Daktronics CH-1624V - Manual (Page 18)

Maintenance and Troubleshooting 3-2
3.3 Digit Segmentation
Reference Drawing: Segments, 4x7 Lamp Matrix Digit.................. Drawing A-37685
In a digit certain lamp always go on and off together. These groupings of lamps are known as
"segments". Each digit has eight segments, referred to by letters A through H. Drawing A-
37685 illustrates these segments and shows which connector pin and wire color is wired to
each segment.
3.4 Schematic
Reference Drawings: Schematic, 1 Driver Display ........................ Drawing A-46754
Pwr/Sig Entrance, 1 Driver Display ............. Drawing A-46755
Component Locations, CH-1624V .............. Drawing A-46756
The schematic diagram in Drawing A-46754 shows the power and signal inputs into the
display and to the lamp driver. The component numbers correspond to those shown in
Drawings A-46756 and A-46755.
3.5 Troubleshooting
This is a list of possible problems that may occur and their possible solutions.
Observed Problem Possible Cause
One lamp won’t light • Burned-out lamp
• Broken wire behind digit
Digit segment won’t light • Broken wire
• Poor contact at driver connector
• Internal driver malfunction
Entire digit won’t light • Broken wire (black)
• Poor contact at connector, pin 7
• Fuse blown in driver
Half the display won’t light
• Service breaker tripped
• Main fuse blown
• Poor contact at main power
connection
• P18 disconnected
Entire display won’t light • Power disruption
• Poor signal connection
• Driver logic fuse blown
• Control not connected to display
• P20 disconnected
Segment stays lit • Broken wire behind digit
• Internal driver malfunction
Garbled display • Control malfunction
• Internal driver malfunction
If a problem is observed in one digit, the cause may be isolated by swapping plugs on the
driver (connect the plug from the digit into a different jack). If the same digit shows the same