Chapter 4 Assembly Level Troubleshooting 83
Figure 29. 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 29 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.
c. Locate the 5-pin cable that connects the Inguard Power Supply
(A4) assembly to the power transformer. Unplug the cable at the
power supply assembly.
d. Replace the ac power fuse with a new one. Apply AC power to the
3458A and turn it on.
e. If the fuse still blows, replace the power transformer.
f. If the fuse remains good, either the Outguard Power Supply (A6) or
the Inguard Power Supply (A4) is defective. Continue with the
next step.
g. Turn the instrument off. Locate the 5-pin cable connected to the
power transformer. Line up the cable with the socket on the
Inguard Power Supply (A4) assembly. Then plug it in.
To Next Page
Loading...
Need help?
General
