User’s and Service Guide U3047-90001
61
U3047AM12
Service Information
5. 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. Refer to Figure 3 on
page 10.
c. Remove the instrument top cover. Using a DVM, verify that the three DC voltage inputs are present
on the DUT control board (E5091-66503). Refer to
.
d. If the DC voltages are normal, then replace the DUT control board. If the voltages are not present,
check the ribbon cable and its connections at both ends. Suspect the test set Control board as the
possible problem.
Figure 49
DUT Control Board DC Voltage Locations
E5091-66503
L3
L1
L2
+5
Vdc
+15
Vdc
-15
Vdc
TP1
GND
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