Sony MDX-C7970/C7970R Service Manual

MICROFILM

SERVICE MANUAL

Model Name Using Similar Mechanism MDX-C7900/C7900R
Base Mechanism Type MG-164N-138
Optical Pick-Up Name KMS-241B/J1NP

US Model

Canadian Model

E Model

MDX-C7970

AEP Model

UK Model

MDX-C7970R

SPECIFICATIONS

MDX-C7970/C7970R

Photo: MDX-C7970R

FM/AM(MW/LW) MINIDISC PLAYER

– Continued on next page –

For RM-X4S (Remote Commander),
please refer to RM-X4S Service Manual
(9-925-698-∏) previously issued.

– 2 –

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C dur­ing repairing.

• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering
or unsoldering.

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

SAFETY-RELATED COMPONENT WARNING!!

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

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra­diation exposure.

The laser diode in the optical pick-up block may suffer electro­static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.

NOTES ON LASER DIODE EMISSION CHECK

Never look into the laser diode emission from right avove when
checking it for adustment. It is feared that you will lose your sight.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(KMS-241B/J1NP)

The laser diode in the optical pick-up block may suffer electro­static break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board. Also perform m easures
against electrostatic break-down suff iciently before the operation.
The flexible board is easily damaged and should be handled with
care.

laser-tap

OPTICAL PICK-UP FLEXIBLE BOARD

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE !
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

– 3 –

1. GENERAL

Location of Controls ....................................................... 4

Resetting the Unit ........................................................... 5

Detaching the Front Panel............................................... 5

Preparing the Rotary Commander .................................. 5

Setting the Clock............................................................. 5

Using the Rotary Commander ........................................ 5

Adjusting the Sound Characterisitics ............................. 5

Attenuating the Sound .................................................... 5

Changing the Sound and Display Settings ..................... 6

Boosting the Bass Sound ................................................ 6

Installation....................................................................... 7

Connections..................................................................... 8

2. DISASSEMBLY ......................................................... 12

3. ELECTRICAL ADJUSTMENTS

Test Mode........................................................................ 18

MD Section ..................................................................... 18

Tuner Section .................................................................. 18

4. DIAGRAMS

4-1. Block Diagram – SERVO Section – ............................... 23

4-2. Block Diagram – TUNER Section – .............................. 25

4-3. Block Diagram – MAIN Section – ................................. 27

4-4. Block Diagram

– DISPLAY/KEY CONTROL Section –........................ 29

4-5. Block Diagram

– BUS CONTROL/POWER SUPPLY Section – ........... 31

4-6. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 33

4-7. Printed Wiring Boards – SERVO Section – ................... 35

4-8. Schematic Diagram – SERVO Board (1/3) – ................. 37

4-9. Schematic Diagram – SERVO Board (2/3) – ................. 39

4-10. Schematic Diagram – SERVO Board (3/3) – ................. 41

4-11. Printed Wiring Board

– MAIN Board (Component Side) – .............................. 43

4-12. Printed Wiring Board

– MAIN Board (Conductor Side) – ................................ 45

4-13. Schematic Diagram – MAIN Board (1/4) – ................... 47

4-14. Schematic Diagram – MAIN Board (2/4) – ................... 49

4-15. Schematic Diagram – MAIN Board (3/4) – ................... 51

4-16. Schematic Diagram – MAIN Board (4/4) – ................... 53

4-17. Printed Wiring Board – DISPLAY Board – ................... 55

4-18. Schematic Diagram – DISPLAY Board – ...................... 57

4-19. Printed Wiring Board – SUB Board – ............................ 59

4-20. Schematic Diagram – SUB Board – ............................... 61

4-21. IC Pin Function Description ........................................... 69

5. EXPLODED VIEWS ................................................ 79

6. ELECTRICAL PARTS LIST ............................... 83

TABLE OF CONTENTS

– 4 –

SECTION 1

GENERAL

This section is extracted from
instruction manual.

