Assembly Level Troubleshooting 4
Keysight 3458A Assembly-Level Repair Manual 133
Power Supplies Troubleshooting
Before troubleshooting the power supplies, do the following:
1 Make sure the power line voltage select switches are in the correct position.
Also make sure the correct power fuse is installed and that the fuse is good.
Refer to Chapter 2, Table 2-1 for the correct switch positions and fuses.
Figure 4-2 Outguard power supply
2 If the switch positions are correct and the fuse is good, go to the appropriate
procedures to troubleshoot the suspect power supply.
3 If the ac power fuse is blown, try replacing the fuse first. If the fuse still blows,
do the following:
a Use the Covers Removal/Installation Procedures in Chapter 3 of this
manual to remove the instrument's top/bottom cover and bottom shield.
b Refer to Figure 4-2 to locate the 8-pin cable that connects the Outguard
Power Supply (A6) assembly to the power transformer. Unplug the cable at
the power supply assembly.
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