Daktronics CH-1024H - Manual (Page 19)

Section 3: Maintenance & Troubleshooting
Maintenance & 3-1
Troubleshooting
IMPORTANT NOTES:
1. Disconnect power before any repair or maintenance work is done on
the CH-1024H display!
2. Any access to internal display electronics must be made by qualified
service personnel.
3. Disconnect power when the CH-1024H display is not in use.
3.1 Lamp Replacement
Reference Drawing: Digit Service .............................................. Drawing A-27674
The primary service required by the CH-1024H display is to replace burned-out lamps. See
Drawing A-27674 for how to access the digit lamps for replacement. Standard replacement
lamps for the digits are 120V, 25W frosted medium base and may be obtained at your local
store or directly from Daktronics, part number DS-1029. Some displays may be equipped
with 120V, 30W reflector type 30R20 lamps, Daktronics part number DS-1126.
The Lap/Time indicators use 120V, 55W clear flood lamps, type 55PAR38, Daktronics part
number DS-1101.
The Status indicators use 120V, 85W flood lamps, type 85PAR38. The Daktronics part
numbers are as follows:
• Amber - Daktronics Part No. DS-1184
• Green - Daktronics Part No. DS-1185
• Red - Daktronics Part No. DS-1186
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.
3.2 Lamp Drivers
Reference Drawing: Multiplex Controllers.................................. Drawing A-37070
Component Location ................................. Drawing A-46464
In the scoreboard, the task of switching lamps on and off is performed by the lamp drivers.
Drawing A-46464 in Section 2 shows the location of the lamp driver in the display.
Drawing A-37070 shows the lamp driver and the fuses located in it.
The lamp driver has 22 connectors providing power and signal inputs to the circuit and
outputs to the digits.