Chapter 1 37
Troubleshooting
Power Supply Check
If All Voltage Supplies Are Dead
In this case it is necessary to sequentially remove the assemblies,
taking care to disconnect the line-power cord before removing any
assembly. Remove the easy assemblies first, one at a time, and verify
the supply each time (measuring on the E4406-60021 extender board).
After an assembly is disconnected or removed, plug the line-power cord
back into the instrument and re-measure the supply that was down. If
it is still down, continue with the assembly removal.
NOTE If the supply is now up, suspect the last assembly removed as being
defective.
Remove these assemblies first (refer to Chapter 3 for removal
instructions):
• A17 RF assembly
• A18 reference assembly
• A19 synthesizer assembly
• A12 analog IF assembly
• A10 digital IF assembly
• A7 base band IQ assembly (Option B7C)
Other assemblies to remove include:
• A25 SCSI
• A3 front panel interface assembly
• A15 daughterboard assembly
• A4 floppy disk drive
The Minimum Assemblies required to power up the instrument are:
• A21 motherboard
• A6 power supply assembly
• A22 CPU assembly
• A14 fan control board
NOTE The line switch input logic goes into the A14 fan control board to power
up the instrument. Therefore this board must be left in the instrument
when isolating power supply failures.
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