Sony MZ-E55 Service Manual

MZ-E55

SERVICE MANUAL

Ver 1.0 1998.10

US and foreign patents licensed from Dolby Laboratories Licensing Corporation

SPECIFICATIONS

MD Section

Audio playing system

Minidisc digital audio system

Laser diode properties

Material : GaAlAs Wavelength : λ =790nm Emission duration : continuous

Laser output : less than 44.6 µW* * This output is the value measured at a distance of 200 mm from the

objective lens surface on the optical pick-up block with 7mm aperture.

Revolutions

400 rpm to 900 rpm (CLV)

Error correction

Advanced Cross Interleave Reed Solomon Code (ACIRC)

Sampling frequency

44.1kHz

Coding

Adaptive Transform Acoustic Coding (ATRAC)

Modulation system

EFM (Eight to Fourteen Modulation)

Number of channels

2 stereo channels 1 monaural channel

Frequency response

20 to 20,000 Hz ± 3 dB

Wow and Flutter

Below measurable limit

Outputs

Headphones : stereo mini-jack, maximum output level 5mW+5mW, load impedance 16 ohm

E Model

Tourist Model

Model Name Using Similar Mechanism NEW MD Mechanism Type MT-MZE55-150 Optical Pick-up Mechanism Type ODX-1A/1B

General

Power requirements

Rechageable battery (supplied) Nickel metal hydride rechargeable battery NH-9WM (N) One LR6 (size AA) alkaline battery (not supplied) Sony AC Power Adaptor (not supplied) connected at the DC IN

1.5V jack

Battery operation time

Batteries Playback Nickel metal hydride Approx. Rechargeable battery (NH-9WM (N)) 7.5 hours One LR6 (size AA) Approx. Sony alkaline dry batteries 10 hours Nickel metal hydride (NH-9WM (N)) + Approx. One LR6 (size AA) 20 hours

Dimensions

Approx. 79.7 x 14.9 x 71.9 mm (w/h/d) (3 1/4 x 19/32 x 2 7/8 in) not including projecting parts and controls

Mass

Approx. 80 g (2.9 oz.) the player only Approx. 120 g (4.3 oz.) incl. a premastered MD and a nickel metal hydride rechargeable battery NH-9WM (N)

Supplied accessories

Battery charger (1) Rechargeable battery (1) Rechargeable battery carrying case (1) Headphones with a remote control (1) Dry battery case (1) Carrying pouch (1) Plug adaptor (1) (Tourist model)

MICROFILM

Design and specifications are subject to change without notice.

PORTABLE MINIDISC PLAYER

TABLE OF CONTENTS

Specifications ............................................................................ 1

1. SERVICING NOTE...................................................... 2

2. GENERAL

Location and Function of Controls .................................... 3

3. DISASSEMBLY

3-1. Upper Panel Assy ....................................................... 4

3-2. Mechanism Deck Section ........................................... 4

3-3. Main board, Audio board............................................ 5

3-4. Switch board ............................................................... 5

3-5. Optial Pick-up Block Assy ......................................... 6

4. TEST MODE................................................................... 7

This Mini Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the bottom exterior.

IN NO EVENT SHALL SELLER BE LIABLE FOR ANY DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY NATURE, OR LOSSES OR EXPENSES RESULTING FROM ANY DEFECTIVE PRODUCT OR THE USE OF ANY PRODUCT.

“MD WALKMAN” is a trademark of Sony Corporation.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

5. ELECTRICAL ADJUSTMENTS............................ 11

6. DIAGRAMS

6-1. Explanation of IC Terminals..................................... 13

6-2. Block Diagram.......................................................... 15

6-3. Printed Wiring Boards .............................................. 18

6-4. Schematic Diagram................................................... 21

7. EXPLODED VIEWS

7-1. Main Section............................................................. 29

7-2. Mechanism Deck Section ......................................... 30

8. ELECTRICAL PARTS LIST ................................ 31

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270°C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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.

SECTION 1

SERVICING NOTE

When repairing this device with the power on, if you remove the main board, this device stops working. In this case, you work without the device stopping by fastening the hook of the Open/Close detection switch (S801).

