Sony STR-AVS7OX User manual

STR-AVS7OX/AVI070X
SERVICE MANUAL
US Model
Canadian Model
STR-AV970X/AV1070X
E Model
STR-AV1070X
Photo
:
AV970X
Photo
:
AV1070X
SPECIFICATIONS
Audio Power Specifications Less than 70nV
Damping factor 50
With 8-ohm load, both channels driven, from 20 - 20,000
Hz, rated 120 watts (STR-AV1070X) or 100 watts (STR-
AV970X) per channel minimum RMS power, with no
more than 0.015% (STR-AV1070X) or 0.03% (STR-
AV970X) total harmonic distortion from 250 milliwatts to
rated output.
Other Specifications
Amplifier section
Bohms, at1 | 195 + 195 140 + 140
kHz IHF walts watls
4 ohms, at 1
kHz JHF
Harmonic distortion al rated Less than
output 0.015%
Intermodulation (IM) distortion at | Less than Less than
rated output - 0.015% 0.03%
Power output of center amplifier |30 watts
(STR-AV1070X only) (15 + 15 watts, 8 ohms al 1kHz)
Power output of surround(REAR)/} 15 + 15 watts
DRLC amplifier (8 ohms, at 1kHz)
Frequency PHONO RIAA equalization curve 0.5
response dB
CD, DAT, 10 Hz — 70 kHz /)dB
TAPE 1,2
VIDEO 1,2,3"
Dynamic power
output
250 + 250
watts
190 + 190
watts
Less than
0.03%
Input sensitivity/
impedance
DAT,CD,
VIDEO 1,2,3°
TAPE 1,2
150 mV
50 kilohms
105 dB
85 dB** (A,150mV)
SPEAKERS {Accepts seakers of 8-16 ohms
HEADPHONES] Accepts headphones of high
and low impedance
CENTER OUT,}2.5 V, tkilohm
REAR OUT
PRE OUT 1V, 1Kilohm
MUTING -20dB
OBFB +10 dB (70 Hz)
Graphic Equalizer 7-band +10 dB al 63Hz, 160
Hz, 400Hz,1kHz, 2.5 kHz, 6.3
kHz and 16 kHz
*STR-AV1070X only
*78IHF
~— Continued on page 2 —
FM STEREO /FM-AM RECEIVER
ONY.
MICROFILM
aL

STR-AV970X/AV1070X |
FM tuner section ;
Frequency range 87.5 — 108.0 MHz
Antenna terminals 300 ohms, balanced
75 ohms, unbalanced
Sensitivity at 50 dB 18.3 dBf, 4.5 pV (mono)
38.3 dBf, 45 pV (stereo)
Usable sensitivity 11.2 dBf, 2 wV (IHF)
carat ae
distortion at
IM distortion ae
nie = Cr
ra
Spurious response ratio 80 dB
FF intermodulation at 800 60 dB
kHz
Auto tuning 30 dBf
threshold
High 50 dBf
o 2 8
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 PUB-
LISHED BY SONY.
AM tuner section
Frequency range 530 — 1710 kHz (with 10 kHz interval)
531 — 1710 kHz (with 9 kHz interval)
a
Usable sensitivity 50 dB/m (at 1,000 kHz or 999 kHz)
Harmonic distortion 0.5% (50 mV/m, 400 Hz)
Antenna
Selectivity 35 dB (9 kHz), 40 dB (10 kHz)
Auto tuning threshold {55 dB/m
Video section
pete, oo Al STR-AV1070X STR-AV970X
VIDEO 1,2,3: VIDEO 1,2:
1 Vp-p 75 ohms 1 Vp-p 75 ohms
VIDEO 1, MONITOR: 1 Vp-p 75 ohms
General
Rants eal STR-AV1070X STR-AV970X
System} Tuner section PLL quartz-locked digital synthesizer
system
Preamplifier Low-noise NF type equalizer
section
Power amplifier | Pure-complimentary SEPP
section .
