Sony STR-313L - Alignment Procedures

STR-313L STR-313L
FM DISCRIMINATOR ALIGNMENT 2
Procedure:
FM DISCRIMINATOR ALIGNMENT 1
FM rf signal distortion
generator
;
meter
Procedure:
1. Detune the set.
2. Turn the core (primary side) of IFT201 for null-
point reading on the FM TUNING meter.
Ly
FM | TUNING
Null-point reading
FM ANT REC OUT
Carrier frequency: 10.7 MHz
Output level: 1mV (60 dB)
Modulation:
400
Hz,
75
kHz
deviation
(100%
}
1. Set MODE switch to MONO.
2.
Turn
the
core
(secondary
side)
of
IFT201
for
a
minimum
distortion
reading
.on
the
distortion
meter.
/FT201
/FT201 (primary side: blue)
(secondary side: black)
FM STEREO SEPARATION ADJUSTMENT
FM IF ALIGNMENT
Procedure:
FM stereo
Signal
generator
FM rf
signal
generator
FM ANT REC OUT
FM ANT REC OUT
Carrier frequency: 98 MHz
Output level: ImV (60aB)
Mode: Stereo
Modulation:
Audio (400 Hz): 67.5 kHz deviation (90% )
Pilot
(19
kHz}:
7.5
kHz
deviation
(10%
)
MPX
ADJUSTMENT
mn =|
peered
HUTA
ae
A)
Regular
Method
B)
Simple
Method
MODE
switch:
STEREO
Procedure:
Procedure:
1.
Tune
the
set
to
the
FM
stereo
broadcasting
signal.
FM rf signal
generator
FM stereo
signal generator
output channel
L-CH
VTVM
connection
2.
reading
—_—_—
LCH ()
Adjust RT202
R-CH for minimum
reading.
Carrier frequency: 98 MHz
Modulation: no modulation
1mV (6008)
10
a2
C-
frequency
counter
R235
iE
Output level:
—_—_—|—
©
_|Adjust RT202
for minimum
reading.
R-CH
L-CH Stereo separation:
R-CH Stereo separation:
R407
@®-®
©-O
The separations of both channels should be equal.
1. Tune the set to 98 MHz.
2. Adjust RT201 for 76 kHz +100Hz on the counter,
—13—-
—~14—
. Secure RT201 at the center in lighting-up ranje of
FM Signal Generator Setting:
98 MHz
400 Hz, 75 kHz deviation
(100% )
12V (21.5dB)
Carrier frequency:
Modulation:
Output level:
Procedure:
Tune the set to 98 MHz and adjust IFT1 for
a maximum réading on the VTVM.
Turn RT201 clockwise or counterclockwise arid
memorize the lighting-up range of STEREO lanp.
both turns as shown below.
center in lighting-up range
lighting-up range