Agilent Technologies 3458A Repair Manual page 86

86 Chapter 4 Assembly Level Troubleshooting
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.