Sony ST-S770ES User manual

ST-S770ES
SERVICE
MANUAL
Circuit System
Power requirements
Power consumption
MICROFILM
AEP Model
UK Model
SPECIFICATIONS
FM stereo, FM/AM super-heterodyne Dimension
tuner PLL quartz-locked digital synthe-
sizer system
UK model: 240 V AC (or 220 V AC
adjustable by authorized Sony person-
nel), 50/60 Hz
Other models: 220-230 V AC
(or 240 V AC adjustable by authorized
Sony personnel), 50/60 Hz
Weight
Accessories Supplied
20 watts
UK model
Approx. 430 x 95 x 372 mm ¢w/h/d)
(17 x 3-3/4 x 14-3/4 inches)
Other models
Approx. 470 x 96 x 372 mm (w/h/d)
(18-5/8 x 3-7/8 x 14-3 /4 inches)
UK model Approx. 5.8 kg (12 Ib 13 02)
Other models Approx. 6.4 kg |1 4 |b 2 02)
Connecting Cord (1)
FM ribbon antenna (1)
AM loop antenna (1)
Antenna connector (1)
Remote control cord (4-pin) (1)
Short screw (M4 x 8) (4) (for models other
than UK model)
FM STEREO / FM-AM TUNER
SONY.

ST-S770ES |
Tuning range 87.5-108 MHz
Intermediate frequency
Sensitivity | mono S/N 26 dB
10.7 MHz
10.3 dBf, 0.9 uV/75 ohms
| stereo S/N 46 dB
38.5 dBf, 23 uV/75 ohms
Usable sensitivity
Signal-to at 40 kHz deviation
noise ratio
10.3 dBf, 0.9 pV/75 ohms (IHF)
95 dB (mono)
86 dB (stereo)
Harmonic distortion
WIDE 0.008% (mono)
0.02% (stereo)
0.04% (mono)
0.08% (stereo)
NARROW
Separation at 1 kHz
Selectivity at 400 kHz
at 300 kHz
Output at 40 kHz deviation
65 dB
WIDE 80 dB
NARROW 90 dB
WIDE
NARROW 70dB
400 mV
Tuning range
Intermediate frequency
Usable sensitivity
AEP, UK, Germany models
MW: 531-1602 kHz (9 kHz step)
LW: 153-279 kHz (1 kHz step)
Italian model
MW: 522-1611 kHz (9 kHz step)
LW: 144-288 kHz (1 kHz step)
450 kHz
MW AM loop antenna 250 uV/m
External antenna 30 np V/m
LW AM loop antenna 700 nV/m
External antenna 200 nV/m
Signal-to-noise ratio 54 dB
Harmonic distortion 0.3%
Selectivity at 9 kHz: 65 dB (NARROW)
50 dB (WIDE)
— MODEL IDENTIFICATION —
(Specification Label)
SONY. mopetno. ST-S770ES IT model : AC 220-230V ~ 50/60Hz
pee CLUDED AM TUNER
LLLLLLLLLL LLL LLL LLL LL
EIN
SERIAL NO.
MADE IN JAPAN
AEP model :
G model :
UK model :
AEP model :
G model:
IT, UK model:
AC 220-230V ~ 50/60Hz
AC 220-230V ~ 50/60Hz
AC 240V ~ 50/60Hz
GOWLO
QZEESS
end
No Printed

TABLE OF CONTENTS
Section Title Page
SpecificatlOnsiecs. ies slelisscoseesietealdesiascbsebd ach Fateacs dl epsat gh eleeess 1
FOALtUPOS aio divecispecdeetevens oued cdaveccolecess sceceeueedseusbe Re ee eettteane ae 3
1. GENERAL
1-1. Location and Function of Controls ......... eee 4
1-2. Broadcast RECEption ...........:cesscceeseesereeeeeeessereeeeees 5
1-2-1. Tuning in Manually .0..... cece sees eeseneeeserseeeeeeeee 5
1-2-2. Tuning in Automatically ..........csessseecseseseeseeees 5
1-2-3. Storing station frequency into memory ............ 6
1-2-4. Receiving a Stored Station oe eee eeeeeeees 6
1-2-5. Scanning Stored Stations Automatically .......... 7
1-2-6. Scanning Stored Stations Manually ..............0. 7
2. IC PIN FUNCTIONS
2-1. 10601 (u4PD75108CW-A76) Pin Functions ............. 8
3. BLOCK DIAGRAM .............:2:ccccceeeeeseeseeeeseeeeneerenes 11
4. ELECTRICAL ADJUSTMENTS ............. cece 13
5. DIAGRAMS
5-1. Printed Wiring Boards ...... eee esseseneesseeseeeseeeees 17
5-2. Schematic Diagram ..........cccseeeecesssesesseeeeseeseeees 21
5-3. Schematic on Waveforms .....ccecssecseeeseeeseeeeees 24
5-4. IC Block DiaQrarn .......eeeeeseecceeeeeeseeesesetteeeereenseeeees 24
5-5. Semiconductor Lead Layouts ....... eee seseeeseeeee 26
6. EXPLODED VIEWS
6-1. CABINET ASSEMBLY ....... i eeceeeesesscesesseseeteesrereees 27
6-1. CHASSIS ASSEMBLY ....... eee eeseeseseeesereeerereees 29
7. ELECTRICAL PARTS LIST 0.0.0... cc ssceecseeesetcensaeeee 31
« Note:
G: Germany model
IT: Italian model
| ST-S770ES
Features
Precise Tuning with the large knob
The detected revolution of the tuning knob is under digital-
control so that you can tune in the correct frequency and
stored station easily.
