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SERVICE MANUAL
Ver 1.0 2002.02
MICRO Hi-Fi COMPONENT SYSTEM
CMT-M70/M70K
CMT-M70
CMT-M70K
COMPACT DISC DECK
HCD-M70
RECEIVER SYSTEM
SPEAKER SYSTEM
SS-CM70
US Model
Canadian Model
AEP Model
UK Model
Australian Model
CMT-M70
E Model
CMT-M70/M70K
SPECIFICATIONS
Power requirements
North American model:
120 V AC, 60 Hz
European model:
230 V AC, 50/60 Hz
Mexican model:
120 V AC, 60 Hz
Australian model:
230 V AC, 50/60 Hz
Thailand model:
220 V AC, 50/60 Hz
Other model:
110 - 120 V or 220 - 240 V AC, 50/60 Hz
Adjustable with voltage selector
Power consumption
European model:
See the nameplate
0.5 W (in the standby mode)
Other model:
See the nameplate
Dimensions (w/h/d):
Approx. 159
× 217 × 315 mm incl. projecting
parts and controls
Mass:
Approx. 4.5 kg
Supplied accessories:
Remote Commander (1)
AM loop antenna (1)
FM wire antenna (1)
Batteries (2)
Design and specifications are subject to change without notice.
· CMT-M70/M70K are composed of following models.
As for the service manual, it is issued for each component model,
then, please refer to them.
COMPONENT MODEL NAME
1-477-239-11
REMOTE COMMANDER (RM-S171)
1-501-374-11
ANTENNA, LOOP (AM)
1-501-659-61
ANTENNA (FM) (M70:US, CND, MX, SP, TH)
1-754-060-11
ANTENNA (FM) (M70:AEP, UK, AUS/M70K)
0 1-569-008-21
ADAPTOR, CONVERSION 2P (M70:SP)
4-230-866-01
COVER (BATTERY) (for RM-S171)
4-239-398-11
OPERATING INSTRUCTIONS (ENGLISH)
(M70:US, CND, AEP, UK, AUS, SP)
4-239-398-21
OPERATING INSTRUCTIONS (FRENCH, SPANISH)
(M70:AEP, SP)
4-239-398-31
OPERATING INSTRUCTIONS (FRENCH)
(M70:US, CND)
4-239-398-41
OPERATING INSTRUCTIONS (SPANISH) (M70:MX)
4-239-398-51
OPERATING INSTRUCTIONS (GERMAN, DUTCH,
ITALIAN, SWEDISH, POLISH) (M70:AEP)
4-239-398-61
OPERATING INSTRUCTIONS
(TRADITIONAL CHINESE) (M70:SP)
4-239-399-11
OPERATING INSTRUCTIONS (DANISH, FINNISH)
(M70:AEP)
4-239-399-21
OPERATING INSTRUCTIONS (PORTUGUESE)
(M70:AEP)
4-239-399-31
OPERATING INSTRUCTIONS (RUSSIAN) (M70:AEP)
4-239-400-11
OPERATING INSTRUCTIONS (GREEK) (M70:AEP)
4-239-400-21
OPERATING INSTRUCTIONS (HUNGARIAN, CZECH)
(M70:AEP)
4-239-400-31
OPERATING INSTRUCTIONS (TURKISH) (M70:AEP)
4-239-400-41
OPERATING INSTRUCTIONS (SLOVAKIAN)
(M70:AEP)
4-240-943-11
OPERATING INSTRUCTIONS (KOREAN) (M70K)
4-240-943-21
OPERATING INSTRUCTIONS (ENGLISH, THAI)
(M70:TH)
ACCESSORIES
Part No.
Description
Remark
9-873-632-01
Sony Corporation
2002B0500-1
Home Audio Company
C
2002.02
Published by Sony Engineering Corporation
· Abbreviation
AUS : Australian model
CND : Canadian model
MX : Mexican model
SP
: Singapore model
TH
: Thai model
The components identified by
mark 0 or dotted line with
mark 0 are critical for safety.
Replace only with part num-
ber specified.
