Wiring Diagram; Troubleshooting - NorthStar 972 Install Manual

Wiring Diagram

972 Black Box
WA621
Y-Cable
Keep connectors dry
Note 1
Note 1: Connect WA621 Y-Cable directly to Black Box. Do not extend the cable.
Note 2: Use only DVI cable included in 972DH-IK to connect DVI Mini Hub to Black Box.
Note 3: Mount DVI Mini Hub in dry location; it is not waterproof.

Troubleshooting

Control heads turn
themselves on or off
Display not functioning
Keyboard not functioning
GM972DH
12 or 24V
DC Power
Note 2
Mount in a
dry location
DVI
6 ft. DVI Cable
Mini
Hub
Control Cables
WA612-9
or
WA612-15
Keep connectors dry.
If you experience problems with heads turning themselves on or off, it's most likely due to
ground lift within your system. This means that ground at the Black Box is different from
the ground at a Control Head. This is caused by a voltage drop over the cables connecting
the equipment to the voltage source (battery).
Verify this by measuring the voltage between the two grounds with a voltmeter. Best
practice suggests this voltage ought not be over 100mV (0.1V)
Isolate the DVI Mini Hub by connecting the suspect Control Head directly to the Black Box.
If the display is still not working, try another Control Head or DVI monitor. Then try
another DVI cable.
This systematic approach isolates each component in the display chain.
As above with the display function, try connecting the suspect control cable directly to the
Black Box — without the Y-Cable in place. An alternate control cable and Y-Cable may be
substituted as well to help isolate the problem.
Northstar 972 Dual Head Install Guide
972 Control Head - Upper Helm
Note 3
972 Control Head - Lower Helm
Pwr
Ctl
DVI Cables
WC276-9
or
WC276-15
Pwr
Ctl
12 or 24V
DC Power
Revision B