Sony HCD-EC68 / HCD-EC78 / MHC-EC68 / MHC-EC78 Service Manual ▷ View online
SERVICE MANUAL
Sony Corporation
Audio Business Group
Published by Sony Techno Create Corporation
section
HCD-EC78
European and Russian models:
Power output (rated):
Low channel
55 W + 55 W (at 8 Ω, 1 kHz, 1% THD)
High channel
55 W + 55 W (at 8 Ω, 8 kHz, 1% THD)
Low channel
55 W + 55 W (at 8 Ω, 1 kHz, 1% THD)
High channel
55 W + 55 W (at 8 Ω, 8 kHz, 1% THD)
RMS output power (reference):
Low channel
75 W + 75 W (per channel at 8 Ω, 1 kHz, 10% THD)
High channel
75 W + 75 W (per channel at 8 Ω, 8 kHz, 10% THD)
75 W + 75 W (per channel at 8 Ω, 1 kHz, 10% THD)
High channel
75 W + 75 W (per channel at 8 Ω, 8 kHz, 10% THD)
Other models:
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)
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)
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)
HCD-EC68
European and Russian models (except for the UK model):
Power output (rated):
50 W + 50 W (at 6 Ω, 1 kHz, 1% THD)
50 W + 50 W (at 6 Ω, 1 kHz, 1% THD)
RMS output power (reference):
70 W + 70 W (per channel at 6 Ω, 1 kHz, 10% THD)
Power output (rated):
55 W + 55 W (at 6 Ω, 1 kHz, 1% THD)
55 W + 55 W (at 6 Ω, 1 kHz, 1% THD)
RMS output power (reference):
75 W + 75 W (per channel at 6 Ω, 1 kHz, 10% THD)
Other models:
Power output (rated):
50 W + 50 W (at 6 Ω, 1 kHz, 1% THD)
50 W + 50 W (at 6 Ω, 1 kHz, 1% THD)
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
22 kilohms
Outputs
PHONES (stereo mini jack): Accepts headphones with an
impedance of 8 Ω or more
SPEAKER: impedance
HCD-EC78: 8 Ω
HCD-EC68: 6 Ω
impedance of 8 Ω or more
SPEAKER: impedance
HCD-EC78: 8 Ω
HCD-EC68: 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
Tape deck section (except for the UK model)
Recording system: 4-track 2-channel, stereo
Tuner section
FM stereo, FM/AM superheterodyne tuner
Antenna:
Antenna:
FM lead antenna
AM loop antenna
AM loop antenna
FM tuner section:
Tuning range:
87.5 – 108.0 MHz (50 kHz step)
Intermediate frequency: 10.7 MHz
87.5 – 108.0 MHz (50 kHz step)
Intermediate frequency: 10.7 MHz
AM tuner section:
Tuning range
Australian, Pan-American models:
530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,710 kHz (with 9 kHz tuning interval)
European and Russian models:
531 – 1,602 kHz (with 9 kHz tuning interval)
Other models:
530 – 1,610 kHz (with 10 kHz tuning interval)
531 – 1,602 kHz (with 9 kHz tuning interval)
Intermediate frequency: 450 kHz
Australian, Pan-American models:
530 – 1,710 kHz (with 10 kHz tuning interval)
531 – 1,710 kHz (with 9 kHz tuning interval)
European and Russian models:
531 – 1,602 kHz (with 9 kHz tuning interval)
Other models:
530 – 1,610 kHz (with 10 kHz tuning interval)
531 – 1,602 kHz (with 9 kHz tuning interval)
Intermediate frequency: 450 kHz
HCD-EC68/EC78
SPECIFICATIONS
EXCEPT HCD-EC68: UK MODEL
COMPACT DISC DECK RECEIVER
HCD-EC68: UK MODEL
COMPACT DISC RECEIVER
9-889-007-01
2008B05-1
©
2008.02
AEP Model
E Model
HCD-EC68/EC78
UK Model
Australian Model
HCD-EC68
Ver. 1.0 2008.02
• HCD-EC68 is the amplifi er, CD player, tape
deck (except UK model) and tuner section in
MHC-EC68.
