Sony MZ-E30 Service Manual

NEW TECHNICAL THEORY FOR SERVICING

MZ-E30

OPERATION MANUAL

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PORTABLE MINI DISC PLAYER

TABLE OF CONTENTS

Section Title Page

1. DIAGRAMS

1-1. BLOCK DIAGRAM ........................................................................................................................................ 3

2. FUNCTIONS AND FEATURES

2-1. Principal Features ............................................................................................................................................. 6

3. Difference in System Configurations by Generation

3-1. System Block Diagrams................................................................................................................................... 8

4. OUTLINE OF SYSTEM

4-1. Microprocessor Interface ................................................................................................................................. 11

4-2. Clock System.................................................................................................................................................... 14

5. POWER SUPPLY CIRCUIT

5-1. Outline of Power supply Circuit Operation .................................................................................................... 16

5-2. Operation in Wakeup (Startup) Mode ............................................................................................................. 20

5-3. Operation in the Sleep (Pause) Mode .............................................................................................................. 24

5-4. Detecting Decrease in Voltage ........................................................................................................................ 24

5-5. RESET Circuit.................................................................................................................................................. 26

6. SYSTEM CONTROL

6-1. Detection Switch .................................................................................................................................................. 27

6-2. Key Input Detection of Control Buttons ......................................................................................................... 28

6-3. Control of APC Circuit and Laser Power ....................................................................................................... 30

7. Playback Circuit

7-1. Outline of Playback Circuit ............................................................................................................................. 32

7-2. Playback Operations......................................................................................................................................... 32

7-3. Digital DBB and Mute Circuit ........................................................................................................................ 33

8. Servo Circuit

8-1. Outline of Servo Circuit ................................................................................................................................... 39

8-2. Intermittent Operations of Servo ........................................................................................... .......................... 40

8-3. Focus Search and Disc Discrimination ........................................................................................................... 40

8-4. Focus Servo Circuit.......................................................................................................................................... 42

8-5. Tracking Servo Circuit..................................................................................................................................... 46

8-6. Sled Servo Circuit ............................................................................................................................................ 46

8-7. Spindle Servo Circuit ....................................................................................................................................... 50

9. Operations of Mechanism ............................................................................................ 53

10. Appendix (Semiconductor Specifications)

10-1. RF AMP SN761050A ...................................................................................................................................... 54

10-2. DSP/Digital Servo µPD63730GC.................................................................................................................... 58

10-3. Servo Driver MPC17A55FTA ......................................................................................................................... 63

10-4. DC-DC Converter MPC1830VMEL ............................................................................................................... 71

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3. DIFFERENCE IN SYSTEM CONFIGURATIONS BY GENERATION

For a Mini Disc of playback type, each system is composed of such principal LSIs as shown in Table 3-1.. The difference

between the first and second generations lies in the L/Rch, two pieces of which have been employed in the ATRAC decoder of the first generation and are intensified into a single LSI in the second generation. The third generation, moreover, has had the principal LSIs intensified into three pieces except for the servo driver as shown in the table.

In the fourth generation, on the other hand, has been far larger sized and more highly integrated. As a result, the principal circuit of a Mini Disc has been intensified into a single LSI while six LSIs, including the ATRAC decoder, were employed in the first generation. In the case of a playback type model heretofore available, a playback circuit and a decoder circuit have been employed while jointly using the principal LSI with a recorder/playback unit. The MZ-E30, however, employs an newly developed LSI for the exclusive use of playback, which has especially main functions, such as shock-proof, ATRAC decoding, EFM decoding and ACIRC decoding.

The principal LSI in the fourth generation are outlined below.

µPD63730GC : DSSP (digital servo): EFM decoder, ACIR decoder, DRAM controller, ADIP decoder, and clock generator

circuit

MPC17A55FTA : Servo drive circuit, and step up/down power supply circuit SN761050A : RF amplifier, and I-V amplifier with a gain adjustment switch

Table 3-1. Principal LSIs Employed in a Mini Disc for Playback

Applicable Model

Circuit Block

ATRAC Decoder

Shock-proof Memory Controller

EFM ACRIC Decoder

ADIP Demodulator

Servo Signal Processor

Servo Driver

RF Amplifier

1st Generation

MZ-2P

CXD2527R(2)

CXD2526Q CXD2525R CXA1380N CXA1602R

MPC1718PU

CXA1381R

2nd Generation

MZ-E2

CXD2531AR CXD2526AR

CXD2525R CXA1380N CXA1602R

MPC1718PU

CXA1861R

3rd Generation

MZ-E3

MZ-E40

CXD2536R

CXD2535BR

MPC17A38VM

CXA1981AR

4th Generation

MZ-E30

µPD63730GC

MPC17A55FTA

SN761050A

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3-1. System Block Diagrams

The playback type Mini Discs belonging to the first thru 4th generations have their respective systems composed of the

blocks illustrated below.

(1) 1st Generation [MZ-2P]

4M DRAM

OPTICAL BLOCK

KMS-130

DRIVE

MPC1718

Fig. 3-1. First Generation Mini Disc System Block Diagram

(2) 2nd Generation [MZ-E2]

ADIP

CXA1380

RF AMP.

CXA1381

SERVO

CXA1602

EFM

ACIRC

CXD2525

SYSTEM CONTROLLER

CXD2526

4M DRAM

SHOCK PROOF

ATRAC(L)

CXD2527

ATRAC(R)

CXD2527

D/A CONV.

AK4501

AUDIO

OUTPUT