Sony MZN-420-D Service manual

MZ-N420D

SERVICE MANUAL

Ver 1.1 2004.10

US and foreign patents licensed from Dolby Laboratories.

• SonicStage, OpenMG and the OpenMG

logo, MagicGate, Memory Stick and the MagicGate Memory Stick logo, Memory Stick and the Memory Stick logo, Net MD and the N et MD logo are trademarks of Sony Corporation.

• Microsoft, Windows, Windows NT and

Windows Media are t rademarks or registered tradema rks of Microsoft Corporation in the Uni ted States and /or other countries.

• IBM and PC/AT are registered

trademarks of International B u s iness Machines Corpo ration.

• Macintosh i s a t r ademark of Apple

Computer, Inc. in the United States and/ or other countries.

• MMX and Pentium are t rademarks or

registered trad em arks of Intel Corporation.

• All other trademarks and registered

trademarks are trademarks or registered trademark s of their respective holders.

• ™ and ® marks are omitted in this

manual.

US Model

Canadian Model

E Model

Model Name Using Similar Mechanism MZ-NE410 Mechanism T ype MT-MZN710-177 Optical Pick-up Name LCX-5R

SPECIFICATIONS

Audio playing system

MiniDisc digital audio system

Laser diode properties

Material: GaAlAs Wavelength: λ = 790 nm Emission duration: cont inuous Laser output: less than 44.6 µW (This output is th e value measured at a d istance of 200 mm from the objective lens surface on the optical pick-up block with 7 mm apertur e . )

Recording and playback time (when using MDW-80)

Maximum 160 min. in monaural Maximum 320 min. in LP4 stereo

Revolutions

Approx. 380 rpm to 2,700 rpm

Error correction

ACIRC (Advanced Cross Interleave Reed Solomon Code)

Sampling frequency

44.1 kHz

Coding

ATRAC (Adaptive TRansform Acoustic Coding) ATRAC3 — LP2/LP4

9-877-707-02 Sony Corporation

– Continued on next page –

PORTABLE MINIDISC PLAYER

MZ-N420D

Modulation system

EFM (Eight to Fourteen Modula tion)

Number of channels

2 stereo channels 1 monaural channel

Frequency response

20 to 20,000 Hz ± 3 dB

Outputs

i: stereo mini-jac k , maximum output level 5 mW + 5 mW, load impedance 24 Ω (US) 5 mW + 5 mW, load impedance 16 Ω (EXCEPT US)

General

Power requirements

One LR6 (size AA) alkaline battery (not supplied)

Recommended temperature for check-in/check-out

+5 ° C (+41° F) or higher

Dimensions

Left - hand model Approx. 81 × 28.9 × 74.4 mm (w/h/d) (31/4 ×

/16 × 3 in.) without projections. Right - hand model Approx. 81 × 30.7 × 74.4 mm (w/h/d) (3

/4 × 3 in.) without projections.

sMas

Left - hand model Approx. 106 g (3.8 oz) the player only Right - hand model Approx. 113.3 g (4.0 oz) the player only

Design and specifications are subject to change without notice.

/4 ×

Supplied accessories

Headphones/earphone s (1) Dedicated USB cable (1) CD-ROM (SonicStage Ver. 2.0 and MD Sim ple Burner Ver. 2.0) (1)*

Recordable disc (US and Canadian models only) (1)

Do not play a CD-ROM on an audio CD player.

Battery life

When SP Stereo LP2 Stereo LP4 Stereo

playing transferring out audio

data from the computer

When using a new Sony LR6 (size AA) “STAMINA” alkaline dry battery (pr oduc e d in Ja pan).

Measured in accordance with the JEITA (Japan Electronics and Informati on Te ch nology Industries Association) standard.

The numbers of tracks that can be checked out dif f ers ac cording to the computer’s operating environment.