Mechanism deck section

Open/Close detection switch (S801)

– 2 –

LOCATION AND FUNCTION OF CONTROLS

Main Unit

SECTION 2

GENERAL

1 OPERA TE lamp 2 HOLD switch 3 DIGIT AL MEGA BASS s witc h 4 AVLS s witc h 5 Battery compartment 6 V OLUME +/– b uttons

Headphones with Remote Control

56 8

!º

7 MD operate b uttons

+ ” ( FF • PLA Y ) = (REW ) p (STOP)

8 External battery terminal (+/–) 9 OPEN knob !º 2 / REMOTE jac k

1 Headphones 2 MD operate switch and buttons

” • + (PLAY • FF) = (REW) p (STOP)

3 VOL +/– button 4 Displa y windo w 5 DISPLAY button 6 PLAYMODE button 7 P (PAUSE) b utton 8 HOLD c switch 9 p (STOP) b utton

– 3 –

SECTION 3

DISASSEMBLY

The equipment can be removed using the following procedure.

set

Note : Follow the disassembly procedure in the numerical order given.

3-1. UPPER PANEL ASSY

Upper panel ASSY

Screws (M1.4) precision pan

Mechanism deck section

Main board, Audio board Switch board

Optical pick-up block ASSY

Upper panel ASSY

Lid, Battery case

3-2. MECHANISM DECK SECTION

CLV flexible board

Main unit

Screw (M1.4) step

Screws (M1.4) precision pan

OPEN knob

Mechanism deck section

Flexible

board

Slider ASSY, Open

Main board

Main unit

– 4 –

3-3. MAIN BOARD, AUDIO BOARD

Audio board

Claw

Lid, Battery case

Screws (M1.4) step

* NOTE : When removing the audio board, lift up on the board so that the connector separates vertically.

3-4. SWITCH BOARD

Case, Battery

Main board

Panel, Buttom

Terminal (plus) ASSY, Battery

Screws (M1.4) precision pa

Plate (R) ASSY, Fulcrum

Screw

Case, Battery

Switch board

Main board

Switch flexible board

Label, Caution

* NOTE :

The caution label (4-213-092-01) affixed to the switch-flexible board will be damaged or deformed when the switch board or the switch-flexible board is removed so replace it with a new caution label.

– 5 –

3-5. OPTICAL PICK-UP BLOCK ASSY

Flexible board

Double sided adhesive tape

Optical pick-up block ASSY

Screw (M1.4) precision pan

Shaft (Main)

Flexible board

Chassis ASSY

– 6 –

SECTION 4

” key

p key

VOL + key

VOL – key

(Start ?)

Overall adjustment mode (Auto?)

Adjustment mode (Manu ?)

Servo mode

0 0 0

Audio mode

1 0 0

Power mode

3 0 0

+, – keys

Display when test mode

is set

Displays of the LCD on the remote commander are shown in parentheses.

Test mode

Short : Test mode Open : Normal mode

TAP801

TEST MODE

Outline

• In this set, overall adjustment mode is made available by entering test mode to perform automatic adjustment of CD and MO. In the overall adjustment mode, the disc is determined whether it is CD or MO and adjustments are performed in sequence. If a fault is found, the location of the fault is displayed. Also, in servo mode, each adjustment can be automatically made.

• Operation in the test mode is performed with the Remote Commander. A key having no particular description in the text, indicates a Remote Commander key.

Setting the Test Mode

T o enter the test mode, two methods are available :

1. Entering method with key input. Turn on the HOLD switch on the set. While holding down the p key on the set, press the following remote commander keys in the following order :

+ n + n = n = n + n = n + n = n P n P

2. Entering method by shorting the test point Solder bridge the test point TAP801 (TEST) on the main board (connect IC801 pin #™ to GND), and turn on the POWER.

[MAIN BOARD] (Conductor side)

Configuration of Test Mode

The test mode has the configuration given below.

Servo Mode

• Set the test mode, press the VOLUME – key and use the ” key to set the servo mode.

• When the servo mode is set, use the + key and the = key to move the optical pick-up to the outer circumference and to the inner circumference respectively.

• When entering another mode, refer to the configuration of test mode.

1. Structure of Servo Mode

Releasing the Test Mode

1. When test mode was entered with key input, turn off the POWER.

2. When test mode was entered by shorting the test point, turn off the POWER and open the solder bridge of TAP801 (TEST MODE) on the main board.

Operation of Setting on Test Mode

When the test mode is set, the LCD displays the following :

LCD on remote commander

• The cycle - the above ROM version display n All lit n All off

- is repeated. (The ROM version is constantly displayed.)

