Agilent Technologies 89410A Service Manual page 41

8
Check for power supply loading.
a
Set the power switch to off ( O ) and disconnect the power cord
from the rear panel.
b
Place the analyzer on the side closest to the display.
c
Wait five minutes to allow time for the power supply capacitors to
discharge.
d Disconnect the +5V (red) and GND (black) cables from J301 and
J302.
e
Remove the screws and standoffs holding the A95 Main Power
Supply assembly in the chassis. See ''To remove main power
supply'' on page 3-16
f Disconnect the motherboard cable from A95 P355, the display
power cable from A95 P356, and the optional oven cable from A95
P357.
g
Connect A95 J302 to the chassis.
h Connect A95 P360 pins 2 and 3 together. This provides a test load
for the power supply.
i
Place the A95 Main Power Supply assembly on its side.
The assembly should not be touching the analyzer and it should
still be connected to the A96 Primary Power Supply.
j Connect the power cord and set the power switch to on ( l ).
k
Check the voltages in the table on page 1-21.
l
If the voltages are still incorrect, the A95 Main Power Supply
assembly is probably faulty.
The voltages may vary slightly from the power supply nominal
values due to the change in load.
Troubleshooting the Analyzer
To troubleshoot the power supply
1-23