Agilent Technologies 89410A Service Manual page 36

Troubleshooting the Analyzer
To troubleshoot the power supply
3
Check the A96 Primary Power Supply assembly's ac bias voltages.
a
Place the analyzer on the side closest to the keypad.
b Remove the bottom cover.
c
Wait five minutes to allow time for the power supply capacitors to
discharge.
d
Remove the black power supply shield.
e Connect the power cord and set the power switch to on ( l ).
f
Using an oscilloscope and two 1
following ac bias supplies. See
Oscilloscope Setup
Connect CH1 to A95 P352, pin 1
Connect CH2 to A95 P352, pin 4
CH1 V/div 20 V/div
Input Impedance 1 MΩ
CH1 Coupling dc
Probe Atten 10
CH2 V/div 20 V/div
Input Impedance 1 MΩ
CH2 Coupling dc
Probe Atten 10
Display Mode Repetitive
Averaging 8
Time/div 5 ms/div
Trigger Trg'd
Trigger Level Sweep
−1.8 V
Trig Src
Chan1
g
If the waveforms are incorrect, the A96 Primary Power Supply
assembly is probably faulty.
1-18
M
page 1-19
Parameters
Pulse Shape
Time Relationship
Ω
10:1 probes, check the
for component location.
Waveform
AC BIAS