Sony SS-CM70 User manual

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)
01-569-008-21 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
C2002.02 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 0or dotted line with
mark 0are critical for safety.
Replace only with part num-
ber specified.
Les composants identifiés par une
marque 0sont critiques pour la
sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.

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

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
(λ= 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
C2002.03 Published by Sony Engineering Corporation
HCD-M70 is the Amplifier, CD player, Tape
Deck andTuner 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

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
TheAC 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 meansofaVOM
or battery-operatedAC 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 2VAC range are suitable. (See Fig.A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µ FAC
voltmete
r
(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 0OR DOTTED
LINE WITH MARK 0ON 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

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

4
HCD-M70 SECTION 1
SERVICING NOTES
The laser diode in the optical pick-up block may suffer electro-
static 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
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
MODEL IDENTIFICATION
– Rear Panel –
SERVICE POSITION
In checking the CD block, prepare jig (extension cable J-2501-
011-B: 1.25 mm Pitch, 19 cores, Length 300 mm).
Part No.
Model Name Part No.
AEP and UK models 4-238-716-0[]
US and Canadian models 4-238-888-0[]
Singapore model 4-238-889-0[]
Mexican model 4-239-812-0[]
Australian model 4-240-890-0[]
Korean model 4-240-891-0[]
Thai model 4-240-892-0[]
Connect jig (extension cable J-2501-011-B)
to the control board (CN805) and CD board (CN101).
control board (CN805)
CD board (CN101)
Any box to put.
In checking the tape deck section, prepare jig (extension cable J-
2501-167-A: 1.25 mm Pitch, 17 cores, Length 300 mm).
TC board (CN301)
main board (CN301)
Connect jig (extension cable J-2501-167-A)
to the main board (CN301) and TC board (CN301).

5
HCD-M70
5
GB
Remote Control
CD REPEAT qk (8)
CD Nws (8, 9)
DIR MODE ql (12–14)
DISPLAY 2(11, 16)
DSG 1(15)
ENTER qd (7, 10, 14, 15, 17)
FM MODE 9(11)
FUNCTION qj (8–14, 18)
MEMORY qh (10)
SLEEP qf (16)
TAPE nN w; (12–14)
TIMER SELECT qs (15, 17)
TIMER SET qg (7, 14, 17)
TUNER/BAND wa (9–11)
TUNING MODE/PLAY MODE
q; (8–11, 14)
VOL +/– qa (17)
BUTTON DESCRIPTIONS
X4(8, 12, 14)
x5(8, 9, 12–14)
./>6(7–10, 14, 15, 17)
m/M7(8–12)
@/1 (power) 3(7, 15, 17)
zREC 8(13)
ALPHABETICAL ORDER
A – M S – V
123
8
5
6
4
9
0
qa
qsqd
qj
qk
qh
qg
qf
ql
w;
wa
ws
7
4
GB
How to use this page
Use this page to find the location of buttons and other
parts of the system that are mentioned in the text.
Illustration number
r
PLAY MODE qg (9, 13, 14)
RR
Name of button/part Reference page
List of Button Locations and Reference Pages
Main unit
ALPHABETICAL ORDER
A – F
CD disc tray 9(8)
CD SYNCHRO qa (13, 14)
CD SYNCHRO indicator w; (14)
CD N7(8, 9)
CD X7(8)
DIRECTION q; (12–14)
Display window 2
DSG qk (15, 18)
FUNCTION ql (8–14, 18)
PHONES jack qf
PLAY MODE/TUNING MODE
qd (8–11, 14)
Remote sensor 4
REPEAT/FM MODE qs (8, 11)
TAPE nN qj (12–14)
TAPE Xqj (12–14)
TUNER AM qg (9–11)
TUNER FM qg (9–11)
TUNING +/– 3(9–11)
VOLUME +/– 6(17)
P – V
BUTTON DESCRIPTIONS
@/1 (power) 1(7, 10, 15, 17)
m/M 3(8, 12)
l/L 3(8, 9, 14)
x 5(8, 12, 13)
Z CD 8(8)
zREC qh (13)
Z
x
nN N
?/1
lm
ML
z
XX
1
3
5
ql
6
7
4
8
9
2
0qaqsqdqf
qh
qg
qk
qj
w;
SECTION 2
GENERAL This section is extracted from
instruction manual.
Setting the clock
1 Turn on the system.
2 Press TIMER SET on the remote.
3 Press ./>on the remote
repeatedly to set the hour.
4 Press ENTER on the remote.
The minute indication flashes.
5 Press ./>on the remote
repeatedly to set the minute.
6 Press ENTER on the remote.
The clock will begin operating.
To adjust the clock
1 Press TIMER SET on the remote.
2 Press .or >on the remote to select
“SET CLOCK”, then press ENTER on the
remote.
3 Do the same procedures as step 3 to 6
above.

