4-12
Service Guide E8364-90026
Troubleshooting
PNA Series Microwave Network Analyzers
Power Up Troubleshooting
E8362B, E8363B, E8364B
If the Fans Are Not Operating
CAUTION
The power supply may be in thermal shutdown if the instrument has been
operating without the fans running. Allow the instrument to cool down before
troubleshooting.
If all three fans are not operating, suspect a power supply problem or a defective A14
system motherboard. Refer to
“Power Supply Check” on page 4-7
to check the individual
supplies. If the supplies are within specifications, the most probable cause is a defective
A14 system motherboard. Refer to
“Removing and Replacing the A14 System
.
If only one or two fans are not functioning, and the power supplies are within
specifications, suspect the A14 system motherboard or a defective fan. Perform the
following procedure.
1. Remove the front panel assembly from the instrument. Refer to
Replacing the Front Panel Assembly” on page 7-10
.
. Measure the fan voltages at J1, J3, and J4 on the A14 system
motherboard.
Figure 4-4 Fan Voltages
3. If the correct voltage is present and the fan connector is in good mechanical condition,
suspect a defective fan. Refer to
“Removing and Replacing the Midweb and the B1
.
4. If the voltage is not present, suspect a defective A14 system motherboard. Refer to
“Removing and Replacing the A14 System Motherboard” on page 7-26
.
Summary of Contents for E8362B
Page 11: ...Service Guide E8364 90026 1 1 1 Safety and Regulatory Information ...
Page 19: ...Service Guide E8364 90026 2 1 2 General Product Information ...
Page 33: ...Service Guide E8364 90026 3 1 3 Tests and Adjustments ...
Page 83: ...Service Guide E8364 90026 4 1 4 Troubleshooting ...
Page 151: ...Service Guide E8364 90026 5 1 5 Theory of Operation ...
Page 185: ...Service Guide E8364 90026 6 1 6 Replaceable Parts ...
Page 269: ...Service Guide E8364 90026 7 1 7 Repair and Replacement Procedures ...
Page 351: ...Service Guide E8364 90026 8 1 8 General Purpose Maintenance Procedures ...