Sony ST-S222ES User manual

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SPECIFICATIONS
FM tuner section
Tuning range. 87.5 MHz — 108 MHz
Antenna terminals
75 ohms, unbalanced
Intermediate frequency __
10.7 MHz
ie cece ee ete To oe
| (at 40 kHz\ |
| \devia: tion / |
Sensitivity | at 46 dB quieting |
| 17.3 dBf, 2 uV |
| | (mono) |
| | 37.9 dBf, 22.5 pV |
| | (stereo) |
| Usable sensitivity | 10.3: dBf, 0.9 uV |
| | (IHE) |
o i (S/N = 26 dB) a
| Signal-to-noise ratio | | 83 dB inno) |
| 79 dB (stereo) |
| Harmonic distortion | 0.01% iene) |
| at 1kHz | 0.03% (stereo) |
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| IM distortion 0.01% (mono) |
| | 0.03% (stereo) |
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Separation
at 1kHz | os. de |
—— a
Frequency response) 40 Hz - 12 5 kHz $2 a .2dB |
| 30 Hz - 15kHz +§-ed
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Selectivity | at 400 kHz iat 300 KHz
_ 6048 | 25 dB |
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Cessna aR ERSIRRE NO MENS SACHEM
MICROFILM
Capture ratio 1.0dB
AM suppression ratio
65 dB
image response ratio
60 dB
iF response ratio
120 dB
Spurious response ratio
100 dB
RF intermodulation
65 dB (IHF), 80. dB (2.4 MHz)
Muting threshoid
Approx. 30 dBf, 18 uV
Output level/impedance
at 75 KHz deviation
750 mV,.1:7 kilohms
— Continued on next page —
SAFETY-RELATED COMPONENT WARNENG!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
A ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY oe
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

$T-$222ES
AM (MWILW) tuner section General
System PLL quartz-locked digital synthesizer
system
FM stereo, FM/AM super-heterodyne tuner
Power requirements
AEP mode: 220 V ac (or 240 V ac adjustable by
authorized Sony personnel), 50/60 Hz
UK model: 240 V ac (or 220 V ac adjustable by
authorized Sony personnel), 50 Hz
Power consumption
12 watts
Dimensions Approx. 430 x 80 x 340 mm (w/hi/d)
(17 x 33/4 x 107/s inches)
including projecting parts and controls
Weight Approx. 4.2 kg (9 Ibs 4 02)
Accessories supplied
Ribbon antenna (1)
Connecting cord (1)
Layout-free AM antenna (1)
Station label (1 set)
Antenna connector (1)
531 -— 1602 kHz 153 - 344 kHz
(9 KHz step)
530 - 1610 kHz
(10 kHz step)
Layout-free AM antenna
External antenna terminal
Tuning range
Intermediate
frequency
Layout- 300 pV/m 700 pV/m
free AM (at 999 or (at 230 kHz)
antenna 1,000 kHz)
450 kHz
Usable
sensi-
tivity
External
antenna
30 pV
(at 999 or
1,000 kHz)
Signal-to-noise ratio 50 dB (50 mV/m)
0.5% (at 60 mV, 400 He
Selectivity 40 dB (9 kHz) 40 dB (9 kHz)
45 dB (10 kHz)
200 pV
(at 230 kHz)
— MODEL IDENTIFICATION —
(Specification Label )
SON Y: MODEL NO, ST-S222ES
FM STEREO/FM-AM TUNER
MLL
AEP model: AC 220V~ 50/60Hz 12W
UK model: AC 240V~ 50/60Hz i12W

