Sony MDXC-670-RDS Service manual

MDX-C670/C670RDS

SERVICE MANUAL

US Model

Canadian Model

E Model

MDX-C670

AEP Model

UK Model

MDX-C670RDS

Refer to RM-X2S/X3S Service Manual (9-960-039∏) issued previously for information of remote commander (RM-X2S) supplied with this set.

MD player section

Signal-to-noise ratio 90 dB Frequency response 10 – 20,000 Hz Wow and flutter Below measurable limit

Tuner section FM

Tuning range MDX-C670 :

FM tuning interval : 50 kHz/200 kHz switchable

87.5 – 108.0 MHz (at 50 kHz step)

87.5 – 107.9 MHz (at 200 kHz step)

MDX-C670RDS :

87.5 – 108.0 MHz Aerial terminal External antenna connector Intermediate frequency 10.7 MHz Usable sensitivity 10 dBf Selectivity 75 dB at 400 kHz Signal-to-noise ratio 62 dB (stereo),

65 dB (mono)

Harmonic distortion at 1 kHz

0.9% (stereo),

0.5% (mono) Separation 35 dB at 1 kHz Frequency response 30 – 15,000 Hz Capture ratio 2dB

Photo : MDX-C670RDS

SPECIFICATIONS

AM (MDX-C670)

Tuning range AM tuning interval :

MW/LW (MDX-C670RDS)

Tuning range MW : 531 – 1,602 kHz

Antenna terminal External antenna connector Intermediate frequency 10.71 MHz/450 kHz Sensitivity AM, MW : 30 µV

Power amplifier section

Outputs Speaker outputs

Speaker impedance 4 – 8 ohms Maximum power output 35 W × 4 (at 4 ohms)

Model Name Using Similar Mechanism NEW Base Mechanism Type Optical Pick-up Name KMS-241A/J2N

9 kHz/10 kHz switchable 531 – 1,602 kHz (at 9 kHz step) 530 – 1,710 kHz (at 10 kHz step)

LW : 153 – 281 kHz

LW : 50 µV

(sure seal connectors)

– Continued on next page –

MG-164K-138

MDX-C670

FM/AM MINIDISC PLAYER

MDX-C670RDS

MICROFILM

FM/MW/LW MINIDISC PLAYER

General

Output Line out (2)

Power antenna relay control lead Power amplisier control lead Telephone mute control lead (MDX-C670) Illumination control lead

Tone controls Bass ± 10 dB at 100 Hz

Treble ± 10 dB at 10 kHz

Power requirements 12 V DC car battery (negative ground) Dimensions Approx. 188 × 58 × 174 mm (w/h/d) Mounting dimensions Approx. 178 × 50 × 162 mm (w/h/d) Mass Approx. 1.1 kg Supplied accessories Rotary remote (1)

Parts for installation and connections (1 set) Front panel case (1)

U.S. and foreign patents liscensed from Dolby laboratories Licensing Corporation.

Design and specifications are subject to change without notice.

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 solder-

ing or unsoldering.

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.

CAUTION

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

TABLE OF CONTENTS

1. SERVICE NOTE ......................................................... 2

2. GENERAL ..................................................................... 3

3. DISASSEMBLY............................................................ 7

4. ELECTRICAL ADJUSTMENTS ........................... 12

5. DIAGRAMS

5-1. Printed Wiring Boards –MD Section– .............................. 15

5-2. Schematic Diagram –MD Section– .................................. 17

5-3. Schematic Diagram –MAIN Section–.............................. 22

5-4. Printed Wiring Board –MAIN Section– ........................... 27

5-5. Printed Wiring Board –DISPLAY Section– ..................... 31

5-6. Schematic Diagram –DISPLAY Section– ........................ 33

6. EXPLODED VIEWS .................................................. 35

7. ELECTRICAL PARTS LIST.................................. 39

SECTION 1

SERVICE NOTE

• Note on replacing the MAIN board (German model)

As the repair parts of MAIN board with mounted parts destined for German model, the MAIN board with mounted parts for AEP model is supplied. Accordingly, when replacing the board, exchange two following parts.

R61 12k n 4.7k (1-216-065-00) R71 12k n 4.7k (1-216-065-00)

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR 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 D ANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

[MAIN BOARD] (Conductor Side)

R71

R61

IC751

– 2 –

SECTION 2

GENERAL

This section is extracted from MDX-C670 instruction manual.

– 3 –

– 4 –

– 5 –

– 6 –

SECTION 3

DISASSEMBLY

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

FRONT PANEL

Push the button (release).

