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WARNING:
STATIC-SENSITIVE PARTS
-
HANDLE
APPROPRIATELY.
Table
4-2.
System
Checkout
and
Troubleshooting
Procedures
(Cont)
Checkout Pmcedure
!1.
S
elect
Generate
CW
function
a
nd
ve
rify
that
the
re
i
~
no
mc.dulat ion
nn
the
CHT.
I!J.
Stt the
ll
l
'T
IM
Generate
AM
I
unction and
c;en/
Mon
M
tr dis play.
nnd
adJUM for an
RF output
le
vel
ufO
ci
Hm.
AdJu>t
the
1
KH
z
Level control
l"or
a
:,(1'
,
AM
read
inl(
on
the C
RT.
Verit
y
t ha
t
t
he Modulation
Meter
reud,r~l'
.
:!:
10'
,
AM
.
II
.
Select
Mod
ulation
d
i~ play
and
verify
a
low-di•tnrtion
1-kHz
s inewave.
I"'
Set the !li lT fo
r
Gene ra
te
SSB/
DSHSC
fuoKtion
and
ver
ify a
lcow·
cli>tortion
1-kH?. s
inewave
on the
C'
HT.
t:t
Set
the
UliT
fur
Generate
SWP
1-10
M
Hz fu nc
t
ion
and
Sccope
DC
d
isplay.
\"e
rify
a
horiwntaltra
c:e
a
nd
a
center·
rr~quem·y
di~
pla
y
o
n
the
CRT.
1~
.
Set
the
llliT for Generate
S
W
P
O.Dl·
I MHz
!"unct
ion
and
verify the
same
re<ulls
a'
in
s
tep
I :1.
Set
the
lilT
to
POWER Munitur
mode.
Set
t hE!
H
F
st!'p
attenuator
at 30
dB,
and
>elct·t C:
en/
1\.lon
Mtr
d
isp
l
a~·.
Connect
t
he
HF
power
>ourr~
t
o
t
he
RF
In/
Out
port.
h:ey
the powe
r source
and
veri
fy
a
correct
power
read
o
n~
on the CRT d is
play.
Unkey
t
h~
p
uwer
""uurce.
I
S Pt
the
lll
'T
to
Monitor
F'M
funcuun.
Set
the
Squelch
control
to OF
F
a
nd
ve
ri
f~·
1
hl'
>i:.:nal-level
LED
(Sil(
Lvll
lil(ht> up and
1
here
is
noi•
e a
t
t he
'l'~aker
.
Turn the
Squekh
ccontml
t
ully
0
'
nnd , -erifv the Sil{
Lvl LED
~~~~:-.oil"
and there
i
~
nu
nui~
at th
t
'l'l"ilker.
Fault
Troubleshooting
Procedure
GENERATE MODE
(Cont)
POWER
MONITOR
MODE
Internal
Wattmeter
is
wrong.
MONITOR MODE
Nco Mo
nitcor
function
.
4-10
Replace
RF Input Module (A
17}.
I.
Apply
a
IO.i-
MHz
modu lation
ca
rrier
to
the RF
input.
Check for norma
l
receiver
cope
ration,
but
with
reduced
sen~
i
tivi
ty.
If
the
receiver
is
not
workinl(,
re )>lact the Rect!iver
huard
(A8)
.
2.
If
the
r~ceive
r
c
he<·ks cokay
and
the
Generate
functicon
i•
cokay.
replace the
HP
Input
module
(At';)
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Table of Contents
Troubleshooting
