Daktronics AB-1600-1.5,2.5 - Manual (Page 52)

Maintenance & Troubleshooting 4-16
4.12 Troubleshooting the Internal Temperature Monitoring System
The fan controller enclosure, found within the display, contains various components for monitoring
and controlling the fans in the display. Twelve LED indicators on the fan controller card report the
status of the temperature monitoring system, as illustrated below.
The fan controller card, found in the fan controller enclosure, Figure 53, accepts signal from a
maximum of eight fans.
If the RPM of any fan goes below a certain rate, the fan controller will send a signal to the display
controller to blank the display. Bad fan bearings may cause a fan to run slowly. Use a pen or pencil to
spin the fan. If the fan bearings are bad, the fan will not spin freely–refer to Section 4.11 for more
information regarding fans. A slow fan can also be caused by a plugged filter–refer to Section 4.10
for filter maintenance information.
The following table describes the function of each LED indicator on the fan controller card.
LED indicator LED – On LED – Off LED – Blinking
DS 1 Power Power on Power off –
DS 2 Section
Status Section good Section failure –
DS 3 Fan Power Fan power on Fan power off –
DS 4 Fan 1 Status Fan good Fan not present Fan failure
DS 5 Fan 2 Status Fan good Fan not present Fan failure
DS 6 Fan 3 Status Fan good Fan not present Fan failure
DS 7 Fan 4 Status Fan good Fan not present Fan failure
DS 8 Fan 5 Status Fan good Fan not present Fan failure
DS 9 Fan 6 Status Fan good Fan not present Fan failure
DS 10 Fan 7
Status Fan good Fan not present Fan failure
Power Indicator
DS1
Section Status
Indicator
DS2
Power In and control
for fan relay
J2 (In from fan and
thermostat harness)
Fan Power Status
DS3
Fan Indicators
J4 (Out to the next fan controller
or terminator plug) J3 (In from display controller
or previous fan controller
Fan Controller Enclosure
Fan Controller Card
DS4 DS5
DS6 DS7
DS8 DS9
DS10 DS11
DS12
Figure 53: Fan Controller Card