– 5 –

– 6 –

– 7 –

– 8 –

– 9 –

– 10 –

– 11 –

– 12 –

SECTION 2

DISASSEMBLY

SUB PANEL ASS’Y

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

MECHANISM DECK (MG-164N-138)

2

two claws

4

sub panel ass’y

1

three screws

(PTT2.6 × 6)

3

connector

(CN901)

2

cla

w

1

screw

(PTT2.6 × 6)

1

two screws
(PTT2.6

×

4)

3

mechanism deck
(MG-164N-138)

2

connector
(CN200)

– 13 –

MAIN BOARD, HEAT SINK

SERVO BOARD

2

two screws
(BVTT2

×

4)

1

sensor flexible board
(CN102)

2

two screws
(BVTT2

×

4)

1

flexible boar

d

(CN103)

3

servo board

4

insulating sheet

3

main board

2

three screws
(PTT2.6 × 6) (ground point)

1

two screws
(PTT2.6 × 10)

6

heat sink

5

eight screws
(PTT2.6 × 10)

– 14 –

MD COVER ASS’Y

FLOAT BLOCK

1

four screws
(B2

×

3)

3

MD cover ass’y

2

Pushing the Cassette Holder toward the direction A with a
screwdriver, etc., disengage the Shaft (MD Cover Guide) from
the slot in the MD Cover Ass’y.

Note:Take care not to scratch the Optiocal Pick-up when pushing

the Cassette Holder with a screwdriver. etc.

shaft (MD cover guide)

cassette holder

A

1

tension spring (FL2)

1

tension spring (FL2

)

2

two tension springs (FLOAT F)

3

Pushing an arrow A part, raise the float block
up ward at the front to release a lock.

A

float block

lever (lock R)
lever (lock L)

– 15 –

LO MOTOR ASS’Y (LOADING) (M903)

LEVER (LE) ASS’Y

4

Remove the bracket (LO)
in the direction of the arrow

A

.

1

Remove solders of motor. (M903)

5

LO motor ass’y (loading)
(M903)

2

tension spring (rack)

3

claw

A

2

stopper washer

2

lever (LE) ass’y

3

roller (GLE)

1

– 16 –

HOLDER ASS’Y

CHUCKING ARM ASS’Y

1

Remove the chucking arm ass’y
in the direction of the arrow.

holder ass’y

2

type-E stop ring 1.5

2

type-E stop ring 1.5

3

lever (lock L)

2

type-E stop ring 1.5

2

type-E stopring 1.5

4

Remove the holder ass’y in the
direction of the arrow.

1

spring (CHKG)

1

spring (CHKG)

3

lever (lock R)

– 17 –

OPTICAL PICK-UP (KMS-241B/J1NP)

SL MOTOR ASS’Y (SLED) (M902), SP MOTOR ASS’Y (SPINDLE) (M901)

6

bearing (SL)

5

feed screw ass’

y

3

screw
(K2 × 3)

2

shaft (SL2)

1

two screws
(K2 × 3)

7

optical pick-up
(KMS-241B/J1NP)

4

screw
(B2 × 3)

4

screw
(P1.7 × 1.8)

5

bracket (SL)

9

two screws
(P1.7 × 1.8)

!º

retainer (SP)

!¡

SP motor ass’y
(spindle) (M901)

7

screw
(B2 × 3)

2

two screws
(2 × 8)

3

sensor board

1

Remove solders of motors.
(M901, M902)

8

base (SL)

6

SL motor ass’y
(sled) (M902)

– 18 –

TEST MODE

This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM (MW) Auto Scan/Stop Lev el adjustments
can be performed easier than it in ordinary procedure.

<Set the Test Mode>

1. Turn ON the regulated po wer supply . ( The clock is displayed)

Note: Press the [OFF] button, if the clock is not displayed.

2. Push the preset [4] button.

3. Push the preset [5] button.

4. Press the preset [1] button for more than two seconds.

5. Then the display indicates all lights, the test mode is set.

<Release the Test mode>

1. Push the [OFF] button.

MD SECTION

MD section adjustments are done automatically in this set.

