15-B Maintenance Mnl, GFZ-62075E/03 - Automation Service Srl

3. TROUBLESHOOTING AND ACTION TO BE TAKEN
B–62075E/03
3.2.3 Lighting of alarm LEDs on PCBs
If an alarm condition occurs, an alarm message is usually displayed on the CRT screen. The state of the PCB
when the alarm occurred is indicated by the LEDs on the front panel of each control unit PCBs, as shown below.
When a system alarm occurs, the alarm message displayed on the screen, together with the LED indications
on each PCB, help you to determine the cause. Record the LED indications for each PCB to enable rapid recovery
of the system.
For the descriptions of LED lamps on each printed circuit board, see Chapter 7.
STATUS
ALARM
1 2 3 4
Fig. 3.2.3 LED Display for the Printed Circuit Boards in the Control Unit
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