Sony STR-313L User manual

GENERAL
Power Requirements:
Power Consumption:
Dimensions:
Weight:
FM SECTION
Frequency Range:
Antenna:
Intermediate
Frequency:
Sensitivity at
50dB Quieting:
SPECIFICATIONS
240V ac, 50H2(UK model)
120V, 220V or 240V ac adjustable,
50Hz(AEP model}
210W(UK model)
180W(AEP model)
Approx.410(w)x145(h)x310{d)mm
: 16(w)x5 3/4 (h)x12 "/s (d) inches
including projecting parts and
controls
Approx.7.6kg, 16 Ib 13 oz (net)
Approx.8.8kg, 19 Ib 7 oz {in shipping carton)
87.5—108MHz
300 © balanced
75 2 unbalanced
10.7MHz
3.5uV (10.7dB) (MONO)
45uV (33dB) (STEREO)
SAFETY RELATED COMPONENT WARNING?
APONENT
ON THE
OPER ATION
IDENTIFIED BY
SCHEMATIC DIAGRAMS,
S
AND
IN
THE
PARTS
LiST
ARE
CRITICAL
TO
REPLACE THESE COMPONENTS
i SONY PARTS WHOSE PART NUMBERS APPEAR
SHOWN
IN
THIS
MANUAL
OR
IN
SUPPLEMENTS
LISHED BY SONY
SHADING ANG MARK
EXPLODED
Sensitivity
at 46dB Quieting:
AEP Model
UK Model
4uV (12dB) (MONO)
{at 40kHz deviation) 50uV (34dB) (STEREO)
Usable Sensitivity:
{at 40kHz deviation)
S/N Ratio:
Harmonic Distortion:
1M Distortion:
Separation:
Frequency Response:
1.8uV (5dB), HF
1.6uV (4dB), S/N=26d0B
75dB (MONO)
70dB (STEREO)
At 100Hz
0.2% (MONO)
0.3% (STEREO)
At 1kHz
0.2% (MONO}
0.3% (STEREO)
At 10kHz
0.3% (MONO)
0.5% (STEREO)
0.2% (MONO)
0.3% (STEREO)
30dB at 100H%Z
45dB at 1 kHz
35dB at 10kHz
40-12, 500Hz*9:5 dB
30-15, OOOHz *3:3 dB
— Continued on page 2 —
SERVICE MANUAL

STR-313L
Selectivity:
Capture Ratio:
AM Suppression Ratio:
Image Response Ratio:
IF Response Ratio:
Spurious Response Ratio:
RF Intermodulation:
Muting Threshold:
SW/MW/LW SECTION
Frequency Range:
Antenna:
Intermediate
Frequency:
Usable Sensitivity:
S/N Ratio:
Harmonic Distortion:
Selectivity:
60dB (400kHz)
40dB (300kHz, S/N=26dB, 40kHz
deviation)
1.0dB
54dB
45dB
90cB
75dB
60dB
Approx. 5uV
SW: 5.8—-15.8MHz
MW: 530—1,605kHz
LW: 150—350kHz
SW/MW: External antenna terminal
Attached antenna wire
LW: Built-in Ferrite-rod antenna
External antenna terminal
468kHz
SW: 30uV (29.5dB),
* external antenna (10MHz)
MW: 100uV (40dB),
external antenna (1,000kHz)
LW: 500uV/m (53.8dB/m),
built-in antenna
100uV (40d8),
external antenna (230kHz)
SW/MW: 52dB (5mV)
LW: 52dB (50mV/m)
SW/MW: 0.3% (5mV, 400Hz)
LW: 0.3% (50mV/m, 400Hz)
28dB (9kHz)
30dB (10kHz)
AUDIO AMPLIFIER SECTION
Continuous RMS
.Power Output:
Less than 0.5% THD, both channels
driven simultaneously
At 20—20, OOOHz
25W+25W (8 2)
At 1kHz
27W+27W (8 Q)
According to DIN 45500
25W+25W (8 &2)
25W+25W (4 2, less than
0.7% THD)
e MODEL IDENTIFICATION
— Rear Panel —
AEP model
=
SONY. |FM-AM PROGRAM RECEIVER
MODEL NOSTR-3I3L
FREQ RANGE : FM87.5-108 MHz
SW 5.8 — 15.8 MHz
MW 530-1605 KHz
LW 150-350 KHz
iF : FM 107 MHz
AM 468 KHz
AC: 220V ~ 50Hz 180W
MADE IN |
SIRIAL NO
Ns sets | es
Dynamic Power Output:
Power Bandwidth:
Damping Factor:
Harmonic Distortion:
IM Distortion:
(60Hz: 7kHz=4:1)
Residual Noise:
Frequency Response:
IHF constant power supply method
9OW (8 2)
10—40, O000Hz, IHF
20 at kHz (8 2)
Less than 0.5% at rated output(8 2)
Less than 0.7% at rated output (4 2)
Less than 0.2% at 1W output (8 2)
Less than 0.3% at 1W output (4 9)
Less than 0.5% at rated Output
Less than 0,2% at 1W output
Less than 0.08uW (at 82)
PHONO:
ee equalization curve +1 dB
10-50, 000 Hz * 148
—3dB
Inputs:
nye Weighting
Sensitivity | Impedance | S/N network
PHONO
|
2.5mVv
(-sod8)
|
50k2
|700B]
A
150mV (—15.5dB)| 100k2 |90dB A
Measured with rated output power into 89 loads
{both channels driven simultaneously) at 1kHz.
Outputs:
(with rated input)
[| voir | “rpadanes
REC OUT |150mV (-15.50B)) — 10kQ |
Headphones:
Speaker:
Tone Controls:
Loudness Control:
Accepts all low or high impedance
headphones
4—16 2 speakers are suitable.
BASS +8d8 at 100Hz
TREBLE +8dB at 10kHz
+8dB at 100Hz
(att. 30dB) +3dB at 10kHz
UK model
SONY. |FM-AM PROGRAM RECEIVER
MODEL NO,STR-3I3L
FREQ RANGE : FM875-108 MHz
SW 5.8 — 15.8 MHz
MW 530-1605 K Hz
LW 150-350 KHz
iF : FM 107 MHz
AM 468 KHz
AC: 240V ~ 50Hz 210W
MADE IN 4
SIRIAL NO

