Sony STSV-7 Service manual

ST-SV7

SERVICE MANUAL

Ver 1.0 2001.06

ST-SV7 is the tuner section
in MHC-SV7AV.

SPECIFICATIONS

Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohm unbalanced
Intermediate frequency 10.7 MHz

E Model

AM tuner section

Tuning range
Middle Eastern model:

Other models:

Antenna AM loop antenna
Antenna terminals External antenna terminal
Intermediate frequency 450 kHz
Dimensions (w/h/d)

Mass

Design and specifications are subject to change
without notice.

531 – 1,602 kHz
(with the interval set at 9 kHz)
531 – 1,602 kHz
(with the interval set at 9 kHz)
530 – 1,710 kHz
(with the interval set at 10 kHz)

Approx. 280 x 108 x 340 mm
Approx. 2.1 kg

FM STEREO, FM/AM

9-873-152-01 Sony Corporation

2001F0500-1 Home Audio Company
C 2001.6 Shinagawa Tec Service Manual Production Group

SUPERHETERODYNE TUNER

ST-SV7

SECTION 1

SERVICING NOTES

TABLE OF CONTENTS

1. SERVICING NOTES ................................................ 2

2. GENERAL

Location of Controls ....................................................... 3

Setting the Time .............................................................. 4

3. DISASSEMBLY

3-1. Disassembly Flow ........................................................... 5

3-2. Cover ............................................................................... 6

3-3. Front Panel Section ......................................................... 6

3-4. PANEL Board, SIRCS Board ......................................... 7

3-5. Tuner pack (FM/AM)...................................................... 7

3-6. MAIN Board ................................................................... 8

3-7. DSP Board....................................................................... 8

4. TEST MODE.............................................................. 9

5. DIAGRAMS

5-1. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 10

5-2. Schematic Diagram – MAIN Board (1/2) – .................. 12

5-3. Schematic Diagram – MAIN Board (2/2) – .................. 13

5-4. Printed Wiring Board – MAIN Board – ........................ 14

5-5. Printed Wiring Board – DSP Board –............................ 15

5-6. Schematic Diagram – DSP Board (1/2) – ..................... 16

5-7. Schematic Diagram – DSP Board (2/2) – ..................... 17

5-8. Printed Wiring Boards – PANEL Section – .................. 18

5-9. Schematic Diagram – PANEL Section –....................... 19

5-10. IC Pin Function Description ........................................... 20

6. EXPLODED VIEWS

6-1. Cover, Front Panel Section ............................................. 26

6-2. Chassis Section ............................................................... 27

This set is a component of the MHC-SV7AV.
The MHC-SV7AV system configuration is as shown below, and
therefore it does not operate normally unless all four components
are connected.
In performing the repair, connect all components with the system
cables.
Note: The precaution to the users is described on the label stuck
on the back panel (video CD player) and in the troubleshooting
section in the Operation Manual.

System Configuration:

AC IN

TA

POWER SUPPLY

ST

MASTER & GRAPHIC µcon

DISPLAY

MCE

HTC & VMP µcon

7. ELECTRICAL PARTS LIST ............................... 28

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.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 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.

TC

TC µcon

2

LOCATION OF CONTROLS

– Front Panel –

SECTION 2

GENERAL

ST-SV7

This section is extracted from
instruction manual.

– Rear Panel –

2

3

qk qlw; wa ws

—

+

+

—

wdwfwgwhwj

1

4 5 6 7

8

09qa

CLOCK/TIMER wh (13, 25, 34)
DISPLAY qk (13, 18, 33, 40)
ENTER ws (22)
IR receptor wj
PRESET –/+ wd (22)
STEREO/MONO ql (22)
TIMER SELECT wg (26, 35)
TUNER/BAND wf (22)
TUNER MEMORY w; (22)
TUNING –/+ wa (22)

1 ANTENNA terminal
2 SYSTEM CONTROL 1 connector (TO TA-SV7AV)
3 SYSTEM CONTROL 2 connector (TO TA-SV7AV)
4 SYSTEM CONTROL 3 connector

(FROM MCE-SV7)

5 OPTICAL IN terminal
6 OPTICAL IN terminal (FROM MCE-SV7)
7 SYSTEM CONTROL 4 connector (TO TC-S3)
8 OPTICAL OUT terminal
9 SUB WOOFER OUT jack
0 MD IN/OUT jack
qa VIDEO (AUDIO) IN jack

3

ST-SV7

Remote Control

CHECK qd (17)
CLEAR qs (17, 19)
CLOCK/TIMER SELECT 3

(26, 35)

CLOCK/TIMER SET 2 (13, 25,

34)