This system employs a variable muting function that adjusts
itself to the rotation speed of the TUNING knob and changes
the muting time. This function realizes a feeling which is
very close to that of an analog type tuner.
Direct comparator technology
An employed PLLIC allows the comparison frequency to be
as high as the channel spacing frequency, thus eliminating
the tendency of a low comparison frequency to slip into the
audio range and degrade the signal-to-noise ratio.
Free from digital noise
When the tuning completes, the clock oscillator of the micro-
computer stops. Since the received signal passes through
only analog circuits, you can enjoy the pure sound without
an interference.
NEW (-Me) olalaalrccrmccrearilel(ere hg
The WOIS (Wave Optimized IF System) which makes the IF
waveform optimum shape in stereo and monaural mode
and the WODD (Wave Optimized Direct Detector) which
forms the VCO oscillation waveform of the PLL detector
ensure low distortion sound.
Program function
Using the program function, you can automatically tune in
up to four stations which have been memorized in any
sequence you want. Stations will be received one by one as
the power is turned on and off by an optional audio timer.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK A\ OR DOTTED LINE
WITH MARK A\ ON THE SCHEMATIC DIAGRAMS 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.

ST-S770ES |
1-1. LOCATION AND FUNCTION OF CONTROLS
ESS
iEle[vleelol=
SECTION 1
GENERAL
This section is extracted from
instruction manual.
—_ are Ss —_ f ps
Velalielle] fe} fy] fe] El
Display window
POWER switch
CAL TONE (calibrating tone) button
Press this button to obtain a 400 Hz, 50% modulated
signal for adjusting the recording level on a cassette
deck. “CAL” will appear when a 400 Hz calibrating tone
signal is provided. To deactivate the calibrating tone
circuit, press the button again.
TUNE MODE (tuning mode) button
MUTING button
PRESET buttons
TUNING/PRESET button
TUNING/CHARACTER knob
SHIFT button
MEMORY button
Band selector
FM MODE button
Auto Stereo: Normally, select this mode (by making
the HI-BLEND and MONO indicators disappear from
the display window) when you tune in a strong FM
broadcast.
HI-BLEND: Select this position when the high-
frequency sound is noisy in the FM band. The high-
frequency noise will be reduced, but this lowers the
stereo effect.
MONO: Select this position when you tune in a very
weak or noisy FM station. Although the sound will
come out in monaural the noise will be greatly re-
duced.
14
16]
— aay :
Ss ]e]E]S] [elle] [SR ]fe]
IF (intermediate frequency) BAND button
To prevent inter-station interference, press this button.
The NARROW indicator apears on the display and the
selectivity is improved.
DISPLAY button
ANT ATT button
CHARACTER button
Press this button when you record an FM stereo pro-
gram using the Dolby NR* (Noise Reduction) system.
The MPX FILTER indicator appears.
This filter cuts off the 38 kHz subcarrier signals, which
may otherwise interfere with proper operation of the
Dolby NR* (Noise Reduction). If your deck has an MPX
FILTER button, use that button rather than the button of
this tuner.
* Dolby noise reduction manufactured under License
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol [{U] are trade-
marks of Dolby Laboratories Licensing Corporation.
[17] DISPLAY MODE button
[18] PROGRAM switch and CHECK button
[19] ANT button

1-2. BROADCAST RECEPTION
1-2-1. Tuning in Manually
MUTING
\F BAND
ANT ATT.
Select the desired band with the bnad selector.
If the AUTO indicator appears on the display, press
TUNE MODE. The AUTO indicator disappears.
Check if the TUNING indicator appears on the display.
If not, press TUNING/PRESET.
Find the desired station by turning the TUNING knob
toward ® for higher frequencies or < for lower fre-
quencies.
For FM stereo reception
Normally, press MUTING.
MUTING indicator appears on the display. To tune in a
very weak FM station, press again to reset it. The MUTING
indicator goes off.
To receive a weak FM broadcast
Set MUTING off (press MUTING so that the MUTING
indicator disappears from the display window), and if it is
still noisy, set FM MODE to the MONO mode.
To tune in only stations with strong signals
Press ANT ATT to make the ANT ATT indicator appear.
When the desired station is interfered with adjacent sta-
tions
Press the IF BAND button so that the NARROW indicator
appears in the display window. In this mode, the selectiv-
ity increases so that interference-free sound is obtained.
| ST-S770ES
1-2-2. Tuning in Automatically
(FM only for European countries, FM and AM for other countries)
Select the desired band with the band selector.
