Sony HCD-EC50 User manual

SERVICE MANUAL
Sony Corporation
Personal Audio Division
Published by SonyTechno Create Corporation
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
COMPACT DISC DECK RECEIVER
9-879-904-04
2006C16-1
© 2006.03
Ver. 1.3 2006.03
SPECIFICATIONS
HCD-EC50
HCD-EC50 is the Amplifier, CD player, Tape
Deck andTuner section in MHC-EC50.
Main unit
AUDIO POWER SPECIFICATIONS
POWER OUTPUTAND TOTAL HARMONIC DISTORTION:
(The United States model only)
With 6 ohm loads, both channels driven, from 120 – 10,000 Hz; rated 50 watts
per channel minimum RMS power, with no more than 10% total harmonic
distortion from 250 milliwatts to rated output.
Amplifier section
Continuous RMS power output (reference): 50 + 50 W (6 ohms at 1 kHz,
10% THD)
North-American model :
DIN poewer output (rated): 24 + 24W (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 30 + 30W (6 ohms at 1 kHz,
10% THD)
Music power output (reference): 60 + 60W
DIN poewer output (rated): 40 + 40W (6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference): 50 + 50W (6 ohms at 1 kHz,
10% THD)
European model :
The following are measured at AC 240V, 50/60 Hz (Australian model) ,
AC 120V, 220 or 240V, 50/60 Hz (other models)
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 6 ohms
CD player section
System: Compact disc and digital audio system
Laser Diode Properties
Emission duration: continuous
Laser Output*: Less than 44.6µW
* 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
North American models: 87.5 – 108.0 MHz (100 kHz step)
Other models: 87.5 – 108.0 MHz (50 kHz step)
Intermediate frequency: 10.7 MHz
AM tuner section:
Tuning range
Norhe American models: 530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,710 kHz (with 9 kHz tuning interval)
Other models: 530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,602 kHz (with 9 kHz tuning interval)
European model: 530 – 1,602 kHz (with 9 kHz tuning interval)
Intermediate frequency: 450 kHz
General
Power requirements
North American model: AC 120V, 60Hz
European model: AC 230V, 50/60Hz
Australian model: AC 230-240V, 50/60Hz
Other models: AC 120V, 220-230V or 240V, 50/60Hz
Adjustable with voltage selector
Power consumption
North American model: 75W
European model: 70W 0.5W (in Power off)
Other models: 95W
Design and specifications are subject to change without notice.
Model Name Using Similar Mechanism NEW
CD Base Unit Name BU-K6BD83S-WOD
Section Optical Pick-up Name KSM-213DCP/C2NP
TAPE Model Name Using Similar Mechanism NEW
Section Tape Transport Mechanism Type H21SB-C05
$IMENSIONSWHDEXCLSPEAKERS!PPROX¾¾MM
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/THERMODELS!PPROXKG

2
HCD-EC50
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 3
2. GENERAL ................................................................... 4
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 6
3-2. Side Panel (L) And Side Panel (R) .................................. 7
3-3. Top Section ...................................................................... 7
3-4. Front Panel Section ......................................................... 8
3-5. PANEL Board.................................................................. 8
3-6. JACK Board..................................................................... 9
3-7. MAIN Board.................................................................... 9
3-8. CD Section And Base Unit
(BU-K6BD83S-WOD) Section ....................................... 10
3-9. Chassis (main mold) ........................................................ 11
3-10. PT Board And Power Transformer .................................. 11
4. MECHANICAL ADJUSTMENTS......................... 12
5. ELECTRICAL ADJUSTMENTS .......................... 12
6. DIAGRAMS
6-1. Block Diagram — BD/DRIVER Section — .................. 18
6-2. Block Diagram — TUNER Section — .......................... 19
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.
6-3. Block Diagram — MAIN Section — ............................. 20
6-4. Printed Wiring Board — BD Section — ........................ 21
6-5. Schematic Diagram — BD Section — ........................... 22
6-6. Printed Wiring Board — MAIN Section — ................... 23
6-7. Schematic Diagram — MAIN Section (1/3) — ............. 24
6-8. Schematic Diagram — MAIN Section (2/3) — ............. 25
6-9. Schematic Diagram — MAIN Section (3/3) — ............. 26
6-10. Printed Wiring Board — PANEL Section — ................. 27
6-11. Schematic Diagram — PANEL Section — .................... 28
6-12. Printed Wiring Board — AMP Section — ..................... 29
6-13. Schematic Diagram — AMP Section — ........................ 30
6-14. Printed Wiring Board — POWER Section —................ 31
6-15. Schematic Diagram — POWER Section — .................. 31
7. EXPLODEDVIEWS
7-1. Overall Section ................................................................ 38
7-2. Front Panel Section ......................................................... 39
7-3. Chassis Section................................................................ 40
7-4. Top Section ...................................................................... 41
7-5. CD Section And Base Unit
(BU-K6BD83S-WOD) Section ....................................... 42
8. ELECTRICAL PARTS LIST .................................. 43

