Sony HCD-EC68P / HCD-EC78P / MHC-EC68PI / MHC-EC78PI Service Manual ▷ View online
SERVICE MANUAL
Sony Corporation
Audio&Video Business Group
Published by Sony Techno Create Corporation
HCD-EC68P/EC78P
SPECIFICATIONS
COMPACT DISC RECEIVER
9-889-053-02
2009A05-1
©
2009.01
US Model
HCD-EC68P/EC78P
Canadian Model
UK Model
HCD-EC78P
Australian Model
HCD-EC68P
Ver. 1.1 2009.01
• HCD-EC68P is the amplifi er, CD player and
tuner section in MHC-EC68Pi.
• HCD-EC78P is the amplifi er, CD player and
tuner section in MHC-EC78Pi.
Photo : HCD-EC78P
Model Name Using Similar Mechanism
CDM77B-K6BD90-WOD
NEW
CDM88A-K6BD90-WOD
HCD-EC68
Mechanism Type
Except EC78P (UK)
CDM77B-K6BD90-WOD
EC78P (UK)
CDM88A-K6BD90-WOD
Base Unit Name
BU-K6BD90-WOD
Optical Pick-up Block Name
KSM-213DCP
Main unit
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
Low channel
With 8 ohm loads, both channels driven, from 120 – 10,000 Hz;
60 watts per channel minimum RMS power, with no more than
0.7% total harmonic distortion from 250 milliwatts to rated output.
High channel
With 8 ohm loads, both channels driven, from 2,000 – 13,000 Hz;
60 watts per channel minimum RMS power, with no more than
0.7% total harmonic distortion from 250 milliwatts to rated output.
With 8 ohm loads, both channels driven, from 120 – 10,000 Hz;
60 watts per channel minimum RMS power, with no more than
0.7% total harmonic distortion from 250 milliwatts to rated output.
High channel
With 8 ohm loads, both channels driven, from 2,000 – 13,000 Hz;
60 watts per channel minimum RMS power, with no more than
0.7% total harmonic distortion from 250 milliwatts to rated output.
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
With 6 ohm loads, both channels driven, from 120 – 10,000 Hz;
40 watts per channel minimum RMS power, with no more than
0.7% total harmonic distortion from 250 milliwatts to rated output.
40 watts per channel minimum RMS power, with no more than
0.7% total harmonic distortion from 250 milliwatts to rated output.
section
HCD-EC78P: US and Canadian models
RMS output power (reference):
Low channel
95 W + 95 W (per channel at 8 Ω, 1 kHz, 10% THD)
High channel
95 W + 95 W (per channel at 8 Ω, 8 kHz, 10% THD)
95 W + 95 W (per channel at 8 Ω, 1 kHz, 10% THD)
High channel
95 W + 95 W (per channel at 8 Ω, 8 kHz, 10% THD)
HCD-EC68P
RMS output power (reference):
70 W + 70 W (per channel at 6 Ω, 1 kHz, 10% THD)
Inputs
AUDIO IN (stereo mini jack):
Sensitivity 800 mV, impedance 22 kilohms
Sensitivity 800 mV, impedance 22 kilohms
Outputs
PHONES (stereo mini jack):
Accepts headphones with an impedance of 8 Ω or more
SPEAKER: impedance
HCD-EC78P: 8 Ω
HCD-EC68P: 6 Ω
Accepts headphones with an impedance of 8 Ω or more
SPEAKER: impedance
HCD-EC78P: 8 Ω
HCD-EC68P: 6 Ω
CD player section
System: Compact disc and digital audio system
Laser: Semiconductor laser (
λ
=770 – 810 nm)
Emission duration: continuous
Frequency response: 20 Hz – 20 kHz
Signal-to-noise ratio: More than 90 dB
Dynamic range: More than 88 dB
Frequency response: 20 Hz – 20 kHz
Signal-to-noise ratio: More than 90 dB
Dynamic range: More than 88 dB
Tuner section
FM stereo, FM/AM superheterodyne tuner
Antenna:
Antenna:
FM lead antenna
AM loop antenna
AM loop antenna
FM tuner section:
Tuning range
North American model: 87.5 – 108.0 MHz (100 kHz step)
UK and Australian models: 87.5 – 108.0 MHz (50 kHz step)
Intermediate frequency: 10.7 MHz
North American model: 87.5 – 108.0 MHz (100 kHz step)
UK and Australian models: 87.5 – 108.0 MHz (50 kHz step)
Intermediate frequency: 10.7 MHz
AM tuner section:
Tuning range
North American model:
530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,710 kHz (with 9 kHz tuning interval)
Australian model:
North American model:
530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,710 kHz (with 9 kHz tuning interval)
Australian model:
UK model:
531 – 1,710 kHz (with 9 kHz tuning interval)
530 – 1,710 kHz (with 10 kHz tuning interval)
Intermediate frequency: 450 kHz
530 – 1,710 kHz (with 10 kHz tuning interval)
Intermediate frequency: 450 kHz
General
Power requirements:
North American model: AC 120 V, 60 Hz
UK model: AC 230 V, 50/60 Hz
UK model: 160 W
Australian model: AC 230 – 240 V, 50/60 Hz
Power consumption:
HCD-EC78P
USA model: 210 W
Canadian model: 270 VA
Canadian model: 270 VA
HCD-EC68P
110 W
Dimensions (w/h/d) (excl. speakers):
Approx. 200 × 306 × 415 mm
Mass (excl. speakers):
HCD-EC78P: US and Canadian models
Approx. 5.8 kg
HCD-EC68P
Approx. 4.7 kg