FUNCTION OF CONTROLS
jm POWER Y¥@ TUNING
K® TUNING MODE
4
MUTING/MODE
S$T-S222ES
‘® MEMORY
jm MEMORY SCAN
@ POWER switch
Depress to turn on the power. To turn the power off,
press the switch again.
© TUNING button
Press the left side (—) to go to a lower frequency and
the right side (+) to go to a higher.
During automatic tuning: Press to start automatic
frequency scanning. The frequencies below or
above that shown on the display window will be
scanned automatically until a signal is received.
To resume scanning, press the button again.
During manual tuning: Keep pressed to change the
frequency continuously until the desired frequen-
cy is received. The frequency figures will change
rapidly. Successively press and immediately
release the button to change the frequency slowly.
© TUNING MODE button
Select a tuning system — MANUAL or AUTO.
The selected tuning system will be indicated in the
display window.
© Band selector
Selects the desired band: FM or MW, LW. The selected
band will be indicated in the display window.
@ MUTING/MODE button
This button serves the dual purpose of an FM mode
and FM muting switch. Normally press this button so
that the MUTING indicator illuminates to eliminate
FM interstation noise while tuning from station to
station. To tune in very weak FM station, press this
button again so that MUTING indicator goes off. FM
station is received in monaural mode.
@ MEMORY button
Press to operate memory circuit. The MEMORY in-
dicator will appear in the display window for a few
seconds indicating that the memory circuit is stan-
ding by.
@ MEMORY SCAN button
Press to automatically scan the stations memorized
on the station preset buttons.
© Station preset buttons and station identification
windows
To call up a memorized station, press the appropriate
button. Station labels (supplied) can be placed in
these windows.
$T-S222ES
© Tuning mode indicators
The
tuning
system
selected
by
the
TUNING
MODE
button is displayed.
@ STEREO indicator
This
indicator
will
light
when
an
FM
stereo
program
of
sufficient
signal
strength
is
tuned
in
with
the
MUTING/MODE button pressed.
@ MEMORY indicator
When
the
MEMORY
button
is
pressed,
the
MEMORY
indicator
will
appear
for
a
few
seconds
indicating
that the memory circuit is standing by.
® TUNED indicator
This
indicator
illuminates
when
a
sufficiently
strong
signal is tuned in.
® MUTING indicator
This
indicator
illuminates
when
the
MUTING/MODE
button is pressed in FM reception.
@® Station preset button indicator
When
the
station
preset
button
is
pressed,
a
figure
from
1
to
10
corresponding
to
the
pressed
button
will
appear.
® Band/frequency-display
Permits
reading
the
received
frequency
at
a
glance
from the figures.

1-1.
BLOCK DIAGRAM
AEP ,UK MODEL
AM
L70!
:
ST-$222ES
SECTION 1
OUTLINE
_] L102 IFTIOI
FM
Ie
RTI04
FM
TRACKING
DISTORTION
ADJ
' FM MIX AMP t CFI0I FM IF AMP CFIO2 FM IF AMP
Q105 | 1 Q106,107 £ Q108, 109
| | el =
ee ay a8
LI05 ©
C162
MONO DIST
CORRECT
BUFFER Qil2
Q104
FM OSC
Q103
B+
(30V)
0204
YA
205 ¢3
T301_—; T303 D203
LW D302-A LW OSC STEREO
ANT LW ON/OFF
4 ie SWITCH
0305 ;
7304
MW OSC
L301 Hs MW ON/OFF
|
|
SWITCH
0304
0000000009000 0
MW
joe
AUG
0302,303
PLL LPF
Q40!,402 H
or
4 PLL REF FREQ
6)
9501 46
(16) PLL 3
IC90!
FM/AM
SELECTOR
Q405
FM/AM SWITCH
0406
RTIOI
RTIO2 Z
FM MUTING ADJ
CONTROLLER
5 1C50I
B+
(5.6V)
24
D501 ty
Ll
@®
8
|
D510 2) LATCH | — 22,54 — 60) —~60)—~G)
i 1C502
O
X50!
7.2MHz
S511
$50! $502 $503 $504 $505 MU TING/MODE $514 S516
foie) 2a [4] 5] 2 [—]
v5
$509 $5i0 $513 $515 S5I7
FM MW/LW MERORY SCAN
$506 S507 $508
Ce} C7) Ce) (2) [9]
FM IF AMP ihe es PLL DET
QO
C102 D108
ST-$222ES
B+
PLL DET
IC103
(1/2)
‘
IFTIOS
FM NULL
PLL DET
Qu!
CNJ70OI
2) 6) Steen
RT20I
SEPARATION
AM AUTO STOP ADJ
POWER ON
MUTING
Q60!
REGULATOR
IC60)
MUTING
Q201 ,202
4) (5)
ADJ 0203
D603
B+ REGULATOR
(45V) 0603
PT7OI $70!
POWER
D605 TRANSHGRMER LOWER]
O00 9
POWER OFF
MUTING
Q602 CNP7OI
-AEP MODEL
D603 D607
“— UK MODEL

$T-$222ES
SECTION 2
DISASSEMBLY
TOP COVER REMOVAL
Remove four top cover screws.
FRONT PANEL REMOVAL
Remove six screws securing front
panel.
Note: Follow the disassembly procedure
in the numerical order given.
TUNER BOARD, PRESET BOARD (A/B), LED BOARD
PC board support
ri
* Remove tuner board while
2 pushing pawl in the
direction of arrow.
QO BVTT3x6
@ BVTT3x6
OQ BVTT3x6
tuner board
preset (A) board

