Sony STR-V 25 User manual

US Model
Canadian
Model
Photo : US model
FM
STEREO
/FM-AM
RECEIVER
SPECIFICATIONS
GENERAL
System: Superheterodyne FM/AM tuner
Dimensions: US model;
Approx. 430 (w) x 135 (h) x 380 (d) mm
Equalizer
amp
section:
IC
op-amp,
NF
type
16
'%
(w)
x
5
3%
(h)
x
14
%
(d)
inches
Tone amp section: IC op-amp, NF type
Power amp section: Pure-complementary
dc amp
Power Requirements: 120 V ac, 60 Hz
Power Consumption: US model; 80 W
Canadian model; 120 W
AC Outlets: Switched 100 W
Unswitched 300 W
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
AN ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL TO
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES
COMPOSANTS
IDENTIFIES
PAR
UNE
TRAME
ET
UNE
MARQUE
/\
SUR
LES
DIAGRAMMES
SCHE-
MATIQUES,
LES
VUES
EXPLOSEES
ET
LA
LISTE
DES
PIECES
SONT
CRITIQUES
POUR
LA
SECURITE
DE
FONCTIONNEMENT.
NE
REMPLACER
CES
COMPOSANTS
QUE
PAR
DES
PIECES
SONY
DONT
LES
NUMEROS
SONT
DONNES
DANS
CE
MANUEL
OU
DANS
LES
SUPPLEMENTS
PUBLIES
PAR
SONY.
Canadian model;
Approx. 460 (w) x 135 (h) x 380 (d) mm
18 (w) x 5% (h) x 14% (d) inches
including projecting parts and controls
Weight: US model;
Approx. 7.7 kg, 17 Ibs (net)
Approx.
8.8
kg,
19
Ibs
3
0z
{in
shipping
carton)
Canadian model;
Approx.
8.5
kg,
18
Ibs
12
oz
(net)
Approx.
9.6
kg,
21
Ibs
3
oz
(in
shipping
carton)
AMPLIFIER SECTION
Power
Output
and
With
8
Q
loads,
both
channels
driven,
from
Total
Harmonic
20
—
20,000
Hz;
rated
28
W
per
channel
Distortion:
—=
minimum
RMS
power,
with
no
more
than
0.04
%
total
harmonic
distortion
from
250
mW
to
rated
output.
— Continued on page 2 —
SERVICE
MANUAL
wee

STR-V25
Damping Factor:
Dynamic Headroom:
Intermodulation (1M)
Distortion:
(60Hz: 7kHz=4: 1)
Residual Noise:
40 at 1 kHz,8 2
1.5 dB
Less than 0.04 % at rated output
Less than 0.2 mV at 8 2
Inputs:
|
Sensitivity
Impedance
S/N
WED
pHoNo
|
Eyam)
|
SOK
|
Segue]
A
TAPE
1.2
|
(Tees
|
SK?
|
goaer|
4
eux
|
cree
|
52%
|
ove]
|
Measured with rated output power into 8 2 loads (both channels
driven simultaneously) at 1 kHz
*'78 JHE
Outputs (with rated input):
REC OUT 1,2 [Voltage 150 mV (—14.5 dB), Impedance 10 k2Q
HEADPHONES | Accepts low impedance headphones.
SPEAKER A, B
8 — 16 Q speakers are suitable.
Measured with rated input, FM 30 % modulation
Frequency Response:
Tone Controls:
Loudness Control:
(att. 30dB)
FM TUNER SECTION
Tuning Range:
Antenna Terminals:
Intermediate
Frequency:
PHONO: RIAA equalization curve + 0.5 dB
AUX, TAPE 1,2: 5Hz—~— 70 kHz a dB
BASS + 10 dB at 50 Hz
TREBLE + 10 cB at 20 kHz
+10 dB at 50 Hz
+3 dB at 10 kHz
87.5 — 108 MHz
300 2 balanced
75 Q unbalanced
10.7 MHz
Sensitivity at 50dB
Quieting:
Usabte Sensitivity:
Signal-to-noise Ratio:
Harmonic Distortion:
Separation:
Frequency Response:
Selectivity:
Capture Ratio:
AM Suppression Ratio:
Image Response Ratio:
IF Response Ratio:
Spurious Response
Ratio:
RF intermodulation:
Sub-carrier Product
Ratio:
Muting Threshold:
AM TUNER SECTION
Tuning Range:
Antenna:
Intermediate:
Frequency:
Usable Sensitivity:
Signal-to-noise Ratio:
Harmonic Distortion:
Selectivity:
16.1 dBf, 3.5 wV (mono)
36.1 dBf, 35 uV (stereo)
10.3 dBf, IHF 1.8uV
75 dB (mono)
70 dB (stereo)
at 100 Hz
0.15 % (mono), 0.2 % (stereo)
at 1 kHz
0.1 % (mono), 0.15 % (stereo)
at 6 kHz
0.15 % (mono), 0.2 % (stereo)
40 dB at 100 Hz
45 dB at 1 kHz
35 dB at 10 kHz
30 Hz—15 kHz+1 dB
60 dB at 400 kHz
1.5 dB
50 dB
45 dB
90 dB
75 dB
65 dB
40 dB
Approx. 18 nV, 25 dBf
530 kHz — 1,610 kHz
Built-in ferrite-rod antenna,
External antenna terminal
450 kHz
300 nV /m, ferrite-rod antenna
100 vV, external antenna
at 1,000 kHz
50 dB at 50 mV/m
0.5 % at 50 mV/m, 400 Hz
35 dB at 10 kHz
MODEL IDENTIFICATION
— Specification Label —
US model:
Canadian model:
FM STEREO / FM—AM_ RECEIVER
MODEL NO. STR—V25
FREQ RANGE: FM 87.5-108MHz AM530-1610 KHz
iF :FM 10.7MHz AM 450 KHz
SERIAL NO.
AC 120V_ 60Hz
AC 120V_ 60Hz
80w
720W

