Check that the oscillator starts
DIGITAL PCB
Is there an oscillation waveform for [N202 (6, 8)pin]?
24.576MHz, 24.576MHz
Check that FPGA [U202] starts
DIGITAL PCB
Check the communication status for [U202, U206] (EPROM) at power
on
Check the AUDIO Signal input of USB-DAC -1 (Case of PCM44.1kHz)
DIGITAL PCB
[R230] : PCM_LRCK 44.1KHz
[R229] : PCM_BCK 2.8224MHz
[R231] : PCM_DATA 16bit I2S format
Check the AUDIO Signal input of USB-DAC -2 (Case of DSD2.8MHz)
DIGITAL PCB
[R230] : DSD_BCK 2.8224MHz
[R231] : DSDL (BCK : "
Hi
"→"
Lo
")
[R232] : DSDR (BCK : "
Hi
"→"
Lo
")
Check the AUDIO Signal output -1 (Case of USB-DAC PCM44.1kHz)
DIGITAL PCB Check the AUDIO DATA/CLK
Check the [N202] output signal WCK, BCK, PCM_DATA_L/_R
Is [R224] "
Hi
"? (USB-B mode)
Is [R225] "
Lo
"? (SPDIF mode)
Is [R226] "Lo"? (PCM or DSD)
Check the AUDIO Signal output-2
(Case of USB-DAC DSD2.8MHz)
DIGITAL PCB
Check the AUDIO DATA/CLK
Check the [N202] output signal DSD_BCK,DSD_DATA_L/_R
Is [R224] "
Hi
"? (USB-B mode)
Is [R225] "
Lo
"? (SPDIF mode)
Is [R226] "
Hi
"? (PCM or DSD)
Check the cable / connector and its connection.
Check soldering.
• Use a tool such as a circuit tester to check the SHORT/
OPEN state for the power supply and GND, etc.
• Check that the regulator is working properly
• Check that the element to which the power supply is
connected is not out of order
Check the cable / connector and its connection.
Check soldering.
・[N202, N401]
DAC PCB
・[U407, U408, U401]
Check soldering.
• [U202, R229-232, R735 - 738]
Check the cable / connector and its connection.
Check soldering.
• Check Power Supply for [U302] (3.3V, 2.5V, 1.2V)
• [U202, U206]
Check soldering.
• [U208 - U212, U202, U701]
Check soldering.
• [U202, R229-232, R735 - 738]
Check soldering.
• [U208 - U212, U202, U701]
Check Power Supply
DIGITAL PCB
Check the output voltage of [U201] 33_VCCIO : 3.3V
[U203, U204] 25_VCC : 2.5V
12_VCC : 1.2V
4. DIGITAL PCB
Check of DIGITAL signal processing part
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
36
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