Sony HCD-EC78P User Manual

SERVICE MANUAL
Sony Corporation
Audio Business Group
Published by Sony Techno Create Corporation
HCD-EC68P/EC78P
SPECIFICATIONS
COMPACT DISC RECEIVER
9-889-053-01
2008C05-1
©
2008.03
US Model
HCD-EC68P/EC78P
Canadian Model
UK Model
HCD-EC78P
Australian Model
HCD-EC68P
Ver. 1.0 2008.03
• 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:
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.
AUDIO POWER SPECIFICATIONS
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.
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)
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
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
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
Tuner section
FM stereo, FM/AM superheterodyne tuner
Antenna:
FM lead 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
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:
UK model:
531 – 1,710 kHz (with 9 kHz tuning interval)
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
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)
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)
531 – 1,602 kHz (with 9 kHz tuning interval)
Intermediate frequency: 450 kHz
0.5 W (in Power Saving Mode)
HCD-EC78P: UK model
Approx. 6.1 kg
(HCD-EC78P e United States model only)
(HCD-EC68P e United States model only)

Sony HCD-EC78P Specifications

General

Brand	Sony
Model	HCD-EC78P
Category	Car Receiver
Language	English

Summary

Servicing Notes

Handling Optical Pick-up Block or Base Unit

Precautions for handling the optical pick-up block to prevent electrostatic discharge.

Laser Diode Emission Check Safety

Guidelines for safely checking laser diode emission from the optical pickup block.

Unleaded Solder Characteristics

Information on the properties and use of unleaded solder for circuit board repair.

Releasing Disc Tray Lock

Procedure to release the disc tray lock, often used for anti-theft.

Disassembly Procedures

Disassembly Flow

A flowchart outlining the sequential steps for disassembling the unit.

Side Panel Removal

Instructions for removing the left and right side panels.

Main Board Access

Steps for accessing and removing the main circuit board.

CD Mechanism Disassembly

Instructions for disassembling the 3 CD mechanism block for the EC78P UK model.

Test Modes

Cold Reset Procedure

How to perform a cold reset to restore factory default settings.

Panel Test Mode

Procedure to activate a test mode displaying all LEDs and display segments.

CD Servo Test Mode

Mode to check and adjust the servo system of the optical pickup.

CD Service Mode

Mode for controlling the optical pickup sled and laser power.

Electrical Adjustments

Focus Bias Check

Procedure for checking the optical pick-up's focus bias using an oscilloscope.

FM Detector Adjustment

Steps for adjusting the FM detector circuit for optimal performance.

Diagrams

Block Diagram - CD Servo, Tuner Section

Block diagram illustrating the CD servo and tuner system.

Block Diagram - Main Section

Block diagram showing the main functional blocks of the audio system.

Schematic Diagram - CD Board

Detailed schematic diagram for the CD board circuitry.

Schematic Diagram - Main Section (1/3)

First part of the schematic diagram for the main section.

Exploded Views

Panel Section Exploded View

Exploded view showing the assembly of the front panel components.

Front Panel Section Exploded View

Detailed exploded view of the front panel parts and their assembly.

Chassis Section Exploded View

Exploded view illustrating the chassis assembly and related parts.

Electrical Parts List

CD Section Parts

List of components for the CD section, including capacitors, coils, and resistors.

Low Amp and Main Board Parts

Parts list for Low Amp and Main boards, including resistors and capacitors.

Main Board Parts (Continued)

Continued list of Main board components: capacitors, ICs, transistors.

Panel, PT, and Reg Board Parts

Parts list for Panel, PT, and Reg boards: capacitors, ICs, transistors.