Sony MDSJE-440 Service manual

MDS-JE440

SERVICE MANUAL

US and foreign patents licensed form Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Model Name Using Similar Mechanism NEW MD Mechanism Type MDM-7A Optical Pick-up Type KMS-260B/J1N

System

Disc

Laser

Laser output

Laser diode

Revolutions (CLV)

Error correction

Sampling frequency

Coding

Modulation system

Number of channels

Frequency response

Signal-to-noiseratio

Wow and flutter

MiniDisc digital audio system

MiniDisc

Semiconductor laser (λ = 780 nm) Emission duration: continuous

MAX 44.6 µW

1) This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block with 7 mm aperture.

Material: GaAlAs

400 rpm to 900 rpm

ACIRC (Advanced Cross Interleave Reed Solomon Code)

44.1 kHz

ATRAC (Adaptive TRansform Acoustic Coding)/ATRAC 3

EFM (Eight-to-Fourteen Modulation)

2 stereo channels

5 to 20,000 Hz ±0.3 dB

Over 96 dB during play

Below measurable limit

Inputs

ANALOG IN

DIGITAL IN

Outputs

ANALOG OUT

DIGITAL OUT

Jack type: phono Impedance: 47 kΩ Rated input: 500 mVrms Minimum input: 125 mVrms

Connector type: square optical Impedance: 660 nm (optical wave length)

Jack type: phono Rated output: 2 Vrms (at 50 kΩ) Load impedance: over 10 kΩ

Connector type: square optical Rated output: –18 dBm Load impedance: 660 nm (optical wave length)

— Continued on next page —

MINIDISC DECK

General

Power requirements

Where purchased Power requirements

US, Canadian 120 V AC, 60 Hz

AEP, UK, CIS 220 – 230 V AC, 50/60 Hz

Australian 240 V AC, 50/60 Hz

Hong Kong 220 – 240 V AC, 50/60 Hz

Singapore, Malaysia

110 – 120 or 220 – 240 V AC selectable, 50/60 Hz

Supplied accessories

• Audio connecting cords (2)

• Optical cable (1)

• Remote commander (remote) (1)

• R6 (size-AA) batteries (2)

US and foreign patents licensed from Dolby Laboratories.

Design and specifications are subject to change without notice.

Power consumption

Dimensions (approx.)

Mass (approx.)

15 W

430 × 95 × 285 mm (17 × 3

/4 in.) (w/h/d) incl. projecting

parts and controls

3.0 kg (6 lbs 10 oz)

/4 ×

SELF-DIAGNOSIS FUNCTION

The self-diagnosis function consists of error codes for customers which are displayed automatically when errors occur, and error codes which show the error history in the test mode during servicing. For details on how to view error codes for the customer, refer to the following box in the instruction manual. For details on how to check error codes during servicing, refer to the following “Procedure for using the Self- Diagnosis Function (Error History Display Mode)”.

Three- or five-

Self-diagnosis function

The deck’s self-diagnosis function automatically checks the condition of the MD deck when an error occurs, then issues a three- or five-digit code and an error message on the display. If the code and message alternate, find them in the following table and perform the indicated countermeasure. Should the problem persist, consult your nearest Sony dealer.

Three- or fivedigit code/ Message

C11/Protected

C12/Cannot Copy

C13/REC Error

C13/Read Error

Cause/Remedy

The inserted MD is record-protected.

Take out the MD and close the record-

protect slot (page 14).

You tried to record a CD with a format that the external device connected to the deck does not support, such as CD-ROM or video CD.

Remove the disc and insert a music

CD.

The recording was not made properly.

Set the deck in a stable surface, and

repeat the recording procedure.

The inserted MD is dirty (with smudges, fingerprints, etc.), scratched, or substandard in quality.

Replace the disc and repeat the

recording procedure.

The deck could not read the TOC on the MD properly.

Take out the MD and insert it again.

digit code/ Message

C14/Toc Error

C41/Cannot Copy

C71/Din Unlock

E0001/ MEMORY NG

E0101/ LASER NG

Cause/Remedy

The deck could not read the TOC on the MD properly.

Insert another disc.

If possible, erase all the tracks on the

MD (page 32).

The sound source is a copy of commercially available music software, or you tried to record a CD-R (Recordable CD).

The Serial Copy Management System

prevents making a digital copy (page 52). You cannot record a CD-R.

The sporadic appearance of this message is caused by the digital signal being recorded. This will not affect the recording.

While recording from a digital component connected through the DIGITAL IN connector, the digital connecting cable was unplugged or the digital component turned off.

Connect the cable or turn the digital

component back on.

There is an error in the internal data that the deck needs in order to operate.

Consult your nearest Sony dealer.

There is a problem with the optical pickup.

