Marantz HD-DAC1 Service Manual page 44

3.5. USB B
Check DC voltage
DIGITAL PCB (CUP12688)
IC15 3pin : +1.8V
IC16 3pin : +1.2V
Q104 1pin : +3.3V
Check Master clock
DIGITAL PCB (CUP12688)
IC44 2pin (USBB_MCK_USB) : 22.5792MHz or 24.576MHz
Check I2S signal
DIGITAL PCB (CUP12688)
IC42 29pin (USBB_LRCK) : LRCK clock ( 32KHz - 192KHz)
IC42 30pin (USBB_BCK) : BCK clock ( 2.112MHz - 12.288
MHz)
IC42 28pin (USBB_DATA) : PCM data
Go to 3.2. COAXIAL,OPTICAL
YES
YES
YES
NO
Go to 1.Power not turn on.
Check Soldering or replace.
NO
MAIN : AUDIO PART PCB (CUP12689-1)
X601, X602 WF61, R81, L607, R84, L608
DIGITAL PCB (CUP12688)
IC56 6pin, 7pin
IC24 1pin, 2pin, 3pin, 4pin
IC24 13pin, 12pin, 11pin, 10pin
IC21 35pin, 38pin, 83pin
NO
Check soldering or replace.
R408 - R410, RN34 or DIGITAL PCB (CUP12688)
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