Realistic STA-115 - Page 24

CONNECTION
REPAIR
REPAIR
FM RF/lF Operation
Check
iAoirit
o*Frvr
,r[r*.ni,
if required.
I
i_t::
qrr:
99 l"rl[
II _q
[
4,1LGI[EIr.
i
f.
Conn""t
FM
standard SG
(1000
Hz, 75k{zdev.)
to
FM
3OOO antenna
)
I *rr"ri. I
l.
aonn.., oscilloscope,
distortion
meter
and
V.T.V.M.
to
TAPE OUT
Jack.
I
l.
S.t SELECTOR
switch
to
FM
position.
,,.ro"r,ln
V T. V. II.
METER
Figure 20
Lq 1a"l._iry s ei"rrs_"J
**
The lowest
dial
pointer
setting
unit
is
87.9
MHz
and
highest
pointer
position
should
be over 108
MHz."*
(1)
Readjust
FM
coverage.
(See
page
30for
FM
RF
&
lF ALIGNMENT.)
(2)
Check FM RF circuits.
Coverage
is less
than
87.9
MHz
-
108
MHz.
Coverage
is
at least
87.9
MHz
-
108
MHz.
[c-&s(Ili!.ll,r:yi,r-+-s-o.9Etlo-1.09]4Ii
j
"*
should
be
less
than
3.8trrV**
Readjust FM tracking.
(See
page
30
for FM RF
&
lF
ALIGNMENT.)
Check FM RF
circuits.
FM
IHF sensitivity
is
higher
than
3.8pV.
FM
IHF sensitivity
is lower than 3.8trrV.
iEr',"-"r.
t.
H. oirionio"lor
Molrro signJr.l
ll
l_ney U r_v_, I
y
_r1,!
qT9
_s 9,_
s_a_
Y Ir f
Ll
**
Lower
than
0.5%.*"
(1)
Readjust
RF/lF.
(See
pase
30 for
FM
RF
&
lF ALIGNMENT.)
(2)
Check
FM RF/lF circuits.
T.H.
distortion is higher
than 0.5%.
T.H. distortion is lower than
0.5%.
(1)
QI
\-/
I
trtroootrtrtrtrEo O
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