The optical pick-up may have failed.

Consult your nearest Sony dealer.

Procedure for using the Self-Diagnosis Function (Error History Display Mode). Note: Perform the self-diagnosis function in the “error history display mode” in the test mode. The following describes the least required

procedure. Be careful not to enter other modes by mistake. If you set other modes accidentally, press the MENU/NO button to exit the mode.

1. While pressing the AMS knob and x button, connect the power plug to the outlet, and release the AMS knob and x button.

When the test mode is set, “[Check]” will be displayed.

2. Rotate the AMS knob and when “[Service]” is displayed, press the YES button.

3. Rotate the AMS knob and display “Err Display”.

4. Pressing the YES button sets the error history mode and displays “op rec tm”.

5. Select the contents to be displayed or executed using the AMS knob.

6. Pressing the AMS knob will display or execute the contents selected.

7. Pressing the AMS knob another time returns to step 4.

8. Pressing the MENU/NO button displays “Err Display” and exits the error history mode.

9. To exit the test mode, press the REPEAT button. The unit sets into the STANDBY state, the disc is ejected, and the test mode ends.

ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS

Selecting the Test Mode

Display

op rec tm

op play tm

spdl rp tm

retry err

total err

err history

retry adrs

History

Displays the total recording time. When the total recording time is more than 1 minute, displays the hour and minute When less than 1 minute, displays “Under 1 min” The display time is the time the laser is set to high power, which is about 1/4 of the actual recording time.

Displays the total playback time. When the total playback time is more than 1 minute, displays the hour and minute When less than 1 minute, displays “Under 1 min”

Displays the total rotating time of the spindle motor. When the total rotating time is more than 1 minute, displays the hour and minute When less than 1 minute, displays “Under 1 min”

Displays the total number of retry errors during recording and playback Displays “r xx p yy”. xx is the number of errors during recording. yy is the number of errors during playback. This is displayed in hexadecimal from 00 to FF.

Displays the total number of errors Displays “total xx”. This is displayed in hexadecimal from 00 to FF.

Displays the past ten errors. Displays “0x ErrCd@@”. X is the history number. The younger the number, the more recent is the history (00 is the latest). @@ is the error code. Select the error history number using the AMS knob.

Displays the past five retry addresses. Displays “xx ADRS yyyy”, xx is the history number, yyyy is the cluster with the retry error. Select the error history number using the AMS knob.

er refresh

op change

spdl change

Mode for erasing the error and retry address histories Procedure

1. Press the AMS knob when displayed as “er refresh”.

2. Press the YES button when the display changes to “er refresh?”. When “complete!” is displayed, it means erasure has completed. Be sure to check the following after executing this mode. *Data has been erased. *Perform recording and playback, and check that the mechanism is normal.

Mode for erasing the total time of op rec tm, op play tm. These histories are based on the time of replacement of the optical pickup. If the optical pick-up has been replaced, perform this procedure and erase the history. Procedure

1. Press the AMS knob when displayed as “op change”.

2. Press the YES button when the display changes to “op change?”. When “Complete!” is displayed, it means erasure has completed.

Mode for erasing the total spdl rp tm time These histories are based on the time of replacement of the spindle motor. If the spindle motor has been replaced, perform this procedure and erase the history. Procedure

1. Press the AMS knob when displayed as “spdl change”

2. Press the YES button when the display changes to “spdl change?” When “Complete!” is displayed, it means erasure has completed.

Table of Error Codes

Error Code

Could not load

Loading switches combined incorrectly

Timed out without reading the top of PTOC

Could read top of PTOC, but detected error

Timed out without accessing UTOC

Timed out without reading UTOC

Error in UTOC

Could not start playback

Error in sector

Retry cause generated during normal recording

Retried in DRAM overflow

Retry occurred during TOC writing

Retry aborted during S.F editing

Other than access processing, and could not read address.

Focus NG occurred and overran.

MODEL IDENTIFICATION

— BACK PANEL —

MODEL

AEP, UK, CIS models US model CND model SP, MY models HK model AUS model

• Abbreviation CND : Canadian model SP : Singapore model MY : Malaysia model HK : Hong Kong model AUS : Australian model

Description

Part No.

PARTS No.

