Technical data

4–6 Troubleshooting
Troubleshooting Table
Use the troubleshooting checklist that begins on page 4–4 to find a symptom, then use
this table to verify and fix the problem.
Table 4–1 Troubleshooting Table
Symptom Possible Cause Investigation Remedy
Reset button not lit No power to
subsystem.
Check power to
subsystem and power
supplies on controller’s
shelf.
Replace cord or AC input
power module.
Ensure that all cooling
fans are installed. If one
or more fans are missing
or all are inoperative for
more than eight
minutes, the EMU shuts
down the subsystem.
Turn off power switch on
AC input power module.
Replace cooling fan.
Restore power to
subsystem.
Verify that the standby
power switch on the PVA
was not depressed for
more than five seconds.
Depress the alarm control
switch on the EMU.
Failed controller. If the foregoing check
fails to produce a
remedy, check for OCP
LED codes.
Replace controller.
Reset button lit
steadily; other LEDs
also lit.
Various See Operator Control
Panel LED Codes.
Follow repair action.