DBFB ej (27)
DIGITAL r; (36, 40)
DISPLAY rd (13, 18, 33, 40)
D.SKIP 9 (14, 16, 20, 21)
ENTER wf (11, 13, 15, 17, 21,

22, 25, 26, 30–33, 35)

EQ wh (31)
EQ ON/OFF wa (32)
FILE SELECT +/– wd (27, 28,

32)

FUNCTION el (10, 14–17, 24,

25, 34, 36)

GROOVE ek (27)
KARAOKE PON qk (33)
KEY CONTROL
MD rs (36)
Numeric buttons 8 (15, 16, 19,

20, 21)

ON SCREEN wk (18)

/ ql (33)

1234 5

rg

rf

rd

rs

ra

r;

el
ek
ej

eh
ef

es
e;

wk

eg
ed

ea
wl

wj

O

wh

V

wg

Bb

v

PICTURE EFFECT wl (21)
PRESET –/+, PREV/NEXT ea

(14, 15, 20, 22)

REPEAT q; (15, 16)
RETURN O eg (15)
PLAY MODE qa (14, 16, 17, 25)
SELECT CD N es (14–17, 19,

21)

SET UP w; (11, 13, 30, 32, 33)
SLEEP 1 (34)
SPECIAL MENU e; (19, 20, 21)
SPECTRUM ANALYZER rf

(33)

SUR wj (30)
TAPE A nN ef (23)
TAPE B nN qf (23, 24)
TUNER/BAND ed (22)
TUNING –/+ qh (22)
TV CH +/– 7 (10)
TV VOL +/– 6 (10)
TV @/1 4 (10)
TV/VIDEO rg (10)
VIDEO ra (36)
VOL +/– ws

Setting the time

1

Turn on the system.

2

Press CLOCK/TIMER (or CLOCK/TIMER
SET on the remote).

When you set the time for the first time,

6
7

8
9
q;
qa

qs

qd
qf

x

nNnN

Mm>.

X

qh
qk

qg
qj

ql
w;

wa

ws

wd
wf

BUTTON DESCRIPTIONS

@/1 (power) 5
X (pause) qj
x (stop) qg
./> (go back/go forward)

ea

m/M (rewind/fast forward)

qh

O/o/P/p wg
>10 eh

proceed to step 5.

3

Press O or o repeatedly to select
“CLOCK SET”.

4

Press ENTER (A/V amplifier or remote).

5

Press O or o repeatedly to set the hour.

6

Press ENTER (A/V amplifier or remote).

7

Press O or o repeatedly to set the
minutes.

8

Press ENTER (A/V amplifier or remote).

Tip

If you have made a mistake or want to change the
time, start over from step 2.

Note

The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.

4

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SET

3-2. COVER

(Page 6)

ST-SV7

SECTION 3

DISASSEMBLY

3-3. FRONT PANEL SECTION

(Page 6)

3-4. PANEL BOARD,

SIRCS BOARD
(Page 7)

3-5. TUNER PACK (FM/AM)

(Page 7)

3-6. MAIN BOARD

(Page 8)

3-7. DSP BOARD

(Page 8)

5

ST-SV7

)

Note: Follow the disassembly procedure in the numerical order given.

3-2. COVER

3

cover

2

two screws
(case 3 TP2)

1

screw
(+BVTT3

×

6 (S))

3-3. FRONT PANEL SECTION

3

two claws

4

front panel section

2

1

wire (flat type) (19 core)
(CN502)

two screws
(case 3 TP2

3

two claws

3

claw

2

three screws
(BVTP3

×

8)

6

3-4. PANEL BOARD, SIRCS BOARD

)

6

SIRCS board

5

two claws

2

two screws
(BVTP2.6

×

8)

4

PANEL board

2

four screws
(BVTP2.6

1

wire (flat type) (19 core
(CN602)

×

8)

ST-SV7

3-5. TUNER PACK (FM/AM)

1

wire (flat type) (11 core)
(CN506)

3

two claws

3

tuner pack (FM/AM)

2

two screws
(BVTP3 × 8)

7

ST-SV7

r

3-6. MAIN BOARD

4

1

wire (flat type) (19 core)
(CN502)

screw
(BVTP3

1

wire (flat type) (21 core)
(CN509)

6

MAIN board

×

8)

1

wire (flat type) (23 core)
(CN508)

2

five connectors



(CN510, 5031, 5032, 5041, 5042)

4

two screws
(BVTP3 × 8)

3

three screws
(BVTP3 × 8)

5

PC board holder

3-7. DSP BOARD

1

1

wire (flat type) (23 core)
(CN603)

6

DSP board

wire (flat type) (21 core)
(CN602)

2

connector
(CN601)

4

three screws
(BVTP3 × 8)

3

three screws
(BVTP3

×

8)

5

PC board holde

2

connector
(CN601)

8

SECTION 4

TEST MODE

ST-SV7

Note: Use following buttons in the test mode.

no mark: Button of tuner unit (ST-SV7)

1

*

: Button of amplifier unit (TA-SV7AV)

2

*

: Button of CD unit (MCE-SV7)

[MC Cold Reset]

• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.