HCD-EC78P: UK model
Power output (rated):
Low channel
50 W + 50 W (at 8 Ω, 1 kHz, 1% THD)
High channel
50 W + 50 W (at 8 Ω, 8 kHz, 1% THD)
50 W + 50 W (at 8 Ω, 1 kHz, 1% THD)
High channel
50 W + 50 W (at 8 Ω, 8 kHz, 1% THD)
RMS output power (reference):
Low channel
70 W + 70 W (per channel at 8 Ω, 1 kHz, 10% THD)
High channel
70 W + 70 W (per channel at 8 Ω, 8 kHz, 10% THD)
70 W + 70 W (per channel at 8 Ω, 1 kHz, 10% THD)
High channel
70 W + 70 W (per channel at 8 Ω, 8 kHz, 10% THD)
531 – 1,602 kHz (with 9 kHz tuning interval)
Intermediate frequency: 450 kHz
Intermediate frequency: 450 kHz
0.5 W (in Power Saving Mode)
HCD-EC78P: UK model
Approx. 6.1 kg
(HCD-EC78P The United States model only)
(HCD-EC68P The United States model only)
HCD-EC68P/EC78P
2
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.
aged by heat.
Flexible Circuit Board Repairing
•
•
Keep the temperature of soldering iron around 270 °C during
repairing.
repairing.
•
Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
circuit board (within 3 times).
•
Be careful not to apply force on the conductor when soldering
or unsoldering.
or unsoldering.
This appliance is
classified as a CLASS 1
LASER product. This
marking is located on the
rear exterior.
classified as a CLASS 1
LASER product. This
marking is located on the
rear exterior.
CAUTION
Use of controls or adjustments or performance of procedures other than
those specifi ed herein may result in hazardous radiation exposure.
Use of controls or adjustments or performance of procedures other than
those specifi ed herein may result in hazardous radiation exposure.
SAFETY-RELATED COMPONET 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
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 PUBLISHED BY SONY.
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
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 FONC-
TIONNEMENT. NE REMPLACER CES COM- POSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC-
TIONNEMENT. NE REMPLACER CES COM- POSANTS QUE
PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON-
NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
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.
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
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.
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 passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)
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 passive 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
Ω
0.15
μF
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
HCD-EC68P/EC78P
3
1.
SERVICING NOTES
............................................. 3
2. GENERAL
.................................................................. 6
3. DISASSEMBLY
3-1. Disassembly
Flow
........................................................... 10
3-2. Side Panel (L)/(R) ........................................................... 11
3-3. Panel
3-3. Panel
(Top)
...................................................................... 11
3-4. MAIN
Board
................................................................... 12
3-5. Front Panel Block (EC78P: UK) .................................... 12
3-6. Front Panel Block (EC68P/EC78P: US, Canadian) ........ 13
3-7. Back Panel Block ............................................................ 13
3-8. 3 CD Mechanism Block (EC78P: UK) ........................... 14
3-9. Base Unit (EC78P: UK) .................................................. 14
3-10. 1 CD Mechanism Block
3-6. Front Panel Block (EC68P/EC78P: US, Canadian) ........ 13
3-7. Back Panel Block ............................................................ 13
3-8. 3 CD Mechanism Block (EC78P: UK) ........................... 14
3-9. Base Unit (EC78P: UK) .................................................. 14
3-10. 1 CD Mechanism Block
(EC68P/EC78P: US, Canadian) ...................................... 15
3-11. Base Unit (EC68P/EC78P: US, Canadian) ..................... 15
3-12. Belt (EC68P/EC78P: US, Canadian) .............................. 16
3-13. Belt (EC78P: UK) ........................................................... 16
3-14. OP Base Assy (KSM-213D) ........................................... 17
3-12. Belt (EC68P/EC78P: US, Canadian) .............................. 16
3-13. Belt (EC78P: UK) ........................................................... 16
3-14. OP Base Assy (KSM-213D) ........................................... 17
4.
