Sony SRS-T70 User manual

MICROFILM
SERVICE MANUAL
ACTIVE SPEAKER SYSTEM
US Model
Canadian Model
AEP Model
E Model
Tourist Model
SRS-T70
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SPECIFICATIONS
Ver 1.0 2000. 01

– 2 –
SECTION 1
GENERAL This section is extracted from
instruction manual.
• LOCATION OF CONTROLS

– 3 –
FRONT CASE
• This set can be disassembled in the order shown below.
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
Set Speaker unit (SP1) (L ch)
Speaker unit (SP2) (R ch
)
AMP board
Jack board
Front case
3six screws
(P2.6 ×10)
4screw
(P2 ×5)
1Open the stand
in the direction
of arrow A.
2battery case lid
5front case
A

– 4 –
SPEAKER UNIT (SP1) (L ch), SPEAKER UNIT (SP2) (R ch)
2two screws
(P2.6 ×6)
2two screws
(P2.6 ×6)
4Remove the
rotary shaft holder
in the direction of
arrow A.
4Remove the rotary shaft holder
in the direction of arrow B.
1Remove two solders of
speaker unit (SP2) (R ch) lead.
1Remove two solders of
speaker unit (SP1) (L ch) lead.
3
3
A
B
8four screws
(P2.6 ×6)
5four screws
(P2.6 ×10)
7acoustic absorbent
6rear cabinet (R)
6rear cabinet (L)
5four screws
(P2.6 ×10)
8four screws
(P2.6 ×6)
9speaker unit (SP2) (R ch)
0front cabinet (R) assy
7acoustic
absorbent
9speaker unit (SP1) (L ch)
0front cabinet (L) assy

SRS-T70
– 5 – – 6 –
SECTION 3
DIAGRAMS
3-1. BLOCK DIAGRAMAMP BOARD, JACK BOARD
PRECAUTION ON ROUTING THE LEAD WIRES
05
•SIGNAL PATH
: LINE INPUT
S1 (1/4)
S1 (2/4)
S1 (3/4)
S1 (4/4)
B+
SP1
(L-CH)
SP2
(R-CH)
P1
(LINE INPUT)
POWER AMP
IC1
OUT1
IN1+ POWER
AMP 1912
OUT2
IN2+ POWER
AMP
MUTING
Q1
MUTING
Q2
2
9
POWER AMP
IC2
OUT1
IN1+ POWER
AMP 19
12
OUT2IN2+ POWER
AMP 2
9
+ +
JK1
DC IN 9V
!
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
4PCS. 6V
D2
POWER
S1
POWER
OFF/DIRECT
ON
switch knob
S1
Note: When mounting the AMP board,
align the position of switch (S1)
and the switch knob.
3AMP board
2two screws
(P2 ×5)
1Remove four solders
of speaker unit
(SP1/SP2) leads.
1Remove three solders
of cord (with plug).
1Disconnect three soldered lead wire,
two (yellow, brown) from the JACK board
and one (red) from plus battery spring.
(For the colors of lead wires and
“PRECAUTION ON ROUTING THE LEAD WIRES”,
see the following figure.)
2two screws
(P2 ×5)
3JACK board
1Disconnect three solders lead wire,
two (yellow, brown) from the AMP board
and one (black) from minus battery spring.
(For the colors of lead wires and
“PRECAUTION ON ROUTING THE LEAD WIRES”,
see the following figure.)
AMP board
GRN
NATURAL
RED
WHT
NATURAL
RED
BLK
lead wire
(speaker unit (SP2)
(R ch) yAMP board)
lead wire
(speaker unit
(SP1) (L ch)
yAMP board)
lead wire (brown)
(AMP board yJACK board)
lead wire
(JACK board y
minus battery spring)
lead wire (red)
(AMP board yplus battery spring)
lead wire (yellow)
(AMP board yJACK board)
cord (with plug)
Note: Put a knot of the cord
(with plug) into a
groove of rear case.
rear case
JACK board
Note: The lead wires could be pinched between front case
and rear case, resulting in cut-off.

SRS-T70
– 7 – – 8 –
3-2. PRINTED WIRING BOARD
• Semiconductor
Location
Ref. No. Location
D1 A-1
D2 B-1
D3 B-2
IC1 B-5
IC2 B-3
Q1 A-3
Q2 A-2
Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•z:Through hole.
•b: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern facesideseenfrom
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.

