MICROFILM
SERVICE MANUAL
MDX-C670/C670RDS
Refer to RM-X2S/X3S Service Manual (9-960-039-
) issued previously for information of remote
commander (RM-X2S) supplied with this set.
Photo : MDX-C670RDS
Model Name Using Similar Mechanism
NEW
Base Mechanism Type
MG-164K-138
Optical Pick-up Name
KMS-241A/J2N
SPECIFICATIONS
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
AM (MDX-C670)
Tuning range
AM tuning interval :
9 kHz/10 kHz switchable
531 1,602 kHz (at 9 kHz step)
530 1,710 kHz (at 10 kHz step)
MW/LW (MDX-C670RDS)
Tuning range
MW : 531 1,602 kHz
LW : 153 281 kHz
Antenna terminal
External antenna connector
Intermediate frequency
10.71 MHz/450 kHz
Sensitivity
AM, MW : 30
µV
LW : 50
µV
Power amplifier section
Outputs
Speaker outputs
(sure seal connectors)
Speaker impedance
4 8 ohms
Maximum power output
35 W
× 4 (at 4 ohms)
Continued on next page
US Model
Canadian Model
E Model
MDX-C670
AEP Model
UK Model
MDX-C670RDS
MDX-C670
FM/AM MINIDISC PLAYER
MDX-C670RDS
FM/MW/LW MINIDISC PLAYER
2
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
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 Cor-
poration.
Design and specifications are subject to change without notice.
CAUTION
Use of controls or adjustments or performance of pro-
cedures other than those specified herein may result in
hazardous radiation exposure.
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.
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 COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS
LES SUPPLÉMENTS PUBLIÉS PAR SONY.
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)
[MAIN BOARD] (Conductor Side)
R71
R61
IC751
3
SECTION 2
GENERAL
This section is extracted from
MDX-C670 instruction manual.
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5