MHC-EC68.
• HCD-EC78 is the amplifi er, CD player, tape
deck and tuner section in MHC-EC78.
Photo : HCD-EC78
CD
Section
Section
Model Name Using Similar Mechanism
NEW
Mechanism Type
CDM88A-K6BD90-WOD
Optical Pick-up Block Name
KSM-213DCP
Tape deck
Section
(EXCEPT EC68: UK)
Section
(EXCEPT EC68: UK)
Model Name Using Similar Mechanism
HCD-EC77
Tape Transport Mechanism Type
TCM-J1 or
CS-21SC-900TP
CS-21SC-900TP
– Continued on next page –
HCD-EC68/EC78
2
1.
SERVICING NOTES
............................................. 3
2. GENERAL
.................................................................. 6
3. DISASSEMBLY
3-1. Disassembly
Flow
........................................................... 8
3-2. Side
Panel
(L)/(R)
........................................................... 9
3-3. Top Panel (EC68: UK model)/Top Panel Block
(Except EC68: UK model) .............................................. 9
3-4. Tape Mechanism Deck (Except EC68: UK model) ........ 10
3-5. MAIN
3-5. MAIN
Board
................................................................... 10
3-6. Front Panel Section ......................................................... 11
3-7. Back Panel Block ............................................................ 11
3-8. CD
3-7. Back Panel Block ............................................................ 11
3-8. CD
Mechanism
Block
..................................................... 12
3-9. BU
Block
........................................................................ 12
3-10. OP Base Assy (KSM-213D) ........................................... 13
4.
TEST MODE
............................................................ 14
5. MECHANICAL
ADJUSTMENTS
...................... 18
6. ELECTRICAL
ADJUSTMENTS
........................ 18
7. DIAGRAMS
7-1. Printed Wiring Board - CD Board - ................................ 24
7-2. Schematic Diagram - CD Board - ................................... 25
7-3. Printed
7-2. Schematic Diagram - CD Board - ................................... 25
7-3. Printed
Wiring
Board
- DECK Board (Except EC68: UK model) - .................. 26
7-4. Schematic
Diagram
- DECK Board (Except EC68: UK model) - .................. 26
7-5. Printed Wiring Board - MAIN Board - ........................... 27
7-6. Schematic Diagram - MAIN Board (1/2) - ..................... 28
7-7. Schematic Diagram - MAIN Board (2/2) - ..................... 29
7-8. Printed Wiring Board - HI AMP Board (EC78) - ........... 30
7-9. Schematic Diagram - HI AMP Board (EC78) - .............. 30
7-10. Printed Wiring Board - LOW AMP Board - ................... 31
7-11. Schematic Diagram - LOW AMP Board - ...................... 31
7-12. Printed Wiring Board - PANEL Board (Suffi x-12) - ...... 32
7-13. Printed Wiring Board - PANEL Board (Suffi x-13) - ...... 32
7-14. Schematic Diagram - PANEL Board - ............................ 33
7-15. Printed Wiring Boards - KEY Section - .......................... 34
7-16. Schematic Diagram - KEY Section - .............................. 34
7-17. Printed Wiring Board - PT Board - ................................. 35
7-18. Schematic Diagram - PT Board - .................................... 36
7-6. Schematic Diagram - MAIN Board (1/2) - ..................... 28
7-7. Schematic Diagram - MAIN Board (2/2) - ..................... 29
7-8. Printed Wiring Board - HI AMP Board (EC78) - ........... 30
7-9. Schematic Diagram - HI AMP Board (EC78) - .............. 30
7-10. Printed Wiring Board - LOW AMP Board - ................... 31
7-11. Schematic Diagram - LOW AMP Board - ...................... 31
7-12. Printed Wiring Board - PANEL Board (Suffi x-12) - ...... 32
7-13. Printed Wiring Board - PANEL Board (Suffi x-13) - ...... 32
7-14. Schematic Diagram - PANEL Board - ............................ 33
7-15. Printed Wiring Boards - KEY Section - .......................... 34
7-16. Schematic Diagram - KEY Section - .............................. 34
7-17. Printed Wiring Board - PT Board - ................................. 35
7-18. Schematic Diagram - PT Board - .................................... 36
8.