SRS-T70
3-3. SCHEMATIC DIAGRAM
– 9 – – 10 –
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
•C: panel designation.
•U: B+ Line.
• Power voltage is dc 9 V and fed with regulated dc power
supply from external power voltage jack.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : POWER ON
• Voltagesare taken with aVOM(Inputimpedance10MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F: LINE INPUT
• IC Block Diagram
IC1, 2 TEA2025D-013TR
20 19 18 17 16 15 14 11
+
–
13 12
+
–
THERMAL
PROTECT
START
CIRCUIT
10987654321
DECOUPLING
VCC OUT 1 BOOT 1 GND GND GND GND FEEDBACK IN1 (+) GND (SUB
)
BRIDGE
OUT 2
BOOT 2
GND GND GND GND
FEEDBACK
IN2 (+)
SVR

– 11 – – 12 –
SECTION 4
EXPLODED VIEW
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Hardware (# mark) list and accessories and
packing materials are given in the last of the
electrical parts list.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑↑
Parts Color Cabinet's Color
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
1 4-223-349-01 CASE, FRONT
*2 A-4542-603-A AMP BOARD, COMPLETE
3 4-223-357-01 HOLDER, ROTARY SHAFT
4 3-042-545-01 SHEET, BLIND
6 X-4952-281-1 CABINET (L) ASSY, FRONT
7 3-042-547-01 ABSORBENT, ACOUSTIC
8 4-223-355-01 CABINET (L), REAR
9 4-223-348-01 KNOB, SWITCH
10 4-223-361-01 SPRING, BATTERY RELAY
11 4-223-350-01 CASE, REAR
12 4-223-359-01 SPRING, PLUS BATTERY
13 4-223-360-01 SPRING, MINUS BATTERY
14 4-223-358-01 STAND
15 3-042-546-01 CUSHION, BATTERY CASE LID
16 4-223-362-01 LID, BATTERY CASE
17 4-223-356-01 CABINET (R), REAR
18 X-4952-282-1 CABINET (R) ASSY, FRONT
19 4-224-447-01 SPRING, STAND
*20 1-675-005-11 JACK BOARD
21 1-559-891-81 CORD (WITH PLUG)
SP1 1-418-748-11 SPEAKER UNIT (L ch)
SP2 1-418-748-11 SPEAKER UNIT (R ch)
1
2
20
not supplied
#1
#1
#4
#2
#2
#2
#3
#1
#3
#3
#3
#2
not supplied
not supplied
not supplied
SP1
not supplied
not
supplied
21
18
SP2
A
B
B
14
12
13
A
11
15
16
7
10
9
7
8
3
4
4
3419
6
17
SECTION 5
ELECTRICAL PARTS LIST
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
AMP JACK
*A-4542-603-A AMP BOARD, COMPLETE
********************
< CAPACITOR >
C1 1-164-222-11 CERAMIC CHIP 0.22uF 25V
C2 1-164-222-11 CERAMIC CHIP 0.22uF 25V
C3 1-126-187-11 ELECT CHIP 0.1uF 20% 50V
C4 1-126-187-11 ELECT CHIP 0.1uF 20% 50V
C5 1-128-397-21 ELECT CHIP 100uF 20% 16V
C6 1-128-397-21 ELECT CHIP 100uF 20% 16V
C7 1-126-209-11 ELECT CHIP 100uF 20% 4V
C8 1-126-209-11 ELECT CHIP 100uF 20% 4V
C9 1-128-397-21 ELECT CHIP 100uF 20% 16V
C10 1-128-397-21 ELECT CHIP 100uF 20% 16V
C11 1-126-209-11 ELECT CHIP 100uF 20% 4V
C12 1-126-209-11 ELECT CHIP 100uF 20% 4V
C13 1-128-397-21 ELECT CHIP 100uF 20% 16V
C14 1-128-397-21 ELECT CHIP 100uF 20% 16V
C15 1-126-393-11 ELECT CHIP 33uF 20% 10V
C16 1-124-779-00 ELECT CHIP 10uF 20% 16V
C17 1-124-779-00 ELECT CHIP 10uF 20% 16V
C18 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C19 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C20 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C21 1-109-982-11 CERAMIC CHIP 1uF 10% 10V
C22 1-126-935-11 ELECT 470uF 20% 16V
C23 1-163-021-11 CERAMIC CHIP 0.01uF 10% 50V
C24 1-163-035-00 CERAMIC CHIP 0.047uF 50V
C25 1-163-035-00 CERAMIC CHIP 0.047uF 50V