HCD-M70
6
SET
3-2. PANEL (SIDE) (L),
PANEL (SIDE) (R)
(page 7)
3-3. TOP PANEL SECTION
(page 7)
3-4. MECHANICAL DECK (TAPE)
(page 8) 3-5. FRONT PANEL SECTION
(page 8)
3-6. BACK PANEL ASSY
(page 9)
3-7. MAIN BOARD
(page 9)
3-8. CD MECHANISM DECK
(CDM55F-K6BD41A)
(page 10)
3-9. BASE UNIT (BU-K6BD41A)
(page 11)
3-10.LOADING BOARD
(page 11)
3-11.CAM (CDM55)
(page 12)
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SECTION 3
DISASSEMBLY

HCD-M70
7
Note: Follow the disassembly procedure in the numerical order given.
3-2. PANEL (SIDE) (L), PANEL (SIDE) (R)
3-3. TOP PANEL SECTION
1 four screws
(BTP3
× 10)
2
3 panel (side) (L)
1 screw
(BTP3
× 10)
4 screw
(BTP3
× 10)
4 four screws
(BTP3
× 10)
5
6 panel (side) (R)
3 wire (flat type) (17 core)
(CN301)
4 top panel section
1 screw
(BTP3 × 10
)
2

HCD-M70
8
3-4. MECHANICAL DECK (TAPE)
3-5. FRONT PANEL SECTION
3 shield case (TC)
5 connector
1 two screws
(BVTP3
× 8)
qs MD bracket (R
)
qa two screws
(BVTT2.6
× 5)
6 screw
(BVTT2.6
× 5)
7
6 two screws
(BVTT2.6
× 5)
1 two screws
(BVTP3
× 8)
9 two screws
(BVTT2.6
× 5)
qd mechanical deck
(tape)
2
0 MD bracket (L)
4 FFC cable 8P
8 TC board
1 FFC cable 20P (CN803)
2 connector
(CN304)
3 three screws
(BTP3 × 10)
4 front panel section
1 FFC cable 18P (CN802)
1 FFC cable 15P (CN801)

HCD-M70
9
3-6. BACK PANEL ASSY
3-7. MAIN BOARD
1 connector
(CN809)
3 back panel assy
2 four screws
(BTP3
× 10)
2 two screws
(BTP3
× 10)
1 FFC cable 21P (CN806)
1 FFC cable 17P (CN804)
2 connector
(CN101)
4 main board
3 screw
(BTP3 × 12)

HCD-M70
10
3-8. CD MECHANISM DECK (CDM55F-K6BD41A)
1 screw
(BVTP3
× 8)
3 Remove the CD mechanism dec
k
in the direction of the arrow.
2 two claws
0 CD mechanism deck
(CDM55F-K6BD41A)
8 two screws
(BTP3
× 8)
4 flexible flat cable (19 core
)
(CN805)
6 four screws
(DIA. 2.6 × 8)
5 connector
(CN807)
7 control board
9 bracket (MPEG)

HCD-M70
11
3-9. BASE UNIT (BU-K6BD41A)
1 floating screw
(PTPWHM2.6)
2 base unit
(BU-K6BD41A)
3-10. LOADING BOARD
2 belt (CDM55)
B
3 Pull the tray pushing B .
4 two screws
(BTP2.6
× 6)
5 loading board
1 Rotate the gear(B) in
the direction of arrow
A .
A

HCD-M70
12
3-11. CAM (CDM55)
2lever (SW)
1torsion spring
6gear (B)
3spacer (55)
4pulley (LDG)
5gear (A)
7roller
8cam (CDM55)

