4 Assembly Level Troubleshooting
136 Keysight 3458A Assembly-Level Repair Manual
Figure 4-3 Inguard power supply
8 If the power supply voltage is still low, locate the gray 20-pin cable that
connects the Inguard power Supply (A4) assembly to the AC Converter (A2)
assembly. Unplug the cable at the power supply assembly.
9 If the power supply voltage is now good, the AC Converter (A2) assembly is
defective. Go to the Assemblies Removal/Installation Procedures in Chapter 3
of this manual to replace the assembly.
10 If the power supply voltage is still low, locate the gray 20 pin cable that
connects the Inguard Power Supply (A4) assembly to the A/D Converter and
Inguard Logic (A3) assembly. Unplug the cable at the power supply assembly.
11 If the power supply voltage is now good, the A/D Converter and Inguard Logic
(A3) assembly is defective. Go to the Assemblies Removal/Installation
Procedures in Chapter 3 of this manual to replace the assembly.
12 If the power supply voltage is still low, the Inguard Power Supply (A4)
assembly is defective. Go to the Assemblies Removal/Installation Procedures
in Chapter 3 of this manual to replace the assembly.
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