Service manual

Troubleshooting with LEDs 2-3
Six status indicator LEDs (see Figure 2-1) show the state of the system. Table
2-1 describes the conditions indicated by the lights.
NOTE: With the keyswitch in the On position, if all six LEDs are blinking, one
or more of the power supplies has failed or there is a missing power
supply. With the keyswitch in the Off position, the LEDs will also blink
but do not provide power supply status.
Table 2–2 Operator Control Panel LEDs at Power-Up
Action
Keyswitch
On; On/Off
Button On Run Power Fault On Secure Reset
Set circuit
breaker to On
Off Blink Blink Blink Blink Blink Blink
Turn
keyswitch to
On and press
On button
On Off On Blink On Off Off
System self-
test starts
On Off On On On Off Off
Module
passes self-
test
On Off On Off On Off Off
Module fails
self-test
On Off On On On Off Off
Power supply
problem
On Blink Blink Blink Blink Blink Blink
Operating
system boots
On On On Off On Off Off