Press TUNE MODE so that the AUTO indicator appears
on the display.
Check if the TUNING indicator appears on the display.
If not, press TUNING/PRESET.
Turnthe TUNING knobtoward > for higher or < forlower
frequencies.
When automatic frequency scanning starts, release the
knob. Scanning stops when a signal is received. If the
signal is not the desired one, turn the knob again to
restart scanning.
To receive other stations
When the received station is not the one you want, turn
TUNING knob again.
To receive a strong FM broadcast
Normally, set MUTING on (press MUTING so that the
MUTING indicator appears on the display) to reduce noise.
Also, set FM MODE to the auto stereo mode. The unit
operates in the stereo mode for a stereo signal, and auto-
matically switches to the monaural mode for a monaural
signal. Ifitis still noisy, set FM MODE to the HI-BLEND mode.

ST-S770ES |
1-2-3. Storing station frequency into memory
Atotal of 30 FM/AM stations (Station names can stored only
twenty among of thirty stations) in any band can be memo-
rized.
Storing alli stations automatically
To preset the frequencies and other modes of 30 stations,
press the PRESET button 3 while pressing POWER.
To preset the frequencies, station names, and other modes
of 20 stations, press the PRESET button 2 while pressing
power.
Once they are presetted, they will be memorized. (Even for
1 month with the power off)
Storing one station at a time
1
2
Tune in the desired station.
Press MEMORY.
“MEMORY” appears in the window.
3
4
Press SHIFT to select the memory page A, B, or C.
Select a preset number with the PRESET button.
Repeat the above steps for each station to be stored in
memory.
Notes on storing
If you select an incorrect number, press the MEMORY but-
ton again and select the correct number.
If the MEMORY indicator disappeared, before you pressed
PRESET, press MEMORY again.
if the power remains off, the memory is maintained for ap-
proximately one month.
If a new station is stored over a preset station number, the
previously stored station is erased.
If you set the ANTENNA, ANT ATT, IF BAND, MUTING, FM-
MODE or the name of the station, they can be stored when
you press MEMORY and PRESET.
If the indicators on the display are not properly displayed,
1 Press POWER to turn off the unit.
2 While pressing PRESET “9” and PRESET “0”, press
POWER to turn on the unit.
This unit is reset to initial state and all of the stored stations
and settings are erased.
1-2-4. Receiving a Stored Station
Method A: When you know the preset number of the
desired station.
1 Press SHIFT to select the memory page A, B, or C (A, B
only if you have stored station names).
2 Select the desired number with the PRESET button.

Method B: When you don’t know the preset number of the
desired station.
1 Press TUNING/PRESET to make the PRESET indicator
appear.
2 Find the desired station by turning the TUNING knob
control toward » for higher numbered stations or < for
lower numbered stations.
1-2-5. Scanning Stored Stations Automatically
Press TUNE MODE to make “AUTO” appear and turn the
TUNING knob.
If scanning does not start
Scanning starts only when you turn the TUNING knob while
the code indicator is flashing. If the flashing has stopped,
press TUNE MODE again.
1-2-6. Scanning Stored Stations Manually
1. Press TUNING/PRESET to make the PRESET indicator
appear.
2. Press TUNE MODE.
AUTO indicator goes off.
3. Turn TUNING/CHARACTER, until desired station is re-
ceived.
| ST-S770ES

ST-S770ES |
SECTION 2
IC PIN FUNCTIONS
2-1. 1601 (uPD75108CW-A76) PIN FUNCTIONS
CLOCK START —*(1)
Not used.
REMOCON
Rotary encoder R1
Rotary encoder R2
AUTO STOP
Not used.
PGM
KEY LOCK
FM MUTE
TUNING
TUNING
LATCH
Not used.
DATA
CLOCK
POWER ON/OFF
SST 4
SST 3
SST 2
SST 1
ANT
RF MODE
Not used. { S-NAR
WIDE/NARROW
Not used. { oe
BLEND
HI-BLEND
MONO/AUTO
Not used.
Not used.
+5V
GND
Not used
> wo ao
KEY INPUT
KEY DIGIT
~<a— 4.19 MHz ceramic
RESET ~t— RESET
} DIODE SW
DIMMER
GRID CONTROL
LATCH 3
LATCH 2
LATCH 1
PURE LED
MW/LW
F/A } Not used.
CAL-TONE
Vpb MUTE

+ 1C601 SYSTEM CONTROLLER (uPD75108CW-A76) PIN FUNCTION
%1 Rotary encoder ratation detect
play changes cyclically as follows.
WIN 4.0 ms > Fully lit > Partially lit — Not Nee
The output ports change as follows.
%2 When the | DISPLAY MODE | key is pressed, the FL dis-
| ST-S770ES
Description
PURE LED (D701) ON/OFF output. “H”: ON (stop mode)
FL indicator tube grid control output (center grid 2G) (#2)
FL indicator tube grid control output (both sidesgrid 1G, 3G) (#2)
% When the } BAND| key is pressed, the output ports
change cyclically as shown in the table below.
