Keysight U3045AM04 User’s and Service Guide
61
U3045AM04
Service Information
b.
Set the standby switch to the On position. The rear panel and
internal power supply fans should be operational. The Active LED
will be On when the test set is connected to an active network
analyzer and is addressed by the network analyzer
c.
Verify that the DC LEDs indicators are On.
Note: The LEDs only indicate the presence of a DC voltage, not the
DC voltage level. Use the indicated wire locations for voltage
measurements, TP1 is your common. Refer to
d.
If there is no DC power, suspect the power supply module. The
actual power supply terminal connection should also be confirmed
with a DVM by removing the bottom cover and using the power
supply label to identify the terminal voltage values.
e.
If all of the DC Input LEDs are On and the fan is not working, replace
fan.
The +9 and –10 Vdc indicators are not used in this instrument (Off is normal).
Figure 44
DC Power Status LEDs
4.
Front panel R and S indicator LED check.
a.
If the indicators are not operating, continue to
Confirm that the analyzer and test set are properly
connected using the test set I/O cable (N4011-21002). See Figure
551), verify that the analyzer’s firmware is correct, and that
set file is loaded into the analyzer. Refer to
Switch
Driver Bd.
+5v
+28v
+3v
-15v
-12v
+15v
+12v
-10v
+9v
Test Set Controller Bd.
Instrument Rear Panel
DC Inputs
(from PS)
= LED INDICATOR
Controller Status LEDs
J20
J23
J40
J43
J10
J13
J30
J33
sw10
sw13
sw30
sw33
sw20
sw40
sw23
sw43
GND
TP1
+5v
+28v
+3v
-15v
-12v
+15v
+12v
+28v