NEC LED-E012i Installation And Maintenance Manual page 48

Led display kit
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(2) Problem with the LED modules
To display more details, click "Monitoring", and then click "Receiving card" on the screen that is displayed.
With the connection shown in the figure below.
English - 46
When the display is red,
there is a problem with the
LED module operation.
In the example shown on the left, the
following problems must be considered.
- Signal loss between the screen of the
1st row 3rd column and the screen of
the 1st row 2nd column
→ Check the LAN cable.
- Problem with the power unit of the
screen of the 1st row 2nd column
- Problem with the receiving card of the
screen of the 1st row 2nd column.
→ Check that the receiving card is
securely connected.

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