ST-$222ES
SECTION 3
ADJUSTMENTS
FM SECTION
FM TRACKING ADJUSTMENT
FM FREQUENCY COVERAGE ADJUSTMENT
FM rf
Signal
generator
FM rf
signal
generator
OUTPUT
FM ANTENNA
terminal (7§Q)
1. Adjust for a maximum reading on VTVM.
frequency adjustment VOM
indication part reading
87.5MHz L101, L102 maximum
108.0MHz CT101, CT102 maximum
87.5MHz | 2.1 +0.3V L103
108.0MHz | 8.0+0.3V CT103
frequency | reading on | adjustment
indication VOM part
VTVM
(de range)
TP 104
test point
STANDARD SIGNALS FOR ADJUSTMENT:
FM rf Stereo Signal
Carrier frequency: 98MHz
Modulation: Audio 400Hz
16.25kHz deviation (40%)
Subchannel
16.25kHz deviation (40%)
Pilot 19kHz
7.5kHz deviation (19%)
FM rf Monaural Signal
Carrier frequency: 98MHz
Modulation: 400Hz, 40kHz deviation (100%)

Discriminator Adjustment
@ Procedure:
FM stereo rf VOM
signal generator (dc range)
i
oo
Output level: 10mV (80dB) FM ANTENNA
terminal (75Q)
A) BALANCE
VOM (dc range)
LPF101
TP102
D | rer08
test point
test point
1. Turn FM rf signal generator off.
2. Short TP103.
3. Adjust RT103 so that VOM reads 0 +50mV.
RT103
TP102
TP103
B) Primary Side (NULL)
@® Procedure:
VOM (dc range)
Carrier frequency: Q98MHz
Modulation: 1kHz
Output level: 10mV (80dB)
test point
Note: Repeat primary and secondary adjustments two or
three times.
1. Detune the set by pushing the TUNING (+,
—) button.
Turn the core (primary side: Black) of IFT105 for
OV reading on VOM.
IFT 105
ST-$222ES
ST-$222ES
C) Secondary Side (DISTORTION)
@ Procedure:
IF BAND: WIDE
MODE: MONO/STEREO
FM stereo rf distortion
signal generator meter
Output level: 10mV (80dB)
FM ANTENNA OUTPUT
terminal (75Q)
1. With MONO signal
Adjust CT104 so that distortion meter reading
becomes minimum (0.06% or less).
Note: Make sure null point after making this adjustment.
2. With STEREO signal (for confirming STEREO
lamp lighting)
Adjust RT104 so that distortion meter reading
becomes minimum (0.09% or less).
Note: If specification is not met, turn IFT101 within
range of +90 (turn after making mark with
marker-pen or equivalent).
mark
RT104
/FT101
IFT101
Muting Width Adjustment
@ Setting:
MUTING/MODE switch: ON
@ Procedure:
FM rf signal
generator
Carrier frequency: 98MHz
Output
level:
10mV
(80dB)
OUTPUT
FM ANTENNA terminal
(752)
. Tune in 98MHz by pressing TUNING (+, —)
switches.
. Adjust IFT103 so that MUTING lamp goes on.
. Confirm that MUTING lamp goes on within
receiving frequency of 57 — 65kHz.
Note: Wait for about two minutes after turning the set on.
FM Muting Level Adjustment
e Setting:
IF BAND: WIDE
@ Procedure:
FM rf signal
generator
oscilloscope
Carrier frequency: 98MHz
FM ANTENNA terminal OUTPUT
(752)
1. MODE: MUTING ON
2. Tune in 98MHz by pressing TUNING (+, —)
switches.
3. Adjust RT102 so that muting level becomes
24 t3dB.
RT102
FM Stereo Separation Adjustment
@ Procedure:
FM stereo rf
signal
generator VTVM
FM antenna OUTPUT
terminal (75Q)
Carrier frequency: Q98MHz
Output level: 10mV (80dB)
Modulation:
Audio (1kHz): 16.25kHz deviation (40.6%)
Pilot (19kHz): 7.5kHz deviation (18.8%)
Sub-channel
(38kHz):
16.25kHz
deviation
(40.6%)
FM stereo
signal generator
output channel
VTVM VTVM
connection reading (dB)
Adjust
RT201 for
minimum
reading.
Adjust
RT201 for
minimum
L-CH Stereo separation: @) — ®)
R-CH Stereo separation: © - @®
The separations of both channels should be
equal.
IFT 103 RT201