• When the PLAY MODE key is pressed and hold down, the display at that time is held so that display can be checked.

V2. 000

ROM version display

Servo mode

0 0 0

p key

” key

Offset adjustment

0 1 0

+, – keys+, – keys

Laser power

adjustment

(See page 8.)

” key

p key

” key

0 2 0

p key

*1 Repeatedly press ” key

to change the mode. (Refer to the following list for a description of each mode.)

011 to 013

” key

021 to 024

” key

– 7 –

(See page 7.)

p key

MO adjustment

0 3 0

p key

+, – keys

Low reflection

CD adjustment

0 4 0

p key

+, – keys

CD adjustment

0 5 0

p key

+, – keys

” key

031 to 039

” key

041 to 048

” key

051 to 058

” key

2. Description of Each Mode 010 Offset adjustment

Mode Description

011 FE offset 012 TE offset 013 All servo ON

020 Laser power adjustment

Mode Description

021 MO power A 022 MO power E 023 CDL power 024 CD power

030 MO adjustment

Mode Description

031 MO EF balance 032 MO EF gain 033 MO ABCD gain 034 MO focus gain 035 MO tracking gain 036 MO RF gain 037 MO ADIP gain 038 MO focus bias E 039 CD focus bias A

p key

Sled movement

0 6 0

p key

+, – keys

Automatic

adjustment

0 7 0

p key

+, – keys

NV relation

0 9 0

p key

+, – keys

Retern the Offset adjustment (0 1 0)

” key

061 , 062

” key

071, 072,

073, 074

” key

091, 092,

093

” key

*1 : Repeatedly press ” key

to change the mode. (Refer to the following list for a description of each mode.)

040 Lower reflection CD adjustment

Mode Description

041 Lower reflection CD EF balance 042 Lower reflection CD EF gain 043 Lower reflection CD ABCD gain 044 Lower reflection CD focus gain 045 Lower reflection CD tracking gain 046 Lower reflection CD RF offset 047 Lower reflection CD RF gain 048 Lower reflection CD focus bias

050 CD adjustment

Mode Description

051 CD EF balance 052 CD EF gain 053 CD ABCD gain 054 CD focus gain 055 CD tracking gain 056 CD RF offset 057 CD RF gain 058 CD focus bias

– 8 –

060 Sled movement

Mode Description

061 Sled in 062 Sled out 5

070 Automatic adjustment

Mode Description

071 Focus search 072 Access 32 073 ADER check 074 Tracking sensitivity adjust

090 NV relation

Mode Description

091 NV clear 092 Power OFF 093 Function code change

Audio Mode

• Enter the test mode and press the VOLUME – key. Then, press the ( key and the VOLUME + key in this turn to enter audio mode.

• When entering another mode, refer to the configuration of test mode.

1. Structure of Audio Mode

Audio mode

1 0 0

p key

” key

Audio playback test

1 1 0

p key

” key

1kHz 0dB L/R

1 1 1

” key

Infinity Zero

1 1 2

” key

1kHz 0dB L

1 1 3

” key

1kHz 0dB R

1 1 4

” key

1kHz –20dB L/R

1 1 5

” key

20Hz –20dB L/R

1 1 6

” key

20kHz –20dB L/R

1 1 7

” key

16kHz De-Emphasis

L/R

1 1 8

” key

100Hz 0dB L/R

1 1 9

” key

headphones output

–12dB

–

–12dB

–20dB

–40dB

• The mode No. 11 1 is for S/N and crosstalk. The mode No. 1 15 is for distortion factor and frequency characteristics.

• When the VOLUME +/– keys is pressed in any mode, the volume of the headphones is changed (increased/decreased) in units of one step. When the + / = keys is pressed, the volume of the headphones is maximized/minimized.

• For the volume value, any changed value remains as it is basically. However, when the volume is switched from 114 to 115 or 118 to 119, it returns the default value.

– 9 –

Power Mode

• Enter the test mode and press the VOLUME – key. Then, press the ( key and the VOLUME – key in this turn to enter power mode.

• When entering another mode, refer to the configuration of test mode.

1. Structure of Power Mode

Power mode

3 0 0

p key

” key

UNREG check

31 0

p key

” key

Power OFF

3 1 1

” key

Overall Adjustment Mode

• Enter the test mode and press the VOLUME + key to enter over all adjustment mode.