3
HCD-EC50
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 antenna terminals,metal trim, “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 229or 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
VOMor 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 those specifiedhereinmay result in hazardousradiation
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”and check
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-EC50 SECTION 2
GENERAL This section is extracted
from instruction manual.
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9OUCANFALLASLEEPTOMUSIC4HISFUNCTIONWORKSEVENIF
THECLOCKISNOTSET
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ȿ
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CURRENTDISCORTAPESTOPSORINMINUTES
)FTHETAPEDECKISSTILLPLAYINGORRECORDINGATTHESET
TIMETHESYSTEMTURNSOFFAFTERTHETAPEDECKSTOPS
0LAY4IMER
9OUCANWAKEUPTO#$ORTUNERATAPRESETTIME
5SEBUTTONSONTHEREMOTETOCONTROLTHE0LAY4IMER
-AKESUREYOUHAVESETTHECLOCK
 0REPARETHESOUNDSOURCE
0REPARETHESOUNDSOURCEANDTHENPRESS6/,5-%
nORTURNTHE6/,5-%CONTROLONTHEUNIT
ȷ
TO
ADJUSTTHEVOLUME
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ANDTHENPRESS%.4%2
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 5SETHESAMEPROCEDUREASINSTEPTOSETTHE
TIMETOSTOPPLAYING
 3ELECTTHESOUNDSOURCE
0RESSÃÑ
ȯ
REPEATEDLYUNTILTHEDESIRED
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ȼ
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DISPLAYSHOWSTHETIMERSETTINGS
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TOTURNOFFTHESYSTEM
)FTHESYSTEMISONATTHEPRESETTIMETHE0LAY4IMER
WILLNOTPLAY
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MANUALLY

6
HCD-EC50 SECTION 3
DISASSEMBLY
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
3-3. TOP SECTION
(Page 7)
3-4. FRONT PANELSECTION
(Page 8)
3-6. JACK BOARD
(Page 9)
3-5. PANEL BOARD
(Page 8)
3-8. CD SECTION AND BASE UNIT
(BU-K6BD83S-WOD) SECTION
(Page 10)
3-9. CHASSIS (MAIN MOLD)
(Page 11)
3-10. PT BOARD AND
POWER TRANSFORMER
(Page 11)
3-7. MAIN BOARD
(Page 9)
3-2. SIDE PANEL (L) AND
SIDE PANEL (R)
(Page 7)
SET

7
HCD-EC50
3-2. SIDE PANEL (L) AND SIDE PANEL (R)
3 side panel (R)
6 side panel (L)
5 two screws
(BV3 × 10 )
2 two screws
(BV3 × 10 )
1 four screw
s
(TP3 × 12 )
4 four screws
(TP3 × 12 )
3-3. TOP SECTION
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 )

8
HCD-EC50
3-4. FRONT PANEL SECTION
5 screw
(KTP3 × 10 )
7 two screws
(BV3 × 10 )
4 screw
(BV3 × 10 )
6 screw
(KTP3 × 10 )
8 front panel section
2 wire (flat type)
27core (CNS111)
3 wire (flat type)
13core (CNS671
)
1 connector
(CNP171)
3-5. PANEL BOARD
5 PANEL board
3 knob (VOL)
4 claw
2 wire (flat type)
27core (CN5701)
1 fifteen screws
(BVTP2.6 × 8 )

9
HCD-EC50
3-6. JACK BOARD
1 two screws
(BVTP2.6 × 8
)
3 JACK board
2 JACK HOLD board
3-7. MAIN BOARD
4 two screws
(BV3 × 10 )
5 screw
(BV3 × 10 )
3 screw
(BV3 × 10 )
6 MAIN board
2 wire (flat type)
27core (CNS111)
1 wire (flat type)
23core (CNS104)

10
HCD-EC50
3-8. CD SECTION AND BASE UNIT (BU-K6BD83S-WOD) SECTION
2 four screws
(BV3 × 10 )
7 CD section and base unit
(BU-K6BD83S-WOD) section
6 tray panel
4 wire (flat type)
23core
5 wire (flat type)
13core
3 Remove the CD section and base unit
(BU-K6BD83S-WOD) section in the
direction of the arrow.
1 wire (flat type)
23core (CNS104)

