Denon AVR-4520, Service Manual

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114
YES
YES
YES
YES
YES
YES
YES
Is the set connected to the network by connecting the LAN cable to
any of the ports?
Is the 8U-210119-8 board inserted to the 8U-310115-2 board
properly?
Is the voltage across C775 on the 8U-310115-2 board 3.3V?
Is the voltage across C746 on the 8U-310115-2 board 1.8V?
Is the voltage for 33 pin on the 8U-310115-2 board 5.2V?
Is output voltage (3.3V) supplied from U609?
Is output voltage (1.2V) supplied from U608?
Is the version of IMG or Ethernet SBL displayed with Version check
mode?
The U706 or U702 and surrounding circuitry are defective.
A part between U702-N701 on the 8U-
310115-2 board has poor soldering or is
defective.
Connect them properly.
U705 peripheral circuits on the 8U-310115-2
board have poor soldering or are defective.
Q701 peripheral circuits on the 8U-310115-2
board have poor soldering or are defective.
The circuit from AC inlet to N605 is
defective.
The U609 and surrounding circuitry or
circuitry of 3.3v device is defective.
The U608 or U503 and surrounding circuitry
is defective.
The firmware of ethernet is defective.
NO
NO
NO
NO
NO
NO
NO
It is not connected
through a specific port.
It is not connected through all port.