Les composants identifiés par une
marque 0 sont critiques pour la
sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.


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2
CMT-M70/M70K
REVISION HISTORY
Clicking the version allows you to jump to the revised page.
Also, clicking the version at the upper right on the revised page allows you to jump to the next revised
page.
Ver.
Date
Description of Revision
1.0
2002.02
New


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SERVICE MANUAL
Tape player section
Recording system
4-track 2-channel stereo
Frequency response
50 - 13,000 Hz (
±3 dB),
using a Sony TYPE I
cassette
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
North American model:
87.5 - 108.0 MHz
(100-kHz step)
Other models:
87.5 - 108.0 MHz
(50-kHz step)
Antenna
FM wire antenna
Antenna terminals
75 ohms unbalanced
Intermediate frequency
10.7 MHz
AM tuner section
Tuning range
Pan-American model:
530 - 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 - 1,710 kHz
(with the tuning interval
set at 9 kHz)
European model:
531 - 1,602 kHz
(with the tuning interval
set at 9 kHz)
Amplifier section
For the U.S. model
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
With 6-ohm loads, both channels driven, from
70 - 20,000 Hz; rated 18 watts per channel
minimum RMS power, with no more than 0.9%
total harmonic distortion from 250 milliwatts to
rated output.
North American model:
Continuous RMS power output (reference):
20 + 20 W
(6 ohms at 1 kHz, 10%
THD)
Total harmonic distortion less than 0.07% (6 ohms at
1 kHz, 12 W)
European model:
DIN power output (rated): 15 + 15 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
20 + 20 W
(6 ohms at 1 kHz, 10%
THD)
Music power output (reference):
40 + 40 W
DIN power output (rated): 15 + 15 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
18 + 18 W
(6 ohms at 1 kHz, 10%
THD)
The following measured at 220 V AC, 60 Hz
DIN power output (rated): 12 + 12 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
15 + 15 W
(6 ohms at 1 kHz, 10%
THD)
Inputs
AUDIO IN MD (VIDEO) (phono jacks):
Sensitivity 500/250 mV,
impedance 47 kilohms
Outputs
OPTICAL DIGITAL OUT (CD):
Optical
PHONES:
Accepts headphones with
an impedance of 8 ohms
or more
SPEAKER:
6 ohms
Other models:
The following measured at 230 V AC, 60 Hz
CD player section
System
Compact disc and digital
audio system
Laser
Semiconductor laser
(
= 780 nm)
Emission
duration: continuous
Wavelength
780 - 790 nm
Frequency response
2 Hz - 20 kHz (
±0.5 dB)
MICRO Hi-Fi COMPONENT SYSTEM
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
SPECIFICATIONS
HCD-M70
Ver 1.1 2002.03
9-873-633-02
Sony Corporation
2002C0500-1
Home Audio Company
C
2002.03
Published by Sony Engineering Corporation
HCD-M70 is the Amplifier, CD player, Tape
Deck and Tuner section in CMT-M70/M70K.
­ Continued on next page ­
CD
Model Name Using Similar Mechanism
HCD-CP100
Section
CD Mechanism Type
CDM55F-K6BD41A
Optical Pick-up Name
KSS-213DCP
TAPE
Model Name Using Similar Mechanism
NEW
Section


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2
HCD-M70
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers' instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The "limit" indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
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.
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 PUB-
LISHED BY SONY.
General
Power requirements
North American model:
120 V AC, 60 Hz
European model:
230 V AC, 50/60 Hz
Mexican model:
120 V AC, 60 Hz
Australian model:
230 V AC, 50/60 Hz
Thailand model:
220 V AC, 50/60 Hz
Other models:
110 - 120 V or 220 -
240 V AC, 50/60 Hz
Adjustable with voltage
selector
Power consumption
European model:
See the nameplate
0.5 W (in the standby
mode)
Other models:
See the nameplate
Dimensions (w/h/d)
Approx. 159
× 217 ×
315 mm incl. projecting
parts and controls
Mass
Approx. 4.5 kg
Design and specifications are subject to change
without notice.
