Mitsubishi Electric Q26UD(E)HCPU - When the RUN LED Does Not Turn on; When the BOOT LED Flickers

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CHAPTER 15 TROUBLESHOOTING
15
15.1 Visual Inspection 15.1.5 When the RUN LED does not turn on
15.1.5 When the RUN LED does not turn on
Check the following items.
15.1.6 When the BOOT LED flickers
Turn off the programmable controller and remove the memory card. Turn the DIP switches SW2 and SW3 to ON.
When the BOOT LED turns on after power is resupplied, boot operation from the standard ROM starts.
If the BOOT LED does not turn on, the possible cause is the hardware failure of the CPU module.
Please consult your local Mitsubishi representative.
Check item Corrective action
The RUN LED of the CPU module flickers. Reset the CPU module or set it to RUN from STOP.
The ERR. LED of the CPU module is on or flickering.
Check the error details by the programming tool.
(
Page 282, Section 15.2)
The RUN LED turns on when the CPU module is reset and
set to RUN again.
The module is possibly affected by excessive noise. Take
noise reduction measures. (
Page 651, Appendix 8)
If the same problem frequently occurs even after the noise
reduction measures are taken, the programmable controller
possibly has any defective part or poor connection.
Please consult your local Mitsubishi representative.