Procedure 1:

1. Press the ?/1 *1 button to turn the power ON.

2. While pressing the [DIGITAL]*1 button, press the

[DISPLAY] button.

3. The set is reset, and becomes standby state.

Procedure 2:

1. Press the ?/1 *1 button to turn the power ON.

2. While pressing the both [PLAY MODE]*2 and x *2 buttons,

press the M *2 button.

3. The set is reset, and becomes standby state.

[MC Hot Reset]

• This mode resets the set with the preset data kept stored in the
memory. The hot reset mode functions same as if the power
cord is plugged in and out.

Procedure 1:

1. Press the ?/1 *1 button to turn the power ON.

2. While pressing the both [STEREO/MONO] and [CINEMA

STUDIO C]*

3. The set is reset, and becomes standby state.

Procedure 2:

1. Press the ?/1 *1 button to turn the power ON.

2. While pressing the both [PLAY MODE]*2 and x *2 buttons,

press the m *2 button.

3. The set is reset, and becomes standby state.

[Change-over the AM Tuning Interval]
(EXCEPT Sauidi Arabia model)

• The AM tuning interval can be changed over 9 kHz or 10 kHz.

Procedure:

1. Press the ?/1 *1 button to turn the power ON.

2. Turn the [FUNCTION] *

the [TUNER/BAND] button to select the BAND “AM”.

3. Press the ?/1 *1 button to turn the power OFF.

4. While pressing the [ENTER] button, press the ?/1 *1 button,

and the display on the fluorescent indicator tube changes to
“AM 9 K STEP” or “AM 10 K STEP”, and thus the tuning
interval is changed over.

1

buttons, press the [TIMER SELECT] button.

1

knob to select “TUNER”, and press

[GC Test Mode]
Enter the GC Test Mode mode

Procedure 1:

1. Press the ?/1 *1 button to turn the power ON.

2. While pressing the both [STEREO/MONO] and [CINEMA

STUDIO C]*

1

buttons, press the [CLOCK/TIMER] button.

3. LEDs and fluorescent indicator tube are all turned on of all
units.

Procedure 2:

1. Press the ?/1 *1 button to turn the power ON.

2. While pressing the both [PLAY MODE]*2 and x *2 buttons,
press the Z (DISC 1)*2 button.

3. LEDs and fluorescent indicator tube are all turned on of all
units.

Version Display Mode

Procedure:

1. Enter the GC test mode.

2. Each time the [TUNER MEMORY] or [DISC 1]*2 button is
pressed, microcomputer or mechanism deck version is
displayed of each unit.

3. Press the [TUNING +] or [DISC 3]*2 button to detail is displayed
the version.

Key Check Mode

Procedure:

1. Enter the GC test mode.

2. Press the [TUNING -- ] or [DISC 2]*2 button to set the key check
mode.

3. In the key check the mode, the fluorescent indicator tube
displays “K 0 J 0 V 0” . Each time a button is pressed, “K”
value increases. However, once a button is pressed, it is no
longer taken into account.

VACS Level Display Mode

Procedure:

1. Enter the GC test mode.

2. Press the

[TUNING +] or [DISC 3]*

2

button to display VACS

level on the fluorescent indicator tube.

Segment Check Mode

Procedure:

1. Enter the GC test mode.

2. Press the [ENTER] or x *2 button to set the segment check
mode.

3. In the segment check the mode. Each [ENTER] or x *
button is pressed, the fluorescent indicator tube displays is
switching variously.

2

[Change-over of VACS ON/OFF]

1. Press the ?/1 *1 button to turn the power ON.

2. While pressing the both [STEREO/MONO] and [CINEMA

STUDIO C]*

1

buttons, press the [CINEMA STUDIO B] button,

and VACS ON/OFF is change over.

Releasing the GC Test Mode

• To release from this mode, press three b uttons in the same manner

as entering this mode or disconnect the power cord.

9

ST-SV7

SECTION 5

DIAGRAMS

5-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

Note on Printed Wiring Board:

• X : parts extracted from the component side.

• Y : parts extracted from the conductor side.

• : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)

Caution:
Pattern face side: Parts on the pattern face side seen from
(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.

• Indication of transistor.

C
Q

B

B

B

E

Q

CE

These are omitted.