STR-V25
SECTION 1
OUTLINE
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STR-V25
SECTION 2
DISASSEMBLY
2-1.
REMOVAL
Note:
Follow
the
disassembly
procedure
in
the
numerical
order
given.
TOP COVER
top cover
top cover screw
left
side
board
ass’y
: :
-
(Canadian
model)
A
iia
sipaihr
a
”
FRONT PANEL
O BVTT3x6
front
panel
assy
@
BVTT3
x6
BOTTOM PLATE
PTPWH3
x
6
@
P
O
PTPWH3
x
6
@
PTPWH3
x
6
4
Photo : US model

STR-V25
2-2, DIAL CORD STRINGING
1. Preparation
9-911-825-32
Cord, dial; 0.3mm dia g
/ \
whe / ti Crimp the eyelet
and then apply
gh
locking
compound.
ws : ‘1394mm___ -
») (55 inches)
[i = OMT: ——_—_
4h 5 —6mm .
2. Stringing
1). Turn the tuning capacitor shaft fully clockwise,
and set the dial drum to the position as
illustrated.
2). Follow the stringing procedure in the numerical
order given. °
® Receive a broadcasting-station signal
and set the dial pointer to the
frequency of the station on the dial
scale.
® After stringing,
(7) String below apply suitable
ee the dial pointer guide. locking compound.
o>
= sh
Lr
ee
,
\
°
7 ~~ o 7 : vs | dial pointer
@
two
and
half
ZA
BS.
‘iki
ass
oS
turns > Z ara
: 4 ~/ VU >
Ry ea
5) —= i
§ aS
@ String below
SQ
(4)
three
turns
the
lead
wires.
dial
drum
|@
one
turn}
r
——@ E
°
@ Hook the spring
to the boss.
®
ete eceae
half turns
O (inch)
STR-V25
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION |
FM Discriminator Alignment 1 Setting:
MODE switch:
MONO
VOM
frange: 2.5 V de}
Procedure:
di Detune the set.
2, Adjust the red core (primary-side) of IFT801
for 0 V dc reading on VOM.
17
/C8071 Dio
9 Note: Repeat the secondary-side and primary-
side adjustments several times.
—c-
R832
0807 —"°& ca02
lFT80O1
(primary-side : red)
tuner board
IFT807
(secondary-side : black)
FM Discriminator Alignment 2
Setting:
MODE switch: MONO
FM
rf
signal
distortion
generator
meter
FM antenna REC OUT
Carrier frequency: 98MHz terminal
Output level: 1 mV (60 d8)
Modulation: 400 Hz, 75 kHz deviation
(100 %)
Procedure:
Adjust the black core (secondary side) of
IFT801 for minimum distortion.

