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8.1 Troubleshooting Flow
8.1.2 When the CPU Module "BACKUP" LED is ON (Red)
8
TROUBLESHOOTING
* 1: The control system, of which CPU module has been replaced, might start up as the standby
system.
Make sure to check the control system BACKUP LED after replacing the CPU module.
* 2: When using the CPU module whose first 5 digits of serial No. is "09012" or later, refer to Sections
8.1.9 and 8.1.10 for the description of error detected by the standby system.
Diagram 8.4 Flow for the Case where the CPU Module BACKUP LED is ON (Lit Red)
NO
Clear the control system CPU
module errors. ( )
Please contact the nearest
Mitsubishi represenative, reseller or
branch office and explain the fault
symptoms.
Replace control system's CPU
module.*1
( )
YES
Is the "BACKUP"
LED lit up solid
green?
2) 3)
Completed
Section 8.2
Section 8.3
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