Sony CDX-4000X Installation/Connections Manual page 6

Connections
Cautions
• This unit is designed for negative earth 12 V DC
operation only.
• Be careful not to pinch any wires between the
screw and the body of the car, or this unit. or
between any moving parts such as the seat
railing, etc.
• Connect the yellow and red power input leads
only after all other leads have been connected.
• Be sure to connect the red power input lead to
the positive 12 V power terminal which is
energized when the ignition key is in the
accessory position.
• Run all ground wires to a common earth
surface.
• Connect the yellow cord to a free car circuit
rated higher than the unit's fuse rating. If you
connect this unit in series with other stereo
components, the car circuit they are connected to
must be rated higher than the sum of the
individual component's fuse rating. If there are
no car circuits rated as high as the unit's fuse
rating, connect the unit directly to the battery. If
no car circuits are available for connecting this
unit, connect the unit to a car circuit rated higher
than the unit's fuse rating in such a way that if
the unit blows its fuse, no other circuits will be
cut off.
• The use of optical instruments with this product
will increase eye hazard.
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