Sony MZ-R70 Service Manual

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MZ-R70
SERVICE MANUAL
PORTABLE MINIDISC RECORDER
Model Name Using Similar Mechanism MZ-R90/R91
Mechanism Type MT-MZR70-165
Optical Pick-up Name LCX-2R
(Photo: Silver)
System
Audio playing system
MiniDisc digital audio system
Laser diode properties
Material: GaAlAs
Wavelength: λ = 790 nm
Emission duration: continuous
Laser output: less than 44.6 µW
(This output is the value measured at a
distance of 200 mm from the lens surface
on the optical pick-up block with 7 mm
aperture.)
Recording and playback time
Maximum 80 minutes (MDW-80, stereo
recording)
Maximum 160 minutes (MDW-80,
monaural recording)
Maximum 74 minutes (MDW-74, stereo
recording)
Maximum 148 minutes (MDW-74,
monaural recording)
Revolutions
400 rpm to 1,800 rpm (CLV)
Error correction
Advanced Cross Interleave Reed Solomon
Code (ACIRC)
Sampling frequency
44.1 kHz
Sampling rate converter
Input: 32 kHz/44.1 kHz/48 kHz
Coding
Adaptive TRansform Acoustic Coding
(ATRAC)
Modulation system
EFM (Eight to Fourteen Modulation)
Number of channels
2 stereo channels
1 monaural channel
SPECIFICATIONS
Frequency response
20 to 20,000 Hz ± 3 dB
Wow and Flutter
Below measurable limit
Inputs
Microphone: stereo mini-jack, 0.35–1.38
mV
Line in: stereo mini-jack, 69–194 mV
Optical (Digital) in: optical (digital) mini-
jack
Outputs
i1: stereo mini-jack, maximum output
level 5 mW + 5 mW, load impedance 16
ohm
i2: stereo mini-jack, maximum output
level 5 mW + 5 mW, load impedance 16
ohm
General
Power requirements
Sony AC Power Adaptor (supplied)
connected at the DC IN 3 V jack:
120 V AC, 60 Hz (US model)
230-240 V AC, 50/60 Hz (UK and Hong
Kong model)
240 V AC, 50/60 Hz (Australia and New
Zealand model)
220-230 V AC, 50/60 Hz (European
model)
220 V AC, 50 Hz (China model)
220 V AC, 50 Hz (Argentina model)
100-240 V AC, 50/60 Hz (Other models)
Nickel cadmium rechargeable battery
NC-WMAA (supplied)
LR6 (size AA) alkaline battery (not
supplied)
Battery operation time
Battery life
1)
Batteries Recording
2)
Playback
NC-WMAA Approx. Approx.
nickel cadmium 3 hours 6.5 hours
rechargeable
battery
LR6 (size AA) Approx. Approx.
Sony alkaline 3 hours
3)
17 hours
dry battery
1)
The battery life may be shorter due to
operating conditions and the temperature
of the location.
2)
When you record, use a fully charged
rechargeable battery.
3)
Recording time may differ according to
the alkaline batteries.
– Continued on next page –
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
Tourist Model
US and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
Ver 1.3 2001. 01
With SUPPLEMENT-1
(9-927-631-81)

Sony MZ-R70 Specifications

General

Brand	Sony
Model	MZ-R70
Category	CD Player
Language	English

Summary

Servicing Note

Optical Pick-Up Handling and Laser Safety

Crucial safety and handling instructions for the optical pick-up block and laser diode.

Laser Diode Emission Precautions

Warnings and precautions to prevent eye damage from laser diode emission.

General Information

Controls and Display Overview

Describes recorder buttons, switches, and display elements.

Disassembly Procedures

Bottom Block Assembly Disassembly

Step-by-step guide for disassembling the bottom block assembly.

Upper Panel Assembly Disassembly

Step-by-step guide for disassembling the upper panel assembly.

LCD Module Removal

Procedure for safely removing the LCD module.

Main Board Removal

Procedure for safely removing the main board.

MD Mechanism Deck Removal

Procedure for safely removing the MD mechanism deck.

Service Assy, OP Removal

Procedure for safely removing the OP service assembly.

Holder Assy Removal

Procedure for safely removing the holder assembly.

Motor Flexible Board Removal

Procedure for safely removing the motor flexible board.

DC Motor (M602) Removal

Procedure for removing the DC motor (M602).

DC Motors (M601, M603) Removal

Procedure for removing DC motors (M601) and (M603).

Test Mode Operations

Test Mode Entry and Operation

Overview of test mode, entry methods, and basic operation.

Test Mode Configuration and Navigation

How to navigate and switch between different modes within test mode.

Manual Mode Operations

Explains manual mode for adjusting or checking specific set functions.

Overall Adjustment Mode Execution

Guide for performing automatic servo adjustments on CD and MO discs.

Sound Skip Check Functionality

Using the sound skip check to diagnose record/playback errors.

Self-Diagnosis System Explained

Details self-diagnosis for error detection, history storage, and analysis.

Key Check Mode Functionality

Verifying operational status of set and remote commander keys.

Electrical Adjustments

Adjustment Precautions and Tools

Lists necessary tools and critical precautions before electrical adjustments.

Adjustment Sequence Overview

Outlines the mandatory order for performing electrical adjustments.

NV Reset Procedure

Step-by-step guide to perform a memory clear (NV reset).

Power Supply Manual Adjustment

Detailed steps for manually adjusting power supply parameters.

Temperature Correction Process

Instructions for adjusting parameters based on ambient temperature.

Overall Adjustment Mode Execution

Guide for running automated CD and MO overall adjustment.

Laser Power Adjustment and Check

Method for checking and adjusting laser power output levels.

Diagrams and Schematics

MD Section Block Diagram

Illustrates functional blocks of the MiniDisc signal processing section.

Audio Section Block Diagram

Illustrates functional blocks of the audio signal processing section.

Power Supply Section Block Diagram

Illustrates functional blocks of the power supply and control circuitry.

Main Board Printed Wiring Diagram

Shows layout of components and traces on the main board (Side A).

Main Board Schematic Diagrams

Provides detailed electrical schematics for the main board (Parts 1-3).

Integrated Circuit Block Diagrams

Visual representation of internal logic of key integrated circuits.

IC Pin Descriptions

Detailed explanation of function for each pin of major ICs.

Exploded Views

Cabinet Section Exploded View

Diagram showing breakdown of the recorder's cabinet components.

Mechanism Deck Exploded View

Diagram showing breakdown of the MD mechanism deck components.

Electrical Parts List