Agilent N5161A/62A/81A/82A/83A MXG Signal Generators Service Guide
Troubleshooting
The Green Front Panel Power Switch LED or Yellow Standby LED is Not Working
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The Green Front Panel Power Switch LED or Yellow Standby LED is Not Working
The power switch and standby LEDs are controlled by the +5.1 Vdc standby line. The +5.1 Vdc standby line is supplied by the A1 Power
Supply and is routed through the A3 RF assembly to the front panel.
With the signal generator plugged in and the power turned off, the yellow standby LED should be on. When the signal generator is turned on,
the yellow standby LED should turn off and the green front panel power switch LED should turn on. If either of these LEDs are not
functioning as expected, complete the following procedure to correct the problem.
1. Remove the outer and inner instrument covers. Refer to Chapter 3, "Assembly Replacement" for instructions on removing the
instrument covers.
2. Using Figure 1-24, check the green DS3 LED on the A3 RF assembly.
• If DS3 is on, continue to step 3.
• If DS3 is off, go to step 4.
3. Using Figure 1-24, press line switch S1 on the A3 RF assembly.
Figure 1-24 Line Switch
a. Using Figure 1-25, verify that the following power supply voltage LEDs are on.
• +3.3VDF, DS1
• +5VDF, DS2
• +5.1VSBF, DS3
• +12VDF, DS4
• +32VAF, DS5
• +5VAF, DS6
• +9VAF, DS7
• +15VAF, DS8
• -7VAF, DS9
• -15VAF, DS10
DS3
S1
Front Panel
Rear Panel
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