Marantz SA8004/K1SG Service Manual page 42

8U-210103-3(DIR,USB_DAC UNIT)
Check the Power Supply-1
8U-210103-3
・Check the voltage of N631 2pin : 3.3V
Check signal of U634 (DIR)
8U-210103-3
41pin : Is DIR_RES "H"?
・U634
・Check starting oscilltor
U634 28pin : 24.576MHz
・Check signal of U634
40pin
39pin
38pin
37pin
Check DIR output signal-1
8U-210103-3
16pin MCK
・U634
17pin SCLK
・U634
20pin LRCK
・U634
21pin DATA
・U634
Check signal of U632(REAR USB DAC)
8U-210103-3
・Check starting oscilltor
U632 38pin : 12MHz
16pin : Is RESET "H"?
・U632
・Check D+,D- signal of U632
・Check SPDIF output of U632
O.K.
: CLOCK
: CHIP ENABLE
: DATA IN
: DATA OUT
t DIR_CL
y DIR_CE
u DIR_DI
i DIR_DO
O.K.
output
output
output
output
Q2 DIR_MCLK
Q1 DIR_SCLK
o DIR_DATA
Q0 DIR_LRCK
O.K.
34,35pin
27pin
Q3 D+
Q4 D-
O.K.
END
Check the cable and the connection of connector.
N.G.
Check soldering.
・N601
N.G.
Check soldering.
・U634,R664,R666,R669,R670,R671
N.G.
Check soldering.
・U634,R667,R665,R662,R661
N.G.
Check soldering.
・U632,K632,R690,R691,R668,R643
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