Troubleshooting
Getting Started with Troubleshooting
1-8
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.
(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 1-9.
Error Messages
If error messages are reported after the turn-on check is completed, refer to the Error Messages manual for
details.
Table 1-4 A18 CPU LED Sequence Table
Sequence DS1 DS2 DS3 DS4 DS5 DS6 DS7 DS8
1 XXXXXXXX
2 00X00000
3 XXX00000
4 0XXXXXXX
5 00000000
6 XXXXXXX0
700XX0X0X
After Preset 00000000
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