Agilent Technologies 8935 Series, Manual

Page: 49 / 343

48 Chapter 3
Troubleshooting
How to Troubleshoot the Test Set
How to Troubleshoot the Test Set
Document the result of each step in case you need to contact Agilent
Technologies for service assistance. General troubleshooting steps are
illustrated in
Figure 3-2 on page 49 .
NOTE
Periodic Adjustment Interval
The calibration programs Periodic Calibration, IQ Calibration and
Eb/No Calibration should be performed after the replacement of any
assembly referred to in
Table 7-1 on page 159 , or at least every 24
months. See Chapter 7 , “Periodic Adjustments,” on page 157 for details.
On power-up, the Test Set runs the Self-Test Diagnostic. Most of the
Test Set’s digital control functions are tested. The outcome of the test
appears on the display (if operating) and on four LEDs viewable
through an access hole in the top internal cover, see
Figure 3-1 .
Figure 3-1 LEDs
0
leds_1
k1
k1©
k2
k3
k4
k5
Sh
ift
Shift
k2©
k3©
k4©
Rele
ase
Me nu
Pau
se/ Continue
CD
MA Ge
n
RF
Ge n
CD
MA
Anl
RF
Anl
Cod
e Dom
Spe
c
Anl
Pre
set
Hold
Rec
all
Loc
al
Me
as Res
et
Sav e
AD
RS
Pre
v
Prin t
Inst
Con
fig
Help
Prin
ter
Con
fig
I/O
Con
fig
Erro
r Me
ssa
ge
AF
An l
Sco
pe
Res
et
mW
Hz
µV
s
kH z
mV
%
MH
z V
GH
z
dB m
Ente
r
ms
%
D
dB µV
D
+/-
3
6
9
No
ppm
W
C
.
F
2
5
8
Yes
On
/Off
B
0
E
1
4
7
Hi li
mit
Avg
Incr
x 1
0
Me
ter
Incr
Set
Can
cel
Lo L
im
it
Ref
Set
Incr
10
dB
A
EE
X
Un
loc
k
Vo
lum
e Sq uelc
h
Push to Select
REFERENCE
Inte
rna
l
Ext
ern
al
LEDs
1
2
3