1-1.
SW/ MW
J802
TAPE
J803
BLOCK DIAGRAM
ANTENNA
L80l
LW FERRITE -ROD
SECTION 1
OUTLINE
FRONT-END BLOCK
! Cm rea
$2
FM-
BAND
gIND ago NO
PHONO —~°
SENSO
M
SW
$3-3
MONITOR
SOURCE
TAPE
STEREOS
$4-3
S|
(BAND SELECTOR)
LW —p>
PROGRAM
R
—>
W 5
STR-313L STR-313L
RV60I
VOLUME
MONO
R-CH
FM
IF
AMP
/
FM
DET
/
(4)
MPX
®
AM
CIRCUIT
ee
1
202
(5)
CW)
R-CH
(3)
(3)
(8) (5)
:
FLAT
AMP
;
PL201
20!
cat.
na
ees
(3)
STEREO
STEREO
SEPARATION
S$4-2
i
S4-|
vO
STEREO
Lag
RT201
yO
B+
B+
MPX
fence,
MONO
ee
ont
es
fs
oe
Oke
D401
SASOE
0204
SWITCHING
MUTING
a4ol
Q202
PHOTO
4
FM
SENSOR
FM
PL
40l
N
SWITCHIN
SWITCHING
1¢
401
402
403
Ls)
(PROGRAM)
0405
as
PL403
PROGRAM
SOURCE
SENSOR
si-
OTAPE
$2-3
PL404
TUNER
9
0404
PL405
SWITCHING
0406
[PHONO]
PL406
TAPE
PL4
LW
SENSOR
LW
Th
SWITCHING
SWITCHING
0404
0405
(PROGRAM)
$5-!
OUDNES
LOUDNESS
B60!
ae
6)
satel
(Equacizer)
d
o-
Ff
y601
AMP
PTBOI
gg
.
>——}
0-4]
[HEADPHONES
a
a
toy
#
je
VOLTAGE
(TUNER)
REGULATOR
So
ac
IN
701
R-CH
RV602
BALANCE
RV603
RV604
B+
BASS
TREBLE
(ROMER)
B-
o |+
L
o |+
R