11
HCD-EC50
3-9. CHASSIS (MAIN MOLD)
1 eight screws
(BV3 × 10 )
2 rear cabint
4 six screws
(BVTP4 × 12 )
3 Remove soldering from
the two points
8 chassis (main mold)
6 HOLD board
5 screw
(BV3 × 10 )
7 AC cord
3-10. PT BOARD AND POWERTRANSFORMER
1 four screws
(BV4 × 8 )
2 PT board,
power transformer

12
HCD-EC50
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
2. Turn theadjustment screwand check output peaks. 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
•Tape Tension 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

13
HCD-EC50
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

14
HCD-EC50
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 (US and Canadian models)
Adjustment Part Frequency Display Reading on Digital Voltmeter
L852 530 kHz 1.5 ±0.1 V
Confirmation 1,710 kHz 8 ±0.5 V
AM FREQUENCY COVERAGE ADJUSTMENT (Other models)
Adjustment Part Frequency Display Reading on Digital Voltmeter
L852 531 kHz 1.5 ±0.1 V
Confirmation 1,602 kHz 7.2 ±0.5 V
AMTRACKING ADJUSTMENT (US and Canadian models)
Adjust for a maximum reading on level meter
L851 530 kHz
AMTRACKING ADJUSTMENT (Other models)
Adjust for a maximum reading on level meter
L851 531 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 15).
[FM DETECTOR ADJUSTMENT]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
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
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.
Ver. 1.2

15
HCD-EC50
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
AM Tracking
Adjustment
L851
L852
FM Tracking
Adjustment
FM Detector
Adjustment
FM Frequency
Coverage Adjustment
L805
L806
L804
AM Frequency
Coverage Adjustment
TUNER-VT
TUNER-GND
– MAIN BOARD (Conductor Side) –
TP(TUNER-VT)
TP(TUNER-GND)
IC801
1
112 18
1936
3ANTENNA
CNP802
IC801 pin qs
(TUNER OUT L-ch)

16
HCD-EC50
Note on Schematic Diagram:
•All capacitors are in µF unless otherwise noted. (p: pF)
50WV 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.
•2: nonflammable resistor.
•5: fusible resistor.
•C: panel designation.
•H: adjustment for repair.
•A: B+ Line.
•B: B– Line.
•Voltages are taken with aVOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
– BD Section –
No mark: CD PLAY
– Other Section –
No mark: FM
(): TAPE PLAY
〈〉: TAPE REC
[]:CD STOP
•Circled numbers refer to waveforms.
•Signal path.
F: TUNER (FM)
f: TUNER (AM)
J: CD
d: AUX
E: PB (TAPE)
a: REC (TAPE)
•Abbreviation
AUS:Australian model
CET : East Europian and Russian models
CND : Canadian model
E3 : 240V AC area in E model
KR : Korean model
SP : Singapore model
Note on PrintedWiring Boards:
•X: parts extracted from the component side.
•Y: parts extracted from the conductor side.
• f: internal component.
•: Pattern from the side which enables seeing.
•Indication of transistor.
C
BThese are omitted. E
Q
B
These are omitted.
CE
Q
Note:
The components identi-
fied by mark 0or dot-
ted line with mark 0are
critical for safety.
Replace only with part
number specified.
Note:
Les composants identifiés
par une marque 0sont cri-
tiques pour la sécurité.
Neles remplacer queparune
piéce portant le numéro
spécifié.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
THIS NOTE IS COMMON FOR PRINTEDWIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
SECTION 6
DIAGRAMS
Ver. 1.3

1717
HCD-EC50
HCD-EC50
TRANSISTOR board
AMP board
GUARD (B) board
(E3, SP, KR, AUS models)
MAIN board
JACK board
PANEL board
PT board
BD83S board
• Circuit Boards Location •Waveforms
– MAIN Board –
1 IC801 w; (XOUT)
13.3 µ s2.2 Vp-p
5 V/DIV, 10
µ s/DIV
2 IC701 qd (X0A/P90)
30.5 µ s2.5 Vp-p
1 V/DIV, 10
µ s/DIV
3 IC701 od (X0)
239 ns 2.9 Vp-p
1 V/DIV, 100 ns/DIV
4 IC201 u; (RFACO)
(CD PLAY mode)
200 mV/DIV, 500 ns/DIV
5 IC201 <z/, (XTAO)
(CD PLAY mode)
1 V/DIV, 20 ns/DIV
6 IC201 1(LRCK)
(CD PLAY mode)
1 V/DIV, 10 µ s/DIV
7 IC201 5(BCK)
(CD PLAY mode)
1 V/DIV, 200 ns/DIV
0.5 to 1.3 Vp-p
59.1 ns 3.3 Vp-p
22.7 µ s3.3 Vp-p
472 ns 3.4 Vp-p
– BD83S Board –
– PANEL Board –
Ver. 1.3

