Installation guide

Troubleshooting
Getting Started with Troubleshooting
1-7
Verifying the A12 CPU Power-On Sequence
1. Before verifying the power-on sequence, ensure that all eight DIP switches of S1 are in the CLOSED (up)
position. (Refer to Figure 1-2 and locate S1 in the upper left-hand corner of the A12 CPU.)
2. Verify the A12 CPU power-on sequence by observing DS1 through DS8.
When the power-on sequence is complete, DS1 through DS7 should be on and DS8 should be off.
• If the lights fail to step through the sequence, replace A12 CPU.
(Refer to “A12 CPU” on page 2-30.)
Figure 1-2 S1 and LEDs DS1 through DS8 and DS11 through DS17 of the A12 CPU
Verifying the A5 10 GB Hard Drive (Option 005)
At power on, the hard drive’s file structure is verified.
• If the hard drive is not formatted, the A12 CPU formats it.
• If the file structure is corrupted, the A12 CPU recreates the structure; this may take up to 30 seconds
during the power-on sequence.
• If the power-on sequence does not complete, perform the following:
a. Turn power off to the signal generator.
b. Disconnect the hard drive’s W26 ribbon cable from P3 of the A12 CPU.
c. Turn power on to the signal generator.
— If the power-on sequence does not complete,
refer to A12 CPU Fails to Complete the Power-On Check on page 1-5.
— If the power-on sequence does complete, either the A5 10 GB Hard Drive (Option 005) or the A12
CPU hard drive interface is bad; these can be isolated by substitution.