“STR-313L
1C201 (CX168), 1C202 (CX178) <General>
@ Muting Gate
Regulator
These two ICs form a system. Both of them are
Muting Canceler Circuit
e
bipolar-linear-ICs. CX168 integrates 343 elements and e
CX178 integrates 260 elements. They include many @ Pop-noise Canceler
functions and are improved upon the degree of inte- @ Hysteresis Circuit
gration now available as a linear-ICs for tuner use.
They have high performance in FM reception and
form a muting system having an FM muting attenua-
tion of 90dB. In addition, because a muting circuit is
newly employed in the AM circuit not only is there
' high performance in FM reception but AM station The terminals () and (2) of the photo interrupter
| operate as the light emitting diode. On the other
' signal can be received with fine tone quality and sen- pg ah cats
| sitivity as with FM broadcasting station. As an addi- and, the terminals (3) and (4) operate as the photo
detector. When the photo detector receives the light
tional
function,
they
operate
for
FM/AM
continuous
Pace
: :
station selection, FM/AM signal-strength meter out- ON in Fig. a, the terminal Derwcen senminals (3)
put, FM/AM muting output switching and enforced and (4) is a low-impedance. When light is intercepted
AGC
at
FM
reception.
by
the
marker,
as
shown
in
Fig.
4,
it
becomes
high-
impedance.
Photo Interrupter (1C401, 402)
CX168 Main Function When the photo detector receives the light | When light is intercepted
photo interrupter (1C401, 402)
photo detector
photo detector.
<FM>
IF Amplifier
Quadrature
detector
aoe
Signal-strength
Meter
Output
LC
aaa
ee
=|
Muting
Signal Output
light
emitting
-—
AFC
Output
for
Converter
diode
Side
view
Back
view
Multipath
Signal
Output
light
emitting
diode
Bandpass
Control
Circuit
Fig.
3
Fig.
4
p M>
RF Attenuator
Mixer
Oscillator
IF Amplifier and AGC
AM Detector
Signal-Strength Meter Output
Signal Generator for AM Muting
<General>
® Regulator
@ FM/AM Switching
® Regulator Output
CX178 Main Function
<FM Stereo Demodulator>
@ FM Stereo Demodulator
Phase Detector
Stereo Indicating Circuit
vco
VCO ON/OFF Circuit

1-2. CIRCUIT DESCRIPTION (See Fig. 1)
Program Sensor
When
the
band
selector
switch
(S1)
and
FUNC-
TION switch (S2) are set to PROGRAM position and
band selector position respectively and the pointer
matches with a station marker, FM or LW station is
automatically selected through optical detection.
(Fig. 2)
1) When the pointer matches only with the .FM
station marker:
a)
The
light
of
IC401
(Photo
Interrupter)
is
inter-
cepted
by
the
marker,
bias
voltage
is
applied
to
the
base
of
Q402
through
R405,
and
Q402
is
turned
on.
b) The collecter voltage of Q402 reduces and D401
is turned on.
c) The terminal @3) of IC201 is grounded through
D201, R204, D401, Q402 and D403.
d) FM circuit operates (The terminal Q3) of IC201
serves as a switch).
Note: When B + voltage is applied to the terminal
Q3) of IC201 through R401, R204 and
D201, the receiver is in AM mode. At the
same time, as Q403 is on, PL401 (FM
indicator lamp) lights.
2) When the pointer matches only with the LW
station marker:
a) As the light of IC401 is not intercepted, Q402
and D401 are turned off. As a result, B + voltage
is applied to the terminal Q3) of IC201 through
R401 and R204. On the other hand, the light
of IC402 is intercepted by the LW station
marker,
b) Q404 and Q405 are turned on.
c) B + voltage is applied to L306 (LW oscillator
coil).
d) LW circuit operates. When Q405 is on, PL402
(LW indicator lamp) simultaneously lights.
(C201
TERMINAL (23)
020!
R204
R40)
L306
(Lw osc)“
STR-313L
3)
When
the
pointer
matches
simultaneously
with
both
the
FM
and
LW
station
markers:
a)
Q402
and
Q403
are
turned
on
by
intercepting
the
light
of
IC401.
On
the
other
hand,
the
light
of
IC402
is
also
intercepted
and
the
bias
voltage
is
applied
to
the
base
of
Q404,
but
because
the
collector
voltage
of
Q403
is
high,
D404
is
turned
off.
The
emitter
voltage
of
Q404
rises
-
and
B
+
voltage
is
not
applied
to
L306
(LW
oscillator
coil)
and
PL402.
Consequently,
only
the
FM
station
signal
is
received.
10401
FM station
marker
The light is
3 ain tercepted
sp: by this portion.
LW station
marker
pointer
'C€402
Fig. 2
Q202 and 401
Q401
operates
to
improve
the
rise
time
of
P1401
(FM
indicator
lamp)
or
PL402
(LW
indicator
lamp)
when
tuning
the
receiver,
and
at
the
same
time
Q401
switches
Q202.
Q202
serves
as
a
high-speed-muting
switch
which
is
turned
on
or
off
as
soon
as
the
station
signal
is
tuned
or
detuned.
(C202
TERMINAL(IS)
Q202
i)
Rac2= ——- R403
(SENSOR BOARD J
Fig. 7
es
ee
eee
SOURCE
a,
a PL401 {FM}
Fey 0406
RANG
PLaoe LW] paar sl
Zrais so(RUNCTIR] S"BANO SELECTOR}
TAPE
Lw
’
; PROGRAM
@ AND = SOR
SELECTOR, MW
PHONO sly

§TR-313L | AP
IC REPLACEMENT
TA, P3x8;
w/teeth heat sink
5)
PTT3x12
Note:
Tighten two screws
alternately.
Do not tighten to
excess.
BVTT3x6
&, @ BVTT3x6
Unsolder the pins of 1C601.

