U3022AM42
Troubleshooting the Test Set
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 rear panel fan is not operating and the DC Indicator LEDs are
on
, replace the fan.
Figure
5
3
Test Set Diagram
6.
Front Panel R and S Indicator LED Check.
a.
Verify the test set Controller board Controller Status LEDs, shown in
.
b.
If none are on remove the Switch Driver board and recheck, if still no indication, replace
the Controller board.
c.
If the Controller Status LEDs are
on
and the front panel Active LED is
on
, suspect the front
panel LED boards or the ribbon cables. Replace as needed.
7.
Control Lines are not working.
a.
Verify that the control voltage pin connections to the DUT control lines are connected
properly. Refer to
“Address and Data Values” on page 45
b.
Verify that the rear panel DC voltage control adjustment can be set to 5 Vdc. Refer to
Keysight U3022AM42 User's and Service Guide
71
