Check the Operating Temperature
The temperature sensing circuitry inside the
Al5
preregulator may be shutting
down the supply. Make sure the temperature of the open air operating
environment does not exceed 55
OC
(131
OF’),
and that the analyzer fan is
operating.
q
If the fan does not seem to be operating correctly, refer to “Pan
Troubleshooting” at the end of this procedure.
q
If there does not appear to be a temperature problem, it is likely that
Al5
is
faulty.
Inspect the Motherboard
If the red LED is still on after replacement or repair of
A15,
switch off the
analyzer and inspect the motherboard for solder bridges and other noticeable
defects. Use an ohmmeter to check for shorts The
+5
VD,
+5
VCPU, or
+5 VDSENSE lines may be bad. Refer to the block diagram
(Figure
5-8) at the
end of this chapter and troubleshoot these suspected power supply lines on the
Al7
motherboard.
Power Supply Troubleshooting 5-13
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