Power consumption USA model: USA model:
265 watts 220 watts
Canada model: Canada model:
565 VA 450 VA
AC outlets Two switched, total 120 watts
430 x 147.5 x 350 mm
(17 x § 13/16 x 14 1/8 inches)
Weight 12.5 kg 10 kg
(27 Ib 9 oz) (22 Ib 1 02)
Supplied accessories FM wire antenna (1)
AM foop antenna (1)
Remote commander (1)
RM-P311 (STR-AV1070X)
RM-U211 (STR-AV970X)
Sony Batteries SUM-3(NS) (2)
Design and specifications subject to change without notice.
ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!
LES COMPOSANTS IDENTIFIES PAR UNE MARQLE lAN
SUR LES DIAGRAMMES SCHEMATIQUES ET LA liSTE
DES PIECES SONT CRITIQUES POUR LA SECLRITE
DE FONCTIONNEMENT. NE REMPLACER CES Com.
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS CE MANUE| OU
DANS LES SUPPLEMENTS PUBLIES PAR SONY.

’
SAFETY CHECK-OUT (US Model)
After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:
Check the antenna terminals, metal trim, ‘‘metallized”
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers’ instructions to use these instru-
ments.
2. A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The ‘‘limit’” indication is 0.75V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated - digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
ae SS (0.75 V)
= Earth Ground
Using an AC voltmeter to check AC leakage.
| STR-AV970X/AV1070X
TABLE OF CONTENTS
Section
itle
Page
1.
GENERAL
L-l,
COonnections--1s+srsssterteteeeeetenreeereeesees
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neertsstesesences
4
1-2.
Parts
Identification
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5
2.
ELECTRICAL
ADJUSTMENTS
------v-erseeerrcetsteererereee
7
3.
DIAGRAMS
31.
Circuit
Boards
Locations:rrcsrsrrerrersterseesesseeeserseres
10
3-2.
Printed
Wiring
Boards
—Main
Section—-srrrs+:
12
33.
Schematic
Diagrams
—Main
Section
creer
17
Schematic
Diagrams
—Sorround
Section
—-+++"+"*:
23
Schematic
Diagrams
—
Display
Section—
srr
27
4. EXPLODED VIEWS
4-1, Front Panel Section
4-2,
Chassis
Sectionssrssssssreereersestersessensensensneeesenenans
5.
ELECTRICAL
PARTS
LIST
--rrceseercerseeseeeerseetrteeteres
36

1-1. CONNECTIONS
Notes on Connections
@ Donotconnect the power cord to an AC outiet nor
press the POWER switch before accomplishing all other
connections
The cable connectors should be futly inserted into the
yacks Loose connection may cause hum and no:se
@ Jacks and plugs of (he connecting cord are color-
coded as follows:
Red jacks and plugs: For the right channel of audio
signals
White jacks and plugs For the left channel of audio
signals
Yellow jacks and plugs: For video signals
Connecting Audio Equipment
for center speakers
@ FM antenna fe
: S| ik ©
|
! =
Monitor TV or an amplitier
i
oo ©) ©)
© ©
@ AM antenna
@ Front speaker system
{A speakers)
Center speaker © Rear speaker
system system
(STR-AV1070X
only)
©
(©) ©
© ©
‘alld
DALC wireless remote
control receiver
(See page 32.)
a
{at re ©Front speaker
ms
is
system
|
(B
speakers)
OUT
Equalizer
etc.
8 8
ST.
@ODALC speaker
system
(See page 32.)
Tape deck 2
White
-» O} Lt
7©R
Red Red
Connecting Video Equipment
Monitor TV 1
VIDEO IN
Monitor TV 2 (ORLC)
VIDEO IN
STR-AV1070X only
WduaANdS
L NOILOAS
‘Jenuew uoNoNsysui
XOLOLAV /XOL6AV-HLS
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1-2. PARTS IDENTIFICATION
Front Panel
Ampliitier and general section
EDIT AUDIO button
Sound fietd control section
CURSOR MODE indicators
CURSOR MODE buiton
MUTING switch and indicator
Remote contro! sensor (STR-AV970X)
EDIT VIDEO/AUDIO buttons
(STR-AV1070X)
POWER switch
VOLUME
DALC/
contro!
