Service Guide N5227-90001 4-9
PNA Series Microwave Network Analyzers Troubleshooting
N5227A Power Up Troubleshooting
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 4-13.
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 Chapter 7 for
removal instructions).
1. Unplug the A23 test set motherboard ribbon cable from the A23 test set motherboard (refer to
“Removing and Replacing the A23 Test Set Motherboard” on page 7-22).
1. Unplug the A23 test set motherboard to A24 IF multiplexer board ribbon cable from the A24 IF
multiplexer board (refer to “Removing and Replacing the A24 IF Multiplexer Board” on page 7-24).
2. Unplug the front panel interface cable from the A1 front panel interface board (refer to “Removing the A1
Front Panel Interface Board and Keypad Assembly” on page 7-8).
3. Remove the A16 SPAM board (refer to “Removing and Replacing the A4–A17 Boards” on page 7-10).
4. Remove the A10 source board (refer to “Removing and Replacing the A4–A17 Boards” on page 7-10).
5. Remove the A5 source board, if present (refer to “Removing and Replacing the A4–A17 Boards” on
page 7-10).
6. Remove the A15 13.5 GHz synthesizer board (refer to “Removing and Replacing the A4–A17 Boards” on
Table 4-1 Power Supply Measurement Points
Te st P o int Supply Name
Expected
Level (Vdc)
Tes t Poin t Supply Name
Expected
Level (Vdc)
TP517 Analog Ground 0 V TP516 5.2 V analog 5.2 ±0.1
TP509 +15 V analog 15.0 ±0.1 TP514 7 V analog 7.0 ±0.1
TP511 +9 V analog .0 ±0.1 TP500 Digital Ground 0V
TP515 +3.3 V analog +3.3 ±0.1 TP502 +5.1 V standby +5.1 ±0.1
TP513 +5.2 V analog +5.2 ±0.1 TP503 +12 V digital +12.0 ±0.1
TP501 +15 V standby +15.0 ±0.1 TP507 +3.35 V digital +3.35 ±0.1
TP504 +32 V analog +32.0 ±0.1 TP505 +5.1 V digital +5.1 ±0.1
TP512 15 V analog 15.0 ±0.1 TP519 Digital Ground 0 V
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