• When entering another mode, refer to the configuration of test mode.

• When the overall adjustment mode is entered, the LCD on the remote commander display the following :

040 Auto?

1. Structure of Overall Adjustment Mode

Overall adjustment mode Auto?

” key

Start ?

” key (to discriminate between CD and MO)

CD automatic

adjustment

MO automatic

adjustment

p key

p key p key

Adjustment mode Manu ?

– 10 –

SECTION 5

ELECTRICAL ADJUSTMENTS

Notes for Adjustment

• In this set, automatic adjustment of CD and MO can be performed by entering the test mode.

• Adjustments are performed in the overall adjustment mode. If an item is determined as NG, the item is readjusted in servo mode.

Adjustment Method in Overall Adjustment Mode

1. Enter the test mode and press the VOLUME + key to enter overall adjustment mode.

2. Insert the CD test disc (TGYS-1) or SONY MO disc (recorded) commercially available.

3. Press the ( key twice. The disc is determined whether it is CD or MO and each adjustment mode is set. Automatic adjustments are performed in the order of the items listed below.

• In CD Automatic adjustment Mode

No. Mode Description

1 061 Sled in 2 071 Focus search 3 062 Sled out 5 4 051 CD EF balance 5 052 CD EF gain 6 051 CD EF balance 7 053 CD ABCD gain 8 054 CD focus gain

9 055 CD tracking gain 10 056 CD RF offset 11 057 CD RF gain 12 056 CD RF offset 13 058 CD Focus bias

• In MO Automatic adjustment Mode

No. Mode Description

1 061 Sled in 2 011 FE offset 3 012 TE offset 4 071 Focus search 5 062 Sled out 6 031 MO EF balance 7 032 MO EF gain 8 031 MO EF balance

9 033 MO ABCD gain 10 034 MO focus gain 11 035 MO tracking gain 12 036 MO RF gain 13 037 MO ADIP gain 14 039 MO focus bias A 15 073 ADER check 16 071 Focus search 17 031 MO EF balance 18 032 MO EF gain 19 031 MO EF balance 20 033 MO ABCD gain 21 034 MO focus gain 22 035 MO tracking gain 23 036 MO RF gain 24 037 MO ADIP gain 25 039 MO focus bias A 26 073 ADER check 27 061 Sled in 28 071 Focus search 29 041 Low reflection CD EF balance 30 042 Low reflection CD EF gain 31 041 Low reflection CD EF balance 32 043 Low reflection CD ABCD gain 33 044 Low reflection CD focus gain 34 045 Low reflection CD tracking gain 35 046 Low reflection CD RF offset 36 047 Low reflection CD RF gain 37 061 Sled in 38 071 Focus search 39 041 Low reflection CD EF balance 40 042 Low reflection CD EF gain 41 041 Low reflection CD EF balance 42 043 Low reflection CD ABCD gain 43 044 Low reflection CD focus gain 44 045 Low reflection CD tracking gain 45 046 Low reflection CD RF offset 46 047 Low reflection CD RF gain

– 11 –

* Remote commander display during automatic adjustment

)

057  

Adjustment value (flashing)

Mode No. under adjustment

4. If result of automatic adjustment is OK, the following display appears.

047 

5. If result of automatic adjustment is NG, the following display appears.

051 

NG mode No.

* If NG, enter servo mode to perform automatic adjustment of the

item determined as NG.

Adjustment in Servo Mode Method

1. When each adjustment mode is set according to the structure of servo mode, the lower two digits of the mode No. and the adjustment value written in EEPROM are displayed and lit on the LCD on the remote commander.

End-OK

Error code



052  

Adjustment value (lit)

Mode No.

2. When the P key is pressed, the following display appears and the automatic adjustment is performed.

052  

Adjustment value (flashing)

Note)Although the VOLUME +/– keys can be used to change

the adjustment value to any value, they should not be used whenever possible.

3. When the automatic adjustment is completed, the flashing adjustment value is lit.

052  

Adjustment value (lit

– 12 –

SECTION 6 DIAGRAMS

6-1. EXPLANATION OF IC TERMINALS

IC801 RU6815MF-0003 (FORMER TYPE), RU6815MF-0004 (NEW TYPE) (SYSTEM CONTROL)

Pin No. Pin Name I/O Pin Description

1 – Not used (Fixed at “L” ). 2 UREG MON I Unreg voltage monitor input. 3 – Not used (Fixed at “L” ). 4 VREF I Reference voltage for power supply voltage adjustlment. 5 PLAY KEY I Set PLAY key input. 6 OPEN/CLS SW I OPEN/CLOSE switch input. L : Close 7 RMC KEY I Remote commander key input. 8 SET KEY I Set key input.

