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WARNING:
STATIC-SENSITIVE
PARTS
-
HANDLE
APPROPRIATELY.
Table
4-2.
System Checkout
and
Troubleshooting Procedures (Cont)
Checkout
Procedure
Fault
Troubleshooting
Procedure
MONITOR
MODE (Cont)
1.
Hep~at
step
I
with
t
he
AM
fu nction.
No monitor
frequ
ency·
Go to t
he tmuhleshtKiting list
under
'
'
Frequency
error
display.
Counter
dues nut
wmk."
:I.
Hi! peat
>-tep
I with
the
SSB/
DSBSC
lunl't
iun
and enahle
t he
BFO.
After
the
t~'t.tu
rn
the
RFO
OFF.
Monitor frequency
e
rror
is
I.
Check fur the
IF
signal
at pin
91
of the
Scupe/
wrong.
DVM
Control
hoard
(A7).
If it is
not
present,
4.
Select
the
Narrowband FM
Monitor
r~place
the
Recei
ver
hoard
(AS).
function at
300
MHz,
and set
the RF
s~p at~nuator
to
0
dB.
Connect the
2. If
the IF
s i!(nal
i~
present,
replace
the
cupe/
DVM
RF
Signal
Generator
to
t
he
An~nna
Cuntrnl hoard.
port and the
SIN
AD
Meter
to the
Demod
Out port. Set the RF Signal
Generator
for a center frequency
of300
MHz and for
3kHz
FM at a
1-ltHz
rate.
Adjust the RF
output
level
from
the
Signal
Generator
for
a 10-dB
reading on the SIN AD
Meter.
Verify
that the Signal
Generator's
level
is
less
than
-
103
dBm
(l.S
jJ.Vrms).
.·)
,
lf,inl(
the Modulation
Meter,
calibrate
thE'
In'
Sij(nal
Generator
for
:l
kHz
FM
a
t
;t
1-kH
z
rate.
Set
t he
Genera
to
r
for
a
nwnina
l out
put
level
nf
-
60
d
Bm
a
nd
•·onne~t
it
tuthe
Ante
nna port
of
the
l
l
l
l'J'.
Selett
c:en/
M
on
Mtrd
isplay
and
't-rif~·
a
monit...r
deviation reading
ul
:1
kHz
::
t!;O
Hz.
li.
(',tlihrat
e
the
RF Signal Generator
fur
:~1
kHl
FM
at a
1-k
Hz
rate.
Select
\\'id:!hand
mode on
the
UUT
a nd
verif\ a
rt"ndin~
uf
50
kHz
:: 2.5 kHz
on
1
h!' CH'J",
de,·iatiun
display.
'·
('nlihratP thl•
HF Sil(nal
Gene
ratur
fm
:Ill'
.
AM
at a
J
.
~
Hz
rate.
Set
the
(
;~nerator
for
a
nominal
output
level
uf
-
Htl
dHm
and w nnect it
t
o t he
Anten na
port
of
the
UUT.
Select
!\ol
onit
ur
AM
function
and
Narrowband
mode.
\
'e
rit
y a monitor·
AM
read
in!(
of
:1(1'
.
-:
.
-
),
..
H
~lou
it
or tlw
p!'rrent
Al\1
displayed un
th<·
('I!
'I'
whtiP
mc
rea~inl(
the
Rr
le,•el
IIIII
ol
I
hl! St)!ll>ll <:eneralor. Verify
1
ha
t
1
ht>
I
F-0\'t•rluad \Varnin!(
occur~
lwlo
n
•
1
h.-
<
lt
•
pl
a
~·l·d
AM
exceed> a
n·~uiln:.:.
ol
m•
~
;l· . .
4-11
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Table of Contents
Troubleshooting