1818
HCD-EC50
HCD-EC50
6-1. BLOCK DIAGRAM — BD/DRIVER SECTION —
Q669,670
Q671,672
Q665,666
Q667,668
A
MAIN
SECTION
(Page 20)
M1
+
-
+
-
M
SCOR P67/AN7/INT2
XLAT-MP3 P35/IC1
IREQ-MP3 P74/SDA/SC2
DATA-MP3 P30/SO3
CLK-MP3 P31/SC3
ACK-MP3 P75/SCL/SO2
REQ-MP3 P37/OCU1
M-MUTE
P41/LED1
P43/LED3
P45/LED5/TOT0
P44/LED4
P47/LED7/TOT2
P46/LED6/TOT1
P51/TIN1
P52/TIN2/PPGO
P53/PPG1
P42/LED2
P50/TINO
P36/OCU0
P54/SI0
P55/SC0
P33/TMCK
P56/SO0
P26
P76
SENS
CLOCK
XLAT
DATA
XRST
XTACN
SW3
SW1
SW7(CHACK)
SW8(OPEN)
SW2
SW6(CLOSE)
SW5(STOC)
OPTICAL PICK-UP
BLOCK
(KSM-213DCP/C2NP)
AUTOMATIC
POWER
CONTROL
Q321
+1.7V
+3.3V
LD
GND
FOCUS
COIL
F+
F
T+
T
SP+
SP
SL+
SL
TRACKING
COIL
IC402
S201
(LIMIT)
X201
16.9344MHz
+3.3V
SL/SP MOTOR
DRIVER
MOTOR
DRIVE
IC201
RF AMP,DSP,MP3
12
6
11
13
14
VR
PD
16
15
18
17
4
23
2
20
MUTE
CH2OUTF
CH1FIN
CH1RIN
CH2FIN
CH3FIN
OPIN+
CH2OUTR
CH1OUTR
CH1OUTF
CH4OUTF
CH4OUTR
CH3OUTR
CH3OUTF
M
M
M401
(SPINDLE)
M402
(SLED)
VCC
VC
A
B
C
D
E
F
DETECTOR
A
B
E
50
F
51
LD
66
PD
67
TFDR
43
SSTP
39
FFDR
45
SFDR
41
MPD
M-MUTE
38
XTACN
XRST
DATA
XLAT
CLOCK
117
AOUT2
112
AOUT1
108 XTAO
109 XTAI
57
58
C
59
D
60
SENS
XTACN
XRST
DATA
XLAT
CLOCK
SENS
13
XLAT-MP3
REQ-MP3 REQ-MP3
CD-L
CD-R
XLAT-MP3
TRDR
44
22
CH3RIN SRDR
42
CH2RIN FRDR
46
5
3.3V+1.8V
IC202
CD MECHANISM DECK
BLOCK
SYSTEM CONTROLLER
IC701
(1/2)
7
3 1
ACK-MP3 ACK-MP3
12
15
7
89
16
11
20
26
8
DATA2 DATA-MP3
90
CLK2 CLK-MP3
10
IREQ-MP3 IREQ-MP3
SCOR SCOR
+1.8
REG
43
10
49
5
6
50
12
11
28
27
22
26
20
25
19
18
29
30
8
31
3
34
21
14
FOCUS/TRUCKING
COIL DRIVER
MOTOR
DRIVE
M2
M
MOTOR
DRIVE
24
23 MOTOR
DRIVE
Q661-664
VM9V
CD
MOTOR
CONTROL
: CD
• Signal Path

1919
HCD-EC50
HCD-EC50
6-2. BLOCK DIAGRAM —TUNER SECTION —
: TUNER(FM)
: TUNER(AM)
• Signal Path
5
11
25
7
1
31
83
26
27
28
18
16
17
15
19 20
AM RF-IN
AM-OSC
36 FM RF-IN
34 FM RF-OUT
FM-OSC
32
FM/AM
ANTENNA
L851
D105 L852
AM OSC
L804
FM RF
D802
D803 L805
FM OSC
CF802
10.7MHz
EXCEPT US, CND
US, CND
CF801
L803
PD
LP-IN
LP-OUT
DO
DI
CL
CE
X801
75kHz
XIN XOUT
AM-MIX
FM-MIX
FM-DET
AGC
AM IF-IN
FM IF-IN
12
13
L-OUT
R-OUT
IC801
AM/FM IF AMP,
MIX, MPX, DET, OSC
FM/AM PLL
TU-DO
TU-DI
TU-CE
TU-CLK
TU-ANSD
MAIN
SECTION
(Page20)
B
TUNER
R-CH R-CH
TUNER
L-CH L-CH
CNP802
3
1
FM FREQUENCY
COVERAGE
AM FREQUENCY
COVERAGE
AM TRACKING
FM DETECTOR
FM TRACKING
CF803
450kHz
TU-DI
TU-CE
TU-DO
TU-ANSD
+9V
VM9V
VM9V+3V
+5V
TU-CLK
L806
Q801
Q802
+3V
REG
+5V
REG
Q803
R832
FM MIX
AMP
Ver. 1.2