SECTION 2
STR-313L
DISASSEMBLY
e@ Follow the disassembly procedure in the numerical order
given.
TOP COVER REMOVAL
top cover screw
top cover
top cover
screw
BOTTOM PLATE REMOVAL
BVTT3x6
BVTT3x6
3)
bottom plate
retainer
DIAL CORD STRINGING
e See page 9.
FRONT GLASS REMOVAL
TA, B3x6
front panel
front glass
glass retainer
FRONT PANEL REMOVAL
5)
front panel
Pull out the knobs.
set screw
2mm )

STR-313
« d
756mm ‘ai : spring
DIAL
CORD
STRINGING
(29%
inches)"
1}
Preparation
=|
Ly
20
Cut the rest of cord off.
Squeeze here,
<
V
7 a
Turn the tuning capacitor shaft fully clockwise
and set the dial drum so that the slot
is positioned as shown below.
we
2) Stringing
10
©
Wind the dial cord
two turns.
3) Dial Pointer Installation perform the mechanical-dial calibration 2)
by utilizing off-the-air local signals. TA, B3x6
dial cord
o be
After dial calibration,
string the dial cord
while taking the
dial pointer up.
(cm)
0

STR-313L
SE
SL
CTION 3
ADJUSTMENTS
3-1. | SW, MW SECTION
Setting:
FUNCTION
switch:
(Band
Selector)
(Band
Selector)
:
SW,MW
[Mw] AM rf signal
generator
Put the lead-wire
Sy antenna close to
the set.
(
30% amplitude
modulation by
400 Hz signal
AM rf signal
generator
CON
30% amplitude s
modulation by
400 Hz signal
external antenna
10pF terminal
i if ~ Do |
iti eam |
1304 =i CT304
6.5 MHz. 16.1 MHz
Adjust for a maximum reading
on VOM.
VOM
(range: 0.5-5V ac)
REC OUT
e Repeat the procedures in each adjustment
several times, and the frequency coverage
and tracking adjustments should be finally
done by the trimmer capacitors.
MW FREQUENCY
COVERAGE ADJUSTMENT
Adjust for a maximum reading
on VOM.
4305 | 520 kHz
CT305 | 1680 kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading
aad | y on VOM.
CT302 1400 kHz
L302 600 kHz
CT301 | L301
| 15 MHz | 6 MHz
Adjust for a maximum reading
on VOM.
SW FREQUENCY
COVERAGE ADJUSTMENT
=
SW TRACKING ADJUSTMENT |
—~10—

SS
|
STR-313L
3-2. | LW SECTION
Setting:
FUNCTION
switch:
(Band
Selector)
(Band
Selector):
LW
ANTENNA
LW
switch:
BUILTIN
AM
rf
signal
VOM
generator
:
(range:
0.5—5V
ac}
Ni Put the lead-wire
antenna close to
O the set. .
G
set ft}
30% amplitude
modulation by
400
Hz
signal
REC
OUT
e Repeat the procedures in each adjustment
several times, and the frequency coverage
and tracking adjustments should be finally
done by the trimmer capacitors.
LW
EXT
ANTENNA
COIL
ADJUSTMENT
AM
rf
signal
LW
dummy
antenna
generator
20H
125pF
3202 400pF
Carrier frequency: 170 kHz
30%
amplitude
modulation
external
antenna
Fog
by
400
Hz
signal
:
REC
OUT
1.
Set
the
ANTENNA
LW
switch
to
EXT
position.
2.
Tune
the
set
to
170
kHz
and
adjust
L303
for
a
maximum
reading
on
VOM.
LW TRACKING ADJUSTMENT
Adjust for a maximum reading
on VOM.
CT303 310 kHz
L807 170 KHz
LW FREQUENCY
COVERAGE ADJUSTMENT
Adjust for a maximum reading
on VOM.
L306 | 145 kHe
CT306 | 365 kHz
Sell ‘ mal Be
SMAI Pritt
—-W1-—