Daktronics CH-1436H - Manual (Page 19)

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.
3.1 Lamp Replacement
Reference Drawing: Digit Service .................................................. Drawing A-27674
The primary service required by the CH-1436H display is to replace burned-out lamps. Refer
to Drawing A-27674 for an illustration of 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.
Do not use lamps larger than those originally installed in the display. Using higher power
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 Driver
Reference Drawings: Lamp Driver, 16 col. w/ Fan......................... Drawing A-37070
Component Locations CH-1436H ............... Drawing A-63922
In the display, the task of switching lamps on and off is performed by the lamp driver.
Drawing A-63922 in Section 2 shows the location of the lamp driver in the display.
Drawing A-37070 is an illustration of the lamp driver and the fuses located in it.
The lamp driver has 21 connectors, providing power and signal inputs and outputs to digits.
The functions of these connectors are as follows:
Connector Number Function
1-16 Outputs to digits
17 Signal Input
18 Power input for outputs 1-8 (120 V)
19 Power input for driver logic and fan (120V)
20 Power input for outputs 9-16 (120V)
24 Dim option selector
In Drawing A-63922, the numbers on the digits refer to the lamp driver output connector
wired to each digit.
3.3 Digit Segmentation