Daktronics VANGUARD VL-3500 Series, Руководство пользователя

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Diagnostics and Troubleshooting
16
MLC (Optional)
The Multi-Line Controller (MLC) unit contains four red
diagnostic LEDs. When properly connected to the
primary display, the LED labeled DS23 (left side) will be
off and the other LEDs will be on, as shown in Figure 11 .
Troubleshooting Display Problems
This section contains some symptoms that may be
encountered with the displays. This list does not include
every possible symptom or solution but does represent
common situations and simple steps to resolve them.
Troubleshooting may require removal and replacement of modules. Refer to the
Accessing the Internal Components (p.11) section for more information. When
replacing modules, make sure that the power and signal cables are reconnected
correctly and the latches are tightly closed.
Before Calling for Help
Steps to take before calling Daktronics Customer Service:
1. Check the Diagnostics and Troubleshooting (p.15) section of this manual.
2. Call the service technician or Daktronics Customer Service at 800-833-3157.
Note: Sitting at the control computer while talking with the service technician will
allow more efficient service.
Common Misconception
Blank display seen after boot-up.
A blank display is normal after the boot-up procedure. The display is then waiting for a
message to be sent.
Module and LED problems
One or more LEDs are not lighting.
• Check/replace the ribbon cables on the
module.
• If that does not help, the module may need
to be replaced.
One or more LEDs on a single module will not turn off.
• Check/replace the ribbon cables on the module.
• If that does not help, the module may need to be replaced.
A section of the display is not working.
• Check/replace ribbon cables from the last working module in the row to the first
non-working module next to it. Refer to Figure 12 for an example.
• Check the back of the modules to see that the power LEDs are on.
• Make sure the power cable to the module is connected.
Figure 11: MLC Diagnostics
Figure 12: Modules Not Working