Approx. 42 hours Approx. 48 hours Approx. 56 hours 75 tracks (of about

5 minutes each)

300 tracks ( of a bout 5 minutes each)

600 tracks (o f about 5 minutes each)

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT . NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

CAUTION

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

MZ-N420D

1. SERVICING NOTES....................................................... 4

2. GENERAL.......................................................................... 5

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.

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.

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 ˚C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 ˚C . Caution: The printed pattern (copper foil) may peel away if the

heated tip is applied for too long, so be careful!

• Strong viscosity Unleaded solder is more viscous (sticky , less prone to flow) than ordinary solder so use caution not to let solder bridges occur such as on IC pins, etc.

• Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder.

3. DISASSEMBLY

3-1. Case (Lower) .................................................................. 7

3-2. Upper Panel Section....................................................... 7

3-3. LCD Module, Button (Control) ..................................... 8

3-4. MAIN Board................................................................... 8

3-5. Mechanism Deck (MT-MZN710-177) .......................... 9

3-6. Set Chassis Assy............................................................. 9

3-7. OP Service Assy (LCX-5R) ......................................... 10

3-8. Holder Assy .................................................................. 11

3-9. DC Motor (Sled) (M602) ............................................. 11

3-10. DC Motor (Over Write Head Up/Down) (M603),

DC SSM18B Motor (Spindle) (M601) ...................... 12

4. TEST MODE.................................................................... 13

5. ELECTRICAL ADJUSTMENTS............................... 18

6. DIAGRAMS

6-1. Block Diagram .............................................................38

6-2. Printed W iring Board - MAIN Board (Side A) ........... 39

6-3. Printed W iring Board - MAIN Board (Side B) ........... 40

6-4. Schematic Diagram - MAIN Board (1/4).................... 41

6-5. Schematic Diagram - MAIN Board (2/4).................... 42

6-6. Schematic Diagram - MAIN Board (3/4).................... 43

6-7. Schematic Diagram - MAIN Board (4/4).................... 44

7. EXPLODED VIEWS

7-1. Case Section ................................................................. 55

7-2. Chassis Section............................................................. 56

7-3. MAIN Board Section ...................................................57

7-4. Mechanism Deck Section-1 (MT-MZN710-177)........ 58

7-5. Mechanism Deck Section-2 (MT-MZN710-177)........ 59

8. ELECTRICAL PARTS LIST ....................................... 60

MZ-N420D

SECTION 1

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care.

NOTES ON LASER DIODE EMISSION CHECK

Never look into the laser diode emission from right above when checking it for adjustment. It is feared that you will lose your sight.

NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (LCX-5R)

The laser diode in the optical pick-up block may suffer electrostatic break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform measures against electrostatic break-down sufficiently before the operation. The flexible board is easily damaged and should be handled with care.

Providing the required system environment

System requirements

The following system environme nt is required in order to use the SonicStage Ver.2.0/MD Simple Burner Ver.2.0 software for the MD Walkman.

Computer IBM PC/AT or Compatible

• CPU: Pentium II 400 MHz or higher (Pentium III 450 MHz or higher

is recommended.)

• Hard disk drive space: 200 MB or more (1.5 GB or more is

recommended) (The amount space will vary according to Windows version a nd t he number of music files stored on the hard disk.)

• RAM: 64 MB or more (128 MB or more is recommended) Others

• CD drive (capable of digit al pl ayback by WDM)

• Sound Board

• USB port (supports USB (previously USB 1.1))

Operating System

Display High Color (16bit) or higher, 800 × 600 dots or better (1024 × 768 dots

Others • Internet access: for Web registration, EMD services and CDDB

This software is not supported by the following environments:

OSs other than the indic a te d above Personally constructed PCs or opera ting systems An environment that is an upgrade of the original manufacturer-installed operating system Multi-boot environment Multi-monitor environment Macintosh

Notes

We do not ensure trouble-free operation on all computers that satisfy the system re quir e ments. The NTFS format of Windows XP/Windows 2000 Professional can be used only with the standard

(factory) settings.

We do not ensu re tr oub le -fr e e oper a tion of the system suspend, sleep, or hibernation fu nc tion on all

computers.

