Specifications

Troubleshooting POST (Power-On Self Test) - 2
POST (Power-On Self Test)
When you switch on power, all the status panel LEDs illuminate
briefly. This confirms that power is getting to the status panel and
that all LEDs are operational. All LEDs then extinguish and come
back on. This marks the start of POST.
POST is a set of diagnostic procedures that are written into
firmware on the I/O controller board. POST executes in the first
10 seconds of startup and checks the following three areas of the
printer in order:
• Stage 1 I/O controller (ROM & SIMMs)
• Stage 2 I/O controller (miscellaneous circuitry)
• Stage 3 D/C controller board