Maintenance and Troubleshooting
16
The following table details information that each LED provides. Refer to
illustration of the signal converter.
Ethernet Surge Card
An Ethernet surge card is an inline device that filters the Ethernet
data line. It suppresses surges down to a low voltage in order to
protect the display controller’s Ethernet input. If a surge card is
included with the display, it is located in the interior of the display.
To replace a surge card:
1.
Disconnect the input and output signal connections.
2.
Carefully remove the four nuts holding the surge card in place
using a
5
/
16
" nut driver.
3.
Install the new surge card and reconnect the signal cables.
LED
Indicator Typical States
Troubleshooting
Power
On
Signal Converter (SC) is receiving
power.
Off
SC is not receiving power.
Internal 1 AMP fuse is bad.
Replace SC.
TX
On Steady
SC is not connected to a serial
port.
Connect to open computer serial
port.
1. Serial Port or serial cable is bad.
2. Computer serial port in sleep
mode.
1. Try another port or replace
serial cable.
2. Communicate to display.
Off Steady
Normal state; SC is not
transmitting data.
Brief Flicker
SC is transmitting data.
RX
On Steady
1. Field cable between SC and
display is bad.
2. Connected to display output
jack or terminated incorrectly.
3. Bad serial port on display
controller.
1. Eliminate cabling by
disconnecting wire/cable from
SC to display controller.
2. Check connections and
terminations.
3. Eliminate by disconnecting
wire/cable to display controller.
Off Steady
Normal state; SC is not receiving
data.
Brief Flicker
SC is receiving data.
TX/RX
On Steady
(If serial cable is connected) Bad
SC.
Replace SC.
Figure 8:
Ethernet
Surge Card
