Check that the oscillator starts
DIGITAL PCB
Is there an oscillation waveform for [N1810 : 5,
7pin]?
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 [N1810] 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 sup-
ply is connected is not out of order
Check the cable / connector and its connection.
Check soldering.
・[N1810, N1811]
INPUT PCB
・[U407, U408, U403]
Check soldering.
• [U202, R229 - 232, R735 - 738]
Check the cable / connector and its connection.
Check soldering.
• Check Power Supply for [U202] (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
Check the DIGITAL Signal output -1 (COAX/OPT)
DIGITAL PCB
• Check Power Supply for [U501]
33_VCC_
DIR:3.3V
• Check the [U501 : 34pin] for RESET REST :
"Hi"
• Check the [U501 : 40pin] for oscillator
24.576MHz
• Check the communication of [U501, U202] DIR_
CE,DIR_CLK,DIR_DI,DIR_DO
Check the DIGITAL Signal output -2 (COAX/OPT)
DIGITAL PCB
Is an SPDIF signal input to [U501 : 4, 6, 37pin]?
Check the cable / connector and its connection.
Check soldering.
• [R510 - 513]
Check the cable / connector and its connection.
Check soldering.
• [U501, R502, K501 - 504]
END
4. DIGITAL PCB (Check of DIGITAL signal processing part)
NG
NG
NG
NG
NG
NG
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
47
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
