How to determine the cause
LED on controller board (PCB15) blinks once every second
LED on controller board (PCB15) blinks once every second
LED on Controller board (PCB15) does not blink
[A]: LEDs on the controller board (PCB15)
Check the condition (lit, off, blinking) of the LED on the controller board (PCB15).
Normal situation: POSTCODE LED 8 [A] and BIOS LED [B] blinking once every second.
For CPU
• POSTCODE 8 and BIOS LED blink when the CPU is operating normally.
• POSTCODE 8 and BIOS LED are lit or off when there is a problem with the CPU.
Confirmation procedure:
1. Remove the FCU unit. (Refer to FAX unit FSM.)
2. Remove the I/F slot.
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