HCD-M70
1313
IC103
TP (RF)
TP (VC)
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjust-
ment.
2. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
5. Check the focus bias check when optical block is replaced.
Focus Bias Check
Procedure :
1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
2. Press the I/1button to turn the power on, and press
the ZCD button to open the CD disc tray.
3. Put disc (YEDS-18) in and press the CD Nbutton to play-
back.
4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
Checking Location:
– CD BOARD (Conductor Side) –
+
–
BD board
TP (RF)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 m
V
TIME/DIV: 500 ns
level:
1.1
± 0.2 Vp-p
s
Note: Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
1. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
2. The adjustments should be performed in the order given in this
service manual.
3. The adjustments should be performed for both L-CH and R-
CH.
REC Bias Adjustment
Procedure:
1. Mode: REC
FUNCTION: VIDEO
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fied values as follows.
If these values are out of specification values, adjust the RV101
(L-CH) and RV201 (R-CH) on the TC board to repeat steps
1and 2.
Specified values:Playback output of 315 Hz to playback
output of 10 kHz: ±0.5 dB
Adjustment Location: TC board
attenuator
set
MAIN board
AUDIO IN (MD/VIDEO) jack (SJ302)
L-CH, R-CH
1) 315 Hz
2) 10 kHz 50 mV (– 23.8 dB)



600 Ω
blank tape
CN-123
AF OSC
+
–
set
recorded
portion
MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH
level meter
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
RV101 (L)
RV201 (R)







REC Bias
Adjustment
– TC BOARD (Component Side) –
SECTION 4
TEST MODE
Start
REC pause for 3 seconds
FWD REC
Fast forward
REV Play
REC pause for 3 seconds
REV REC
Rewind
FWD Play Shut off
Shut off
Shut off
Shut off
1 minute
3 minutes
1 minute
3 minutes
Start
Open the disc tray
Close the disc tray
Play the last track
[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. Turn ON the power.
2. Press three buttons of x, [DSG], and CD Xsimultaneously.
3. The set is reset.
[LIQUID CRYSTAL DISPLAY ALL LIT CHECK
MODE]
Procedure:
1. Set to standby state.
2. Press three buttons of x, [DSG], and
[PLAY MODE/TUNING MODE] simultaneously.
3. Liquid crystal display are all turned on.
4. To exit from this mode, press the I/1button to turn the power
OFF.
[TAPE DECK AGING MODE]
This mode can be used for operation check of tape deck section.
Procedure:
1. Set a tape in the tape deck.
2. Set to standby state.
3. Press three buttons of x, [DSG], and [CD SYNCHRO] si-
multaneously.
4. The aging is executed in bellow sequence.
5. To exit from the aging mode, press the I/1button to turn the
power OFF.
Aging mode sequence:
[CD AGING MODE]
This mode can be used for operation check of CD section.
Procedure:
1. Load a CD disc.
2. Set to standby state.
3. Pressthreebuttonsof x,[DSG], and[REPEAT/FM MODE] simul-
taneously.
4. The aging is executed in bellow sequence.
5. To exit from the aging mode, press the I/1button to turn the
power OFF.
Aging mode sequence:
[CHANGE-OVER MD/VIDEO]
Procedure:
1. Set to standby state.
2. Press the [DSG] and the [FUNCTION] buttons simultaneously.
3. The function change over to MD or VIDEO by turns.
[CHANGE-OVER THE AM TUNING INTERVAL]
(Except AEP and UK models)
•The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the I/1button to turn the power ON.
2. Select the function “TUNER”, and press the [TUNER AM]
button to select the “AM”.
3. Press the I/1button to turn the power OFF.
4. Change over to 9 kHz:
Press the [TUNING --] and the [TUNER AM] buttons simulta-
neously.
Change over to 10 kHz:
Press the [TUNING +] and the [TUNER AM] buttons simulta-
neously.