3. Adjust the volume RV2 on TU1 by turning clockwise untill
“0” is shown next to “FM” on the display window, If “0” is
already shown or the volume RV2 has been turned too far,
turn it back counterclockwise untill “0” is disappeared once,
then try this adjustment.

Display

SECTION 3

ELECTRICAL ADJUSTMENTS

See the adjustment location from on page 22 for the ad­justment.

TUNER SECTION

0 dB=1 µV

Cautions during repair

When the tuner unit is defective, replace it by a new one be­cause its internal block is difficult to repair.

Note: Adjust the tuner section in the sequence shown below.

1. FM Auto Scan/Stop Level Adjustment

2. FM Stereo Separation Adjustment (MDX-C7970)

3. FM Stereo Separation Adjustment (Wide) (MDX-C7970R)

4. FM Stereo Separation Adjustment (Narrow) (MDX-C7970R)

5. FM RDS S-Meter Adjustment (MDX-C7970R)

6. AM (MW) Auto Scan/Stop Level Adjustment

FM Auto Scan/Stop Level Adjustment

Setting:

[SOURCE] button : FM

FREQUENCY SELECT switch: FM 200 k (E model)

Procedure:

1. Set to the test mode.

2. Push the

[SOURCE] button and set to FM.

Display

set

antenna jack (CN1)

FM RF signal

generator

Carrier frequency: 97.9 MHz (MDX-C7970)

98.0 MHz (MDX-C7970R)

Output level : 22 dB (12.6

µ

V)
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%)

0.01

µ

F

SHUF

*1

SHUF

*1

*1: MDX-C7970R indicates “98.00”.

Adjustment Location: See page 22.

– 19 –

FM Stereo

Level meter Level meter

signal generator

connection reading (dB)

output channel

L-CH L-CH A

B

L-CH R-CH Adjust RV3 on TU1

for minimum reading.
R-CH R-CH C
R-CH L-CH D

FM Stereo

Level meter Level meter

signal generator

connection reading (dB)

output channel

L-CH L-CH A

B

R-CH L-CH Adjust RV4 on TU1

for minimum reading.

R-CH R-CH C

D

L-CH R-CH Adjust RV4 on TU1

for minimum reading.

FM Stereo Separation Adjustment (MDX-C7970)

Setting:

[SOURCE] button : FM

FREQUENCY SELECT switch: FM 200 k (E model)

Procedure:

FM RF signal

generator

Carrier frequency : 97.9 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 33.75 kHz deviation (45%)

sub : 1 kHz, 33.75 kHz deviation (45%)

: 19 kHz pilot: 7.5 kHz deviation (10%)

0.01 µF
set

antenna jack (J1)

+
–

LINE OUT jack (CNP300)

level meter

10 k

Ω

FM Stereo Separation Adjustment (Wide) (MDX-C7970R)

Setting:

[SOURCE] button : FM
[SHIFT] button : ON (light up SET UP and PLAY MODE)
Preset [4] (PLAY MODE) →
[5] (→) buttons : WIDE mode

FM RF signal

generator

Carrier frequency : 98.00 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 33.75 kHz deviation (45%)

sub : 1 kHz, 33.75 kHz deviation (45%)

: 19 kHz pilot: 7.5 kHz deviation (10%)

0.01 µF
set

antenna jack (J1)

+
–

level meter

10 k

Ω

LINE OUT jack (CNP300)

(75

Ω)

Procedure:

1. Adjust the volume RV3 on FM/AM tuner unit (TU1) for the
best separation.

L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.

Specification: Separation more than 24 dB

Adjustment Location: See page 22.

L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.

Specification: Separation more than 30 dB

Adjustment Location: See page 22.

