4-12
Service Guide E8364-90001
Troubleshooting
PNA Series Microwave Network Analyzers
Power Up Troubleshooting
E8362A, E8363A, E8364A
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 7-24
.
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 ...