For Windows 2000 Professional users, install Service Pack 3 or later version be fore using the

software.

Factory in stalled: Windows XP Media Center Edit i on 20 04 /Windows XP Media Cent er Edition/Windows XP Professional/Windows XP Home Edition/ Windows 2000 Professional/Windows Millennium Edition/Windows 98 Second Edition

or better is recommended)

• Windows Media Player (version 7.0 or higher) insta lled for playing

WMA files

laser-tap

OPTICAL PICK-UP FLEXIBLE BOARD

• In performing the repair with the power supplied to the set, removing the MAIN board causes the set to be disabled. In such a case, make a solder bridge to short SL802 (OPEN/ CLOSE) on the MAIN board in advance.

- MAIN board (Side B) -

SL802

(OPEN/CLOSE)

Handle the FLEXIBLE board (over write head) with care, as it has been soldered directly to the MAIN board. In repairing the component side of MAIN board, connect the FLEXIBLE board (over write head) and the MAIN board with the lead wires in advance.

FLEXIBLE board (over write head)

upper panel ass

MAIN board

•This set requires the patch data in the nonvolatile memory (IC852) to be rewritten using the application, when the MAIN board was replaced. (See page 28)

SECTION 2

GENERAL

This model comes in two designs with different shapes and na me s f or the buttons.

Front of the player

MZ-N420D

This section is extracted from instruction manual.

1 2

On the following pages of this manual, explanations are given using the illustration in the top-left of this page.

A Display window B VOL (VOLUME ) +* and – button

The VOL (VOLUME ) + button has a

tactile dot.

C 4-position control key

ENT/NX (ENTER/NX) (enter/play/pause)*

. and > (search/AMS) x/CANCEL (stop/cancel)

The ENT/NX (ENTER/NX)button

has a tactile dot.

D MENU butt on E GROUP button F USB jack

When connecting to yo ur computer, connect the dedicated USB cable to this jack.

G HOLD switch H i (headphones/earphones) jack

6 7

Back of the player

A OPEN button B Hand strap hole

Use the hole to attach your own strap.

C Battery compartment lid

The display window of the player

A Disc indication B Group mode indication

Lights up when group mo de i s on.

C Track nu m ber display D Battery level indication

Shows approximate battery condition.

E Play mode indication

Shows play mode of the MD.

F SOUND indication G Disc, group, track indicat io n H Character information display

Displays the track names, elapsed time, etc.

4 5

6 7

MZ-N420D

• This set can be disassembled in the order shown below.

SET

3-1. CASE (LOWER)

(Page 7)

3-4. MAIN BOARD

(Page 8)

3-2. UPPER PANEL SECTION

(Page 7)

SECTION 3

DISASSEMBLY

In order to remove mechanism deck, please remove MAIN board and upper panel section.

3-5. MECHANISM DECK

(MT-MZN710-177) (Page 9)

3-6. SET CHASSIS ASSY

(Page 9)

3-3. LCD MODULE,

BUTTON (CONTROL) (Page 8)

3-7. OP SERVICE ASSY

(LCX-5R) (Page 10)

3-8. HOLDER ASSY

(Page 11)

3-9. DC MOTOR

(SLED) (M602) (Page 11)

3-10. DC MOTOR (OVER

WRITE HEAD UP/ DOWN)(M603), DC SSM18B MOTOR (SPINDLE) (M601) (Page 12)

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

3-1. CASE (LOWER)

two screws (M1.4)

MZ-N420D

two screws (M1.4)

3-2. UPPER PANEL SECTION

set chassis assy

torsion spring (pop up-L)

flexible board (CN872)

Remove the case (lower) in the direction of the arrow.

upper panel sectio

torsion spring (pop up-L)

two step screws

Slide the open slider in the direction of the arrow, and open the upper panel section.

