Network/Usb Troubleshooting; Cannot Connect To Network - Troubleshooting Chart - Denon AVR-3808CI Service Manual

4. Network/USB
4.1. Cannot connect to network
Checking the environment
Is the LAN cable properly con- Check the LAN cable properly
NO
nected? then turn the power back on.
YES
Checking the settings
Are the set's network settings correct?
YES
Are the router, hub and other peripherals properly connected?
YES
Are the router's settings correct?
YES
Is a voltage (5V) being outputted between CY421 pins 1 and 4?
YES
Is the IC412 input voltage (3.3V) being outputted?
YES
Is the IC412 output voltage (1.9V) being outputted?
YES
Is the wire properly connected between CX136 and CY136?
YES
Is operation normal when the 1U-3799 circuit board is replaced?
YES
The 1U-3804-2 circuit board may be defective.
Set the IP address and other parameters properly. For a fixed IP set-
NO
ting, check whether the IP address is redundant with that of other
devices, and check whether the subnet mask setting is correct.
NO
Connect properly to peripherals.
NO Check the router's operating instructions and set properly. Check
whether there are connection restrictions due to the MAC address, etc.
Checking the set
NO
The circuit from AC inlet to CY421 is defective.
NO
The IC410 periphery or 3.3V device circuitry is defective.
NO
The IC412 periphery or IC405 periphery circuitry is defective.
NO
Connect the wire properly.
NO
The ETHERNET circuitry is defective.
NO
YES
48
AVR-3808CI / AVR-3808 / AVC-3808
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES