Chapter 1 35
Troubleshooting
Power Supply Check
Measure the Individual Voltage Supplies
If any one individual supply line from the A6 power supply assembly
develops an over voltage/current problem, all supply lines are affected.
The supply will go into a “burp” mode where the supplies will cycle on
and off at a low voltage level. The cause of the over voltage/current
condition can be the supply itself or any assembly that the power
supply provides voltage to. If the power supply is in the “burp” mode,
continue with the assembly removal process as described in the section
titled "If All Voltage Supplies Are Dead" on page 37.
WARNING The instrument contains potentially hazardous voltages. Refer
to the safety symbols provided on the instrument, and in the
general safety instructions in this guide, before operating the
unit with the cover removed. Ensure that safety instructions
are strictly followed. Failure to do so can result in severe or
fatal injury.
The power supply voltages are checked using a digital voltmeter.
Voltages measured should be within the tolerances listed in the table
below Figure 1-6 on page 36.
In order to measure the power supply voltages, it is necessary to remove
the instrument’s outer case and top brace. Refer to Chapter 3 for
removal procedures. Use the E4406-60021 extender board to measure
the individual power supply voltages. Insert the extender board into the
empty slot next to the digital IF board.
Refer to Figure 1-6 for the power supply test points on the extender
board. Use the point marked as “ACOM” for the ground connection.
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