Sony HCD-EC70 (MHC-EC70 Mini Hi-Fi System) User manual

SERVICE MANUAL
Sony Corporation
Personal Audio Division
Published by SonyTechno Create Corporation
US Model
Canadian Model
COMPACT DISC DECK RECEIVER
9-887-133-02
2006C16-1
© 2006.03
Ver. 1.1 2006.03
SPECIFICATIONS
HCD-EC70
HCD-EC70 is the Amplifier, CD player, Tape
Deck andTuner section in MHC-EC70.
Model Name Using Similar Mechanism NEW
CD Base Unit Name BU-K6BD83S2-WOD
Section Optical Pick-up Name KSM-213DCP
TAPE Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type —
Main unit
AUDIO POWER SPECIFICATIONS
POWER OUTPUTAND TOTAL HARMONIC DISTORTION:
(The United States model only)
With 8 ohm loads, both channels driven, from 150 – 10,000 Hz; rated 80
watts per channel minimum RMS power, with no more than 10% total
harmonic distortion from 250 milliwatts to rated output.
Amplifier section
High frequency AMP:
Continuous RMS power output (reference): 80 + 80 W (8 ohms at
1 kHz, 10% THD)
Low frequency AMP:
Continuous RMS power output (reference): 160 W (4 ohms at
150 Hz, 10% THD)
Inputs
AUDIO IN (stereo mini jack): Sensitivity 800 mV, impedance
47 kilohms
Outputs
PHONES (stereo mini jack): Accepts headphones with an impedance
of 8 ohms or more
SPEAKER: Accepts impedance of 8 ohms
CD player section
System: Compact disc and digital audio system
Laser Diode Properties
Emission duration: continuous
Laser Output*: Less than 44.6 µW
* This output is the value measurement at a distance of 200mm from
the objective lens surface on the Optical Pick-up Block with 7mm
aperture.
Frequency response: 20 Hz – 20 kHz
Signal-to-noise ratio: More than 90 dB
Dynamic range: More than 90 dB
Tape deck section
Recording system: 4-track 2-channel, stereo
Tuner section
FM stereo, FM/AM superheterodyne tuner
Antenna:
FM lead antenna
AM loop antenna
FM tuner section:
Tuning range: 87.5 – 108.0 MHz (100 kHz step)
Intermediate frequency: 10.7 MHz
AM tuner section:
Tuning range: 530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,710 kHz (with 9 kHz tuning interval)
Intermediate frequency: 450 kHz
General
Power requirementsl: AC 120 V, 60 Hz
Power consumption: 198 W
0.5 W (in Power off)
Dimensions (w/h/d): Approx. 200 ×306 ×395 mm
Mass: Approx. 6.4 kg
Design and specifications are subject to change without notice.

2
HCD-EC70
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 3
2. GENERAL ................................................................... 4
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 6
3-2. Side Panel (R)And Side Panel (L) .................................. 7
3-3. Top Section ...................................................................... 7
3-4. Mechanical Deck ............................................................. 8
3-5. Belt (1), Belt (2) .............................................................. 8
3-6. Front Panel Section ......................................................... 9
3-7. PANEL Board.................................................................. 10
3-8. JACK Board..................................................................... 10
3-9. MAIN Board.................................................................... 11
3-10. CD Section And Base Unit
(BU-K6BD83S2-WOD) Section ..................................... 12
3-11. Optical Pick-up (KSM-213DCP), BD83S Board............ 13
3-12. Belt (DLM3A) ................................................................. 14
3-13. Chassis (PT) Section ....................................................... 14
3-14. PT-AC Board, POWER Transformer............................... 15
3-15. LOW-AMP Board, HIGH-AMP Board,
TRANSISTOR Board...................................................... 15
3-16. DC Fan ............................................................................ 16
4. MECHANICAL ADJUSTMENTS......................... 17
5. ELECTRICAL ADJUSTMENTS .......................... 17
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 PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0SUR
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.
6. DIAGRAMS
6-1. Block Diagram — BD/DRIVER Section — .................. 22
6-2. Block Diagram — TUNER Section — .......................... 23
6-3. Block Diagram — MAIN Section —............................. 24
6-4. Printed Wiring Board — BD83S Board — .................... 25
6-5. Schematic Diagram — BD83S Board — ....................... 26
6-6. Printed Wiring Board — MAIN Section — ................... 27
6-7. Schematic Diagram — MAIN Section (1/5) — ............. 28
6-8. Schematic Diagram — MAIN Section (2/5) — ............. 29
6-9. Schematic Diagram — MAIN Section (3/5) — ............. 30
6-10. Schematic Diagram — MAIN Section (4/5) — ............. 31
6-11. Schematic Diagram — MAIN Section (5/5) — ............. 32
6-12. Printed Wiring Board — PANEL Board — ................... 33
6-13. Schematic Diagram — PANEL Board — ...................... 34
6-14. Printed Wiring Board —AMP Section — ..................... 35
6-15. Schematic Diagram — AMP Section — ........................ 36
6-16. Printed Wiring Board — PT-AC Board — ..................... 37
6-17. Schematic Diagram — PT-AC Board —........................ 37
7. EXPLODEDVIEWS
7-1. Overall Section ................................................................ 46
7-2. Front Panel Section ......................................................... 47
7-3. Chassis Section................................................................ 48
7-4. Top Section ...................................................................... 49
7-5. CD Mechanism Deck Section (BU-K6BD83S2-WOD) . 50
8. ELECTRICAL PARTS LIST .................................. 51

