Sony CX-LDB20 User Manual

SERVICE MANUAL
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
AEP Model
E Model
CX-LDB10/LDB20
Australian Model
CX-LDB10
MICRO HI-FI COMPONENT SYSTEM
9-879-549-01
2005C1678-1
© 2005.03
Ver. 1.0 2005.03
SPECIFICATIONS
CX-LDB10/LDB20
Model Name Using Similar Mechanism HCD-NE5
CD
Base Unit Name BU-K7BD81B
Section
Optical Pick-up Name KSM-213EDP/C2NP
Tape deck Model Name Using Similar Mechanism HCD-NE5
Section Tape Transport Mechanism Type CMAL5Z220A
CX-LDB10/LDB20 are the Amplifier, CD player,
Tape Deck and Tuner section in XR-DB10/DB20.
— Continued on next page —
Amplifier section
CX-LDB20
DIN power output (rated): 35 + 35 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
40 + 40 W
(6 ohms at 1 kHz, 10%
THD)
Music power output (reference):
62 + 62 W
Inputs
AUDIO IN: Sensitivity 700 mV,
impedance 47 kilohms
Outputs
PHONES: Accepts headphones with
an impedance of 8 ohms or
more
SPEAKER: Accepts impedance of 6 to
16 ohms.
CX-LDB10
DIN power output (rated): 20 + 20 W
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference):
22.5 + 22.5 W
(6 ohms at 1 kHz, 10%
THD)
Music power output (reference):
38 + 38 W
Inputs
AUDIO IN: Sensitivity 700 mV,
impedance 47 kilohms
Outputs
PHONES: Accepts headphones with
an impedance of 8 ohms or
more
SPEAKER: Accepts impedance of 6 to
16 ohms.
CD player section
Laser Diode Properties Emission duration:
continuous
Laser Output*: Less than
44.6 µW
*This output is the value measurement at a distance of
200 mm from the objective lens surface on the
Optical Pick-up Block with 7 mm aperture)
Frequency response 20 Hz – 20 kHz
Tape deck section
Recording system 4-track 2-channel, stereo
Frequency response 50 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassettes
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Pan-American model: 530 – 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 – 1,710 kHz
(with the tuning interval
set at 9 kHz)
European model: 531 – 1,602 kHz
(with the tuning interval
set at 9 kHz)
Other models: 530 – 1,710 kHz
(with the tuning interval
set at 10 kHz)
531 – 1,602 kHz
(with the tuning interval
set at 9 kHz)
Antenna AM loop antenna, external
antenna terminal
Intermediate frequency 450 kHz
Photo : CX-LDB20

Sony CX-LDB20 Specifications

General

Brand	Sony
Model	CX-LDB20
Category	Stereo System
Language	English

Summary

Service Manual Overview

Specifications

Technical details including power output, sensitivity, and frequency response.

General Precautions and Warnings

Handling Chip Components and Flexible PCBs

Guidelines for safe replacement and repair of sensitive electronic components.

Laser Safety and Component Warnings

Information on laser product safety and critical components for operational integrity.

Servicing Notes

Optical Pick-up Handling

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

Laser Diode Emission Check

Procedure for safely checking laser diode emission and focus search operation.

Disassembly Procedures

Disassembly Flow Chart

Overview of the sequence for disassembling the set into major components.

Internal Component Disassembly

Top Panel and Front Panel Assembly Removal

Procedure for removing the top panel and front panel assemblies.

Test Modes

Cold Reset Procedure

Resets the unit's RAM to initial conditions, clearing preset data.

Ship Reset Procedure

Panel Test Mode

Mechanical and Electrical Adjustments

Tape Mechanism Deck Section Precautions

Record/Playback Head Azimuth Adjustment

Procedure for adjusting the head azimuth for optimal playback quality.

Adjustment and Test Procedures

Playback Adjustment and Waveform Check

Tape Speed Check

CD Section Block Diagram

CD Section Signal Paths

Main Section Block Diagram

Main Section Signal Paths

CD Board Schematic Diagram

CD Board Circuit Connections

Detailed schematic showing the electrical connections on the CD board.

Main Board Schematic Diagram (1/3)

Main Board Circuit Connections (1/3)

Electrical schematic details for the first part of the main board.

Main Board Schematic Diagram (2/3)

Main Board Circuit Connections (2/3)

Electrical schematic details for the second part of the main board.

Main Board Schematic Diagram (3/3)

Main Board Circuit Connections (3/3)

Electrical schematic details for the third part of the main board.

Control Board Schematic Diagram

Control Board Circuit Connections

Detailed schematic showing the electrical connections on the control board.

Power Board Schematic Diagrams

Power Board Circuit Connections

Electrical schematics for the power supply boards.

IC Block Diagrams

CD Board IC Block Diagrams

Functional block diagram for the CD section's main IC (CXD3059AR).

Specific IC Block Diagrams

IC Block Diagrams (BA5947FM-E2, BH15FB1WG)

Block diagrams for IC251 and IC303, detailing their internal functions.

Main Board IC Block Diagram

Main Board IC Block Diagram (TC94A34FG-002)

Functional block diagram for the main IC on the main board.

Additional IC Block Diagrams

Main Board IC Block Diagrams (BD3881FV, PST3629NR)

Block diagrams for IC101 and IC403 on the main board.

Exploded Views

Overall Section Exploded View

Diagram showing the assembly of the entire unit with numbered parts.

Front Panel Assembly Exploded View

Chassis Section Exploded View

Top Panel Assembly Exploded View