Keysight 9000 Series Service Manual page 62

Chapter 4: Troubleshooting
How to Use the Power Fault LEDs
group. Remember these are the LEDs that specify the type of failure that occurred. The fault types are
described below the table.
Fault Type LED1
Sequence On
Reset On
Command Off
External Off
The following table then shows how to decode the bottom two LEDs in each group (LEDs 3 and 4).
Remember that these LEDs specify the source of the failure.
Fault Source LED3
1 On
2 On
3 Off
4 Off
The fault source refers to the input channel of the corresponding sequencer. Below is a listing of the
inputs for each sequencer.
Sequencer 1
Input Supply
1 +12V Bulk
2 +5 V
3 +3.3 V
4 +2.5 V
Sequencer 2
Input Supply
1 +1.8V
2 +2.25 V
3 +1.6 V
4 +1.2 V
62
LED2
On
Off
On
Off
LED4
On
Off
On
Off