EST EST3X - Fiber Network Option Module Troubleshooting

Chapter 7: Service and troubleshooting
176 EST3X Technical Reference Manual
Problem
Possible cause
No characters
show on the
LCD
screen, the control-
display module button
is
inoperative,
and the Power
LED
is off
• The ribbon cable between the LCD and CPU is loose or
defective
• The CPU is defective (replace the entire SFS1-ELEC
electronics chassis)
• The LCD is defective (replace the LCD on the SFS1-ELEC)
• The CPU is not configured in the 3-SDU for the 4X-LCD
• There is no power to the panel
Fiber Network Option module troubleshooting
The 3X-FIB8 and 3X-FIB fiber network option modules provide a fiber optic or
combination fiber optic and RS-485 communication path. The modules consist of
an adapter card and electronics card.
Separately ordered fiber optic transceivers are installed on the electronics card to
provide transmission and reception capability over the fiber optic cable. The
LEDs on the transceivers indicate loop activity.
Note: If a panel must be powered down for service, connect a backup power
source to the 24 VDC terminals (TB1) on the electronics card to maintain network
communication.
Figure 45: Fiber optic communication LEDs
TEST
NORMAL
A AUDIO B AUDIO
A DATAB D ATA
RX
TX
RX
TX
RX
TX
RX
TX
TB1
J2
(1)
(2)
(1) Transceiver RX/TX LEDs
(2) Fiber optic module electronics card