Agilent Technologies 8753ES Option 011 Service Manual page 243

YO Coil Drive Check with Analog Bus
If the analog bus is not functional, perform the
NOTE
Oscilloscope" on page
1. Press
Preset System
SOURCE PLL OFF
.
ANALOG BUS
2. Press
16 x1
sequence lets you check the pretune DAC and the A11 output to the YO coil drive by
monitoring the 1 V/GHz signal at analog bus node 16.
3. Compare the waveform to
assembly is faulty.
Figure 7-6 1 V/GHz at Analog Bus Node 16 with Source PLL Off.
YO Coil Drive Check with Oscilloscope
NOTE Use the large extender board for easy access to the voltage points. The
extender board is included with the 8753 Tool Kit. See
"Replaceable Parts,"
1. Connect oscilloscope probes to A11P1-1 and A11P1-2. The YO coil drive signal is
actually two signals whose voltage difference drives the coil.
2. Press
Preset System
operate the analyzer in a swept open loop mode.
Chapter 7
7-11.
SERVICE MENU
S PARAMETERS
Meas
MORE REAL
Format
Figure 7-6. If the waveform is incorrect, the A11 phase lock
for part numbers and ordering information.
SERVICE MENU SERVICE MODES SOURCE PLL OFF
"YO Coil Drive Check with
ANALOG BUS ON
ANALOG IN Aux Input
AUTOSCALE
Scale Ref
Source Troubleshooting
Phase Lock Error
SERVICE MODES
. This keystroke
Chapter 13 ,
to
7-11