Troubleshooting from the Front Panel
The following procedure uses most of the diagnostics of the spectrum analyzer. Before
attempting to diagnose a module failure, use this procedure to collect all possible clues.
Note
Before
testing
a lightwave signal analyzer using this procedure, refer to
\Troubleshooting
a
Lightwave Signal Analyzer" in this chapter.
1.
V
erify
the
function
of
the
system display by pressing
4
DSP
5
on
the
HP
70205A
graphics
display
,
4
DISPLAY
5
on
the
HP
70206A
system
graphics
display or HP 70004A color display.
2.
Select
N
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
display tests
.
3.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CONFID TEST
.
4.
It
is
indicated
on
the
screen
display title line whether the condence test passed or failed.
a.
If the condence test failed, press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
REPORT ERRORS
. Record any errors, then refer to the
appropriate service manual to repair the faulty display instrument.
b. If the condence test passed, continue with this procedure.
Note
If
an
HP
70907A/B
external
mixer
interface module is the only RF section in
the system being tested, skip the next step.
5. Connect the local oscillator CALIBRATOR signal to the RF INPUT of the modular spectrum
analyzer.
If the system is a lightwave signal analyzer, disconnect the cable between the RF OUTPUT of
the lightwave section and the RF INPUT of the RF section. Connect the CALIBRATOR signal
directly to the RF INPUT of the RF section that is installed in the system.
6.
Press
4
USR
5
on
the
HP
70205A
graphics
display,
4
USER
5
on
the
HP
70206A
system
graphics
display
or
HP
70004A
color
display
to access the user softkeys.
7.
Press the
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM DIAG
softkey. Allow approximately 5 to 10 minutes for the program to
run.
Note
If there is no
N
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SYSTEM DIAG
softkey label, or if the System Diagnostics program
does not run when the softkey is pressed, refer to the \System Diagnostics"
information in this section.
8. If System Diagnostics cannot be run from either the front panel or from an HP 9000
Series 200/300 controller, perform the following steps to initiate a self-test of the system.
a. If the system contains an HP 70908A RF section, press Instrument Preset
4
I-P
5
and allow
one complete sweep. Then press
4
MENU
5
,
NNNNNNNNNNNNNN
FREQ
,
NNNNNNNNNNNNNN
SPAN
,100
NNNNNNNNNNN
MHz
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
CENTER FREQ
, 300
NNNNNNNNNNN
MHz
.
This sets the span to 100 MHz and the center frequency to 300 MHz.
b. Press either the
4
MNU
5
key on an HP 70205A graphics display,or the
4
MENU
5
key present
on an HP 70206A system graphics display and HP 70004A color display.
c.
Press
NNNNNNNNNNNNNN
Misc
d.
Press
NNNNNNNNNNNNNN
MORE
e.
Press
NNNNNNNNNNNNNNNNNNNNNNN
service
5-12 Troubleshooting
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