MZ-N420D

)

3-3. LCD MODULE, BUTTON (CONTROL)

two claws

two screws

four screws

LCD module

button (control)

open locke

3-4. MAIN BOARD

Remove two solders of the flexible board (over write head).

four screws (M1.4)

flexible board (CN872)

case (upper) sub assy

MAIN board

battery terminal board (+

battery terminal (–)

flexible board (optical pick-up) (CN501)

flexible board (motor) (CN701)

3-5. MECHANISM DECK (MT-MZN710-177)

The portion which projected is removed.

step screw (MD)

mechanism deck (MT-MZN710-177)

MZ-N420D

3-6. SET CHASSIS ASSY

ground spring (USB)

battery case

two screws (TP 1.7

2.5)

set chassis ass

tension spring

(lock)

MZ-N420D

3-7. OP SERVICE ASSY (LCX-5R)

washer (0.8-2.5)

screw (M1.4)

rack spring

gear (SA)

screw (M1.4)

thrust detent spring

Pull off lead screw.

OP service assy (LCX-5R)

over write head section

Opening the over write head toward the direction A, remove the OP service assy (LCX-5R) toward the direction B.

Note: Do not open the entire assy forcibly,

when opening the over write head.

3-8. HOLDER ASSY

convex portion

Open the holder assy.

boss

MZ-N420D

holder ass

3-9. DC MOTOR (SLED) (M602)

two screws (M1.4)

DC motor (sled) (M602)

washer (0.8-2.5)

boss

gear (SA)

Remove six solders of the motor flexible board.

MZ-N420D

3-10. DC MOTOR (OVER WRITE HEAD UP/DOWN)(M603), DC SSM18B MOTOR (SPINDLE) (M601)

Remove six solders of the motor flexible board.

tapping screw

motor cover

DC motor (over write head up/down) (M603)

Note: Press-fit the gear (HA) up to the position of

the DC motor (over write head up/down) (M603) as shown below.

three tapping screws

gear (HA)

gear (HB)

gear (HA)

3.15 mm

DC motor (over write head up/down) (M603)

DC SSM18B motor (spindle) (M601)

gear (HC)

SECTION 4

IC852

TEST MODE

MZ-N420D

Outline

•This set provides the Overall adjustment mode that allows CD and MO discs to be automatically adjusted when in the test mode. In this overall adjustment mode, the disc is discriminated between CD and MO, and each adjustment is automatically executed in order. If a fault is found, the system displays its location. Also, the manual mode allo ws each indi vidual adjustment to be automatically adjusted.

• Operation in the test mode is performed with the set.

Setting Method of Test Mode

There are two different methods to set the test mode: 1 Short SL803 (TEST) on the MAIN board with a solder bridge

(connect pin <zx. of IC801 to the ground). Then, turn on the power .

– MAIN Board (Side B) –

Operation in Setting the Test Mode

•When the test mode becomes active, first the display check mode is selected.

• Other mode can be selected from the display check mode.

•When the test mode is set, the LCD repeats the following display.

Set LCD display

PGM

All lit

All off

Microcomputer version display

888

009

SOUND 1 2

V1.600

SL803

(TEST)

2 In the normal mode, turn on the HOLD . switch. While

pressing the ENTER/NX key press the following order:

[VOLUME +]t[VOLUME +]t[VOLUME --]t[VOLUME --] t[VOLUME +]t[VOLUME --]t[VOLUME +]t[VOLUME --]

t[GROUP]t[GROUP]

Note: If electrical adjustment (CD and MO overall adjustment) has not

been finished completely, “ERROR” is displayed on LCD of the set.

• When the ENTER/NX key is pressed and hold down, the dis- play at that time is held so that display can be checked.

Releasing the Test Mode

For test mode set with the method 1: Turn off the power and open the solder bridge on SL803 (TEST) on the MAIN board.

Note: Remove the solders completely. Remaining could be shorted with

the chassis, etc.

For test mode set with the method 2: Turn off the power.

