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Pelco Manual C939M-D (7/00) 9
RANDOM SCAN
To start random scanning, call preset 97.
To stop random scanning, call preset 96.
When random scanning starts, the pan/tilt unit moves to the left for 60 seconds or until it
hits a limit stop. When a limit stop is hit, the unit pans to the right for 60 seconds or until it
hits a limit stop. The receiver then starts a random cycle of movement, panning and stop-
ping for a random amount of time.
If there are no limit stops, the movement time varies between 1 and 60 seconds. If there are
limit stops, the movement time varies between 1 second and the time it takes to move be-
tween the limit stops. The time between movement varies from 4 to 60 seconds. If any mo-
tion command or alarm is received during random scan, the scan is aborted.
TROUBLESHOOTING
RESET
If the receiver settings are changed (for example, DIP switch or voltage settings) or if the
unit locks up, press the reset button located on the main PC board. Refer to Figure 1.
The reset command starts the receiver’s configuration cycle. The pan/tilt unit tilts down and
pans left, followed by a tilt up and a pan to the right. The lens zooms out and focuses far.
The lens zooms in and focuses near. The receiver will not accept any commands during the
configuration cycle.
SERVICE MANUAL
If you need to service your unit, obtain a service manual in one of the following ways:
• Go to Pelco’s web site at ftp://www.pelco.com and find service manual C939SM.
• Call Pelco’s DataFAX service at 1-800-289-9108 or 1-559-292-04335 and request
document 29398.
• Contact Pelco’s Literature Department and request service manual C939SM.