HCD-M70
1414
I-V AMP
DETECTOR
(TRACKING)
(FOCUS)
2-AXIS DEVICE
LASER DIODE
A
B
C
D
F
E
6
7
8
10
11
4
2
1
5
10
6
7 D+5V
LDPD
VCC
LD
PD
AUTOMATIC
POWER
CONTROL
Q101
5
RF
SUMMING
AMP
RF EQ
AMP
FOCUS
ERROR AMP
TRACKING
ERROR AMP
FI-V AMP
EI-V AMP
APC LD
AMP
APC PD
AMP
4
PD
16
14
13
22
21
RFO
FE
TE
LD ON
HOLD SW
LD
3
ASYMMETRY
CORRECTION
EFM
DEMODULATOR
DIGITAL
PLL
51
49
48
RFAC
ASYI
ASYO
54 56 53 55
FILO
PCO
CLTV
FILI
ERROR
CORRECTOR
16k
RAM
INTERNAL BUS
D/A
INTERFACE SERIAL
IN
INTERFACE
DIGITAL
FILTER
NOISE SHAPER
PWM
&
INTEGRATOR
DIGITAL
OUT
SIGNAL PATH
: CD PLAY (ANALOG)
: CD PLAY (DIGITAL OUT)
60
70
77
D OUT
AOUT1
AOUT2
AIN1
AIN2
51
51
71
76
72
75
LOUT1
LOUT2
BUFFER
CD-L
R-CH
SUBCODE
PROCESSOR
SERVO AUTO
SEQUENCER
CPU INTERFACE
2576208114
SQCK DATA CLOK XLAT SCOR SENS SQSO XLON
TO
MIRR/DFCT/FOK DETECTOR
IC101 (2/2)
9 27
SCLK SSTP
26
MDP
S101
(LIMIT)
TE
FE
RFDC
SE
41 39 4340
A/D
CONVERTER
FOCUS/TRACKING/SLED
PWM GENERATOR
FOCUS/TRACKING/SLED
SERVO DSP
MIRR/DFCT/FOK
DETECTOR
23 2224
DFCT MIRR FOK
TO
SERVO
INTERFACE
IC101 (1/2)
DIGITAL SERVO
PROCESSOR
IC101 (2/2)
14
13
12
11
17
18
15
16
CH1OUTF
CH1OUTR
CH2OUTF
CH2OUTR
CH3OUTF
CH3OUTR
CH4OUTF
CH4OUTR
CH1FIN
CH1RIN
CH2 FIN
CH2RIN
CH3FIN
CH3RIN
2
3
5
6
24
23
MOTOR
DRIVE
MOTOR
DRIVE
COIL
DRIVE
MOTOR
DRIVE
COIL
DRIVE
SPINDLE/SLED MOTOR DRIVE,
FOCUS/TRACKING COIL DRIVE
IC102
MM
M102
(SLED)
M101
(SPINDLE)
CH4SIN 25
33
32
31
30
28
29
FRDR
FFDR
SFDR
SRDR
TRDR
TFDR
MUTE 20
MUTE
Q801
Q800
SERVO
INTERFACE
DIGITAL
CLV
3
XRST
6766
XTAL XTAO
X101
16.9344MHz
TIMING
LOGIC
CLOCK
GENERATOR
OPTICAL
TRANSCEIVER
IC321
OPTICAL
DIGITAL OUT (CD)
CLK, SQSO
CLK
SQSO
A
(Page 16)
B
(Page 15)
CD-ON
C
(Page 16)
RF AMP
FOCUS/TRACKING ERROR AMP
IC103
FILTER DIGITAL SIGNAL PROCESSOR,
DIGITAL FILTER, D/A CONVERTER
IC101 (1/2)
OPTICAL
PICK-UP BLOCK
(KSS-213DCP)
MM
Q800, 801
CD ON SWITCH
R-CH : R-ch is omitted due to same as L-ch.
19
11
10
C-LATCH
18 C-SENSE
100 C-SCOR
86 C-RST
C-SQCK
CD-DATA
13 HOLD
SYSTEM CONTROLLER
IC801 (1/3)
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM – CD SERVO Section –