– 20 –

FM Stereo

Level meter Level meter

signal generator

connection reading (dB)

output channel

L-CH L-CH A

B

L-CH R-CH Adjust RV4 on TU1

for minimum reading.
R-CH R-CH C
R-CH L-CH D

FM Stereo Separation Adjustment (Narrow)
(MDX-C7970R)

Setting:

[SOURCE] button : FM
[SHIFT] button : ON (light up SET UP and PLAY MODE)
Preset [4] (PLAY MODE) →
[5] (→) buttons : NARROW mode

FM RF signal

generator

Carrier frequency : 98.00MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 20 kHz deviation (26.7%)

sub : 1 kHz, 20 kHz deviation (26.7%)

: 19 kHz pilot: 7.5 kHz deviation (10%)

0.01 µF
set

antenna jack (J1)

+
–

level meter

10 k

Ω

(75

Ω)

LINE OUT jack (CNP300)

FM RDS S-Meter Adjustment (MDX-C7970R)

Setting:

[SOURCE] button : FM

Procedure:

1. Set to the test mode. (See page 18)

2. Push the

[SOURCE] button and set to FM.

Display

set

antenna jack (J1)

FM RF signal

generator

Carrier frequency : 98.00 MHz
Output level : 35 dB (56.2

µ

V)
Mode : mono
Modulation : no modulation

0.01

µ

F

SHUF

SHUF

Procedure:

1. Adjust the volume RV4 on FM/AM tuner unit (TU1) for the
best separation.

3. Push the preset

[10] button .

4. Adjust RV1 on MAIN board so that the display indication is
“13.2”.

Display

Specification: Display indication: 13.0 to 13.4

Adjustment Location: See page 22.

L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.

Specification: Separation more than 18 dB

Adjustment Location: See page 22.

– 21 – – 22 –

MW Auto Scan/Stop Level Adjustment

Setting:

[SOURCE] n [MODE] button : AM (MDX-C7970)

MW (MDX-C7970R)

FREQUENCY SELECT switch : AM 10 k (E model)

Procedure:

1. Set to the test mode. (See page 18)

2. Push the

[SOURCE] button and set to FM.

3. Push the

[MODE] button and set to AM or MW.

Display

4. Adjust with the volume RV1 on TU1 so that the “AM” or “MW”
indication turns to “AM0” or “MW0” indication on the dis­play window.
But, in case of alredy indicated “AM0” or “MW0”, turn the
RV1 so that put out light “0” indication and adjustment.

Display

*2: MDX-C7970R indicates “MW”.
*3: MDX-C7970R indicates “999”.
*4: Only MDX-C7970R indicates.

Adjustment Location: See page 22.

AM RF signal

generator

Carrier frequency : 1000 kHz (MDX-C7970)

999 kHz (MDX-C7970R)
30% amplitude
modulation by
1 kHz signal
Output level : 33 dB

(

44.7 µV

)

(50 Ω)

set

AM dummy antenna

30

Ω

15 pF

65 pF

antenna jack (J1)

SHUF

TP

*3

*2

*4

SHUF

TP

*3

*2

*4

Adjustment Location:

– SET UPPER VIEW –

RV1 RDS S-Meter Adjustment (MDX-C7970R)

TU1

RV1 AM (MW) Auto Scan/Stop Level Adjustment
RV2 FM Auto Scan/Stop Level Adjustment

FM Stereo Separation Adjustment (MDX-C7970)
FM Stereo Separation Adjustment (Narrow) (MDX-C7970R)

RV3 FM Stereo Separation Adjustment (Wide) (MDX-C7970R)

RV4

MDX-C7970/C7970R

– 23 – – 24 –

SECTION 4
DIAGRAMS

4-1. BLOCK DIAGRAM – SERVO Section –

F

C B
D A

E

I J

J

I

B

A

C
D

E
F

DETECTOR

1
2

J

I

4
5
6
7

A
B
C
D

8
9

E
F

LDPD

LASER DIODE

ILCC

PD

OPTICAL PICK-UP
(KMS-241B/J1NP)

AUTOMATIC

POWER

CONTROL

Q302

11

10

APC

PD

LD/PD

AMP

12

APCREF

I-V
AMP

I-V
AMP

AT

AMP

B.P.F.

29 30

WBL

ADFM

ADIN

32

ADFG

ABCD

AMP

FOCUS

ERROR AMP

TRACKING

ERROR AMP

35

34

26
28

ABCD

FE

TE
SE

V-I

CONVERTER

20

F0CNT

WBL3TEQ

+3.3V

SERIAL/

PARALLEL

CONVERTER,

DECODER

COMMAND

1716 18

SWDT

SCLK

XLAT

RF AMP

B.P.F.

