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Pelco Manual C2434M (7/01) 9
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION
Unit does not operate.
The controller is not
communicating with
the Spectra unit.
Fan does not
operate.
Vertical roll on monitor
when switching
between cameras.
DOME 1
POWER
DOME 2
POWER
DOME 3
POWER
Check to see if the red LED on the circuit
board in the back box is lit.
1. The red LED is not lit.
a. Fuse is bad.
b. 24 VAC power source is not con-
nected or back box is bad.
2. The red LED is lit.
a. Wiring is incorrect or is not fully
seated.
b. DIP switch settings are incorrect.
Fan connections are not fully seated.
Cameras are out of phase.
a. Check fuse on the circuit board. Replace fuse if it is
bad. To order a fuse from Pelco, specify the part
number FUS1.6-5X20FAST. This is a 1.6-ampere
fuse, 5 x 20 mm, fast blow.
b. Use a voltmeter to check if 24 VAC is getting to the
power connector on the circuit board. If NO, check
your power supply. If YES, return the back box to
the factory for repair.
a. Check all connections to the circuit board.
Make sure that all connections are fully seated and
the board is wired correctly.
b. Check the DIP switch settings on the dome drive
(refer to Tables C, D, and E). If the unit still does
not operate, turn off power and replace the dome
drive with a good unit, if you have a spare. Check
the switch settings on the substitute dome drive
before installing it. (If you do not have a spare,
return the dome drive and back box to the factory.)
If you substituted a dome drive and the unit
operates, the original dome drive is bad (return
the dome drive to the factory). If the unit still
does not operate, then the circuit board is bad
(return the back box to the factory).
Make sure the connector for the fan is fully seated. If
the fan still does not operate, return the back box and
dome drive to the factory for repair.
If you are wiring more than one dome to the same
transformer, it is important to wire the power connec-
tor in each dome the same way. That is, the wiring
from one side of the transformer must be connected
to the same connector on each dome.
WARNING: Make
sure you wire power
to the outer connec-
tors of the terminal
block and ground to
the middle connec-
tor. Otherwise, you
could damage the