MZ-N420D

Configuration of Test Mode

[Test Mode $Display Check Mode%]

Press the

key

[Manual Mode]

Press the

x/CANCEL

key

[Servo Adjustment] [Audio Adjustment] [Power Supply Adjustment]

[OP Alignment Adjustment]

Press the

key

[Overall Adjustment Mode]

Press the

x/CANCEL

Press the

key

[GROUP]

[Electrical Offset Adjustment]

Power Supply Adjustment Auto Item Feed

CD Overall Adjustment/ MO Overall Adjustment

key

[Self-Diagnosis Result Display Mode]

Press the

x/CANCEL

[VOLUME +]

key

[Sound Skip Check Result Display Mode]

Press the

x/CANCEL

[VOLUME --]

key

[Key Check Mode]

The key check quits, or open the upper panel

Manual Mode

Mode to adjust or check the operation of the set by function. Normally, the adjustment in this mode is not executed. However, the Manual mode is used to clear the memory, power supply adjustment, and laser power check before performing automatic adjustments in the Overall Adjustment mode.

[VOLUME +]

[Major item switching]

[VOLUME --]

key

x/CANCEL

key

[VOLUME +]

[Medium item switching]

[VOLUME --]

key

x/CANCEL

key

[Minor item switching]

[Adjusted value variation] [VOLUME +]

[VOLUME --]

[Adjusted value write]

ENTER/NX

key: 100th place of item

number increase.

key: 100th place of item

number decrease.

key: 10th place of item

number increase.

key: 10th place of item

number decrease.

key: Unit place of item number

increase.

key:Unit place of item number

decrease.

key: Increases the adjusted

value of the 1st digit

key: Decreases the adjusted

value of the 1st digit

key :When adjusted value is

changed: Adjusted value is written. When adjusted value is not changed: That item is adjusted automatically.

•Transition Method in Manual Mode

1. Set the test mode (see page 13).

2. Press the > to activate the manual mode where the LCD display as shown below.

Set LCD display

000

Manual

3. During each test, the optical pick-up moves outward or inward while the onds respectively.

4. Each test item is assigned with a 3-digit item number; 100th place is a major item, 10th place is a medium item, and unit place is a minor item. The values adjusted in the test mode are written to the nonvolatile memory (for the items where adjustment was made).

> or . key is pressed for several sec-

MZ-N420D

5. The display changes a shown below each time the [MENU] key is pressed.

• Address & Adjusted Value Display

Set LCD display

011

C68S16

• Jitter Value & Adjusted Value Display

Set LCD display

011

0FEJ16

• Block Error Value & Adjusted Value Display

Set LCD display

011

063B16

• ADIP Error Value & Adjusted Value Display

Set LCD display

011

049A16

• Focus Drive Value & Adjusted Value Display

Set LCD display

011

000F16

item number adjusted value address

item number adjusted value jitter value

item number adjusted value block error value

item number adjusted value ADIP error value

item number adjusted value focus drive value

Overall Adjustment Mode

Mode to adjust the servo automatically in all items. Normally, automatic adjustment is executed in this mode at the repair. For further information, refer to “SECTION 5 ELECTRICAL ADJUSTMENTS” (see page 18).

Self-Diagnosis Result Display Mode

This set uses the self-diagnostic function system in which if an error occurred during the recording or playing, the mechanism control block and the power supply control block in the microcomputer detect it and record its cause as history in the nonvolatile memory. By checking this history in the test mode, you can analyze a fault and determine its location. Total recording time is recorded as a guideline of how long the optical pick-up has been used, and by comparing it with the total recording time at the time when an error occurred in the self-diagnosis result display mode, you can determine when the error occurred. Clear both self-diagnosis history data and total recording time, if the optical pick-up was replaced.

• Self-Diagnosis Result Display Mode Setting Method

1. Set the test mode (see page 13).

2. In the display check mode, press the [GROUP] key activates the self-diagnosis result display mode where the LCD display as shown below.

