Controller Self-Diagnostics
SM 5-21 D037/D038/D040/D041
System
Maintenance
Reference
5.5 CONTROLLER SELF-DIAGNOSTICS
5.5.1 OVERVIEW
There are three types of self-diagnostics for the controller.
1. Power-on self-diagnostics: The machine automatically starts the self-diagnostics just
after the power has been turned on.
2. SC detection: The machine automatically detects SC conditions at power-on or during
operation.
The following shows the workflow of the power-on and detailed self-diagnostics.