Clarion VMA773 - Manual (Page 27)

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Wiring the monitor
3. Create passage holes for the power and video cables.
When drilling through metal or plastic, use grommets to protect the cables
from sharp edges that could penetrate the insulation and cause a short
circuit and device failure.
4. Connect the ground lead (black) securely to a clean metal plate on the
vehicle.
Use sand paper to remove any paint from the surface where you attach
the ground terminal.
5. Reconnect the negative (-) lead to the battery.
Monitor connections
IR connector polarity :
PLASTIC COVER
This 3.5Φ IR Jack has plastic cover to prevent short, to remove the plastic
cover, please do not pull it out directly, please rotate the plastic cover and put it
out slowly.
Some non-Clarion automotive DVD and VCP source
units use a similar connector for an external IR receiver,
but use different pin polarity than the Clarion uses.
Connecting non-Clarion source equipment to this
connector could cause equipment damage not covered
by the warranty!
CAUTION !