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WARNING
:
STATIC-SENSITIVE PARTS -
HANDLE
APPROPRIATELY.
Table
4-2.
System Checkout and
Troubleshooting
Procedures (Cont)
Checko
u
t Pmcedure
Fau
lt
T
roublesh
ooting Procedure
GENERATE
MODE
I.
Set
the
UUT
for
Generate
FM
No
generate
o
utput.
I.
Remove
the
RF
cahle
between
t he
RF
Synthesizer
function
at
200
MHz
a
nd select
Cen/
module
(A9) a
nd
the
RF
Input
mndule
(Ali).
Mun
Mtr
di~play.
Verify
an
RF-Ievel
-
C
heck
for
a
nominallevelufO
dBm at
the
11t1tput
display on
the
C
HT.
Syn thesizer
output.
If
there
is
n
n
nutp
ut. replace
t
he
RF
Synthesizer
mndule.
:!.
(
'onnec·t
the
HF
mill
ivoltme
ter with
a
."~l·o
hm
termination
t.u the
Antenna
2.
If
the
Syn thesizer
output
is o kay.
replace
the
RF
1~"1.
a nd pull
the
HF
Port Select knob
Input module (A I7).
on
the
UUT
to the
Antenna
positio n.
Set
the
HF
~te
p
auenuatur
<Step)
to
0
d
H
11nd
adjust
t
he
Variable
RF
Level
No
frequency
modulation.
1.
C
heck fo
r
the
modulation
sil(nalat
pin
:10 o
f
t
h
e
c·
..
nt rul
for
a d
isplayed
outpu
t
level of
R
F
Synthesizer
mc><lule
(A9).
If
the
s
ignal is
okay,
"
l:ld
Hm.
Verify
that
t
he
RF
replace
t he
RF
Synthes
izer
m
•><lule.
millivuhmeter
reads
+
1:l
dBm
:±
2
d
Hm.
2.
If
the
modulation
sign
al
is
not
presen
t, proceed tn
t
he t
roubleshootin
g
list
under "No
DPL
:1.
H~p et~t
>tep
2
ot
t
h
e
center
frequency
(modulation
)
s
ignal
on the
C
RT."
o
l
l!m MHz.
~
.
ltwr~a't
the
HF
s
tep
au
e nuator setting
in
Jtl.<fH
incre ments.
and
verify that
t
hto
d
i>pla.ved
RF
level
d
ecreases
in
IIHIH
increment.
<
.
5.
Set
t
he Cc><le
Synthes
izer
MODULATION
switch
a nd the Ext
Level contwl
to
OFF.
Select
Narrowband
mc><le
and
adjust the
I
K
Hz
Level
cnntrol
fo
r
a
5-kHz
FM
·
de,·iatiun read
ing
on the
C RT
display.
Ve
r
ity
n
1-kHz to ne at
the
s
peaker
out
put.
H.
C'unru.>ct
tht' Modulation
Meter
to
the
t
lt
" l">
An
t
~:nna
Port
and
pull
the
RF
l'urt
St:lect
knnh
to
the
Antenna
i>"''trun.
Set
the Modulation
Meter
for
n
cl!>l'iauon
di•
pla:v
of
a
k
Hz
:!:
2a0
Hz.
7
S~lec·t
Widehand mnde o
n
the
UUT
u
nd
1erify t hat
the
CRT d
isplays
a
cle1
it~
troll
nl
:W
k
Hz.
Also
ver
ify
that
tlw i\luclula
l
ion Mete
r
<how~
a
peak
cl
..
,·iution
ul
:!0
k
Hz
:!:
I
kHz.
K
St·l~c·t
Mud
uiHtinn dif-play
o
n t
he
UUT
.rnd H
rily
u pellk·to·peak
modu
latiun
•lr-plal'
ol
~11
k
H
r
:!:
:!
kH
1
..
4-9
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Table of Contents
Troubleshooting