Pin No.| Pin Name |I/O| ACTIVE Description Pin No.} Pin Name | I/O | ACTIVE
1 CLOCK | H Stop mode control input. 36 ha H MW/LW select output, “H”: MW, “L”: LW
START (1) When there is no key input continuously for 2 seconds and 37 PURE O H
the — iciba Nese ee Seals in the state 38 |LATCH1 O H FL driver (IC701) latch output
SURE ein) as nF sau eat anes SRG TRe 39 |LATCH2 | O H | FL driver (IC702) latch output
(2) When there is a key input, f releases the stop mode. = 40 | LATCH 3 O H FL driver (1C703) latch output
PURE (pin 37) goes “L”. 41 | GRID 0 L
2
|
N.C.
|
Not
used.
42
|DIMMER
|
O
L
3
|REMOCON
|
||
_f
{_
|
Remote
control
signal
input.
43
+
44
|
DIODE
0
H
Diode
switch
output.
4
|R1
||
_f
|_|
Rotary
encoder
rotation
detect
input
(#1)
45
[RESET
L.
System
RESET
input.
“L":
RESET
5
|R2
Rotary
encoder
rotation
detect
input
(#1)
X2
O
Clock
output
6 |AUTOSTOP| | & Auto stop signal input from IC251. “L”: when signal detect 47 |x Clock input (4.19 MHz)
7 48 -55| KEY DI(S1)| O H Key matrix output
. N.C. | Not used. 56-59|KEYINPUT| | H | Key matrix input
9
|PGM
L
PROGRAM
switch
(S661)
input.
“L”:
PROGRAM
60
-
63
|LEDA-LEDD|
O
Not
used
(pull
down)
10
|
KEY
LOCK
|
L
PROGRAM
switch
(S661)
input.
“L":
KEY
LOCK
re
Power
supply
terminal
(GND)
11 F-MUT 0 H FM MUTING output. “H”: MUTE
12 | TUN O H FM MUTING SENS select output. “L”: STOP, “H”: TUNING
13 | TUN O L: AM muting output. “H”: STOP, “L”: TUNING
14 | LATCH O H Signal meterdriver (IC705) latch output.
15 | NLC. I
16 | DATA QO H Display data output to FL driver (IC501, 701 - 703, 705)
17. | CLK O L Data transfer clock output to FL driver (IC501, 701 — 703, 705)
18 | POWER I H Power down detect input “H”: normal, “L”: power down
19 — 22) SST4-SST1| O H Not used (pull up)
ANT O L FM antenna select output. “L": antenna “A”. “H": antenna “B”
24 | RF MODE O H Antenna attenuator ON/OFF output. “L”: through, “H”: ATT
25 | S-NAR O H Not used (pull up)
26 |W/N O H Wide/Narrow select output. “L”: WIDE, “H”: NARROW
27 +| FILTER oO H Not used (pull up)
28 | BLD O H Not used (pull up)
29 | HI-B @) H HIGH BLEND switch (Q306) control! output.
30 | MONO/AUTO| O H Auto stereo select switch. “H”: AUTO STEREO
31 Not used.
32 | VoD - Power supply terminal (+5V)
33 | MUT O H Line mute output. “H”: MUTE
34 | CAL O L CAL TONE ON/OFF output. “L”: CAL TONE
35 |F/A O H Not used (open)
* TEST MODE
When the | SHIFT | key is held depressed and the
power is turned on, all segments in the FL display
light while the key is held, so simple checking can
be done.
a std li
Clockwise
Counterclockwise
FM MW LW
as a oa
nr a
41 pin GRID
42 pin DIMMER
~9-
-10-
When the | SHIFT | key is released, normal opera-
tion is restored.

ST-S770ES
FM
ANT
SECTION 3
BLOCK DIAGRAM
Q202,212
IF BYPASS SWITCHING
{for Adjustment}
PLL DET ————----+
FRONT END
(i MONO 1 per Weer D278-279 ora
vee is joz01 le202 aaas erat DBM PLL DET THD gayy
TM101 RY151 FM RE AMP ue Q102 Len MONO swiTCH Irreot apres FM IF AMP Tats IFT272 D275 PLL
Liot O101 D102 no : ‘ 4 IF IN MUTE af 3! a = ig r ee
{> : = : @) 2 : f 3! METER MUTE SENS : =a
152 = , : H eT L3i 0251,256 o
‘ ANTENA 2 =e
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RF MODE i ae 1 AV201 Q204
SELECT if t FM MONO IF TRAOUGH SWITCH
e SELECT SHITOH 4 : |
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cr202 —
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Q241 | (From 1C801 11pin
551,552 PLL a7 NARROW 1
PLL SYNTHESIZER 0501-503 NARROW SWITCH 215,218 0208
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AV303 BLEND SW
0407 0405 4g PILOT CANCEL AV309
nT MUTING AM/NARROW cau [AM ete
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(31n2
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LWON FROM REMOCON
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—-12-

SECTION 4
ELECTRICAL ADJUSTMENTS
Notes: Perform adjustment in the order given.