C26 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C101 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C102 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C103 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
C104 1-163-009-11 CERAMIC CHIP 0.001uF 10% 50V
< DIODE >
D1 8-719-800-76 DIODE 1SS226
D2 8-719-812-43 LED TLG124A (POWER)
D3 8-719-105-57 DIODE RD3.9M-B1
< IC >
IC1 8-759-524-84 IC TEA2025D-013TR
IC2 8-759-524-84 IC TEA2025D-013TR
< TRANSISTOR >
Q1 8-729-230-49 TRANSISTOR 2SC2712-YG
Q2 8-729-230-49 TRANSISTOR 2SC2712-YG
< RESISTOR >
R1 1-216-065-00 RES, CHIP 4.7K 5% 1/10W
R2 1-216-065-00 RES, CHIP 4.7K 5% 1/10W
R3 1-216-035-00 METAL CHIP 270 5% 1/10W
R4 1-216-035-00 METAL CHIP 270 5% 1/10W
R5 1-216-049-11 RES, CHIP 1K 5% 1/10W
R6 1-216-049-11 RES, CHIP 1K 5% 1/10W
R7 1-216-053-00 METAL CHIP 1.5K 5% 1/10W
R8 1-216-053-00 METAL CHIP 1.5K 5% 1/10W
R9 1-216-033-00 METAL CHIP 220 5% 1/10W
R10 1-216-033-00 METAL CHIP 220 5% 1/10W
R11 1-216-073-00 METAL CHIP 10K 5% 1/10W
R12 1-216-073-00 METAL CHIP 10K 5% 1/10W
R13 1-216-073-00 METAL CHIP 10K 5% 1/10W
R14 1-216-049-11 RES, CHIP 1K 5% 1/10W
R15 1-216-049-11 RES, CHIP 1K 5% 1/10W
R16 1-216-049-11 RES, CHIP 1K 5% 1/10W
R17 1-216-298-00 METAL CHIP 2.2 5% 1/10W
R18 1-216-298-00 METAL CHIP 2.2 5% 1/10W
R19 1-216-053-00 METAL CHIP 1.5K 5% 1/10W
R20 1-216-053-00 METAL CHIP 1.5K 5% 1/10W
< SWITCH >
S1 1-554-295-00 SWITCH, SLIDE (POWER)
**************************************************************
*1-675-005-11 JACK BOARD
***********
< JACK >
JK1 1-569-966-11 JACK, DC (DC IN 9V)
**************************************************************
MISCELLAEOUS
*************
21 1-559-891-81 CORD (WITH PLUG)
SP1 1-418-748-11 SPEAKER UNIT (L ch)
SP2 1-418-748-11 SPEAKER UNIT (R ch)
************************************************************
NOTE:
• Due to standardization, replacements in the
parts list may be different from the parts speci-
fied in the diagrams or the components used
on the set.
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
• RESISTORS
All resistors are in ohms.
METAL: Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F: nonflammable
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when order-
ing these items.
• SEMICONDUCTORS
In each case, u: µ, for example:
uA. . : µA. . uPA. . : µPA. .
uPB. . : µPB. . uPC. . : µPC. .
uPD. . : µPD. .
• CAPACITORS
uF: µF
• COILS
uH: µH
When indicating parts by reference
number, please include the board.

– 13 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
**************
HARDWARE LIST
**************
#1 7-685-103-19 SCREW +P 2X5 TYPE2 NON-SLIT
#2 7-685-133-19 SCREW +P 2.6X6 TYPE2 SLIT
#3 7-685-135-19 SCREW +P 2.6X10 TYPE2 SLIT
#4 7-621-255-40 SCREW +P 2X6
************************************************************
ACCESSORIES & PACKING MATERIALS
*********************************
3-042-998-11 MANUAL, INSTRUCTION (ENGLISH, SPANISH)
(US)
3-042-998-21 MANUAL, INSTRUCTION
(ENGLISH, FRENCH, GERMAN, ITALIAN,
SPANISH, DUTCH, SWEDISH, PORTUGUESE)
(Canadian, AEP, E, Tourist)
3-045-440-01 POUCH, CARRYING

– 14 –
SRS-T70
Sony Corporation
Personal Audio Division Company
9-927-198-11 2000A0574-1
Printed in Japan C2000. 1
Published by General Engineering Dept.