Agilent Technologies PNA Series Service Manual page 94

Troubleshooting
Power Up Troubleshooting
6. Connect the display ribbon cable and display lamp cable from A2 to A3. Connect the
front panel interface ribbon cable coming from the analyzer to the A3 board.
7. Turn the analyzer on and refer to
"Verifying the A3 Front Panel Interface Board" on page 4-16
the boards.
Verifying the Inverter Board
WARNING High voltage is present on the inverter board and the A3 front panel
interface board. Be careful when measuring signals and voltages on
these boards.
To access the front panel boards for measurements, it is necessary to remove
NOTE
the front panel assembly. Refer to
Assembly" on page
Using Figure 4-5 as a reference, measure the signals and voltages indicated in
page 4-14. If the signals and voltages measure good, the inverter board is functioning
correctly.
Figure 4-5 Inverter Board Test Point Locations
Table 4-3 Inverter Board, Voltages and Signals
Test Point
CN1 pin 1
CN1 pin 2
CN1 pin 3
CN1 pin 4
After measuring the points CN1 and CN2, match the results and perform the rework as
indicated in the action column in
4-14
"Verifying the Inverter Board" on page 4-14
7-10.
Signal or Voltage
+5.1 Vdc
+5.1 Vdc
39 mV
0 V (ground)
Table 4-4.
PNA Series Microwave Network Analyzers
to test and troubleshoot
"Removing and Replacing the Front Panel
Test Point Signal or Voltage
CN1 pin 5
CN1 pin 6
+400 V peak sinewave
CN2 pin 1
CN2 pin 5
Service Guide E8361-90001
E8361A
and
Table 4-3 on
0 V (ground)
+2.54 V
@ 38 kHz
ac neutral
(referenced to pin 1)