STR-V25
STR-V25
Signal Indicator Level Adjustment
Setup:
MODE switch:
FREQUENCY COVERAGE ADJUSTMENT,
TRACKING ADJUSTMENT and
IF ALIGNMENT
VCO Adjustment
MONO
A)
Regular
Method
The
front-end
section
has
been
carefully
FM
rf
adjusted
at
the
factory,
so
the
adjustment
is
signal
unnecessary
in
the
field.
generator
Setting:
FRONT-END SECTION
MODE
switch:
:
Procedure:
FM rf signal
FM antenna
generator
terminal
Carrier frequency: 98MHz
Modulation: 400 Hz, 75kHz deviation
(100%)
Output level: 1mV (60 dB)
Procedure:
Tune the set to 98 MHz and adjust RT802 so
that all signal elements light up. (See figure
below.)
—
co = ae green lamp
lights up
5
4 2 3 4
FM antenna
terminal
Carrier frequency: 98MHz
Modulation: 400 Hz, 75 kHz deviation
(100%)
1mV (60 dB)
Output level:
4
FM Muting Level Adjustment
Setting:
MODE switch: STEREO
MUTING switch: ON
Procedure:
FM rf signal VOM
generator fac range)
tuner board
frequency counter
1.
2. Adjust RT101 for 76 kHz + 100 Hz on the
counter.
Tune the set to 98 MHz.
FM Stereo Separation Adjustment
FM stereo
signal generator
output channel
L-CH L-CH (A)
Adjust
RT102 for
minimum
reading
VTVM
connection
VTVM
Setting:
reading
(dB)
MODE switch: STEREO
MUTING switch: ON
FM antenna REC OUT
terminal
B) Simple Method
Carrier frequency: 98MHz
Modulation: 400 Hz, 75 kHz deviation
(100%)
10 wV (20 dB)
Procedure:
1. Tune the set to the FM stereo broadcasting
signal.
Output level:
Procedure:
1. Tune the set to 98 MHz.
2.
Turn
RT801
and
stop
it
just
when
the
VOM
indication
suddenly
decreases.
2. Turn RT101 clockwise or counterclockwise and
memorize the lighting-up range of the stereo
lamp.
FM rf stereo
Signal
ma
generator
©
©)
Adjust
RT102 for
minimum
reading.
3. Receive a signal stronger than the muting level.
Confirm that the ACUTE SERVO LOCK lamp
(green) lights up. (See figure below.)
3. Secure RT101 at the center of the lighting-up 0.01 HF
range of both turns as shown below.
center of lighting-up ranges
FM antenna
terminal
REC OUT
lighting-up range
L-CH Stereo separation: (A) —
R-CH Stereo separation: © —
The separations of both channels should be
equal.
ry
LOCKED
ACUTE SERVO LOCK
Carrier frequency: 98 MHz
Output level: 1 mV (60 dB}
Modulation:
Audio (400 Hz}: 33.75 kHz deviation (45%)
Pilot (19kHz): 7.5kHz deviation (10%)
The green lamp at the
center lights up.
=7— —8—

AUDIO SECTION
Note 1. DC bias and DC balance adjustments should be
performed about five minutes later after the
POWER switch is turned ON.
DC Balance Adjustment
(with no signal input)
VOM
{de range)
SPEAKER L-CH (R-CH)
RT652
(R-CH)
RT602
(L-CH)
US
model
RT651 RT601
(R-CH) (L-CH)
DC Bias Adjustment
(with no signal input)
— L-CH —
Adjust RT601 for 20mV
dc reading on VOM.
+ =
VOM
(de range) re
TI
power amp
board
STR-V25 STR-V25
2. Repeat DC bias and DC balance adjustments two
or three times.
Adjust
RT602
(L-CH)
and
RT652
(R-CH)
for
OV
dc
reading
on
VOM.
RT602
(L-CH)
RT652
(R-CH)
Canadian
model
— R-CH —
Adjust RT651 for 20mV
dc reading on VOM.
VOM
aa (de range)
+
Rey
,
For
Note on Schematic Diagram:
@
All
capacitors
are
in
uF
unless
otherwise
noted.
pF
:
pur
SOWV
or
less
are
not
indicated
except
for
electrolytics
and tantalum.
@
All
resistors
are
in
ohms,
%W
unless
otherwise
noted,
kQ : 10002, MQ : 1000k2
° f+ : nonflammable resistor,
e A: internal component.
e [7] : panel designation.
e@ (~~) : adjustment for repair.
e : B+ bus.
e@ == —e=: B— bus,
®
Voltages
are
de
with
respect
to
ground
unless
otherwise
noted,
®
Readings
are
taken
under
with
a
VOM
(20kQ/V),
no mark: { FM section (FM stereo}
’ {AM section (detuned)
( } : FM (detuned)
@
Voltage
variations
may
be
noted
due
to
normal
pro-
Cc
duction tolerances.
@ Switch
Ref.
No.
|
Switch
Position
§301-5, 6 MUTING OFF
$501-1 to 3 | PHONO ON
$502-1 to 4 | FM OFF
$503-1 to 4 | AM OFF
$504-1 to 3 |} AUX OFF
$505-1 to 4 | TAPE 1 OFF
S506-1 to 4 | TAPE 2 OFF
$507-1 to 4 | TAPE COPY 1—=2 OFF
$508-1, 2 MODE STEREO
$509-1,2 LOUDNESS OFF
|
$901-1
to
3
|
POWER/SPEAKERS
POWER
OFF
Qa
a
—~10—