2020
HCD-EC50
HCD-EC50
6-3. BLOCK DIAGRAM — MAIN SECTION —
: TUNER(FM)
: TUNER(AM)
: CD
• Signal Path
: AUX
: PB (TAPE)
: REC (TAPE)
• R-CH is omitted due to same as L-CH.
BIAS
OSC
Q507
REC/PB
HEAD
BLOCK
TAPE MECHANISM DECK
V2/P82
V1/P81
V0/P80
SYSTEM CONTROLLER
IC701(2/2)
P57/SI1
VOLUME
VOLUME
AUDIO IN
J105
FUCTION
KEY
REMOTE
CONTROL
RECEIVER
IC703
SW702-704, SW706,709,710,719,721
SW711-716, SW708,720
SW701,705
L-CH
R-CH R-CH
TU-DO
TU-DI
TU-CLK
TU-ANSD
TU-CE
R-CH
P63/AN3
39
55
56
57
33
L501
SW501(1/2)
(REC/PB)
(REC/PB)
SW501(2/2)
BIAS OSC
P64/AN4
40
X1A
14
X0A
13
X701
32.768kHz
X0
93
X1
92
X702
4.19MHz
9
P34/IC0
FUCTION
KEY
FUCTION
KEY
38
41
31
RESET
SWITCH
Q704
54
RSTX RESET
Q705,706
42
D051,052
RELAY
DRIVE
AC
IN
Q102 RY001
S001
37
P61/AN1
P62/AN2
P65/AN5/INT0
P71/AN9/SC1
P66/AN6/INT1
+9V
PB/REC EQ AMP
IC401
A1
19 18
OUT 1
B1
21
PB1P
2
C1
23
13
SD
28
REC 10
R-CH
R-CH
L-CH
P27
48
POWER
AMP
SEG0
SEG31
59
62
COM0
COM3
LIQUID CRYSTAL
DISPLAY
LCD702
Q244
Q135
Q201
Q243
Q242
Q241
Q131,133,
Q134,137
µCON +B
+3.6V
36
P60/ANO
P73/AN11/SI2
LINE
FILTER
VOLTAGE
SELECTOR
L001
+9V
VM9V
6
1
IC202
2
P25
5
D702
+9V
REG
IC101
+VP
-VP
1
3
D107-110
Q151-154
D111,113
+3.3V
REG
Q191
Q192
AVDD
( +3.3V)
DVDD
( +3.3V)
+3.3V
REG
D156
D154
Q193
EXCEPT US, CND
US,CND,AEP,UK,CET
DETECTION
+9V
POWER
MONITER
Q121,122
+3.6V
REG
Q701-703
1
P24
+3.6V
67
63
64
89
94
100
.
.
.
17
P40/LED0
46
SW700
LED702
LED
DRIVE
Q707
LED701
(BACK RIGHT)
(STANDBY)
J102
PHONES
R-CH
R-CH
L
R
R-CH
J101
SPEAKER
R-CH
CD-R
CD-L
A
BD/DRIVER
SECTION
(Page18)
P-SW
M-SW
+7V
PT001
POWER
(MAIN)
TRANSFORMER
PT002
POWER
(SUB)
TRANSFORMER
4
AMP
CONTROL
VOLTAGE
SHIFT
HP
MUTE
RELAY
CONTROL
OVERLOAD
AMP
PROTECT
THERMAL
DET
PROTECT
DET
DET
M
RY002
E3,SP
+9V FAN
CONTROL
Q901-Q903
M901
FAN MOTOR
M
E3,SP,KR,AUS
E3,SP,KR,AUS
TUNER
SECTION
(Page19)
B
RY131
TH241
Ver. 1.3
•Abbreviation
AUS:Australian model
CND : Canadian model
CET : East Europian and Russian models
E3 :240V AC area in E model
KR : Korean model
SP : Singapore model