4-12 Keysight N5224B/25B Service Guide
Troubleshooting
Power Up Troubleshooting
4-
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
If Any Supply Voltage Is Missing
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
for removal instructions).
If any one individual voltage supply from the A20 power supply develops
an over-voltage or over-current problem, all supplies are affected. The
cause of the over-voltage or over-current condition can be the A20 power
supply itself, or any assembly to which the A20 power supply provides
voltage. To isolate the cause, continue to the assembly removal process as
described in the section titled
“If Any Supply Voltage Is Missing” on
.
Table 4-1
Power Supply Measurement Points
Test Point
Supply Name
Expected Level
(Vdc)
Test Point
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
+9
.0 ±0.1
TP500
Digital Ground
0
V
TP515
+3.5 V analog
+3.5 ±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
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.
Содержание N5224B
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Страница 608: ...8 102 Keysight N5224B 25B Service Guide General Purpose Maintenance Procedures Correction Constants 8...
Страница 612: ...Appendix 4 Service Guide EEPROM Address Assignments and Location N5224 5A B PNA and N5244 5A B PNA X Instruments...
Страница 613: ...Installation Note Xxxxx xxxxx 3...