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Appendix A, Diagnostics Menus, fully describes the 373XXA Di
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agnostics menu tree, including the SERVICE LOG menu.
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Appendix B, Error Codes and Messages, for details on each of the
373XXA hardware related error messages.
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Chapter 6, System Description, for a brief technical description of
the 373XXA VNA system operation.
5-3 RECOMMENDED TEST
EQUIPMENT
The recommended test equipment for the troubleshooting procedures pre
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sented in this chapter is listed in Chapter 1, Table 1-1 (page 1-9).
5-4 SYSTEM DOES NOT
POWER-UP
If the 373XXA does not power-up when connected to a source of AC power
and the Power key is pressed, perform the power supply checks described
below.
WARNING
Hazardous voltages are present inside the instrument
when ac line power is connected. Turn off the instrument
and remove the line cord before removing any covers or
panels. Trouble shooting or repair procedures should only
be performed by service personnel who are fully aware of
the potential hazards.
Line Source and
Interface Checks
Check as follows:
Step 1. Verify that the AC power source is providing stable power
at the correct line voltage.
NOTE
The 373XXA is designed to automatically
sense and operate with AC power line volt
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ages in the range of 85 - 240 VAC, with a
frequency of 48 - 63 Hz (540 VA maximum).
Step 2. Verify that the power input cord is in good condition.
Step 3. ensure that the system power line fuse is installed, that it
is not open, and that it is the correct value (8 A, Slow
Blow).
Power Supply
Voltages Check
Verify that the 373XXA power supply voltages are correct as follows:
Step 1.
Press the 373XXA Power key off, and and disconnect the
power input cord from the 373XXA. ensure all external con
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nections to the system front and rear panel are also discon
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nected.
RECOMMENDED TEST EQUIPMENT TROUBLESHOOTING
5-4 373XXA MM