3
HCD-EC70
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.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety check before releasing the set to the customer:
Checkthe antennaterminals, metaltrim, “metallized”knobs, screws,
and all other exposed metal parts forAC 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. Acommercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’instructions to use these
instruments.
2. A battery-operatedAC 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-operatedACvoltmeter.The “limit” indication
is 0.75V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive 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
CAUTION
Use of controls or adjustments or performance of procedures
otherthan thosespecifiedherein may result in hazardous radiation
exposure.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
•Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
•Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
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
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 emission,
observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” andcheck
that the S curve waveforms is output three times.
SECTION 1
SERVICING NOTES
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.
When carrying this system
1 Remove all discs to protect the CD mechanism.
2 Hold down CD u(play/pause) on the unit, and press
?/1 until “STANDBY” appears.
3 After “LOCK”appears, unplug the power cord.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
CAUTION

4
HCD-EC70 SECTION 2
GENERAL This section is extracted
from instruction manual.
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6
HCD-EC70 SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
3-3. TOP SECTION
(Page 7)
3-6. FRONT PANEL SECTION
(Page 9)
3-4. MECHANICAL DECK
(Page 8)
3-5. BELT (1), BELT (2)
(Page 8)
3-7. PANEL BOARD
(Page 10)
3-11. OPTICAL PICK-UP (KSM-213DCP),
BD83S BOARD
(Page 13)
3-12. BELT (DLM3A)
(Page 14)
3-16. DC FAN
(Page 16)
3-10. CD SECTION AND BASE UNIT
(BU-K6BD83S2-WOD) SECTION
(Page 12)
3-13. CHASSIS (PT) SECTION
(Page 14)
3-14. PT-AC BOARD,
POWER TRANSFORMER
(Page 15)
3-15. LOW-AMP BOARD,
HIGH-AMP BOARD,
TRANSISTOR BOARD
(Page 15)
3-9. MAIN BOARD
(Page 11)
3-8. JACK BOARD
(Page 10)
3-2. SIDE PANEL (R) AND
SIDE PANEL (L)
(Page 7)
SET

7
HCD-EC70
4 two screws
(+BV3 × 10 )
9 Remove the top section
in the direction of the arrow.
7 connector
(CNP502)
8 connector
(CNP501)
5 two
claws
6 two
dowels
1 screw
(+KTP3 × 10 )
2 screw
(+KTP3 × 10 )
3 three screws
(+BV3 × 10 )
3-2. SIDE PANEL (R) AND SIDE PANEL (L)
3-3. TOP SECTION
3 side panel (R)
6 side panel (L)
5 two screws
(+BV3 × 10 )
2 two screws
(+BV3 × 10 )
1 four screws
(TP3 × 12 )
4 four screws
(TP3 × 12 )
Note: Follow the disassembly procedure in the numerical order given.

