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Computer System
Electrical
Troubleshooting Guide
IRB-6400 M94A
2.4.5 System Board DSQC 256A
Designation Color Description
Sensors 1-3 Yellow Lights when high signals are
received from sensors 1-3.
The LED shines more brightly
the more voltage is input. This
means that even if the input
voltage is just under the
voltage level “1”, the LED will
glow dimly.
F Red Turns OFF when the board
approves the initialization.
EN Green Turns ON to indicate computer
system is operating.
AS Yellow Turns ON when the Run Chain
1 circuits up to and including
the automatic mode safeguard
stop (AS) are closed.
MS Yellow Turns ON when the Run Chain
1 enabling device on the teach
pendant is pressed halfway
and the circuits up to and
including the manual mode
safeguard stop (MS) are
closed.
GS Yellow Turns ON when the Run Chain
1 circuits up to and including
the general mode safeguard
stop (GS) are closed.
ES Yellow Turns ON when the Run Chain
1 circuits up to and including
the emergency stop (ES) are
closed.
LIM Yellow Turns ON when all circuits
and limit switches are closed.
The left LED indicates the
status of Run chain 1 and the
right of Run chain 2.
ERR Red Turns ON when one, but not
the other KM1 or KM2 relay is
energized.
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