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Figure 6
7
U3022AM06
Troubleshooting the Test Set
DC Power Status LEDs
5.
Front Panel R and S indicator LED Check. If none are on, remove the Switch
Driver board and recheck. If still no indication, replace the Controller board.
6.
Control Lines are not working.
a.
Verify that the control voltage pin connections to the DUT control lines are
connected properly. Refer to
b.
Verify that the rear panel DC voltage control adjustment can be set to 5 Vdc.
d. If the DC Indicator LEDs are not on, suspect the main power supply module or front
panel switch. The power supply (0950-4729) terminal connections should also be
verified with a DVM. Verify the voltages on the power supply label.
e. If the rear panel or deck fans is not operating and the DC Indicator LEDs are on,
replace the fan.
Keysight U3022AM06 User's and Service Guide
83