* Parts location diagram relevant to the adjustment.
Servicing Precaution
The AM RF block (FE401, FE451) section
! L103
has been carafully adjusted at the fac- | CT103 08
| tory. : |
| When it is worn out, be sure to exchange | Pilot Cancelt Tracking L102 woke, i Control Voltage
| it all with new sectior, because it is : Adjustment Adjustment | CT102 --—-—- Adjustment
| difficult to repair. :
eee
RV303 L301 1€202
asec ds cs as ws
\ \ 1C501
| i
aes sf] ers
J tFT201
ae ig 0 oom | [= mee
i
4
on
o-~
RV203
1¢c401 — j
al | Ra pe
/ SS eS IFT204
/ fe ©-—+— Rv2ai
/ / O-+—— avasi
{ J O-——- rvasz
ceo —} + ] | / | af + [| 1F251
co TP201 —
RV401 a7 NULL/PLE |1C272 | (C251
AM Meter Level ee Detect Distortion | TP271 | 1C271
Adjustment Adjustment cT271
1FT272 -—__—___
FM SECTION
FM RF SSG
1 kHz distortion
highpass meter
filter
Lf 1 [So
Rete ne, celisdl,
set
Ne tee)
FM ANTENNA OUTPUT
(75 Q)
» Standard signals for adjustment.
FM RF Stereo Signal
FM RF Monaural Signal
\FT/IF Distortion
Adjustment
FM Muting Level/IF
Narrow Gain Adjustment
IFT/IF Distortion
Adjustment
FM Meter Level
Stereo Operation
Adjustment
FM Muting Level/IF
Narrow Gain Adjustment
{}—-+— Muting Width
Adjustment
Carrier frequency : 98 MHz
Modulation : Audio 1 kHz, 16.25 kHz deviation (21.7%)
Subchannel 16.25 kHz deviation (21.7%)
Pilot 19 kHz, 7.5 kHz deviation (13.3%)
Carrier frequency : 98 MHz
Modulation : Audio 1 kHz, 40 kHz deviation (53%)
= coe
Control Voitage Adjustment
Procedure:
1. Turn the set to 108 MHz.
2. Adjust L104 for 21.0 +0.2 V reading on the VTVM.
3. Tune the set to 87.5 MHz.
4. Confirm that the voltage reading on the VTVM is
within 8.0 +1.0V.
VTVM
{dc range}
[ZI
pin (6) of 1C501
Tracking Adjustment
Setting:
IF BAND : NARROW
FM RF SSG
FM ANTENNA
(78 2)
OUTPUT
Procedure:
1. Tune the set to 108 MHz.
2. Adjust CT 101, CT102 and CT 103 for maximum read-
ing on the VTVM.
3. Tune the set to 87.5 MHz.
4. AdjustL101, L102 and L103 for maximum reading on
the VTVM.
5. Repeat the step 2 — 4 several times.
Muting Width Adjustment
Setting:
IF BAND : WIDE
MUTING switch : ON
FM RF SSG
=a I 5 %t o
FM ANTENNA (75 Q)
VTVM
{dc range)
7| 1€251] 49
pins @) and (70) of 1C251
Carrier frequency: 98 MHz
Modulation: FM RF Monaural signal
Output level: 10 mV (80 dBu)
Procedure:
1. Tune the set to 98 MHz.
2. Adjust IFT251 for OV reading on the VTVM.
~14-
NULL/PLL Detect Distortion Adjustment
Setting:
IF BAND : WIDE
MUTING switch: ON
VTVM
{de range)
| TP271
|
Procedure:
1. Tune the set to 98 MHz.
2. Short-circuit TP201 to the ground (The set turns
into IF through state.)
3. Set the SSG output to 80 dBu (10 mV).
4. Adjust IFT272 for 0 V reading on the VTVM (TP271).
(Null adj.)
5. Adjust CT271 for minimum distortion reading onthe
distortion meter. (PLL Detect Distortion adj.)
6. Repeat the step 4 and 5 several times.
7. Remove the short circuit of TP201.
IFT/IF Distortion Adjustment
Setting:
IF BAND : WIDE
MUTING switch: OFF
id ! VTVM
(de range)
pin (3) of 10203 !
Procedure:
1. Tune the set to 98 MHz.
2. Turn RV201 and RV202 to fully clockwise.
3. Set the SSG output to 40 dBu (100 nV) at monaural
modulation mode.
4. Adjust IFT201 for maximum reading on the VTVM.
(IF Distortion Pre adj. MONO)
5. Set the SSG output to 40 dBu (100 nV) at stereo
modulation mode.
6. Adjust IFT202 for maximum reading on the VTVM.
(IF Distortion Pre adj. * STEREO)
7. Adjust IFT101 for maximum reading on the VTVM
(IFT adj.)
8. Set the SSG output to 80 dBu (10 mV) at monaural
modulation mode.
9. Turn RV201 and RV202 to mechanical center posi-
tion.