EXPLODED VIEWS
8-1. Panel
Section
................................................................... 44
8-2. Tape Deck Section (Except EC68: UK).......................... 45
8-3. Front Panel Section ......................................................... 46
8-4. Chassis
8-3. Front Panel Section ......................................................... 46
8-4. Chassis
Section
............................................................... 47
8-5. Main
Section
................................................................... 48
8-6. CD Mechanism Section (CDM88A-K6BD90-WOD) .... 49
9.
ELECTRICAL PARTS LIST
.............................. 50
TABLE OF CONTENTS
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.
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.
General
Power requirements:
European and Russian models: AC 230 V, 50/60 Hz
Mexican model: AC 127 V, 60 Hz
Argentine model: AC 220 V, 50/60 Hz
Australian model: AC 230 – 240 V, 50/60 Hz
Other models: AC 120, 220 or 230 – 240 V, 50/60 Hz,
adjustable with voltage selector
Mexican model: AC 127 V, 60 Hz
Argentine model: AC 220 V, 50/60 Hz
Australian model: AC 230 – 240 V, 50/60 Hz
Other models: AC 120, 220 or 230 – 240 V, 50/60 Hz,
adjustable with voltage selector
Power consumption:
HCD-EC78
European and Russian models: 160 W
0.5 W (in Power Saving Mode)
Mexican model: 160 W
Other models: 150 W
Other models: 150 W
HCD-EC68
European and Russian models (except for the UK model): 100 W
0.5 W (in Power Saving Mode)
Other models: 100 W
Dimensions (w/h/d) (excl. speakers):
Approx. 200 × 306 × 415 mm
Mass (excl. speakers):
HCD-EC78
European and Russian models: Approx. 6.0 kg
Other models: Approx. 6.3 kg
Other models: Approx. 6.3 kg
HCD-EC68
European and Russian models (except for the UK model):
Other models: Approx. 5.3 kg
Approx. 5.3 kg
HCD-EC68/EC78
3
SECTION 1
SERVICING NOTES
Model
Part No.
EC68: AEP model
3-296-777-0[]
EC68: 120V AC area in E, Chilean and
Peruvian models
Peruvian models
3-296-779-0[]
EC78: AEP model
3-296-780-0[]
EC78: 120V AC area in E, Chilean and
Peruvian models
Peruvian models
3-296-782-0[]
EC68: Russian model
3-398-081-0[]
EC68: UK model
3-398-082-0[]
EC68: 240V AC area in E model
3-398-083-0[]
EC68: Australian model
3-398-084-0[]
EC68: Mexican model
3-398-085-0[]
EC68: Argentina model
3-398-086-0[]
EC78: Russian model
3-398-088-0[]
EC78: 240V AC area in E model
3-398-090-0[]
EC78: Mexican model
3-398-091-0[]
EC78: Argentina model
3-398-092-0[]
MODEL IDENTIFICATION
– Back Panel –
– Back Panel –
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.
MODEL
NUMBER
LABEL
NUMBER
LABEL
SUFFIX-12/SUFFIX-13 DISCRIMINATION OF PANEL
BOARD
BOARD
S301
– PANEL Board (Component Side) –
LCD301
S301
CN304
Suffix-12 : 1-875-490-12
Suffix-13 : 1-875-490-13
Suffix-13 : 1-875-490-13
HCD-EC68/EC78
4
HOW TO REMOVE THE KNOB (VOL)
HOW TO OPEN THE TRAY WHEN POWER SWITCH TURN OFF
door (CD)
Turn a gear by a driver
till a lever falls down
to the position of the figure.
lever
gear
pull the tray by the hand.
knob (VOL)
hole
Push the knob (VOL) by the flat head driver.
front panel block
(back view)
(back view)