Set LCD display

0XX

1 0000

history code

3. Then, each time the by one as shown below. Also, the LCD display ascends by one when the . key is pressed.

> key is pressed, LCD display descends

error display code

Total recording time when error occurred

0 XX 1 ****

0 XX N ****

• Item Title Display

Set LCD display

011

item number

LrefPw

item title

However in the power mode (item number 700’s), only the item is displayed.

6. Quit the manual mode, and press the x/CANCEL key to re-

turn to the test mode (display check mode).

0 XX N1****

0 XX N2****

0 XX R_****

: Error code

****

: Total recording time

If the

[GROUP] key is pressed with this display , the LCD switc hes

to the simple display mode.

4. Quit the self-diagnosis result display mode, and press the

x/CANCEL key to return to the test mode (display check mode).

MZ-N420D

• Description of Error Indication Codes

Problem Indication code Meaning of code Simple display Description

No error 00 No error --- No error

Servo system error 02 High temperature Temp High temperature detected

03 Focus error Fcus Disordered focus or can not read an address 04 Spindle error Spdl Abnormal rotation of disc

11 TOC error TOC Faulty TOC contents

TOC error 12 Data reading error Data Data could not be read at SYNC

13 TOC address error Tadr TOC address data error

Power supply system error 22 Low battery LBat Momentary interruption detected

31 Offset error Ofst Offset error

Offset system error 33

35 36 Mirror error Mirr Mirror retry over

Illegal access target address was specified

Focus error ABCD offset error

Tracking error Offset error

X1 tracking error Offset error

MD DATA 2 disc error

Adrs Attempt to access an abnormal address

ABCD Focus error ABCD offset error

TE Tracking error Offset error

X1TE X1 tracking error Offset error

MD2 MD DATA 2 disc error

• Description of Indication History

History code number Description

1 The first error N The last error N1 One error before the last. N2 Two errors before the last. R_ Total recording time

Reset the Error Display Code

After servicing, reset the error display code.

• Setting Method of Reset the Error Display Code

1. Set the test mode (see page 13).

2. Press the [GROUP] key activates the self-diagnosis result dis- play mode.

3. To reset the error display code, press the ENTER/NX key (twice) when the code is displayed (except “R_****”). (All the data on the 1, N, N1, and N2 will be reset)

MZ-N420D

Sound Skip Check Result Display Mode

This set can display the count of errors that occurred during the recording/playing for checking.

• Setting Method of Sound Skip Check Result Display Mode

1. Set the test mode (see page 13).

2. Press the [MENU] key or [VOLUME +] key, and the playing

or recording sound skip result display mode becomes active respectively where the LCD displays the following.

Set LCD display

000

P**R**

3. When the

on the LCD, and each time the play item moves down by one as shown below. Also, if the . key is pressed, the display item moves up by one, then if the [VOLUME +] key is pressed, the display in the r ecord mode appears. When the [VOLUME +] key is pressed, total error count is displayed on the LCD, and each time the > key is pressed, the display item moves down by one as sho wn below. Also, if the . key is pressed, the display item moves up by one, then if the [MENU] key is pressed, the display in the play mode appears.

Playing sound skip result display

[MENU] key is pressed, total error count is displayed

Total count of record system errors (hex.)

Total count of play system errors (hex.)

> key is pressed, the dis-

Recording sound skip result display

• Cause of Sound Skip Error

Cause of error Description of error

EIB Sound error correction error

Play

Record

4. To quit the sound skip check result display mode and to return to the test mode (display check mode), press the x/CANCEL key.

• Setting Method of Key Check Mode

1. Set the test mode (see page 13).

2. Press the[VOLUME --] key activates the ke y c heck mode.

Stat Decoder status error Adrs Address access error BEmp Buffer is empty

BOvr

Bful Rtry Retry times over

Set LCD display

Buffer is full, and sounds were dumped

Buffer capacity becomes less, and forcible writing occurred

004

3. When each key on the set is pressed, its name is displayed on the set LCD. (Operated position is displayed for 4 seconds after the slide switch is operated.