10. Adjust IFT203 for the minimum distortion.
(IF Distortion adj. * MONO)
11. Set the SSG output to 80 dBu (10 mV) at stereo
modulation mode. (Lch only)
12. Adjust IFT204 for the minimum distortion.
(IF Distortion adj. * STEREO)
13. IF BAND: NARROW
14, Adjust RV204 for the minimum distortion.
(IF Narrow Distortion adj.)
Stereo Operg
Setting:
IF BAND:
MUTING s
FM RF SS
as
(
Carrier freq
Modulatio.
Output leve
Procedure:
1. Tune the se
2. Adjust RV24
FM Muting
Setting:
IF BAND :
MUTING g
FM RF SSG
(eb
CI
Carrier freq
Modulatio
Output lev4
Procedure:
1. Tune the s4
signal gen@
2. Turn RV25
suddenly a
level adj.)
. IF BAND:
. Turn RV20
suddenly a
Gain adj.)
Pw
FM Meter Le
Setting:
IF BAND :
FM RF SS
eee
Carrier freq
Modulatio
Output levé
Procedure:
1. Tune the s4
2. Adjust RV2
on the sig

| ST-S770ES
SECTION 5
P ; F :
DIA
djustment
Stereo
Operation
Adjustment
Pilot
Cancell
Adjustment
AM
SECTION
GRAMS
EG - WIDE a eats - WIDE Setting: * Semiconductor Location
MUTING
switch:
OFF
FM
BF
stereo
Ref.
No.|
Location
||Ref.
No.|
Location
||/Ref.
No.|
Location
: loop ante. TT
Bi ee se! Generator VTVM te8 D101 | C-20 D627 | J-22 0233 | D-18
D102 C-19 D628 1-22 Q234 E-18
AM RF SSG D103 | C-20 D651 | H-31 Q235 | E-18
D104 B-16 D671 C-28 Q241 D-17
(rk Dis1 | c-22 || D701 | G1 a251 | J-17
oO
1 FM ANTENNA (75 21) D152 C-21 D703 H-12 Q252 I-15
; FM ANTENNA Oo ‘, : D201 D-18 D901 E-20 Q253 1-15
Carrier
frequency:
98
MHz
(75
Q)
ne
pd
lois
D202
|
D-18
||
D902
|
E20
||
a254
|
1-15
Modulation: FM FF Stereo signal 400 Hz signal D203 G-17 D903 E-20 Q255 J-15
Output
level:
10
wV
(20
dB)
Carrier
frequency:
98
MHz
AM
!oop
i
a:
ai
pte
pee
vue
Procedure: A ci ahs eee ve ne antenna VTVM b242 | E-17 pg0s | F-20 a271 | J-20
1:
Tune
the
Sette
oe
MHA
utput
level:
m
HL
D273
1-20
D911
G-21
Q272
1-18
und
(The
set
turns
2.
Adjust
RV251
hat
the
STEREO
indi
p
dite:
D274
1-20
D912
G-21
Q301
F-23
5
just
so
thatthe
indicator
goes
on.
rocedure:
D275
J-19
D913
F-22
0302
H-28
10
mV)
1.
Turn
the
set
to
98
MHz.
=
D276
J-18
D914
F-21
Q303
F-23
che VTVM (TP271) FM Muting Level/IF Narrow Gain Adjustment 2. Adjust RV303 and L301 alternately for minimum
:
Setting:
reading
onthe
VTVM
andalso
tune
the
both
channel
as
nee
ene
ad
Sat
oe
rtion
reading
onthe
IF
BAND
:
WIDE
?
.
Fests
—
da
Beles
at
this
time.
AM
antenna
Pre
p279
|
J-18
=|)
p931
|
F-21
‘||
a306
|
C-24
istortion adj.) MUTING switch: ON eA PAE Ee Step eSeVc le) NGS: p301 | G-24 || p932 | G-20 || a308 | B-26
|
times.
FM
RF
SSG
deviesens
D302
G-23
1C201
D-18
Q309
B-25
201.
Stereo
Separation
Adjustment
p303
|
G23
||
ic202
|
E19
‘(||
0310
|
H-28
ae Setting: . D304 G-25 1C251 1-16 Q401 H-28
;
AM
Meter
Level
Adjustment
D305
|
G-25
C271
|
1-17
Q402
|
H-27
o——-0 IF BAND : WIDE
I ; Setting: D307 1-27 IC272 | 1-18 Q403 H-27
:
2
EM
RE
stereo
Canepa
D310
|
H-27
1C301
|
F-24
Q404
|
G-26
‘igital Goherstcr oie) arrier frequency: 216 kHz
FM
ANTENNA
OUTPUT
Vi
Modulation:
400
Hz,
30%
modulation
D311
H-27
1C401
F-27
0405
G-27
VT
VM
oe
D312
H-16
1C501
C-16
Q406
H-26
D313 1-28 1C601 J-25 Q407 G-26
‘de
range)
Carrier
frequency:
98
MHz
Procedure:
D401
F-25
1C602
|-27
Q408
H-27
| Modulation: FM RF Monaural signal 1. Set AM RF signal generator so that the AM antenna D402 H-26 1C701 | G-4 0451 E-27
Output level: 12.6 uw V (22 dB) input level becomes 74 dBu/m (5 mV/m.)