POWEA
switch
HEADPHONES jack CURSOR mode
operation buttons BALANCE control
SPEAKERS Function selectors and TAPE 2 MONITOR
selector button and indicator
VIDEO 3/INPUT jack
(STR-AV1070X only)
Tuner section
cr
DISPLAY FREQ/INDEX button
PRESET TUNING +/- buttons TUNING LEVEL button | PRESET SF LINK PGM button
TUNING DIRECT button PRESET SF LINK
INDEX SELECT/TUNING ON/OFF button
+/~ buttons
eS SO SS HES NS ON ° CURSOR
= Cit E+ MODE
OO) | me
FM/AM button
SHIFT button CURSOR mode operation buttons
FM MODE buton
MEMORY button
| ener
CURSOR MODE button
SOUND FIELD RECALL button
SOUND FIELD +/- buttons
DBFB (Dynamic Bass
Numeric buttons Feed Back) button
DOLBY PRO LOGIC selector
SURROUND MODE selector
URROUND ON/OFF button
EQUALIZER GRAPHIC button
EQUALIZER FLAT button
EQUALIZER ON/OFF button
CURSOR mode
operation buttons
ti
XOLOLAV/XOLEGAV-YHLS

Remote Commander
RAM-U211
(supplied with the STR-AV970X)
RM-P311
(supplied with the STR-AV1070X)
(Program control section (RM-P311 onty)
Mode selector and indicator (page 34)
SONY STD: To contro! Sony equipment
USER STD: To control equipment whose remote
contro! functions are stored.
LEARN: To store functions of other remote
commanders emitting infrared rays
PROGRAM CLEAR button: Clears the stored
functions.
(J MODE selector
1: To select the functions indicated in ight gray such
as DECK, DAT, CD player and CURSOR/
SURROUND mode of the receiver
2: To select the functions indicated in blue such as
VTR, LOP (Laser disc player) and TV.
G Cursor control section
CURSOR operation butions
MODE bulton. Selects cursor mode
(4) Sound control section
SURROUND buttons
ON/OFF: Turns on/off the surround mode
MODE: Selects the surround mode
T. (test) TONE. Generates a pink noise signal that is
sent in succession to each speaker
EQ (equalizer) ON/OFF button: Turns on/olt the
equalizer,
S.(sound) FIELD buttons
MODE: Selects sound field mode
USER/PRESET button (AM-P311 onty): This button
does not operate
OBFB button (RM-U211 only): Turns on/off the OBFB
(Dynamic Bass Feed Back)
ODS/OBFE bution (RM-P311 only): Turns on/off the
DBFB (Dynamic Bass Feed Back). (DDS function is
Not available with this receiver.)
) Amplifier section
FUNCTION selectors: Select an input source of the
receiver. (The VIDEO 3 button does not operate on
the STR-AV970x )
DIGITAL button (RM-P311 only): This button does not
operate.
REAR LEVEL +/- buttons: Control the volume of rear
speakers (surround level)
MUTING button: Mutes the sound.
MASTER VOL +/- buttons: Control the receiver
volume
CENTER LEVEL +/~ buttons : Control the volume of
center speaker (Surround level)
ON SCREEN buttons (RM-P311 only)
ON/OFF button: This button does not operate
TITLER ON/OFF buiton: This button does not
operate.
[6] Control for other equipment
Power control block
SYSTEM OFF button: Turns oft the power of the
whole system: LDP, VTR, TV and AUDIO
LOPATR/TV/AUDIO POWER butions: Control tne
power of each unit
CDP/LDP control block
D (disc) SKIP. Disc skip (for a CD player equipped
with a mulli-disc changer)
>» Staris play
‘mi. Locates a deswed selection (tor aCD
player only with RM-U211)
@. Stops play.