46

RFO

40

RF AGC

& EQ

AGCI

EQ

38

RF

RF AMP,

FOCUS/TRACKING ERROR AMP

IC302

TEMP

48 47

MORFO

MORFI

3T

PEAK &
BOTTOM

WBL

33

AUX

73 62

37

PEAK

36

BOTM

FOCUS/TRACKING COIL DRIVE,

SPINDLE/SLED MOTOR DRIVE

IC303

6
8

OUT4F
OUT4R

M

M901

(SPINDLE)

27
25

OUT2F
OUT2R

M

M902

(SLED)

21
23

OUT1F
OUT1R

12
10

OUT3F
OUT3R

FCS+

FCS–
TRK+
TRK–

2-AXIS
DEVICE

(TRACKING)

(FOCUS)

3
4

IN4R
IN4F

29
30

IN2F
IN2R

19
18

IN1F
IN1R

14
15

IN3F
IN3R

SPFD
SPRD

IC306

92
91

88
89

86
85

83

APCREF

SFDR
SRDR

FFDR
FRDR

TFDR
TRDR

16PSB

PWM GENERATOR

AUTOMATIC

POWER

CONTROL

DIGITAL

SERVO

SIGNAL

PROCESS

7465647566 63

ANALOG MUX

A/D CONVERTER

AUTO

SEQUENCER

13

FROM CPU
INTERFACE

DIGITAL SERVO

SIGNAL PROCESSOR

IC301 (2/2)

RECP

PEAK HOLD

Q301

+3.3V

ABCD

AUX1

AUX2

ABCD

FE

TE

SE

PEAK

BOTM

81

80

82

XLRF
CKRF
DTRF

EFM/ACIRC

ENCODER/DECODER

SHOCK PROOF

MEMORY CONTROLLER

ATRAC

ENCODER/DECODER

PLL

FILTER

59
58
61
60

FILI
PCO
CLTV
FILO

100

EFMO

23

ADDT

IC301 (1/2)

15

TX

COMPA-

RATOR

51

52
55

ASYO

ASYI
RFI

ADIP

DEMODULATOR/

DECODER

78

ADFG

SPINDLE

SERVO

79

F0CNT

94 93

SPFD

SPRD

SUBCODE

PROCESSOR

24

SAMPLING

RATE

CONVERTER

DIGITAL

AUDIO

INTERFACE

22

21

DIN

DOUT

DIGITAL SIGNAL PROCESSOR,

EFM/ACIRC ENCODER/DECODER,

SHOCK PROOF MEMORY CONTROLLER,

ATRAC ENCODER/DECODER, 2M BIT D-RAM

IC301 (1/2)

DADT

INTERNAL BUS

D-RAM

CLOCK

GENERATOR

2526 27

512FS OSC

IC304

XBCK

LRCK

FS256

BCK

LRCK

FS256

X301

22.5792MHz

16

OSCI

17

OSCO

CPU

INTERFACE

MONITOR
CONTROL

10

XRST

12

DQSY11SQSY14XINT

9 8 5 6 7

SENS

SRDT

SWDT

SCLK

XLAT

LEVEL SHIFT

IC502

51331

61242

LEVEL SHIFT

IC503

1 2 3 4

MNT0

MNT1

MNT2

MNT3

13

135

12

246

FOK

SHOCK

XBUSY

SLOCK

SWDT

SCLK

XLAT

59 62 55 54 52 45 51 64 26 27 28 29

MNT0

MNT1

MNT2

MNT3

67

A-MUTE

21

LOCK

39

TEMP

MD-RST

SQSY

CC-XINT

SENS

MD-SI

MD-SO

MD-CKO

MD-LAT

7 6

EJECT

LOAD

5 4

05

1 7

M

RIN FIN

OUT1 OUT2

LOADING

MOTOR DRIVE

IC305

M903

(LOADING)

63

C-SW

LOADING START/
EJECT END

E-SW

LIMIT-IN

(LIMIT)
LOADING
END

ON:When the disc loading start

and the disc eject completion.