8
HCD-EC70
1 Open the cassette box.
3 Slide the lever in the
direction of the arrow.
2 four screws
(+BVTP 2.6 × 8
)
4 mechanical deck
2 belt (2)
1 belt (1)
3-4. MECHANICAL DECK
3-5. BELT (1), BELT (2)

9
HCD-EC70
8 JACK HOLD (B) board
6 Turn the front panel
section.
3 screw
(+KTP3 × 10 )
4 two screws
(+BV3 × 10 )
5 screw
(+KTP3 × 10 )
qa front panel
section
2 wire (flat type)
27core (CNS111)
1 wire (flat type)
13core (CNS671
)
7 two screws
(+BVTP 2.6 × 8 )
9 JACK HOLD (A) board
q; JACK board
3-6. FRONT PANEL SECTION

10
HCD-EC70
3-7. PANEL BOARD
3-8. JACK BOARD
1 two screws
(+BVTP 2.6 × 8 )
5 JACK board
3 JACK HOLD (A) board
2 JACK HOLD (B) board
4 screw
(+BVTP 3 × 6
)
5 PANEL board
3 knob (VOL)
4 claw
2 wire (flat type)
27core (CNS701)
1 fifteen screws
(+BVTP 2.6 × 8
)

11
HCD-EC70
8 four screws
(+BV3 × 10
)
9 screw
(+BV3 × 10 )
7 wire (flat type)
23core (CNS104)
2 wire (flat type)
27core (CNS111)
qs MAIN board
1 connector
(CNP171)
6 connector
(CNP901)
5 connector
(CNP202)
4 connector
(CNP302)
3 connector
(CNP151)
q; connector
(CNP301)
qa Remove soldering from
the three points.
3-9. MAIN BOARD

12
HCD-EC70
3-10. CD SECTION AND BASE UNIT (BU-K6BD83S2-WOD) SECTION
2 four screws
(+BV3 × 10 )
6 two screws (B2.6)
(+BV tapping)
7 two screws
(+BVWH tapping)
8 cover (CD mecha
)
q; CD section and base unit
(BU-K6BD83S2-WOD) section
5 tray panel
4 wire (flat type)
23core
9 wire (flat type)
13core
3 Remove the CD section and base unit
(BU-K6BD83S2-WOD) section in the
direction of the arrow.
1 wire (flat type)
23core (CNS104)

13
HCD-EC70
8 Remove soldering from
the four points.
7 wire (flat type) (16 core)
(CN301)
q; BD83S board
9 optical pick-up
(KSM-213DCP)
4 two screws (+PTPWHM 2.6)
1 two screws (+PTPWHM 2.6)
2 two coil springs (insulator)
3 two insulators
5 two coil springs (insulator)
6 two insulators
3-11. OPTICAL PICK-UP (KSM-213DCP), BD83S BOARD

14
HCD-EC70
2 two screws
3 cover
4 belt (DLM3A)
5 belt (DLM3A)
1 two screws
1 two screws
(+BV3 × 10 )
2 four screws
(+BV3 × 10
)
3 rear cabint
5 four screws
(+BVTP4 × 12 )
4 Remove soldering from
the two points.
6 chassis (main mold)
8 HOLD board
7 screw
(+BV3 × 10 )
9 AC cord
3-12. BELT (DLM3A)
3-13. CHASSIS (PT) SECTION

15
HCD-EC70
3 four screws
(+BV4 × 8 )
4 PT-AC board,
power transformer
1 screw
(+BV3 × 10 )
2 lead
5 screw
(+BV3 × 10 )
1 connector
(CNP201)
4 LOW-AMP board
9 TRANSISTOR
board
7 HIGH-AMP board
6 two transisitor
screws
2 screw
(+BV3 × 10 )
3 two transisitor
screws
8 screw
(+BV3 × 10 )
3-14. PT-AC BOARD, POWERTRANSFORMER
3-15. LOW-AMP BOARD, HIGH-AMP BOARD,TRANSISTOR BOARD

