Agilent Technologies PNA Series Service Manual page 90

Troubleshooting
Power Up Troubleshooting
If All Supply Voltages Are Missing
Disconnect the line-power cord before removing any assembly.
WARNING
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.
It is necessary to sequentially remove all of the assemblies, taking care to disconnect the
line-power cord before each removal, and then to 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 Chapter 7 for removal instructions).
1. Unplug the test set motherboard cable from the A16 test set motherboard (refer to
"Removing and Replacing the A16 Test Set Motherboard" on page
2. Unplug the front panel interface cable from the A3 front panel interface board (refer to
"Removing the A3 Front Panel Interface Board" on page
3. Remove the A6 SPAM board (refer to
Boards" on page 7-18).
4. Remove the A8 fractional-N synthesizer board (refer to
A6, A8, A9, and A10 Boards" on page
5. Remove the A9 fractional-N synthesizer board (option 080) (refer to
Replacing the A6, A8, A9, and A10 Boards" on page
6. Remove the A10 frequency reference board (refer to
A8, A9, and A10 Boards" on page
7. Remove the A11 phase lock board (refer to
Lock Board" on page
8. Unplug the A30 floppy disk drive from the A14 system motherboard (refer to
and Replacing the A27, A28, A29, and A30 First Converters (Mixers) and Mixer Bias
Board" on page 7-48).
9. Unplug the A31 hard disk drive from the A15 CPU board (refer to
Replacing the A31, A32, A33, and A34 Receiver Modules and LO Reject Filter Board" on
page 7-50).
The minimum required assemblies to power up the analyzer are:
• A4 power supply
• A14 system motherboard
• A15 CPU board
4-10
"Removing and Replacing the A6, A8, A9, and A10
7-18).
7-18).
7-20).
PNA Series Microwave Network Analyzers
7-12).
"Removing and Replacing the
7-18)
"Removing and Replacing the A6,
"Removing and Replacing the A11 Phase
Service Guide E8361-90001
E8361A
7-30).
"Removing and
"Removing
"Removing and