4-8 Service Guide E8364-90038
Troubleshooting PNA Series Microwave Network Analyzers
Power Up Troubleshooting E8362C, E8363C, E8364C
Measure the Individual Voltage Supplies
WARNING The instrument contains potentially hazardous voltages. Refer to the safety symbols
provided on the instrument and in “General Safety Considerations” on page 1-3 before
operating the unit with the cover removed. Make sure that the safety instructions are
strictly followed. Failure to do so can result in personal injury or loss of life.
To measure the power supply voltages, it is necessary to remove the instrument’s outer and inner covers.
Refer to “Removing the Covers” on page 7-6 for removal procedures. Use the E8356-60021 extender board to
measure the individual power supply voltages. Insert the extender board into an empty slot next to the A6
signal processing ADC module (SPAM) board.
NOTE If any one individual voltage supply from the A4 power supply develops an over-voltage or
over-current problem, all supplies are affected. The supply goes into a “burp” mode
characterized by the supplies cycling on and off at a low voltage level. The cause of the
over-voltage or over-current condition can be the A4 power supply itself, or any assembly to
which the A4 power supply provides voltage. To isolate the cause of “burp” mode, continue
to the assembly removal process as described in the section titled “If All Supply Voltages
Are Missing” on page 4-9.
On the extender board, measure the power supply voltages using a digital multi-meter. Refer to Figure 4-2 for
the power supply test points on the extender board. Use the point marked as “GND” for the ground
connection. Refer to Table 4-1 on page 4-9 for the correct voltages.
Figure 4-2 E8356-60021 Synthesizer/Reference Extender Measurement Points
To Next Page
Loading...
Need help?
General
