Start Here - Agilent Technologies 8753ES Option 011 Service Manual

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Check the Green LED and Red LED on A15
Switch on the analyzer and look at the rear panel of the analyzer. Check the two power
supply diagnostic LEDs on the A15 preregulator casting by looking through the holes
located to the left of the line voltage selector switch. (See
During normal operation, the bottom (green) LED is on and the top (red) LED is off. If
these LEDs are normal, then A15 is 95% verified. Continue to "Check the Green LEDs on
A8".
• If the green LED is not on steadily, refer to
Steadily" on page
• If the red LED is on or flashing, refer to
Figure 5-2 Location of A15 Diagnostic LEDs
Check the Green LEDs on A8
Remove the top cover of the analyzer and locate the A8 post regulator; use the location
diagram under the top cover if necessary. Check to see if the green LEDs on the top edge of
A8 are all on. There are nine green LEDs (one is not visible without removing the PC board
stabilizer).
• If all of the green LEDs on the top edge of A8 are on, there is a 95% confidence level that
the power supply is verified. To confirm the last 5% uncertainty of the power supply,
refer to "Measure the Post Regulator Voltages,"
• If any LED on the A8 post regulator is off or flashing, refer to
A8 Are Not All ON" on page
Chapter 5
5-7.
5-13.
Figure
"If the Green LED of the A15 Is Not ON
"If the Red LED of the A15 Is ON" on page
next.
Power Supply Troubleshooting
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5-2.)
"If the Green LEDs of the
5-8.
5-5