<<>>: Manual search (for a laser disc player only
with RM-U211)
ir Pause
TAPE/OAT/VTR control block
ANT TV/VTR button. Selects the output signal trom
the antenna terminal on the VCR, ether a TV signal
or VCR programs
VTA CH +/- bullons: Select channel on the VCR
<</>—. fast winding
m@. Stop
</> Play
i. Pause
@ Recording (AM-U211: While pressing @, press &)
REC MODE REV/FWD buttons (RM-P311 only):
For reverse recording, press REV and @ together.
For forward recording, press FWD and @ together
DECK/VTR selector (AM-U211 only)
MODE 1(DECK A,B and DAT): Selects DECK A, B
or DAT
MODE 2{VTR 1, 2 and 3). Selects VTR 1, 2013
VTR 1, Betamax VCRs
VTR 2. 8mm VCRs
VTA 3 VHS VCRs
TV control block
TVNIDEO selector. Selects the program to see. TV
or VIDEO
VOL +/- buttons: Control the TV volume
CH +/- buttons. Select a preset channel
Program number (1 to 0) and ENTER buttons: Select
the channel!
SLEEP button
Set to the SLEEP timer mode. In this mode, the unit is
automatically turned off after 60 minutes
{8} Tuner section
INDEX SELECT and INDEX butions. Select an
indexed preset station
TUNER SHIFT and PRESET +/- butions. Selecta
preset station
(3} RESET button (RM-P311 only)
Reset the commander to the initial state
Note on the @ (recording) button under @) TAPE/DAT/VTR
buttons
If your recorder 1s of such type as pressing @ puts it in recording
Pause
mode.
first
press
@
on
this
commander
and
then
tt
Note:
The
<4
(play)
buttons
in
[§]
ang
the
SHIFT
button
and
PRESET
+/
~ buttons in i} can function without oressing one of ine FUNCTION
buttons in (8). # the CD player ts connected to ine CD jacks, the
tape deck to the TAPE jacks and the video deck to the VIDEO 1
Jacks (switcn the DECK/VTR Selector on ihe remote commander to
VTR 1)
13
XOLOLAV /“XOL6AV-ULS

SECTION 2
ELECTRICAL ADJUSTMENTS
2-1, ELECTRICAL ADJUSTMENTS
FM SECTION
¢ FM Discriminator (NULL) Adjustment
Setting :
FM RF stereo signal
generator
Carrier frequency : 98MHz
Output level : 25dB uz
Modulation : 1kHz
FM ANTENNA 3002
75kHz
dev.
terminal
(10096)
VOM
ap
(DC
range)
NULL terminal
Procedure :
1, Tune the set to 98MHz,
2. Adjust T21 for OV reading on the VOM.
Note: FM Tuning level adjustment should be made after FM
discriminator adjustment,
e FM Tuning Level Adjustment
Setting :
FM RF stereo signal
generator
Carrier frequency : 98MHz
Output level : 60dB us
Modulation : IkHz
75kHz dev.
(10096)
FM ANTENNA 300Q
terminal
Procedure :
1. Tune the set to 98MHz,
2. Adjust RV24 so that the STEREO LED goes on.
Note on Ceramic Filter (CF1, 2) Replacement.
This set employs two ceramic filters (CF1, 2) which should
have the same color marking to identify their center
frequency. Therefore FM IF offset adjustment by (*A, *B)
connection is necessary to match the center frequency of the
ceramic filters used with FM intermediate frequency.
color marking
la
(CFI, 2)
«FM Stereo Separation Adjustment
Setting :
FM RF stereo signal
generator
VTVM
FM ANTENNA 300 Q REC OUT
terminal
Carrier frequency : 98MHz
Output level: 60dB u
Modulation :
Audio (1kHz) : 33.75kHz dev. (4596)
Pilot (19kHz) : 7.5kHz dev. (109)
Sub-channel (38kHz) : 33.75kHz dev. (4596)
Procedure :
Tune the set to 98MHz,
FM stereo
signal generator
output channel
VTVM
connection
VTVM
reading (dB)
Adjust RV21 for
minimum reading.
