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Initial Troubleshooting and RF Block Diagrams ESG Family Signal Generators
Initial Troubleshooting
1-12 Service Guide
Initial Troubleshooting
Perform the following troubleshooting steps in the order they are presented. If you are
unable to identify the failed assembly, go to Chapter 2, “Assembly-Level Troubleshooting
with Block Diagrams,” for further instruction.
NOTE Do not attempt to replace any fuses within the power supply to correct a
problem with your signal generator. If you determine that the power supply is
the failed assembly, replace the power supply.
Step 1: Observe the Front and Rear Panel LEDs
Observing the LEDs on the front and rear panel of the signal generator will determine if
there is a catastrophic failure in the power supply assembly.
1. Ensure the signal generator is plugged in (do not switch the power on) and verify that
the yellow LED on both the front and rear panels is lit. Refer to Figure 1-1 for LED
locations. A lit yellow LED (+15 V_STBY) indicates that line voltage is present.
2. Power on the signal generator and verify that the green LED on both the front and rear
panels is lit. A lit green LED indicates the power supply has received an “ON”
command. The ON/OFF switch toggles a flip-flop latch which biases the proper
transistors in the LED control circuit. This circuit is powered by VBAT, the
battery-backed SRAM supply, so that the on-off state is “remembered” even when the
instrument is unplugged.
Figure 1-1 LED Locations on the Front and Rear Panels