COVER ASS’Y, PANEL (SUB) ASS’Y

Remove the front panel of the arrow.

cover ass’y

panel (sub) ass’y

five screws (PTT2.6 × 6)

– 7 –

screw (PTT2.6 × 6)

MECHANISM DECK (MG-164K-138)

mechanism deck (MG-164K-138)

two screws (PTT2.6 × 4)

MAIN BOARD

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

main board

eight screws (PTT2.6 × 8)

heat sink

two screws (PTT2.6 × 8)

– 8 –

SERVO BOARD

sensor flexible board (CN102)

two screws (BVTT2 × 4)

servo board

flexible board (CN103)

FLOAT BLOCK

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

float block

Release of the lock.

lever (lock R) lever (lock L)

spring (FL2)

MD cover ass’y

four screws (BVTT2 × 4)

two springs (FL)

– 9 –

spring (FL2)

HOLDER ASS’Y

spring (CHKG)

stop ring E (1.5)

lever (lock R)

holder ass’y

lever (lock L)

stop ring E (1.5)

washer (M)

spring (CHKG)

OPTICAL PICK-UP (MD) (KMS-241A/J2N)

screw (B2 × 3)

optical pick-up (MD) (KMS-241A/J2N)

two screws (K2 × 3)

shaft (SL2)

bearing (SL)

screw (K2 × 3)

feed screw ass’y

– 10 –

MOTOR ASS’Y (M901, M902, M903), SENSOR BOARD

screw (P1.7 × 1.8)

two screws (P1.7 × 1.8)

motor ass’y (M901)

!™

motor ass’y (M903)

!¡

screw (P2 × 2.2)

motor ass’y (M902)

screw (B2 × 3)

base (SL)

bracket (SL)

two screws (2 × 8)

sensor board

Remove the solders of motor (M901, M902, M903).

– 11 –

SECTION 4

ELECTRICAL ADJUSTMENTS

TEST MODE

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

4. Adjust with the volume RV2 on TU1 so that the “FM” indication turns to “FM0” indication on the display window. But, in case of already indicated “FM0”, turn the RV2 so that put out light “0” indication and adjustment.

1. Set the “power select” switch (S702) is “ON” position.

2. Turn ON the regulated po wer supply . (All LEDs on the set lights up, and the clock is displayed.)

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

3. Push the preset 4 button.

4. Push the preset 5 button.

5. Press the preset 1 button for more than two seconds.

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

1. Push the OFF button.

MD SECTION

MD section adjustments are done automatically in this set.

TUNER SECTION

0dB=1µV

Cautions during repair

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

FM Auto Scan/Stop Level Adjustment

Setting:

SOURCE button: FM

FM RF signal

generator

0.01µF

Carrier frequency : 98.0 MHz Output level : 22 dB (12.6 Mode : mono Modulation : 1 kHz, 22.5 kHz deviation (30%)

antenna

terminal

set

Display

REG

Adjustment Location: See page 14.

FM Stereo Separation Adjustment

Setting:

SOURCE button: FM

FM RF signal

generator

0.01µF

Carrier frequency : 98.0 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%)

antenna terminal

set

10 k

LINE OUT

Procedure:

FM Stereo

signal generator

output channel

Level meter Level meter

connection reading (dB)

L-CH L-CH A

R-CH L-CH Adjust RV4 on TU1

for minimum reading.

R-CH R-CH C

L-CH R-CH Adjust RV4 on TU1

for minimum reading.

SHUF1

VTVM

Ω

+ –

Procedure:

1. Set to the test mode. (See page 12).

2. Push the SOURCE button and set to FM.

Display

REG

3. Push the preset 3 button.

Display

REG

SHUF1

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

Specification: Separation more than 30dB

Adjustment Location: See page 14.

– 12 –

AM (MW) Auto Scan/Stop Level Adjustment

(

)

Setting:

SOURCE button (MDX-C670) : AM SOURCE button (MDX-C670RDS): MW

Ω

15 pF

65 pF

AM RF signal

generator

AM dummy antenna

(50 Ω)

Carrier frequency : 999 kHz 30% amplitude modulation by 1 kHz signal Output level : 33 dB

44.7 µV

set

antenna terminal

Procedure:

1. Set to the test mode. (See page 12.)

2. Push the SOURCE button and set to AM (MDX-C670) or MW (MDX-C670RDS).

Display

REG

SHUF1

RDS S-Meter Adjustment (MDX-C670RDS)

Setting:

SOURCE button: FM

FM RF signal

generator

0.01µF

Carrier frequency : 98.0 MHz Output level : 35 dB (56.2 Mode : mono Modulation : no modulation

antenna

terminal

set

Procedure:

1. Set to the test mode. (See page 12.)

2. Push the SOURCE button and set to FM.

Display

REG

SHUF1

3. Push the preset 10 button.

4. Adjust RV1 on MAIN board so that the display indication is “15.8”.

Display

REG

SHUF1

3. Push the preset 3 button.

Display

REG

SHUF1

4. Adjust with the volume R V1 on TU1 so that the “AM” or “MW” indication turns to “AM0” or “MW0” indication on the display window. But, in case of already indicated “AM0” or “MW0”, turn the RV1 so that put out light “0” indication and adjustment.

Display

REG

SHUF1

*1 : MDX-C670RDS is indicates “MW”.

Adjustment Location: See page 14.

Specification: Display indication : 15.6 to 16.4

Adjustment Location: See page 14.

– 13 –