Diagnosing With The Leds - HP J4850A Installation And Getting Started Manual

Troubleshooting

Diagnosing with the LEDs

Diagnosing with the LEDs
Tables 4-1 shows LED patterns on the switch and the switch modules that
indicate problem conditions.
1.
2.
Table 4-1.
Off with
power cord
plugged in
On Prolonged
On
On Flashing
On Flashing
On Flashing
On Off
On Flashing
On Flashing
On Flashing
On Off
On Off
* This LED is not important for the diagnosis.
†
The flashing behavior is an on/off cycle once every 1.6 seconds, approximately.
††
The fast flashing behavior is an on/off cycle once every 0.8 seconds, approximately
4-4
Check in the table for the LED pattern you see on your switch
Refer to the corresponding diagnostic tip on the next few pages.
LED Error Indicators
LED Pattern Indicating Problems
* * *
Prolonged *
On
† †
Flashing Off
† †
Flashing Flashing
† †
Flashing Flashing
Off Flashing
† †
Flashing Flashing
†
Off *
†
Off *
Off Off
Off On
* *
* *
* *
†
* *
†
* *
†
* *
†
* *
†
Flashing *
†
* Flashing
* *
* *
Diagnostic
Tips
➊
*
➋
*
➌
*
➍
Never On
➎
On briefly,
then Off
➏
*
†
➐
Flashing
➑
*
➒
*
➓
Fast
††
Flashing
l
Off with cable
connected