VTVM
L re ee
[ ser | |
OUTPUT
TENNA terminal
TUNING (+, —)
NG lamp goes on.
» goes on within
(Hz.
fter turning the set on.
oscilloscope
, l=]
VQ"
[ ser | |
inal OUTPUT
752)
ing TUNING (+, —)
1uting level becomes
FM Stereo Separation Adjustment
@ Procedure:
FM stereo rf
signal
generator VTVM
FM antenna OUTPUT
terminal (75Q)
Carrier frequency: 98MHz
Output level: 10mV (80dB)
Modulation:
Audio (1kHz): 16.25kHz deviation (40.6%)
Pilot (19kHz): 7.5kHz deviation (18.8%)
Sub-channel (38kHz): 16.25kHz deviation (40.6%)
FM stereo
signal generator
output channel
VTVM VTVM
connection reading (dB)
Adjust
RT201 for
minimum
reading.
Adjust
RT201 for
minimum
L-CH
Stereo
separation:
@)
=
®)
R-CH
Stereo
separation:
©
a
©
The
separations
of
both
channels
should
be
equal.
IFT103 RT207
RT102
MW/LW SECTION
@ Setting:
BAND SELECTOR switch: MW/LW
AM rf signal
generator
Put the lead-wire
we antenna close to
the set.
30% amplitude
modulation by
400 Hz signal
MW/LW TUNED Level Adjustment
@ Procedure:
loop antenna
AM rf signal
generator
ferrite-rod
antenna
Carrier frequency: 999kHz (MW)
235kHz (LW)
30% amplitude modulation by
400H2 signal.
Adjust RT101 so that TUNED indicator goes
on with signal strength of 58dB/m.
Confirm that TUNED indicator goes on with
signal strength of 76dB/m.
indication VOM part
$T-$222ES
$T-$222ES
Layout-free
AM antenna
OUTPUT
Repeat the procedures in each adjustment
several times, and the frequency coverage and
tracking adjustments should be finally done by
the trimmer capacitors.
MW TRACKING ADJUSTMENT
Adjust for a maximum reading
on VTVM,
1,404kHz 603kHz
CT302 T302
RT101
. ee wee
“Sac
LW TRACKING ADJUSTMENT
Adjust for a maximum reading
on VITVM.
310kHz 170kHz
CT301 T301
T3017
indication VOM part

ST-S222ES ST-S222ES
SECTION 4
4-1. MOUNTING DIAGRAM DIAGRAMS
— Conductor Side —
@ Semiconductor Lead Layouts t 2 3 = o 6 u | 8 9 = Li. le
[FM
INPUT
|
(CHASSIS)
(COTS
1$S202-1 GL-5NG6 LA5665 2SK241-Y are wee See BOARD] ue ) —_———
cathode GL-5PR21 A AM FM
106,108
=
-
|coAXAL
112,107,109, IC102 = wore
4
V
W
i
BLK
long short CNJ 701 K WHT bs
anode os = -
cathode
anode
B ne
10E2 -
NJM4560D id On ZOU 301,302,303
28K 125-3
cathode 8765 2SK246-GR2 np lol iciol
ae Ec . IC103 iI
+ht i
(Top view)
anode
say C
TC9172P 2SA1175 302B , 301B
HZ30-2L TC9174P
fils
16151413121110
9
2SC710-13
ee
401,107,
106
A
HZ7A3L
[OUTPUT
BOARD)
603, C60
123458678
cathode Saas 306,305,304, 202
/ -
LA1265 aie a
LA3400
anode ;
2 28C535 602,60!
KV1226
a)
E IC20I
{Top view)
on ec, 103,102, 403
516 515
05,593,
anode 2 “PC1163H
\e)
snoae
10008
|
2SC634SP
.
10502
penne,
Cae
oe
(STEREO
INDICATOR
BOARD)
9
KV 1320
F
521,516,534
=T.
(CHASSIS)
X
i
405,406,501
.
OP
bias
:
=
-
G
MC931
pt,
Marking
side
view
3
=
more
"
501,503,505
507
e
Color
code
of
sleeving
over
the
end of
the
jacket.
508.504
506508
12
3
:
509,510
O—— : parts extracted from the component side. S51
r-
| t : indicates side identified with part number.
aaapes = signal path
ameasap © | -CH signal path
amos = R-CH signal path
e 22 %.: B+ pattern —— 2— — | 3—

ST-S222ES ST-$222ES
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
(CHASSIS)
(COTS
[TUNER BOARD)
BLK
0.9
0.9
0.9
0
1,2
0
0.9
0.51
7 5
: 5
5 5
5 a)
5 5
5 5
5 5
PT 70l
POWER TRANSFORMER
UK MODEL
AEP MODEL
(AC SWITCH BOARD]
|
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bell
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1
2 3
4
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AUTO MANUAL SIGNAL Ss ee
wow EP CD kHe I
FM LA ee MHz bowtie
SSI!
MUTING
/ MODE
LCDSO! LIQUID CRYSTAL DISPLAY
pe
14