FM
ANTENNA
OUTPUT
2.
Adjust
RV401
so
that
1-
10
indication
bars
light
up
oak
oe
on
ae
0462
Pe
O
Procedure:
(75
2)
en
the
signal
rieter
D601
-23
1C703
G-8
Q453
E-27
O
1.
Tune
the
set
to
98
MHz
and
adjust
output
level
of
‘
ae
=
ee
He
Se
Coe
signal generator at 25 dBu (17.8 pV). Carrier frequency: 98 MHz D604 1-23 ic911 | G-21 Q456 E-26
2. Turn RV252 at the position where the waveform Modulation: FM PF stereo signal
suddenly appears on the oscilloscope (FM Muting Output level: 10 mV (80 dBu) D605 1-27 Q101 B-20 Q457 E-26
level adj.) D606 1-27 Q102 B-18 Q458 E-27
ae en ees = sem | Jz oie | ey | Gan | Bi
100
wv)
at
monaural
4.
Turn
RV203
at
the
position
where
the
waveform
FM
stereo
VTvm
VTVM
D609
J-23
Q105
B-16
Q502
D-17
suddenly
appears
on
the
oscilloscope
(IF
Narrow
signal
generator
f
.
ading on the VTVM. Gain adj.) output channel | Connection neading (dB) De10 | J-23 a151 | B-23 a503 | D-17
)
D611
J-23
Q152
B-23
Q511
E-16
L-CH L-CH @®
1
(100
UV)
at
stereo
:
D612
|
J-23
Q201
|
C-17
Q521
|
D-16
eae
EN
Micrenbevol
Gdsient
D613
|
J-23
||
Q202
|
D-18
||
a522
|
E-16
ading
on
the
VIVM.
pass
ener
Means
R-CH
L-CH
Adjust
RV301
for
D614
J-23
Q203
E-18
Q551
E-16
O)
minimum
reading.
D615
|
J-23
a204
|
G-18
||
as5s2
|
F-16
2ading on the VTVM FM AF SSG R-CH R-CH © D616 | J-23 a205 | E-19 Q601 | K-27
D617 J-24 0206 G-19 Q603 H-27
D618 J-24 Q207 E-18 Q671 C-27
10
mV)
at
monaural
L-CH
R-CH
Adjust
RV302
for
D619
|
J-24
Q208
|
G-17
Q701
G-2
‘hanical
center
posi-
paladin
yedelng:
D620
|
1-27
a211
|
G-19
||
a901
|
D-20
D621 1-24 Q212 G-18 Q902 E-20
nee ea CH stereo seperation: @) - ® ee omer lee es
Carrier
f
ency:
98
MH
et
D624
J-22
Q216
F-17
921
F-20
HRI Aa ster ee Madison: : FM RF Monaural signal reli stereo separanon: ©) 0)
Output gels 3 mV (70 dBu) The separations of both channels should be equal. D625 J-23 0231 D-18 Q931 G-19
n distortion. : D626 J-22 0232 D-18
Procedure:
a
ee
1. Tune the set to 98 MHz.
n distortion. 2. Adjust RV241 so that 1 - 10 indication bars light up
on the signal meter.
-15-
~16-

ST-S770ES
5-1. PRINTED WIRING BOARDS
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specified.
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SECTION 6
EXPLODED VIEWS
NOTE: 6-1 CABINET ASSEMBLY
e@ _XX, _X mean standardized parts so
they may have some differences from
the original one.
e Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE). . . (RED)
Hi T
Parts color Cabinet's color
e@ Items marked “*” are not stocked since
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Ref.No. Part No.
