Keysight N5221A Service Manual page 87

PNA Series Microwave Network Analyzers
N5221A/22A
Table 4-1 Power Supply Measurement Points
Test Point Supply Name
TP517 Analog Ground
TP509 +15 V analog
TP511 +9 V analog
TP515 +3.3 V analog
TP513 +5.2 V analog
TP501 +15 V standby
TP504 +32 V analog
15 V analog
TP512
If All Supply Voltages are Present
If all of the supplies have measured within tolerances, and the instrument still is not functioning properly,
refer to "Front Panel Troubleshooting" on page
If Any Supply Voltage Is Missing
WARNING Disconnect the line-power cord before removing any assembly. Procedures described in
this document may be performed with power supplied to the product while protective
covers are removed. Energy available at many points may, if contacted, result in personal
injury or loss of life.
You must sequentially remove all of the assemblies, taking care to disconnect the line power cord before
each removal, and then measure the supply voltages after each removal.
If the missing supply voltages return to a "power on" condition after removal of an assembly, suspect that
assembly as being defective.
Remove the network analyzer assemblies in the order specified in the following steps (refer to
removal instructions).
1. Unplug the A19 test set motherboard ribbon cable from the A19 test set motherboard (refer to
"Removing and Replacing the A19 Test Set Motherboard" on page
1. Unplug the A19 test set motherboard to A20 IF multiplexer board ribbon cable from the A20 IF
multiplexer board (refer to
2. Unplug the front panel interface cable from the A1 front panel interface board (refer to
Front Panel Interface Board and Keypad Assembly" on page
3. Remove the A12 SPAM board (refer to
4. Remove the A8 source board (refer to
5. Remove the A5 source board, if present (refer to
page 7-14).
6. Remove the A11 13.5 GHz synthesizer board (refer to
Service Guide N5222-90001
Expected
Level (Vdc)
0 V
15.0 ±0.1
.0 ±0.1
+3.3 ±0.1
+5.2 ±0.1
+15.0 ±0.1
+32.0 ±0.1
15.0 ±0.1
4-13.
"Removing and Replacing the A20 IF Multiplexer Board" on page
"Removing and Replacing the A4–A13 Boards" on page
"Removing and Replacing the A4–A13 Boards" on page
"Removing and Replacing the A4–A13 Boards" on
Test Point Supply Name
5.2 V analog
TP516
7 V analog
TP514
TP500 Digital Ground
TP502 +5.1 V standby
TP503 +12 V digital
TP507 +3.35 V digital
TP505 +5.1 V digital
TP519 Digital Ground
7-26).
7-10).
"Removing and Replacing the A4–A13 Boards" on
Troubleshooting
Power Up Troubleshooting
Expected
Level (Vdc)
5.2 ±0.1
7.0 ±0.1
V
+5.1 ±0.1
+12.0 ±0.1
+3.35 ±0.1
+5.1 ±0.1
0 V
Chapter 7 for
7-28).
"Removing the A1
7-14).
7-14).
4-9