Example1: When the > key on the set is pressed:

Set LCD display

0 00 P**R**

0 00 EIB **

0 00 Stat**

0 00 Adrs**

0 00 BEmp**

0 00 ######

P**R** ** ######

: Total play/record errors (hex.) : Counter of sound skip check each item (hex.) : 6-digit address where sound was skipped last (hex.)

0 00 P**R**

0 00 BOvr**

0 00 Bful**

0 00 Rtry**

0 00 ######

004

4. When all keys were checked or if the upper panel is opened, the key check mode quits and the test mode (display check mode) comes back.

MZ-N420D

SECTION 5

ELECTRICAL ADJUSTMENTS

Outline

• In this set, automatic adjustment of CD and MO can be performed by entering the test mode. However, before starting automatic adjustment, the memory clear, power supply adjustment and laser power check must be performed in the manual mode.

Precautions for Adjustment

1. Adjustment must be done in the test mode only.

After adjusting, release the test mode.

2. Use the following tools and measuring instruments.

•Test CD disc TDYS-1 (Part No. : 4-963-646-01)

• SONY MO disc available on the market

• Digital voltmeter

• Laser power meter LPM-8001 (Part No. : J-2501-046-A)

•Thermometer (using the Temperature Correction)

• Personal computer

• USB cable

3. Unless specified otherwise, supply DC 1.5V from battery terminals.

4. Switch position

HOLD . switch..................................... ON

Adjustment Sequence

1. NV Reset (item number: 021) (EEPROM clear)

2. Temperature Correction (item number: 015)

3. Power Supply Manual Adjustment

4. Laser Power Check

5. CD Overall Adjustment (item number: 031)

Overall Adjustment (item number: 034)

7. RESUME Clear (item number 043)

8. Rewriting the Patch Data (at replacement of the MAIN board)

9. Rewriting the NV values

     

Manual Mode

     

 

Overall Mode

  



Manual Mode

 

NV Reset

• Setting Method of NV Reset

1. Select the manual mode of the test mode, and set item number 021 NV Reset (see page 14).

Set LCD display

021

###SCC

2. Press the

ENTER/NX key.

Set LCD display

3. Press the ENTER/NX key once more.

Set LCD display

021

Res***

NV reset (after several seconds)

021

Reset!

4. Press the x/CANCEL key to quit the manual mode, and

return to the test mode (display check mode).

Temparature Correction

• Adjustment Method of Temperature Correction

1. Select the manual mode of the test mode, and set the item number 015 (see page 14).

Set LCD display

015

###S**

: Adjusted value

2. Measure the ambient temperature.

3. Adjust with [VOLUME +] or [VOLUME --] key so that the ad- justed value (hexadecimal value) becomes the ambient temperature. (Initial value : 19h = 25˚C, Adjusting range : 80h to 7fh (–128˚C to +127˚C))

4. Press the ENTER/NX key to write the adjusted value.

Power Supply Manual Adjustment

• Adjustment sequence

Adjustment must be done with the following steps.

1. VC1_LOW (PB) adjustment (item number : 741)

2. VC1_HIGH (REC) adjustment (item number : 742)

3. VC2_LOW adjustment (item number : 743)

4. VC2_HIGH adjustment (item number : 744)

5. REG1 adjustment (item number : 745)

6. REG3_LOW1 adjustment (item number : 747)

7. REG3_LOW2 adjustment (item number : 748)

8. REG3_HIGH adjustment (item number : 749)

9. VREC_LOW (X2 speed) adjustment (item number : 751)

10. VREC_MIDDLE (X4 speed)adjustment (item number : 752)

11. VREC_HIGH (HEAD MOTOR) adjustment (item number : 753)

• Setting Method of Power Supply Manual Adjustment

1. Make sure that the power supply voltage is 1.5V.

2. Select the manual mode of the test mode (see page 14).

3. Set item number.

Note: Power supply adjustment auto item feed mode (page 23) is

available to perform the temperature Correction and Power Supply Adjustment without entering the manual mode.

