Realistic STA-115 - Page 30

FM RF
&
lF
Alignment
Notes:
o
Signal
generator
output should be no higher
than
necessary
to obtain
an output reading.
o
Maintain voltage
at 12O volts
AC, 60 Hz
(U.S.A.,
Canada).
(Use
240 volts AC,
50
Hz for
Australian
models.)
ti-set
sEr-Edron
s*itcrr io-rvr.
--
--i
l-.-t_.t
MoNo
switch
to
oUT
(stereo)
position.
I
Equipment Required
1. Standard
signal
generator
2.
FM
dummy
antenna
3. Oscilloscope
4.
AC voltmeter
5. Distortion
meter
6. Center tuning meter
(1.2kSr,
200pA)
Set-Up
FM
EX'[
ANTENNA
TERMINAL
(3OOO)
/A FM
SG
CENTER
TUilING
r.ET
E R
75 rl
:3O0
rt
Figure
28
oscrLLoscoPE
orsroRTtoN
V,
T. V- M.
METER
iHi;,filllilie,
srA-115
Figure 29
Connect standard
signal
generator
to
FM antenna
terminal
(300Sl)
through
FM
dummy
antenna
(300s2).
connect
oscilloscope,
AC voltmeter
and
distortion meter
to
TApE
oUT
jack.
Connect
center
tuning meter
(1.2ksr,
200pA) to
TP1
andTp2
on
TUNER/AUDlo
p.C.B.
Adjustment
Check
a
a
FM
DUMMY
ANTENNA
trtroootrDODtro
STEP
GENERATOR
FREOUENCY
DIAL
SETTING
INDICATOR
ADJUSTMENT
REMARKS
98
MHz
(
1 000
Hz, 75
kHz
dev.)
lnput:
about
2
-41tV
98
MHz
o
AC
voltmeter
Io
Oscilloscope
I
lo
Distortion
meter
J
T1 01
FM
IF
Adjust
for
maximum
reading
on
meter.
2
98 MHz
(
1
000
H2,75 kHz
dev.)
lnput:
no input
(unit
off)
98 MHz
o
Center
tuning meter
T201
(Primary)
Adjust
for center
point
on
center
tuning meter.
3
98
MHz
(1000
Hz,
75 kHz
dev.)
lnput:
1mV
98 MHz
o
AC
voltmeter
[o
Oscilloscope
'l
Io
Distortion
meterJ
T202
(Secondary)
Adjust for minimum
Distortion
(
better than
0.5%).
4 Repeat
steps
1,
2 and
3 until
no further
improvement
is noticed.
See
Figure
30 and
Figure
31.
-30-