If the Red LED of the
Al5
Is ON
If the red LED is on or flashing, the power supply is shutting down. Use the
following procedures to determine which assembly is causing the problem.
Check the A8 Post Regulator
1. Switch off the analyzer.
2. Disconnect the cable
A15Wl
from the
A8
post regulator. (See Figure 5-5.)
3. Switch on the analyzer and observe the red LED on
A15.
q If the red LED goes out, the problem is probably the
A8
post regulator.
Continue to “Verify the
Al5
Preregulator” to first verify that the inputs to
A8
are correct.
q If the red LED is still on, the problem is probably the Al5 preregulator, or
one of the assemblies obtaining power from it. Continue with “Check for a
Faulty Assembly”.
5-8 Power
Supply Troubleshooting
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