Adjust RV21 for
minimum reading.
L-CH Stereo separation : @ —-®
R-CH Stereo separation: © -@®
The separations of both channels should be equal.
O: short
x : open
FM intermediate
frequency
Color | Center frequency | *A *B
mark (MHz) (D134) | (D135)
x
O
O
Ceramic filter
(MHz)
oO
Oo
x
2.
o
¢« Auto Stop Level Adjustment
Setting :
FM RF stereo signal
generator
FM ANTENNA 3002
terminal
Carrier frequency : 98MHz
Output level : 40dB uw or 454B
Procedure :
REC OUT
1,
Turn
the
High/Low
select
switch
to
High.
2,
Adjust
RV25
so
that
the
TUNED
LED
goes
on,
AM SECTION
e AM Tuning Level
Setting :
AM RF
signal generator
Put the lead-wire
Ww antenna close to
the set.
(Em
3096 amplitude
modulation by
400Hz signal
Procedure :
1, Tune the set to 1,050kHz,
AM LOOP ANTENNA
ob
"|
AM antenna
terminal
Adjust
the
RV22
so
that
the
TUNED
LED
goes
on,
Adjustment Location : Tuner board
(SURROUND BOARD)
RV25
[AUTO STOP LEVEL ADI | STOP LEVEL ADJ
S RV22
r]
TPI Ter RV21
RV24
Ry 721
FM TUNING
LEVEL ADJ

AMP SECTION
DC Bias Adjustment
e Perform this adjustment after replacement of power amp
or drive circuit transistors.
Setting :
VOLUME: 0
SPEAKERS: OFF (no load)
Procedures :
Connect the digital voltmeter to Bias Check Point (TP701:
L: L-CH, TP751:R: RCH).
Increase the AC power voltage gradually to 120V
confirming that the voltmeter will not indicate an
abnormal value,
(MAIN BOARD]
Confirm that the display is normal.
Adjust RT701 (L-CH) or RT751 (R-CH) so that the reading
on the voltmeter becomes 2mV within 30 seconds after
the power turned on,
Note: It is normal that the voltage will increase as time
passes.
5. Turn the power off and remove the digital voltmeter.
& RT7S1
SECTION 3
DIAGRAMS
31, CIRCUIT BOARDS LOCATION
TRANSFORMER-3 BOARD
(1070X : E MODEL)
POWER BOARD
TRANSFORMER-1 BOARD (970X)
TRANSFORMER-2 BOARD (1070X)
HEADPHONE BOARD
DISPLAY BOARD
MUTE BOARD
VOLUME BOARD
¢ FM FRONT-END SCHEMATIC DIAGRAM
SPEAKER OUT BOARD
VOLTAGE SELECTOR BOARD
(1070X : E MODEL)
REAR BOARD
SURROUND SPEAKER
BOARD
VIDEO BOARD
SURROUND BOARD
MAIN BOARD
EQUALIZER BOARD
RELAY BOARD
BALANCE VR BOARD
TRO
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—MAIN
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and tantalums.
+ All resistors are in Q and “%W or less unless otherwise
specified. (SURROUND, EQUALIZER BOARD }¢ W)
* Components for right channel have same values as for left
channel. Reference numbers are coded from
- {ERG}; nontlammable resistor.
mmm B+ Line
mmm - B- Line
. C_] : adjustment for repair.
+ AC voltage readings in the bias oscillator with a VTVM.
+ Voltages are taken with a VOM (Input impedance 10M Q).
Voltage variations may be noted due to normal produc-
tion tolerances.
+ Signal path.
o> =: FM
Note: Note:
The components identi- | Les composants identifiés par
fied by mark ordot- | une marque sont critiques
ted line with mark pour fa sécurité.
are critical for safety. Ne les remplacer que par une
Replace only with part | piéce portant le numéro spéci-
number specified. fié.
| STR-AV970X /AV1070X