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WARNING:
STATIC-SENSITIVE
PARTS -
HANDLE
APPROPRIATELY.
Table
4-2.
System Checkout
and
Troubleshooting
Procedures (Cont)
Checkout
Pmcedure
Fault
Troubleshooting Procedure
MONITOR
MODE (Cont
)
!:1.
Select
Modulation
dis
play
on
t he
UUT
and
verify
the presence
of
the
received
modulation
'i~nal.
ICI.
Select
c;en/
Mon
Mtrdisplay
and
Widehand
mode
on
the
UUT.
Vary
t
h"
c~:
nt
er
fretjuency
on
either
the
l
ll iT
or
t he
Si~nal
General<>r,
a
nd
verify
that the frequency-errur
d
i,pln.v pruperly
repre~ents
the
difference
h~tween
the
UUT"s
center
I
r"quenc~·
and
the
S
iJ(nal
Generator's
center
freque ncy.
II
.
Se
let·t
IF
di,play un
the
UUT and
verify
on
IF
envelope
on
the
CRT.
SPECTRUM
ANALYZER
I.
St>t
th~
l
'liT
fur
Monitor
function at
No
s
pectrum-analyter
I.
Check
pin
lli
of
the
Prncessnr Interface hoard
:tm
M
Hz.
S
pectrum
Analyzer
display,
~weep.
IAI
I)
fo
r
a
100-
Hzsquare wave. If
it
is
not
present.
;~nd
fl -dH input
attenuation.
Connect
replace
the
Prncessor
Interface hoard.
the
Sil(nal (;eneratur
to
the Antenna
punun
the
UUT.
Verify a spectral
2.
If
the re
i
~
a
ltJO- Hz
bignal.
replace
the
Scnpe/DVM
a
mpl
itude
ol
- 40
dBm
1:
:l
dB
on the
Cunlrol
hoard (A
7).
C'HT
display.
Increase
the
RF
s
tep
attenua tur
sett
in~e
in
10-dB
Spectrum
display is
Replace
.
he
Recei,·er board
IASl.
increment-.
verif~·ing
that the spectral
ampl
itude
decreases by 10
d
B
:t 2
dB
wrunj(.
"i
th each
'
tel).
~.
\
'"rif~·
the
cli• pe rs
ion control
(Oisp
r)
"" rk
~.
DUPLEX
GENERATOR
I.
Srlel't Dupl"x
Cen
display
and
No Duplex
output.
Revlace the
RF'
Input
module (A
I7).
Monitor
FM
fu
nctiun at a
monitor
fr
"4lll'IH'\'
ul
IIMJ
M
Hz.
Set
the
offset
l rt-4lll'llt'~·
tu
~
:;
M
Hz. Wit
h the lmaj(e
-wit!'h
>et
""
!.ow.
verily
a
di~played
llupll'x
lrPquency
ol
;;:;
MHz. Set
the
lrnu.:e
>witd
1
to
Hi)(h,
a
nd
verify a
di-pl.lyt>d
l>upl~x
lreque ncy
of
14!>
:\1H
z.
4-12
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Table of Contents
Troubleshooting