TEST MODE
............................................................ 18
5. ELECTRICAL
ADJUSTMENTS
........................ 22
6. DIAGRAMS
6-1. Block Diagram - CD SERVO, TUNER Section - ........... 25
6-2. Block Diagram - MAIN Section - ................................... 26
6-3. Printed Wiring Board - CD Board - ................................ 28
6-4. Schematic Diagram - CD Board - ................................... 29
6-5. Printed Wiring Boards - MAIN Section - ....................... 30
6-6. Schematic Diagram - MAIN Section (1/3) - ................... 31
6-7. Schematic Diagram - MAIN Section (2/3) - ................... 32
6-8. Schematic Diagram - MAIN Section (3/3) - ................... 33
6-9. Printed Wiring Board - HI AMP Board (EC78P) - ......... 34
6-10. Schematic Diagram - HI AMP Board (EC78P) - ............ 34
6-11. Printed Wiring Board - LOW AMP Board - ................... 35
6-12. Schematic Diagram - LOW AMP Board - ...................... 35
6-13. Printed Wiring Board - PANEL Board - ......................... 36
6-14. Schematic Diagram - PANEL Board - ............................ 37
6-15. Printed Wiring Boards - KEY Section - .......................... 38
6-16. Schematic Diagram - KEY Section - .............................. 38
6-17. Printed Wiring Board - MOTOR Board
6-2. Block Diagram - MAIN Section - ................................... 26
6-3. Printed Wiring Board - CD Board - ................................ 28
6-4. Schematic Diagram - CD Board - ................................... 29
6-5. Printed Wiring Boards - MAIN Section - ....................... 30
6-6. Schematic Diagram - MAIN Section (1/3) - ................... 31
6-7. Schematic Diagram - MAIN Section (2/3) - ................... 32
6-8. Schematic Diagram - MAIN Section (3/3) - ................... 33
6-9. Printed Wiring Board - HI AMP Board (EC78P) - ......... 34
6-10. Schematic Diagram - HI AMP Board (EC78P) - ............ 34
6-11. Printed Wiring Board - LOW AMP Board - ................... 35
6-12. Schematic Diagram - LOW AMP Board - ...................... 35
6-13. Printed Wiring Board - PANEL Board - ......................... 36
6-14. Schematic Diagram - PANEL Board - ............................ 37
6-15. Printed Wiring Boards - KEY Section - .......................... 38
6-16. Schematic Diagram - KEY Section - .............................. 38
6-17. Printed Wiring Board - MOTOR Board
(EC68P/EC78P: US, Canadian models) - ....................... 39
6-18. Schematic Diagram - MOTOR Board
(EC68P/EC78P: US, Canadian models) - ....................... 39
6-19. Printed Wiring Board - PT Board - ................................. 40
6-20. Schematic Diagram - PT Board - .................................... 41
6-20. Schematic Diagram - PT Board - .................................... 41
7.
EXPLODED VIEWS
7-1. Panel
Section
................................................................... 47
7-2. Front Panel Section ......................................................... 48
7-3. Chassis
7-3. Chassis
Section
............................................................... 49
7-4. Main
Section
................................................................... 50
7-5. 3 CD Mechanism Section (EC78P: UK)
(CDM88A-K6BD90-WOD)
(CDM88A-K6BD90-WOD)
...........................................
51
7-6. 1 CD Mechanism Section (Except EC78P: UK)
(CDM77B-K6BD90-WOD)
(CDM77B-K6BD90-WOD)
...........................................
52
8.
ELECTRICAL PARTS LIST
.............................. 53
TABLE OF CONTENTS
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostat-
ic 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 fl exible board is easily damaged and should be handled with
care.
ic 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 fl exible 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 refl ective surface by the objective lens in the optical
pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
The laser beam on this model is concentrated so as to be focused
on the disc refl ective surface by the objective lens in the optical
pickup block. Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
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
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
• 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.
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
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 fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
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.
also be added to ordinary solder.
RELEASING THE DISC TRAY LOCK
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
The disc tray lock function for the antitheft of an demonstration
disc in the store is equipped.
Releasing Procedure:
1. Press
1. Press
[I/
1
] button to turn the power on.
2. Press the [FUNCTION] button to select CD function.
3. While pressing the [
3. While pressing the [
x
] button, press the [
Z
] button for more 5
seconds).
4. The message “UNLOCKED” is displayed and the disc tray is
unlocked.
Note: When
“
LOCKED
”
is displayed, the slot lock is not released by
turning power on/off with the
[I/1]
button.
HCD-EC68P/EC78P
4
HOW TO REMOVE THE KNOB (VOL)
HOW TO OPEN THE TRAY WHEN POWER SWITCH TURN OFF
Turn a gear by a driver
till a lever falls down
to the position of the figure.
lever
gear
(EC78P: UK)
(EXCEPT EC78P: UK)
Pull the tray by the hand.
Slide the boss by a driver.
boss
knob (VOL)
hole
Push the knob (VOL) by the flat head driver.
front panel block
(back view)
(back view)