16
HCD-EC70
2 DC fan
1 two screws
(+BV3 × 10 )
3-16. DC FAN

17
HCD-EC70
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
2. Turn the adjustment screwand check outputpeaks. If thepeaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak
0 dB=0.775 VDECK SECTION
set
JACK board
PHONES jack
(J102)
+
–
level meter
test tape
P-4-A063
(6.3 kHz,
− 10 dB)
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
•TestTape
Tape Signal Used for
P-4-A063 6.3 kHz, -10 dB Azimuth Adjustment
set
test tape
P-4-A063
(6.3 kHz, − 10 dB) oscilloscope
VH
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good wrong
JACK board
PHONES jack
(J102)
•Precaution
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head magnetizer close to the
erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, appiy suitable locking compound to
the parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
•Torque Measurement
•TapeTension Measurement
Mode Tension Meter Meter Reading
FWD CQ-403A more than 80 g
(more than 2.82 oz)
2.0 – 8.0 mN • m
(20 to 80 g • cm)
(0.28 – 1.12 oz • inch)
0.15 – 0.6 mN • m
(1.5 to 6 g • cm)
(0.021 – 0.083 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
5 – 17.7 mN • m
(50 to 177 g • cm)
(0.7 – 2.48 oz • inch)
CQ-102AS
CQ-102C
CQ-201AS
CQ-201B
Mode
FWD
FWD
back tension
FF
REW
Torque meter Meter reading
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS

18
HCD-EC70
Checking Location:
+
–
BD83S board
TP (RFACI)
TP (VC)
oscilloscope
(DC range)
Procedure :
1. Connect oscilloscope to TP (RFACI) and TP (VC) on the
BD83S board.
2. Press the I/1button to turn the power ON, and press
the Z(CD) button to open the CD disc tray.
3. Set disc (YEDS-18) on the tray and press the CDubutton
to playback.
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.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
0.9
± 0.4 Vp-p
TP
(VC)
TP
(RFACI)
IC201
– BD83S Board (SIDE B) –
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
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 following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
Adjustment Location: Record/Playback/Erase Head

19
HCD-EC70
TUNER SECTION 0 dB=1 µV
[AM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: AM
[FM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
•Repeat the procedures in each adjustment several times.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: 54 dBuV
60 cm
set
loop antenna A loop antenna B
+
–
level mete
r
32 Ω
JACK board
PHONES jack (J102)
FM RF signal
generator
75kHz frequency
deviation by 1K Hz
signal
Output level: as low as possible
(8dBuV)
+
–
level meter
set
32 Ω
0.01 µ F
JACK board
PHONES jack (J102)
MAIN board
ANTENNA
CNP802 pin 1
MAIN board
ANTENNA
CNP802 pin
2
digital voltmeter
100 k Ω
MAIN board
TP (TUNER VT)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L852 530 kHz 1.5 ±0.1 V
Confirmation 1,710 kHz 8 ±0.5 V
AMTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L851 530 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L805 87.5 kHz 1.75 ±0.1 V
Confirmation 108 kHz 6.2 ±0.5 V
FMTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L804 98 MHz
Adjustment Location: MAIN board (See page 20).
[FM DETECTOR ADJUSTMENT]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
1. Tune the set to 98 MHz.
2. Adjust L806 so that modulation distortion may become the
best in the vicinity of the maximum value where the tuner out
level becomes –15dBuV or more.
FM RF signal
generator
Carrier frequency: 98MHz
Modulation:
deviation by FM 75 kHz
Output level: 60 dBuV
+
–
level meter
MAIN board
TP (TUNER GND)
MAIN board
IC801 pin
qs
(TUNER OUT L-ch)
set
MAIN board
ANTENNA
CNP802 pin 2
MAIN board
ANTENNA
CNP802 pin 1

20
HCD-EC70
Adjustment Location and Connecting Points
IC801
TP (TUNER VT)
TP (TUNER GND)
CNP802
ANTENNA
1
3
L851
AM TRACKIN
G
ADJUSTMENT
FM TRACKING
ADJUSTMENT
(TUNER GND)
(TUNER VT)
FM FREQUENCY
COVERRANGE
ADUJUSTMENT
AM FREQUENCY
COVERRANGE
ADUJUSTMENT
L852
L806
L804
L805
FM DETECTOR
ADUJUSTMENT
– MAIN BOARD (Component side) –
– MAIN BOARD (Conductor side) –
IC801 pin qs
(TUNER OUT L-ch)