1 A-4325-050-A
| A-4325-062-A
1 A-4325-064-A
2 4-908-848-01
2 4-908-848-21
3 X-4886-042-1
3 X-4941-920-1
X) 1-452-419-21
6 4-923-475-11
6 4-923-475-21
7 X-4886-044-1
q X-4941-922-2
8 X-4941-414-2
8 X-4941-921-2
9 4-923-482-01
9 4-923-482-11
10 4-9$08-097-21
10 4-908-097-51
in 4-908-046-01
ia 4-908-046-81
12 4-864-307-00
13 X-4886-045-1
13 X-4941-416-1
13 X-4941-923-1
14 4-923-474-01
14 4-923-474-11
18 4-935-802-11
15 * 4-935-802-21
16 X-4886-046-1
16 X-4941-417-1
16 X-4941-924-1
7 * 4-908-036-11
18 X-3304-944-1
18 X-3363-489-1
19 X-4885-041-1
19 X-4941-919-1
20 4-884-612-21
22 4-923-477-01
23 4-933-446-01
3-704-366-01
24 3-704-366-01
25 3-701-506-01
26 3-533-938-00
27 4-935-807-01
28 4-923-492-11
PT901 A\ 1-450-409-11
ST-S770ES
Description Remark
PANEL ASSY, FRONT+++ (GOLD) (AEP, 6)
PANEL ASSY, FRONT+++ (BLACK) (AEP, G, IT)
PANEL ASSY, FRONT (UK)
EMBLEM, SONY+++ (BLACK)
EMBLEM, SONY-++ (GOLD)
BUTTON (A) ASSY+++ (BLACK)
BUTTON (A) ASSY+++ (GOLD)
MAGNET
PLATE, ORNAMENTAL* ++ (BLACK)
PLATE, ORNAMENTAL: ++ (GOLD)
ESCUTCHEON ASSY, PANEL+++ (BLACK)
ESCUTCHEON ASSY, PANEL+++ (GOLD)
LID ASSY+++ (BLACK)
LID ASSY+++ (GOLD)
KNOB+++ (BLACK)
KNOB+++ (GOLD)
KNOB+++ (BLACK)
KNOB-++ (GOLD)
KNOB, SQUARE+++ (BLACK)
KNOB, SQUARE+++ (GOLD)
RING
PANEL (LEFT) ASSY, SIDE+++ (BLACK)
(AEP, 1T)
PANEL (L) ASSY, SIDE+++ (BLACK) (6)
PANEL (L) ASSY, SIDE+++ (GOLD)
RING, ORNAMENTAL+ ++ (BLACK)
RING, ORNAMENTAL: ++ (GOLD)
CASE+++ (BLACK)
CASE+++ (GOLD)
PANEL (RIGHT) ASSY, SIDE+++ (BLACK)
(AEP, IT)
PANEL (R) ASSY, SIDE+++ (BLACK) (6)
PANEL (R) ASSY, SIDE+-+ (GOLD)
PLATE, BOTTOM
FOOT ASSY+++ (BLACK)
FOOT ASSY+++ (GOLD)
BUTTON (3 GANG) ASSY-++ (BLACK)
BUTTON (3 GANG) ASSY-++ (GOLD)
INDICATOR, EJECT
PLATE, LIGHT INTERCEPTION
SCREW (SIDE PANEL) (AEP, G, 11)
SCREW (CASE) (M3X8) (UK)
SCREW(CASE)(M3x8)
SET SCREW, DOUBLE POINT 3X4
CLOTH
CLOTH, BLIND
DISPLAY, WINDOW
TRANSFORMER, POWER

ST-S770ES |
6-2. CHASSIS ASSEMBLY
cs
S
ts
Ly
Noe
63
(included « A)
not supplied
55
56
$7
98
98
12
13
14
15
16
a
18
18
$661
$951
CN671
FL701
Part No.
3-304-605-11
4-923-499-01
3-703-353-01
3-346-266-21 He HH HH
e 4-911-325-01
* 2-287-441-01
* 4-921-402-01
* 4-923-873-01
* 4-923-873-11
* 3-703-244-00
3-704-242-01
* 4-908-019-01
* 4-923-498-12
4-923-498-32
”
X-4886-023-1
4-908-042-11
4-923-479-01
A-4345-296-A
A-4345-297-A
A~4345-801-A
eH HH HH HH
1-633-127-11
1-633-128-11
1-633-129-11
1-633-130-11
1-633-131-11
eH HH
* 1-633-132-11
* 1-641-160-11
* 1-560-242-51
* 1-560-242-61
* 1-560-242-71
* 1-560-242-91
ZN 1-574-383-11
AN 1-514-384-11
1-571-333-11
AN 1-512-267-11
* 1-559-135-41
1-519-558-11
Description Remark
HOLDER (NO 1), LED
HOLDER (FL)
SUPPORT, PC BOARD
PLATE, GROUND
PLATE (A), SHIELD
PLATE, SHIELD
HEATE SINK
BRACKET, CORD STOPPER+++ (EXCEPT GOLD)
(6)
BRACKET, CORD STOPPER:+>+ (GOLD) (6)
BUSHING (2104), CORD
SCREW, TERMINAL, + BVTP CLAW
HOLDER (A), ANTENNA
PANEL, BACK+++ (BLACK)
PANEL, BACK+++ (GOLD)
PLATE ASSY, SLIT
CHASSIS, MAIN
SPACER
TUNER BOARD, COMPLETE (AEP, UK)
TUNER BOARD, COMPLETE (6)
TUNER BOARD, COMPLETE (IT)
DISPLAY BOARD
CONNECT (A) BOARD
CONNECT (8) BOARD
ENCODER BOARD
PGM SW BOARD
AC SW BOARD
AC CONNECTOR BOARD
BUS BAR 7P
BUS BAR 2P
BUS BAR 6P
BUS BAR 10P
CORD, POWER (AEP)
CORD, POWER (UK)
SWITCH, ROTARY
SWITCH, PUSH (AC POWER) (1 KEY)
CORD (WITH CONNECTOR)
INDICATOR TUBE, FLOURESCENT
The components identified by mark A\ or dotted
line with mark A\ are critical for safety.
Replace only with part number specified.
~30-