Digital Control
Observe the Power Up Sequence
Switch the analyzer power off, then on. The following should take place within
a few seconds:
n On the front panel, observe the following:
1. All six amber
LEDs
illuminate.
2. The port 2 LED
illuminates.
3. The amber
LEDs
go off after a few seconds, except the CH 1 LED. At the
same moment, the port 2 LED goes off and the port 1 LED
ilhnninates.
(See Figure 4-4.)
n
The display should come up bright with no irregularity in colors.
n After an initial pattern, five red
LEDs
on the
A9
CPU board should remain
off. They can be observed through a small opening in the rear panel.
If the power up sequence does not occur as described, or if there are
problems using the front panel keyboard, refer to Chapter 6, “Digital Control
Troubleshooting.
n
Figure 4-4. Front
Panel
Power Up Sequence
Start Troubleshooting Here
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