Service Guide E8364-90001
4- 7
PNA Series Microwave Network Analyzers
Troubleshooting
E8362A, E8363A, E8364A
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
Summary of Contents for E8362A
Page 11: ...Service Guide E8364 90001 1 1 1 Safety and Regulatory Information ...
Page 19: ...Service Guide E8364 90001 2 1 2 General Product Information ...
Page 29: ...Service Guide E8364 90001 3 1 3 Tests and Adjustments ...
Page 79: ...Service Guide E8364 90001 4 1 4 Troubleshooting ...
Page 139: ...Service Guide E8364 90001 5 1 5 Theory of Operation ...
Page 169: ...Service Guide E8364 90001 6 1 6 Replaceable Parts ...
Page 215: ...Service Guide E8364 90001 7 1 7 Repair and Replacement Procedures ...
Page 287: ...Service Guide E8364 90001 A 1 A Error Terms ...
Page 303: ...Service Guide E8364 90001 B 1 B Option Enable Utility ...
Page 309: ...Service Guide E8364 90001 C 1 C Firmware Upgrades ...
Page 313: ...Service Guide E8364 90001 D 1 D Operating System Recovery ...