North Star DIMENSION Service Manual page 208

TROUBLESHOOTING
System Troubleshooting
Preliminary
The primary tool you must use during system
Observations
troubleshooting is observation. You must look at
and Actions
the central module and workstations when power is
first turned-on and make sure the following occur:
1. The main power LED on the central module turns
on and stays on.
If the main power LED turns off, it may be an
indication of a failure of the central PCB. If
the LED turns off:
o Verify power supply voltages. See the
section on checking and adjusting the power
supply.
o Use Service Diskette #1 to check the central
PCB.
o Replace the central PCB.
2. The operating system boots from the diskette
drive or fixed disk drive.
If you are booting from the diskette drive and
you observe that both the main power LED and
diskette drive LED turn off after an attempted
boot, it may be an indication that you are
attempting to boot from the wrong type of
diskette. It may also be an indication that
there has been a failure of the diskette drive.
If you are booting from a fixed disk and
observe that the central module main power LED
turns off after an attempted boot, it may be an
indication of a failure of the fixed disk drive
or damage to the data written on the fixed
disk. In this case:
o Use another boot diskette.
o Verify DC power to the disk drive.
o Use Service Diskette #2 to check the diskette
and fixed disk drives.
5-2 Technical Manual