Denon PMA-1600NE Service Manual page 47

4. DIGITAL PCB (Check of DIGITAL signal processing part)
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
OK
Check that the oscillator starts
DIGITAL PCB
Is there an oscillation waveform for [N1810 : 5,
7pin]?
24.576MHz, 24.576MHz
OK
Check that FPGA [U202] starts
DIGITAL PCB
Check the communication status for [U202, U206]
(EPROM) at power on
OK
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
OK
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")
OK
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)
OK
NG
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
NG
Check the cable / connector and its connection.
Check soldering.
・[N1810, N1811]
INPUT PCB
・[U407, U408, U403]
NG
Check the cable / connector and its connection.
Check soldering.
• Check Power Supply for [U202] (3.3V, 2.5V, 1.2V)
• [U202, U206]
NG
Check soldering.
• [U202, R229 - 232, R735 - 738]
NG
Check soldering.
• [U202, R229 - 232, R735 - 738]
NG
Check soldering.
• [U208 - U212, U202, U701]
OK
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)
OK
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
OK
Check the DIGITAL Signal output -2 (COAX/OPT)
DIGITAL PCB
Is an SPDIF signal input to [U501 : 4, 6, 37pin]?
OK
END
47
NG
Check soldering.
• [U208 - U212, U202, U701]
NG
Check the cable / connector and its connection.
Check soldering.
• [R510 - 513]
NG
Check the cable / connector and its connection.
Check soldering.
• [U501, R502, K501 - 504]