
YES
When playing back an audio file, are the I2S and DSD digital audio
waveforms output from the XMOS SoC [U2502]?
DIGITAL PCB
For I2S (PCM) :
[R2563]BCK, [R2564]LRCK, [R2565]PCM_DATA
For DSD :
[R2564]DBCK, [R2565]DSD_DATAL, [R2566]DSD_DATAR
NO
Is the Master Clock below corresponding to the file being played back output from PLD [U3001] to the
XMOS SoC [U2502]?
Fs=44.1kHz, 88.2kHz, 176.4kHz, 352.8kHz => 22.5792MHz
Fs=48.0kHz, 96.0kHz, 192.0kHz, 384.0kHz => 24.576MHz
YES
Check each part listed after "1.4. I2C Communication Line
If audio is still not output after checking the steps above, it is likely that there is a XMOS SoC [U2502]
chip malfunction. Replace [U2502] or the Digital PCB board if doing so proves too complicated.
NO
Is the problem the "marantz" PC driver, software settings or USB
cable disconnection/contact failure?
It is likely that there is a XMOS SoC [U2502] chip malfunction.
Replace [U2502] or the Digital PCB board if doing so proves too
complicated.
YES
Are waveforms from PLD [U3001] to XMOS SoC [U2502] output?
DIGITAL PCB
[L3005]BCK/DBCK, [L3004]LRCK/DSD_DATAL, [L3003]PCM_DATA/
DSD_DATA
Check each part in "4. Audio PCB Abnormalities and no Audio Output (Line Out, Variable Out, H/P
Abnormalities".
YES
Check each part listed after "1.2. Power Connection Wiring
NO
Install and set up the driver correctly as indicated in the instruction
manual.
YES
NO
There is a malfunction in communication between PLD [U3001]
and System uCOM [U1004] or in the PLD [U3001] unit.
If no abnormalities are apparent in the waveforms sent between
PLD [U3001] and System uCOM [U1004], replace PLD [U3001] or
the Digital PCB if doing so proves too complicated.
Communication waveform confirmation point of [U3001] and
[U1004].
[R3099]C_PLD_CLK, [R3102]C_PLD1_CS, [R3101]C_PLD_MDI
YES
NO
Check if there is contact failure or missing connector in the FFC connecting the Digital PCB [N3002] to
the Audio PCB [N1001].
Also check if a clock is supplied to the Digital PCB pin below.
[N3002][N1001]10pin: 24MHz, 12pin: 22MHz
If none of these abnormalities are apparent, replace PLD [U3001] or the Digital PCB board if doing so
proves too complicated.
56
Abnormalities".
Out)".