M3SR Series 4100 Control Unit Maintenance
3.102 Operating Manual 6175.4760.02 – 01
Start the initiated built-in test of the control unit.
Several tests are performed during initiated built-in
test (see sect. 6.2.5 Control Unit Built-In Test). During
IBIT also the CU LEDs flash for a short time. To make
sure that the four LEDs are working properly, observe
the LEDs during IBIT. If during IBIT an error occurs, the
IBIT status displayed in the central area of this menu
changes to 'ERROR'. To get more information about
the detected error press softkey 'Error...' to navigate to
menu Control Unit Error List (see ”Control Unit Error
List (4011)” on p. 3.103).
Navigate to the menu CU MTC 2/4 (see sect. 3.5.2 Control
Unit MTC 2/4 (4002)).
Softkey Description Possible Values
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