When The Mode Led Does Not Turn On - Mitsubishi Electric Q26UD(E)HCPU User Manual

15.1.4

When the MODE LED does not turn on

Check the following items.
The forced ON/OFF is set.
When the High Performance model QCPU, Process CPU, or
Redundant CPU are used, RESET/L.CLR switch is not in the
neutral position.
The MODE LED turns on when power is supplied to the
system again after the power supply module was replaced.
The MODE LED does not turn on even when power is
supplied to the system again after the power supply module
was replaced.
The POWER LED turns on when power is supplied again to
the system after all modules, except for the power supply
module, were removed.
The connection direction of the extension cable is improper.
(The connection direction is OUT-OUT.)
AC power is not supplied to the power supply module.
For the module that caused a problem, please consult your local Mitsubishi service representative.
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Check item Corrective action
Cancel the forced ON/OFF.
Set the RESET/L.CLR switch to the neutral position.
The original power supply module has a problem.
Please consult your local Mitsubishi representative.
The CPU module or any other module mounted has a
problem.
Repeatedly supply power to the system, returning the
modules back to the system one by one.
The last module mounted immediately before the MODE
LED turned off is failed.
Repeatedly supply power to the system, returning the
modules back to the system one by one.
The last module mounted immediately before the POWER
LED turned off fails.
Connect the extension cable properly.
Supply AC power to the power supply module.