Agilent Technologies PSG Series Service Manual page 21

Troubleshooting
Getting Started with Troubleshooting
Verifying the A18 CPU Turn-On Sequence
Verify the A18 CPU turn-on sequence by observing DS1 to DS8 (located along the top) sequence patterns. DS1
to DS8 should match the sequence shown in Table1-4. Before verifying the turn-on sequence, make sure all
switches in the upper left-hand corner of the A18 CPU are in the CLOSED (up) position. If the lights fail to
step through the sequence, replace A18 CPU.
Table 1-4 A18 CPU LED Sequence Table
Sequence
(X) indicates LED is ON, (0) indicates LED is OFF
No Instrument Control From the Front Panel
Refer to "ILT4 Front Panel Display Troubleshooting" on page
Error Messages
If error messages are reported after the turn-on check is completed, refer to the Error Messages manual for
details.
1-8
DS1 DS2
1 X
2 0
3 X
4 0
5 0
6 X
7 0
After Preset 0
DS3 DS4
X X X
0 X 0
X X 0
X X X
0 0 0
X X X
0 X X
0 0 0
1-9.
DS5 DS6 DS7
X X X
0 0 0
0 0 0
X X X
0 0 0
X X X
0 X 0
0 0 0
DS8
X
0
0
X
0
0
X
0