Power Supply
Check the Rear Panel
LEDs
Switch on the analyzer. Notice the condition of the two
LEDs
on the Al5
preregulator at rear of the analyzer. (See Figure 4-3.)
q
The upper (red) LED should be off.
q
The lower (green) LED should be on.
RED LED GREEN LED
NORMALLY OFF NORMALLY ON
i
I
UNE VOLTAGE
SELECTOR SWITCH
/
sg646e
Figure 43.
Al5
Preregulator
LEDs
Check the
A8
Post Regulator
LEDs
Remove the analyzer’s top cover. Switch on the power. Inspect the green
LEDs
along the top edge of the
A8
post-regulator assembly.
•I
Ail
green
LEDs
should be on.
q
The fan should be audible.
In case of difficulty, refer to Chapter 5, “Power Supply Troubleshooting.”
4-l
0
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