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Service Guide E8364-90026
4-7
PNA Series Microwave Network Analyzers
Troubleshooting
E8362B, E8363B, E8364B
Power Up Troubleshooting
Power Supply Check
NOTE
There are no fuses to replace within the power supply. If you determine that
the power supply is the failed assembly, replace the power supply.
A catastrophic failure in the power supply can be determined by observing the line switch,
and by measuring the probe power at the front-panel Probe Power connectors:
1. Ensure that the instrument is plugged in with the power switch in the standby
position (power not switched on). Verify that the line switch glows yellow. A line
switch that glows yellow indicates that the +15 VDC line (P15 STB) is providing
enough voltage to light the LED. (The actual voltage may not be +15 VDC.)
2. Turn on the instrument power and verify that the line switch glows. When the line
switch glows, it is an indication that the power supply has received an “ON”
command and that the +5.2 VDC supply can supply enough current to light, at least,
these lamps.
3. The front-panel probe power-connector can be used to check the +15 VDC and
−
12.5 VDC (
−
15 VDC) supplies. The
−
12.5 VDC is produced by post regulating the
−
15 VDC supply. Refer to
for a diagram of the probe power connector.
Figure 4-2 Probe Power Connector
If all of these supply voltages are missing, it is likely that the problem is either a defective
A4 power supply, or another assembly is loading down the A4 power supply. Continue with
“If All Supply Voltages Are Missing” on page 4-10
, to determine the cause of the problem.
If the line switch is lit correctly, and the probe power voltages measure within the
specifications listed in
, the power supply has not suffered a
catastrophic failure; however, the power supply could still be at fault. Continue with the
next section to measure the individual voltage supplies.
sa869a
PROBE POWER
-12.6 V
+15 V
Содержание E8362B
Страница 11: ...Service Guide E8364 90026 1 1 1 Safety and Regulatory Information ...
Страница 19: ...Service Guide E8364 90026 2 1 2 General Product Information ...
Страница 33: ...Service Guide E8364 90026 3 1 3 Tests and Adjustments ...
Страница 83: ...Service Guide E8364 90026 4 1 4 Troubleshooting ...
Страница 151: ...Service Guide E8364 90026 5 1 5 Theory of Operation ...
Страница 185: ...Service Guide E8364 90026 6 1 6 Replaceable Parts ...
Страница 269: ...Service Guide E8364 90026 7 1 7 Repair and Replacement Procedures ...
Страница 351: ...Service Guide E8364 90026 8 1 8 General Purpose Maintenance Procedures ...