FIND OUT WHY THE A50 SHUTDOWN LED IS OFF
Use this procedure when the fan is rotating. If the fan is not rotating, see the
FIND OUT WHY
THE FAN IS NOTROTATING
.
If the fan is rotating and the A50 SHUTDOWN LED is o, the problem may be in the A50
DC-DC Converter and any of assemblies obtaining the power from +5 VD supply and the
higher power supplies.
1. Disconnect the Cable from the A1J10
Turn the analyzer power o. Disconnect the cable from A1J10. Turn the analyzer power on.
If the A50 SHUTDOWN LED goes on, replace the A1 CPU.
If the A50 SHUTDOWN LED is still o, the A1 CPU is veried. Turn the analyzer power o
and reconnect the cable to the A1J10. Continue with the next
Remove Assemblies
.
2. Remove Assemblies
a. Turn the analyzer power o.
b. Remove the assemblies, A2, A3, A5, A7, A8 and A51.
c. Turn the analyzer power on.
If the A50 SHUTDOWN LED is still o, inspect the A20 motherboard for soldering bridges
and shorted traces on the FAN POWER and the FAN LOCK signal paths.
If the A50 SHUTDOWN LED goes on, the A20 motherboard are veried. Continue with
the next step.
d. Reinstall each assembly one at a time. Turn the analyzer power on after each is installed.
The assembly that causes the A50 SHUTDOWN LED to go o is the most probable faulty
assembly. Replace the assembly. If no assembly makes the A50 SHUTDOWN LED o,
continue with the next
Disconnect the Cable from the A9J2
.
3. Disconnect the Cable from the A9J2
Turn the analyzer power o and reinstall all of assemblies
. Disconnect the cable from the A9J2
and turn the analyzer power on. The location of the A9J2 is shown in the Figure 7-5.
If the A50 SHUTDOWN LED goes o, the A9 is faulty. Replace the A9 assembly.
7-6 Power Supply Troubleshooting
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