L
CPU
LED
WlNDOW
sg651e
Figure 6-3. CPU LED Window on Rear Panel
2. Cycle the power while observing all eight red LEDs
With the analyzer positioned bottom up, cycle the power and observe the
eight red
LEDs
while looking from the front of the instrument.
Note
If
Grmware
did not load, a red LED on the CPU board will be
flashing. Refer to “Loading Firmware” in Chapter 3.
3.
Evaluate
results
q
If either of the following LED patterns remain, go to “Display
Troubleshooting.
n
0
0 0
0
0
0
0 0
l l
a 0
0
l
0
a
(front of instrument 4)
q
If any other LED patterns remain, replace the
A9
CPU after verifying the
power supply.
6-6 Digital Control Troubleshooting
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