Agilent Technologies N5230A Service Manual page 78

Troubleshooting
Power Up Troubleshooting
Measure the Individual Voltage Supplies
The instrument contains potentially hazardous voltages. Refer to the
WARNING
safety symbols provided on the instrument and in
Considerations" on page 1-3
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
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.
If any one individual voltage supply from the A4 power supply develops an
NOTE
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
Voltages Are Missing" on page
On the extender board, measure the power supply voltages using a digital multi-meter.
Refer to Figure 4-3 for the power supply test points on the extender board. Use the point
marked "GND" for the ground connection. Refer to
voltages.
Figure 4-3 E8356-60021 Synthesizer/Reference Extender Measurement Points
4-8
before operating the unit with the cover
"Removing the Covers" on page 7-6
4-9.
PNA Series Microwave Network Analyzers
"General Safety
for removal procedures. Use
Table 4-1 on page 4-9
Service Guide N5230-90014
N5230A
"If All Supply
for the correct