4-12 Chapter 4
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Digital Control
Digital Control
Observe the Power Up Sequence
Switch the analyzer power off, then on. The following should take place within a few
seconds:
• On the front panel, observe the following:
1. All eight amber LEDs illuminate.
2. 8753ES Only: the Port 2 LED illuminates.
3. The amber LEDs go off after a few seconds, except the Chan 1 LED.
8753ES Only: the Port 2 LED goes off and the Port 1 LED illuminates. (See Figure
4-4.)
• The display should come up bright with no irregularity in colors.
• 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 keys, refer to Chapter 6 , “Digital Control Troubleshooting.”
Figure 4-4 Front Panel Power Up Sequence
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