Yamaha RS7000 Owner's Manual page 278

1. Installing Optional Equipment
Connect the 3-wire red/white cable.
7.
Of the two red/white cables that extend from the I/O expansion board, first connect the 3-wire cable to the connector shown in the
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illustration below (CN7: 3-pin).
Make sure that the direction is correct, and do not try to force the connection.
Connect the other red/white cable (4-wire) in the same way.
8.
Connect the cable to the connector shown below (CN2: 4-pin).
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Secure the cables to the bundle tie.
9.
Run the 3-wire and 4-wire cables through the bundle tie (see illustration below), and secure them.
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278 RS7000
Bundle tie