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HP 8517B S-Parameter Test Set Manual
5-9
Troubleshooting the Test Set
Troubleshooting Procedures
Figure 5-4 Instrument HP-IB Switch Setting
Fuse Location The fuse is located inside the line module at the rear panel of the test set. The
value rating and part number of the fuse is listed in Chapter 7, “Replaceable
Parts” of this manual. Review the information in Figure 5-5 to replace the
line fuse or to set the voltage selector cam.
Figure 5-5 Fuse and Voltage Cam Location
Self-Test Indicators If the front-panel ACTIVE LED (shown in Figure 5-6) fails to light within
five seconds after turning the power on, or if it lights immediately, the
instrument has failed self-test.
To determine the portion of the self-test that failed, note which LEDs on A4
board assembly are turned on. Figure 5-7 shows the location of the LEDs.
See Table 5-4 for the condition description of the LED status indicators.