9 XRESET I Systen reset input (At reset : “L” ). 10 AVDD – A/D converter power supply (+2.6V or +2.8V). 11 AVSS – A/D converter Ground. 12 TYPE 0 I Model discrimination terminal (Fixed at “H” ). 13 TYPE 1 I Model discrimination terminal (Fixed at “L” ). 14 TYPE 2 I Model discrimination terminal (Fixed at “L” ). 15 TYPE 3 I Model discrimination terminal (Fixed at “L” ). 16 HOLD SW I Set HOLD switch input. 17 VREG CON O 2.5V voltage on/off switch (Sub terminal) (not used). 18 – Not used (Open). 19 – Not used (Open). 20 MCK I Master clock input. 21 – Not used (Open). 22 VDD – Digital power supply (+2.6V or +2.8V). 23 VSS – Digital Ground. 24 – Not used (Open). 25 VSS – Digital Ground. 26 AVLS SW I Set AVLS switch input. 27 DSP SINT I Interrupt input from DSP. 28 DBB 0 I DIGITAL MEGA BASS switch input (MID). 29 DBB 1 I DIGITAL MEGA BASS switch input (MAX). 30 OPR LED O LED drive output. 31 XWK CLR O Power IC wakeup factor latch clear output and motor driver IC control signal outpt. 32 ADJUST I “Normally, Test mode select input (“L” : Test mode) 33 SLEEP O Power supply circuit OFF signal output. 34 SBUS CLK O SBB serial clock output. 35 SBUS DATA O SBB serial data output. 36 – Not used (Open). 37 SLD 1 MON I Sled servo timing signal input. 38 SLD 2 MON I Sled servo timing signal input. 39 CLV VCON O Spindle servo drive voltage control output. 40 APC REF O Laser power control output. 41 V28-CON O Power voltage (+2.6V or +2.8V) correction control output. 42 CLV U MON I Spindle servo timing signal input. 43 CLV V MON I Spindle servo timing signal input. 44 CLV W MON I Spindle servo timing signal input. 45 CLV U CON O Spindle servo drive signal output. 46 CLV V CON O Spindle servo drive signal output. 47 CLV W CON O Spindle servo drive signal output.

– 13 –

Pin No. Pin Name I/O Pin Description

48 – Not used (Open). 49 – Not used (Open). 50 VDD – Digital power supply (+2.6V or +2.8V). 51 VPP – Power for on board light. 52 VSS – Digital ground. 53 SLD 1R CON O Sled motor control signal output. 54 SLD 1F CON O Sled motor control signal output. 55 SLD 2R CON O Sled motor control signal output. 56 SLD 2F CON O Sled motor control signal output. 57 – Not used (Open). 58 – Not used (Open). 59 – Not used (Open). 60 – Not used (Open). 61 SPCK O Serial clock output for Remote control communication. Not used (Open). 62 RMC DTCLK I/O Serial data input/output for Remote control communication.

63 – 66 – Not used (Open).

67 SLD V CON O Sled servo outer voltage control output. 68 SLC TR ON O Baypass transistor control output for sled drive power supply. 69 HP MUTE O Headphone amplifier mute output. 70 HP STBY O Headphone amplifier standby output. 71 RMC SEL O TSB/SSB selection signal output to remote commander terminal. Not used (Open). 72 NV D0 O Serial data signal output for NVRAM. 73 NV D1 I Serial data signal input from NVRAM. 74 NV CLK O Serial clock signal output for NVRAM. 75 NV CS1 O Chip select signal output for NVRAM. 76 VDD – Digital power supply (+2.6V or +2.8V).

77 – 79 LCD VL2 – 0 I LCD drive level power supply (Connected ground).

80 VSS – Digital ground. 81 – 87 – Not used (Open). 88 – 96 LCD SEG0 – 8 – LCD Segment terminal. Not used (Open).

97 – 100 LCD COM0 – 3 – LCD common terminal. Not used (Open).

– 14 –

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