ON:When completion of

the disc loading.

ON:When the optical pick-up is

inner position.

31

32

EXTAL

XTAL

X501

10MHz

TH501

66

DEEMP

47, 46, 48, 49

1, 2, 24, 25

D0 – D3

32 – 29, 34 – 38, 43

9 – 12, 14 – 18, 5

A0 – A9

D0 – D3A00 – A09

41 22
45 3
44 4
42 23

XOE
XWE
XRAS
XCAS

OE
WE
RAS
CAS

D-RAM

IC307

(Page 27)

A

DADT, BCK, LRCK, FS256

(Page 27)

C

LOCK

MD-ATT

(Page 27)

D

(Page 27)

B

EMPHASIS

MD MECHANISM CONTROLLER

IC501 (1/2)

• SIGNAL PATH
: MD PLAY

11 56

RESET, EMPHASIS

RESET

MDX-C7970/C7970R

– 25 –

– 26 –

4-2. BLOCK DIAGRAM – TUNER Section –

1

4

2

FM-ANT

AM-ANT

6

VCO

21

FM/AM-IF

20

SD

5

5 283

24

10

16

9

13 12

69

100

15

68

VT

13

AM OSC

24

DATA

CLOCK

SSTOP

SDA

OSCOUT

OSCIN

SCL

SSTOP

BAND (9K-10K)

WIDE

53

S-METER (VSM)

SD-IN

83

ST-MONO

62

TU-ATT

LP AM

2

LP HC

1

LP FM

LP OUT

FM IN

25

AM IN

IF FM

14

IF AM

NARROW

51

QUALITY

35

NS-MASK

14

VDDA

7

VDDD

81

19

S-METER15S-METER (RDS)

18

16

12

FM-LCH

FM-RCH

(C7970R) (C7970R)

AM-DET

23

FM-DET

FILTER

AM OSC
BUFFER

Q4

X1

10.25MHz

FM/AM PLL

IC100

05

• SIGNAL PATH
: FM
: AM (MW/LW)

MUTING

Q101

BUFFER

Q50

MUTING

CONTROL SWITCH

Q103

BAND-PASS

FILTER

IC101

R-CH

R-CH

D5

FM/AM TUNER UNIT

TU1

MASTER CONTROLLER

IC700 (1/4)

LO/DX

11

SEEK13SEEK

22

ST/MONO

SEEK

FM/AM SIGNAL
METER BUFFER

Q1

B+ SWITCH

Q51

J1

(FM/AM ANTENNA)

8

FM +B

FM B+

FM B+

10

AM +B

AM B+
TUNER B+

BACKUP +5V

9

+B

WIDE/NARROW

SWITCH

Q7

66

82

Q8

WIDE/
NARROW
SWITCH

WIDE/NARROW

52

MPDH (MTP)

67

DAVN

RDS DECODER

IC102

INTERFACE

REGISTER

IIC BUS

SLAVE

TRANSCEIVER

OSCILLATOR

& CLOCK

X2

4.332MHz

4

8

5

OSCI

OSCO

10

9

SDA

SCL

DAVN

57 kHz

BAND-PASS

FILTER

CLOCKED

COMPARATOR

RDS/RDBS

DEMODULATOR

& DECODER

SIGNAL

QUALITY

DECODER

16

18

19

MPX

CIN

4

5

SC

OUT

MULTI
PATH

DETECTOR

20

2

LVIN

MPTH

Q5
NOISE DET
DISCHARGE

SWITCH

FM RDS

S-METER

RV1

(C7970: E model)

(C7970R)

(C7970)

(C7970)(C7970R)(C7970)(C7970)

(C7970)

(C7970R)

21

FM-IF

(C7970R)

11

AM-IF

(C7970R)

DATA

CLOCK

DATA, CLOCK

(Page 27)

G

FM

(Page 27)

E

AM

(Page 27)

F

S701

MW 10K/FM 200K

MW 9K/FM 50K

FREQUENCY SELECT

SEEKOUT