Daktronics CH-1036V - Manual (Page 17)

Section 3 : Maintenance & Troubleshooting
Maintenance &
Troubleshooting 3-1
IMPORTANT NOTES:
1. Disconnect power before any repair or maintenance work is done on
the display!
2. Any access to internal display electronics must be made by qualified
service personnel.
3. Disconnect power when the display is not in use.
4. Displays are FRONT access only!
3.1 Lamp Replacement
Reference Drawing: Digit Service .................................................. Drawing A-27674
The primary service required by the displays is to replace burned-out lamps. Refer to
Drawing A-27674 for an illustration of lamp changing. Do not use lamps larger than those
originally installed in the display. Using higher powered lamps will likely cause fuse failures
in the display and could exceed the current levels that the display’s circuits can safely handle.
The Lap/Time indicators use 120 volt, 55 watt clear flood lamps, type 55PAR38. The Status
indicators use 120 volt, 85 watt flood lamps, type 85PAR38. Digits use 130 volt, 30 watt
reflector lamps, type 30R20.
3.2
The Lamp Driver
Reference Drawing: Lamp Driver, 16 Col. w/ Fan.......................... Drawing A-37070
Refer to Drawing A-37070 for an illustration of the lamp driver. In the display, the task of
switching lamps on and off is performed by the lamp driver. The lamp driver has 21
connectors, providing power and signal inputs and outputs to digits. The functions of these
connectors are illustrated in the following table.
Connector No. Function
1-16 Outputs to digits and indicators
17 Control signal input
18 Power input for outputs 1-8
19 Power input (120V) for driver logic
20 Power input for outputs 9-16
24 Dim option selector