HCD-M70
1515
MUTING
CONTROL SWITCH
Q404, 405
11
ALC
CLK
(AEP, UK)
TU1
TUNER UNIT
(EXCEPT AEP, UK)
FM75Ω
ANENNA
AM
4
3
5
9
8
10
7
1
TUNER ON SWITCH
Q804
4
13 14
2
DET AMP
Q302 16
12
2
X301
4.332MHz
RDS DECODER
IC326
D321
D401
(AEP, UK)
17
5
8
31
23
14
30
CAPSTAN/REEL
MOTOR DRIVE
Q341, 343
29
1
6
32
95
94
TRIGGER
PLUNGER DRIVE
Q342, 344
MM
(TAPE DECK BLOCK)
6
5
10
2
33
M901
(LOADING)
(CAPSTAN/REEL)
OPEN
CLOSE
MM
LOADING
MOTOR DRIVE
IC320
SIGNAL PATH
: TUNER (FM/AM)
: TAPE PLAY
: REC
FM ANT
ANT GND
ANT GND
AM ANT
L-CH
R-CH R-CH
TUNED
DI
CK
CE
DO
FM DET MUX
X1 X0
RDATA
RCLK
INPUT2
INPUT1
OUT2
OUT1
SYSTEM CONTROLLER
IC801 (2/3)
C-SQSO/RDS-DATA
RDS-IN
TUNED
TU-DATA
C-CLK/TU-CLK
TU-CE
TU-COUNT
ALC
21
REC/PB
MOT-CON
SOL-CON
SENSOR
T-MODE
TC-SW
TRAY-OPEN
TRAY-CLOSE
TRAY-SW S1
DISC TRAY
OPEN/CLOSE DETECT
R-CH : R-ch is omitted due to same as L-ch.
16
REC-MUTE
20
L-MUTE
34 BIN (L)
1513 14
28 27
EQ-OUT (L)
26
PB-OUT
(L)
TAI (L) MUTE
REC/PB EQ AMP, ALC
IC401
A/B
MUTE
REC MUTE
24
23
REC-OUT
(L)
REC-IN
(L)
ALC
(L)
16
R-CH
R-CH
EQ
ALC
BIAS OSC
T401 REC BIAS
SWITCH
Q402, 403
COM +8V
BIAS OSC
Q401
REC BIAS
(L)
MUTING
Q100, 101
RV101
REC BIAS
(R)
RV201
L-CH
R-CH
ERASE
R-CH
HRPE901
(RECORD/PLAYBACK/ERASE)
R-CH
R-CH
T101
BIAS
TRAP
SQSO
D
TU-ON
(Page 16)
B
CLK, SQSO
(Page 14)
E
TU-L (Page 16)
F
TC-L (Page 16)
G
REC-L (Page 16)
FM75Ω
6-2. BLOCK DIAGRAM –TUNER/TAPE DECK Section –