Other models:
530 - 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 - 1,602 kHz
(with the tuning interval
set at 9 kHz)
Antenna
AM loop antenna, external
antenna terminal
Intermediate frequency
450 kHz


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3
HCD-M70
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
The following caution label is located inside the unit.
CAUTION
: INVISIBLE LASER RADIATION WHEN OPEN AND
INTERLOCKS DEFEATED.
AVOID EXPOSURE TO BEAM.
ADVARSEL : USYNLIG LASERSTRÅLING VED ÅBNING NÅR
SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE
FOR STRÅLING.
VORSICHT : UNSICHTBARE LASERSTRAHLUNG, WENN
ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG
ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN.
VARO!
: AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT-
TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
VARNING
: OSYNLING LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD
OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.
ADVERSEL : USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG
SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.
VIGYAZAT! : A BURKOLAT NYITÁSAKOR LÁTHATATLAN LÉZERSU-
GÁRVESZÉLY! KERÜLJE A BESUGÁRZÁST!
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.
Flexible Circuit Board Repairing
·Keep the temperature of the soldering iron around 270 °C dur-
ing 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.
TABLE OF CONTENTS
1.
SERVICING NOTES ............................................... 4
2.
GENERAL ................................................................... 5
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
6
3-2. Panel (Side) (L), Panel (Side) (R) ..................................
7
3-3. Top Panel Section ............................................................
7
3-4. Mechanical Deck (Tape) .................................................
8
3-5. Front Panel Section .........................................................
8
3-6. Back Panel Assy ..............................................................
9
3-7. MAIN Board ...................................................................
9
3-8. CD Mechanism Deck (CDM55F-K6BD41A) ................ 10
3-9. Base Unit (BU-K6BD41A) ............................................. 11
3-10. Loading Board ................................................................. 11
3-11. Cam (CDM55) ................................................................ 12
4.
TEST MODE .............................................................. 13
5.
ELECTRICAL ADJUSTMENTS
Deck Section ................................................................... 13
CD Section ...................................................................... 13
6.
DIAGRAMS
6-1. Block Diagram ­ CD SERVO Section ­ ....................... 14
6-2. Block Diagram ­ TUNER/TAPE DECK Section ­ ...... 15
6-3. Block Diagram ­ MAIN Section ­ ................................ 16
6-4. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 17
6-5. Printed Wiring Board ­ CD Board ­ ............................. 18
6-6. Schematic Diagram ­ CD Board ­ ................................ 19
6-7. Printed Wiring Board ­ TC Board ­ .............................. 20
6-8. Schematic Diagram ­ TC Board ­ ................................. 21
6-9. Schematic Diagram ­ MAIN Board (1/2) ­ .................. 22
6-10. Schematic Diagram ­ MAIN (2/2)/JACK Boards ­ ...... 23
6-11. Printed Wiring Boards ­ MAIN/JACK Boards ­ .......... 24
6-12. Printed Wiring Boards
­ CONTROL/LOADING/VIDEO Boards ­ .................. 26
6-13. Schematic Diagram ­ CONTROL/LOADING/
SWITCH (1/2)/VIDEO Boards ­ ................................... 27
6-14. Printed Wiring Board ­ SWITCH Board ­ ................... 28
6-15. Schematic Diagram ­ SWITCH Board (2/2) ­ ............. 29
6-16. Printed Wiring Board ­ POWER Board ­ ..................... 30
6-17. Schematic Diagram ­ POWER Board ­ ........................ 31
6-18. IC Pin Function Description ........................................... 34
7.
EXPLODED VIEWS
7-1. Panel (Side) Section ........................................................ 36
7-2. Front Panel Section ......................................................... 37
7-3. Top Panel Section ............................................................ 38
7-4. Chassis Section-1 ............................................................ 39
7-5. Chassis Section-2 ............................................................ 40
7-6. CD Mechanism Deck (CDM55F-K6BD41A) ................ 41
7-7. Base Unit (BU-K6BD41A) ............................................. 42
8.
ELECTRICAL PARTS LIST ............................... 43