2d. pF : wuF
electrolytics
‘wise noted.
‘ss Otherwise
™).
normal pro-
tion
{+ OFF
Replacement Semiconductors
For
replacement,
use
semiconductors
except
in
(
).
Q101,
103
Q702,
705:
2SK34
(2SK34C)
Q104,
201
202, 609
a659
:
2SC1364
(2SC1815)
:
rae
0612-616
°
SGD
Q803-—807
Q811
Q707: 2SD809
letter side
0102, 610 |
Q660,
706
|
:
2SA1027R
(2SA1015)
{Ey
a80s—810
i
A
&
Q611,661 : 2SA1049
EC
1€101: wPC1161C
1C201: 4PC1178C
C801: uPC1167C
16 151413121110 9
Q601, 651: 2SC2725
12345878
(Top view)
1
23 af qT
7
26 1C401, 451: M5214L
35
3
4
5
63
Q604, 654: 2SC1986D (2SC1827)
D101—103 |
D601
D603, 604
D651 : 181555
D653
D801, 802
D805, 807 |
Q605, 655: 2SC1914A | 607,657: 2SA850 Deas
Q606, 656: 2SC1735 D701—706 | : 10E2
D201: HZ11B2L
EY cathode
B
E
BCE
D303-—307 |
D309 |
: SLP241B
Q701: 2SC1986D (2SC1826)
D709: S4VB40 (S4vB)
iS)
co Ge
I
EBC
STR-V25
STR-V25
Q704: 2SB731
letter side
Cc
SECTION 4
DIAGRAMS
4-1.
MOUNTING
DIAGRAM
—
Conductor
Side
—
(Canadian
Model
:
Power
Amp
Board)
: [ POWER AMP
|
~L2v¥FQB6O
%
REI3 : eyes my
1C301:
LB1416
ogolig
=
a4
fy,
i
|
REI,
270
al
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| reat 100. if
1234567 |
(Top view} |
1C501: NJM4560D |
1C802: uPC4558C |
8765
|
1234
(Top
view)
|
|
D707:
EQB01-12Z2
(EQA01-12R)
|
:
D708:
EQB01-05
(EQA01-05R)
|
;
loge
sap
ae
|
ayo
te
Serato
oa
3a
a
:
Bae
ae
eg
OEM
cathode
|
2
murat
xe
=
woe
©
$5
Cog
Ove
> ' BOY os
| 3>
D301,
302,
308:
SLP141B
|
vel
fret
.
ee a
| @) Pout
| PLSO!
pee
ey
ee
en
eee
>
:
ors
_f
snesdl
7"
are iow M
Y = CNJSOI
= UNS —
23 0
RED a
D602,
652:
SV04S
e@
[:
indicates
side
identified
with
part
number.
ae
|
3
R901
3.3M(1/2W)
ee
:
B
+
pattern
=
r
© meaner © signal path
cathode
©
mee
meee:
L-CH
signal
path
© qemeon mem : R-CH signal path
D804, 806: MV12N
~12—
CHASSIS
GROUND
[ _ CANADIAN MODEL

STR-V25
Q704: 2SB731
letter side
.705: 2SK34 (2SK34C)
D
G Ss
/
SGoD
Q707: 2SD809
letter side
LY es
yD
| ‘
cB
E
1C301: LB1416
1C101: wPC1161C
1C201: wPC1178C
1C801: uPC1167C
14131211109 8
16151413121110 9
1234567
(Top view}
12345878
(Top view)
1C501: NJM4560D
1C802: uPC4558C
C401, 451: MS214L
8765
1234
(Top view)
D707: EQB01-12Z (EQA01-12R)
D708: EQB01-05 (EQA01-05R)
D101—103 ;
D601
D603, 604
D651
D653
D801, 802
D805, 807
D605 j
D701—706 {
D201: HZ11B2L
cathode
cathode
181555
10E2
D301, 302, 308: SLP141B
303-307
|
»
SLP241B
D602,
652:
SVO04S
309
|
cathode
cathode
anode
>t
D804, 806: MV12N
‘709: S4VB40 (S4VB)
cathode
a
1 i 34
t 4
anode
11-
STR-V25
SECTION 4
DIAGRAMS
‘
STR-V25
4-1.
MOUNTING
DIAGRAM
—
Conductor
Side
—
(Canadian
Model
:
Power
Amp
Board)
RIS 1200,
gol Id \
R610, ,, 270
v os
615-5 200
lev
33V
3 R665 reg 200P
0655 9983 ape 208
R660,.270
270p..
B3V
E 2k}
Wa ve G59 2k
i247 RSE yA sary O55, 27
REST 4? 7
A
ig
ra)
Y
eee a oon i oe : °
R707 1 ee
& he Ae :
nity] ; :
33
8103
peg
OlN/M
aA
F701
2.58
A | BLY...
|
r-
<3,6
<3>—
—~<3>—
a
23>—
23
|
vetl
fret
SS
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