Marantz AV7005/N1B Service Manual page 34

2.5. Communication check
(1) Click the "Check Comm." button.
(2) When connection is good, then you can see the "Communication check OK." message.
(3) If connection is not good, then you can see the "Communication error!" message.
Please confi rm the following
(a) Check the connection of the AV receiver and PC. (refer to "2.2. Connection of the AV receiver" )
(b) Check the operation mode of the AV receiver. (refer to "2.3. Turn on the AV receiver")
(c) Check the selection of the RS-232C port number of PC.
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