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1. Check the Fan is Rotating
Look at the fan on the rear panel. Check the fan is rotating.
If the fan is not rotating, continue with the
FIND OUT WHY THE FAN IS NOTROTATING
in
this chapter.
If the fan is rotating, continue with the next
Check the A50 SHUTDOWN LED.
2. Check the A50 SHUTDOWN LED
There is a LED, SHUTDOWN LED, on the A50 DC-DC Converter.Perform the following
procedure to check it. The SHUTDOWN LED is described in the next
A50 SHUTDOWN LED
.
a. Turn the analyzer power o.
b. Remove the analyzer's top cover and shield plate.
c. Turn the analyzer power on.
d. Look at the A50 SHUTDOWN LED. The LED is normally on. The SHUTDOWN LED location
on A50 DC-DC Converter is shown in Figure 7-2.
If the A50 SHUTDOWN LED is o, continue with the
FIND OUT WHY THE A50
SHUTDOWN LED IS OFF
in this chapter.
If the A50 SHUTDOWN LED is on, continue with the
Check the A1 +5 VD LED
in this
procedure.
Figure 7-2. A50 SHUTDOWN LED Location
A50 Shutdown LED
The A50 SHUTDOWN LED turning o indicates some of A50 power supply is shut down by the
A50 shutdown circuitry.
There are two FAN conditions, rotating and not rotating when the SHUTDOWN LED turns
o. When the fan is rotating, the shutdown circuit is probably activated by the over current
Power Supply Troubleshooting 7-3
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