HCD-M70
1616
: TAPE PLAY
: REC
36 – 34
KEY1 – KEY3
50 – 53
COM0 – COM3
LIQUID CRYSTAL
DISPLAY
LCD801
54 – 85
SEG0 – SEG31
SIRCS
3
SDA
88
SCK
28
AU-CE
87
REMOTE CONTROL
RECEIVER
IC802
LED DRIVE
Q807 DSG
D811
LED DRIVE
Q809 CD SYNC
D813
CD-SYNC
26
27
38
99
RST
WP
22AMP-MUTE
24H/P CHK
97AU-MUTE
RESET SIGNAL
GENERATOR
IC803
D801
D802
E
TU-L
(Page 15)
F
TC-L
(Page 15)
A
CD-L
(Page 14)
G
REC-L
(Page 15)
SYSTEM CONTROLLER
IC801 (3/3)
INPUT SELECT SWITCH,
ELECTRICAL VOLUME,
TONE CONTROL
IC323
D814
(STANDBY)
LED DRIVE
Q808
TAPE
D812
TC-ON96
STAND-BY LED
98
LED DRIVE
Q805
LED DRIVE
Q806
CD
D809
TUNER
D811
+5V
REGULATOR
Q306
LED DRIVE
Q810, 811
CD +5V
+9.5V
REGULATOR
Q305
+8V
REGULATOR
IC306
+9.5V
REGULATOR
Q301
7
REG-CON
(Page 15) TU-ON D
(Page 14) CD-ON C
RECT
D906 – 909
RELAY DRIVE
Q902
RECT
D902 – 905
+12V
REGULATOR
Q355
+5V
REGULATOR
Q901, 903
TUNER ON
SWITCH
Q303, 304
CD ON
SWITCH
Q307, 308
AMP +16V
AMP – 16V
D917
RECT
D910 – 913
WAKE UP
SWITCH
Q802, 803
POWER ON
MUTING
Q330
MUTING
CONTROL SWITCH
Q312, 313
DSG
D804, 805,
D807, 808
(LCD BACK LIGHT)
TU +9.5V
COM +8V
CD +8V
COM +12V
25TU-ON
15CD-ON
SW +5V
U-COM +5V
T902
MAIN POWER
TRANSFORMER
T901
SUB POWER
TRANSFORMER
RY901 (Singapore)
(EXCEPT Singapore)
(AC IN)
VOLTAGE
SELECTOR
S901
BACKUP +5V
S801 – 820
3
COM +12V
D309
MUTING
Q408, 409
MUTING
Q100
4
10
14
+
+
–
–
SJ301
L
R
SPEAKER
IMPEDANCE
USE 6 – 16Ω
R-CH
R-CH J301
HEADPHONE AMP
IC324
MOS GAIN &
LEVEL SHIFT
ING STAGE
MOS
OUTPUT
STAGE
SHORT
CIRCUIT
PROTECTION
IN+
IN+
MUT
STANDBY/MUTE
MUTE STBY
POWER AMP
IC101
R-CH
OUT
R-CH
R-CH
DC DETECT
Q310, 311
PHONES
9SPK PROTECT
R-CH
INPUT
SELECT
SWITCH
L4
L3
L1
L2
11
12
14
13 9LIN
10
LSELO 5 LOUT
VOLUME
CONTROL
TONE
CONTROL
301
DI CL
2
CE
CPU
INTERFACE
R-CH
SJ302
L
R
AUDIO IN
MD (VIDEO)
93
92
X800
32.768KHz
39
40
X801
4.19MHz
TEX
TX
EXTAL1
XTAL1
SIGNAL PATH
: TUNER (FM/AM)
: CD PLAY
: MD (VIDEO)
R-CH : R-ch is omitted due to same as L-ch.
POWER ON/OFF
RELAY DRIVE
Q902
TC +5V
+5V
REGULATOR
Q309
+8V
REGULATOR
IC304
9
R-CH
6-3. BLOCK DIAGRAM – MAIN Section –

HCD-M70
1717
Note:
The components identi-
fied by mark 0or dotted
linewithmark0arecriti-
cal for safety.
Replace only with part
number specified.
Note:
Lescomposantsidentifiéspar
une marque 0sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.
6-4. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
•W: indicates side identified with part number.
•f: internal component.
•: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
•Indication of transistor.
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 Ωand 1/4W or less unless otherwise
specified.
•f: internal component.
•C: panel designation.
•A: B+ Line.
•B: B– Line.
•H: adjustment for repair.
•Voltages are takenwithaVOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
•Circled numbers refer to waveforms.
•Signal path.
F: TUNER (FM/AM)
E: TAPE PLAY
a: REC
J: CD PLAY (ANALOG)
c: CD PLAY (DIGITAL OUT)
j: MD (VIDEO)
•Abbreviation
AUS:Australian model
CND : Canadian model
KR : Korean model
MX : Mexican model
SP : Singapore model
TH :Thai model
C
BThese are omitted. E
Q
•Circuit Boards Location
JACK board
SWITCH board
POWER board
VIDEO board
MAIN board
TC board
CONTROL boar
d
CD board
LOADING board

HCD-M70
1818
IC102
IC103
IC101
(LIMIT)
28 15
114
E
12
13
1
24
40
60 61
80
21 20
41
TP (RF)
(SPINDLE)
M
(SLED)
M
TP
(VC)
1-680-693-
11
(11)
A
CONTROL BOARD
CN805
OPTICAL
PICK-UP
BLOCK
(KSM-213DCP)
CD BOARD
A
B
C
D
1 2 3 4
6-5. PRINTED WIRING BOARD – CD Board – • See page 17 for Circuit Boards Location.
IC101 C-3
IC102 B-3
IC103 C-2
Q101 B-2
•Semiconductor
Location
Ref. No. Location
(Page 26)