Keysight Infiniium DSOS054A - Page 60

60 S-Series Oscilloscopes Service Guide
4 Troubleshooting
The fault source refers to the input channel of the corresponding sequencer. Below
is a listing of the inputs for each sequencer.
Fault Source LED3 LED4
1ONON
2ONOFF
3OFFON
4OFFOFF
Sequencer 1
Input Supply
1 +12 V Bulk
2+5 V
3 +3.3 V
4+5 V
Sequencer 2
Input Supply
1 +3.3 V Bulk
2 +2.5 V
3 +1.8 V
4 +1.8 V
Sequencer 3
Input Supply
1 +1.2 V
2 +1.3 V
3 +1.1 V
4 +0.9 V
Sequencer 4
Input Supply
1 +5.5 V
2-12 V Bulk
3 -5.3 V
4 -1.1 V