These are omitted.

Q

CE

These are omitted.

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 Ω and 1/
specified.

f

•

• 5 : fusible resistor.

• C : panel designation.

Note: The components identified by mark 0 or dotted line

• A : B+ Line.

• B : B– Line.

• Voltages and waveforms are dc with respect to ground

• V oltages are taken with a VOM (Input impedance 10 MΩ).

• Waveforms are taken with a oscilloscope.

• Signal path.

• Abbreviation

: internal component.

with mark 0 are critical for safety.
Replace only with part number specified.

under no-signal (detuned) conditions.
no mark : TUNER (FM/AM)
( ) : CD PLAY
〈〈 〉〉 : AC OFF

Voltage variations may be noted due to normal produc­tion tolerances.

Voltage variations may be noted due to normal produc­tion tolerances.

F : TUNER (FM/AM)
E : T APE PLA Y
G : RECORD
J : CD PLAY
c : DIGITAL INPUT
N : MIC INPUT

EA : Saudi Arabia model
SP : Singapore model
TH : Thailand model

: Impossible to measure

∗

4

W or less unless otherwise

• Circuit Boards Location

SIRCS board

DSP board

TUNER PACK

MAIN board

PANEL board

10

ST-SV7

• Waveforms
– MAIN Board –

1 IC501 qa (XCOUT)

30.5 µs

2 IC501 qd (XOUT)

2.6 Vp-p

2.7 Vp-p

– DSP Board –

1 IC601 9 (MCLK1), IC604 w; (XMCK),

wa (XOUT)

4 Vp-p

74.1 ns

2 IC601 qf (SCKOUT)

4.6 Vp-p

5 IC601 ws (KFSIO), IC604 qd (CKOUT)

4.4 Vp-p

88.6 ns

6 IC601 wk (LRCKI2), IC604 qg (LRCK)

3.9 Vp-p

• IC Block Diagrams
– DSP Board –

IC604 LC89056W-E

36

CE

37
38

CL

39XSEL

MODE0

MODE1

DOSEL0
DOSEL1

CKSEL0
CKSEL1

XMODE

MICROCOMPUTER

40

41
42DGND
43DVDD

44
45

46
47

48

INTERFACE

DI

DO

35

BPSYNC

ERROR

3334

DGND

ERR9P

31

SAMPLING

FREQUENCY

LOCK

DETECT

DATA

DEMODULATOR

INPUT

CIRCUIT

XSEL

VF

30

DETECT

F2

C BIT

F1

X’ TAL

TIMING

F0

252627282932

PLL

CSFLAG

PA/PB

DETECT

AUDIO

24
23

EMPHA

22

XIN

21

XOUT

20

XMCK
19 DVDD
18 DGND
17

XSTATE
16

DATAO

LRCK

15

BCK

14

CKOUT

13

62.5 ns

– PANEL Board –

1 IC601 id (XOUT)

250 ns

3.5 Vp-p

74.1 ns

3 IC601 ql (LRCKO), IC605 5 (LRCK),

IC606 3 (LRCK (I))

3.8 Vp-p

22.7 µs

4 IC601 w; (BCKO), IC605 4 (BCK),

IC606 1 (BCK (I))

3.6 Vp-p

354 ns

22.7 µs

7 IC601 wl (BCKI2), IC604 qf (BCK)

354 ns

8 IC606 qh (MCLK (I))

3.7 Vp-p

74.1 ns

4 Vp-p

IC605 AK4527

LOOP1

LOOP0/SDA/CDTI

44 43 42 41 40 39 38 37 36 35 34

1

SDOS

I2C

2

SMUTE

3

BICK

4

LRCK

5

SDTI1

6

SDTI2

7

SDTI3

8

SDTO

9

10
11

FORMAT

CONVERTER

12 13 14 15 16 17 18 19 20 21 22

DEM1

DAUX

DFS

1 2 3 4

DOUT

DISEL

DIF1/SCL/CCLK

DIF0/CSN

P/SN

MCLK

DZF1

AUDIO

INTERFACE

PDN

TVDD

DVSS

DVDD

DEM0

DINO

AVSS

ICKS2

AVDD

ICKS1

VREFH

CIRCUIT

OUTPUT
CIRCUIT

ICKS0

DINI

VCOM

INPUT

CAD1

CAD0

5

DIN2

33
32
31
30
29
28
27
26
25
24
23

6

DGND

DZF2
RIN+
RIN–
LIN+
LIN–
ROUT1
LOUT1
ROUT2
LOUT2
ROUT3
LOUT3

7

DVDD

8 9 10

R

VIN

LPF

11

12

AVDD

AGND

1111