Agilent Technologies 89410A Service Manual page 96

Troubleshooting the Analyzer
To troubleshoot two channel analyzer failures
4
Check the analog source to input paths.
a
Press the following keys:
]
[
Preset
[
Source]
]
[source on
]
[ level
0
[ ]
dBm
]
[
System Utility
[more cal setup]
[
]
auto zero cal off
]
[
Return
]
[
more
[ ]
diagnostics
[
service functions
[
special test modes
[ ]
input
[
channel 1 source
b Using a BNC(m)-to-SMB(f) cable, connect the oscilloscope to
channel 1 A10 J2.
The oscilloscope should display a 130 ±13 mVp-p sine wave.
c
Reconnect the cable from channel 1 A10 J2 to A21 J4.
d Press the following keys:
[channel 1 front BNC
[
channel 2 source
e
Using a BNC(m)-to-SMB(f) cable, connect the oscilloscope to
channel 2 A10 J2.
The oscilloscope should display a 130 ±13 mVp-p sine wave.
f
Reconnect the cable from channel 2 A10 J2 to A21 J4.
g
If both signals are correct, go to Step 5.
h Place the analyzer on the side closest to the display.
i Remove the bottom cover.
j
Set the oscilloscope as follows:
CH1 V/div
Input Impedance
CH1 Coupling
1-78
]
]
]
]
]
100 mV/div
Ω
1 M
dc