Marantz NA8005, Service Manual

Page: 37 / 84

37
3.5. USB B
Check DC voltage
• DIGITAL PCB
• WF13 15 pin (USBB3.3V) : +3.3V
• WF13 17 pin (USBB1.8V) : +1.8V
• WF13 17 pin (USBB1.2V) : +1.2V
*When check the DC voltage, Use USBGND
on the
DIGITAL PCB.
Go to 1.Power not turn on.
Check I2S signal
•
DIGITAL PCB
• IC42 29 pin (USBB_LRCK) : LRCK clock ( 32KHz - 192KHz)
• IC42 30 pin (USBB_BCK) : BCK clock ( 2.112MHz - 12.288
MHz)
• IC42 28 pin (USBB_DATA) : PCM data
Go to 3.2. COAXIAL,OPTICAL
Check Master clock
• DIGITAL PCB
• IC42 31 pin (USBB_MCK) : 22.5792MHz or 24.576MHz
Check Soldering or replace.
• AUDIO PCB
• IC63, X601, X602, IC65 WF61, R637, R678
Check soldering or replace.
R437 - R475, RN34 or DIGITAL PCB
NO
NO
NO
YES
YES
YES