021

ResOK?

MZ-N420D

• Adjustment Method of VC1_LOW (PB) (item number: 741)

Set LCD display

741

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1928 (VCO1) on the MAIN

board, and adjust [VOLUME +] key (voltage up) or [VOLUME --] key (voltage down) so that the voltage becomes 2.35 ± 0.05V.

digital

voltmete

MAIN board

TP1928 (VCO1)

BATT – (GND)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

• Adjustment Method of VC1_HIGH (REC) (item number: 742)

Set LCD display

742

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1928 (VCO1) on the

MAIN board, and adjust [VOLUME +] key (voltage up) or

[VOLUME --] key (voltage down) so that the voltage becomes

2.50 ± 0.05V.

digital

voltmete

MAIN board

TP1928 (VCO1)

BATT – (GND)

• Adjustment Method of VC2_LOW (item number: 743)

Set LCD display

743

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1905 (VCOUT) on the

MAIN board, and adjust [VOLUME +] key (voltage up) or

[VOLUME --] key (voltage down) so that the voltage becomes

2.30 ± 0.01V.

digital

voltmete

MAIN board

TP1905 (VCOUT)

BATT – (GND)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

• Adjustment Method of VC2_HIGH (item number: 744)

Set LCD display

744

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1905 (VCOUT) on the

MAIN board, and adjust [VOLUME +] key (voltage up) or

[VOLUME --] key (voltage down) so that the voltage becomes

2.55 ± 0.01V.

digital

voltmete

MAIN board

TP1905 (VCOUT)

BATT – (GND)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

MZ-N420D

• Adjustment Method of REG1 (item number: 745)

Set LCD display

745

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1909 (REGO1) on the

MAIN board, and adjust [VOLUME +] key (voltage up) or

[VOLUME --] key (voltage down) so that the voltage becomes

2.05 ± 0.01V.

digital

voltmete

MAIN board

TP1909 (REGO1)

BATT – (GND)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

• Adjustment Method of REG3_LOW1 (item number: 747)

Set LCD display

747

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1907 (REGO3) on the

MAIN board, and adjust [VOLUME +] key (voltage up) or

[VOLUME --] key (voltage down) so that the voltage becomes

1.25 ± 0.01V.

digital

voltmete

MAIN board

TP1907 (REGO3)

BATT – (GND)

• Adjustment Method of REG3_LOW2 (item number: 748)

Set LCD display

748

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1907 (REGO3) on the

MAIN board, and adjust [VOLUME +] key (voltage up) or

[VOLUME --] key (voltage down) so that the voltage becomes

1.25 ± 0.01V.

digital

voltmete

MAIN board

TP1907 (REGO3)

BATT – (GND)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

• Adjustment Method of REG3_HIGH (item number: 749)

Set LCD display

749

AD **

: Adjusted value

1. Connect a digital voltmeter to the TP1907 (REGO3) on the

MAIN board, and adjust [VOLUME +] key (voltage up) or

[VOLUME --] key (voltage down) so that the voltage becomes

1.25 ± 0.01V.

digital

voltmete

MAIN board

TP1907 (REGO3)

BATT – (GND)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

2. Press the ENTER/NX key to write the adjusted value.

Adjustment and Connection Location:MAIN board

(see page 22)

+ 44 hidden pages

Sony MZN-420-D Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

DISASSEMBLY

3-1. CASE (LOWER)

3-2. UPPER PANEL SECTION

3-3. LCD MODULE, BUTTON (CONTROL)

3-4. MAIN BOARD

3-5. MECHANISM DECK (MT-MZN710-177)

3-6. SET CHASSIS ASSY

3-7. OP SERVICE ASSY (LCX-5R)

3-8. HOLDER ASSY

3-9. DC MOTOR (SLED) (M602)

3-10. DC MOTOR (OVER WRITE HEAD UP/DOWN)(M603), DC SSM18B MOTOR (SPINDLE) (M601)

TEST MODE

ELECTRICAL ADJUSTMENTS