4-228-639-0s 4-228-639-1s 4-228-639-2s 4-228-639-3s 4-228-639-4s 4-228-639-5s

TABLE OF CONTENTS

1. SERVICING NOTES ............................................. 5

2. GENERAL ........................................................................ 11

3. DISASSEMBLY

3-1. Upper Case (408226) .......................................................... 12

3-2. Front Panel Section ............................................................. 12

3-3. Main Board ......................................................................... 13

3-4. PT Board, VOL-SEL Board ................................................ 13

3-5. Mechanism Deck Section (MDM-7A) ................................ 14

3-6. BD Board ............................................................................ 14

4. TEST MODE ..................................................................... 15

5. ELECTRICAL ADJUSTMENTS ............................... 20

6. DIAGRAMS

6-1. Circuit Boards Location ...................................................... 31

6-2. Block Diagrams

• BD Section ....................................................................... 32

• Main Section .................................................................... 33

6-3. Printed Wiring Board – BD Section – ................................. 35

6-4. Schematic Diagram – BD Section (1/2) – ........................... 36

6-5. Schematic Diagram – BD Section (2/2) – ........................... 37

6-6. Printed Wiring Board – Main Section (Side A) – ............... 38

6-7. Printed Wiring Board – Main Section (Side B) – ............... 39

6-8. Schematic Diagram – Main Section (1/3) – ........................ 40

6-9. Schematic Diagram – Main Section (2/3) – ........................ 41

6-10. Schematic Diagram – Main Section (1/3) – ..................... 42

6-11. Printed Wiring Board – Power Section – ......................... 43

6-12. Printed Wiring Board – Display Section – ....................... 44

6-13. Schematic Diagram – Display Section – .......................... 45

6-14. IC Block Diagrams ........................................................... 46

6-15. IC Pin Functions ............................................................... 48

7. EXPLODED VIEWS

7-1. Chassis Section ................................................................... 54

7-2. Front Panel Section ............................................................. 55

7-3. Mechanism Section-1 (MDM-7A) ...................................... 56

7-4. Mechanism Section-2 (MDM-7A) ...................................... 57

8. ELECTRICAL PARTS LIST ........................................ 58

SECTION 1

SERVICE NOTES

SAFETY CHECK-OUT

(US model only)

After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

LEAKAGE

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

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.

Laser component in this product is capable of emitting radiation exceeding the limit for Class 1.

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

This caution label is located inside the unit.

0.15µF

1.5kΩ

Earth Ground

AC voltmeter (0.75V)

Fig. A. Using an AC voltmeter to check AC leakage.

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 .

CAUTION

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

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 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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS P AR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMA TIQUES 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.

JIG FOR CHECKING BD BOARD WAVEFORM

The special jig (J-2501-196-A) is useful for checking the waveform of the BD board. The names of terminals and the checking items to be performed are shown as follows.

GND : Ground I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser) IOP : For measuring IOP (Check the deterioration of the optical pick-up laser) TE : TRK error signal (Traverse adjustment) VC : Reference level for checking the signal RF : RF signal (Check jitter) FE : Focus error signal

I+3V

GND

IOP

I+3V

IOP

GND

FE VC RF

CN105

I+3V Iop GND TE FE VC RF

for

MDM-7A

Iop DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC195 OF BD BOARD) ARE REPLACED

The Iop value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC195 of BD board), record the Iop value on the optical pick-up according to the following procedure.

Record Precedure:

1. While pressing the l AMS L knob and x button, connect the power plug to the outlet, and release the l AMS L knob and x button.

2. Rotate the l AMS L knob to display “[Service]”, and press the YES button.

3. Rotate the l AMS L knob to display “Iop Write” (C05), and press the YES button.

4. The display becomes “Ref=@@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.

5. Input the Iop value written on the optical pick-up. To select the number : Rotate the l AMS L knob. To select the digit : Press the l AMS L knob.

6. When the YES button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).

7. As the adjustment results are recorded for the 6 value. Leave it as it is and press the YES button.

8. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop Write”.

9. Press the REPEAT button to complete.

Display Precedure:

1. While pressing the l AMS L knob and x button, connect the power plug to the outlet, and release the l AMS L knob and x button.

2. Rotate the l AMS L knob to display “[Service]”, and press the YES button.

3. Rotate the l AMS L knob to display “Iop Read” (C26).

4. “@@.@/##.#” is displayed and the recorded contents are displayed. @@.@ : indicates the Iop value labeled on the optical pick-up. ##.# : indicates the Iop value after adjustment

5. To end, press the l AMS L button or MENU/NO button to display “Iop Read”. Then press the REPEAT button.

CHECKS PRIOR TO PARTS REPLACEMENT AND ADJUSTMENTS

Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent. Details of the procedures are described in “5 Electrical Adjustments”.

• 5-6-2. Laser power check (see page 23)

• 5-6-3. Iop Compare (see page 23)

• 5-6-4. Auto Check (see page 24)

Note:

The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments. When performing adjustments, use the specified values for adjustments.

FORCED RESET

The system microprocessor can be reset in the following procedure. Use these procedure when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.

Procedure :

Remove the short-pin attached to CN420, and then attach it again.

[MAIN BOARD] (Component Side)

CN420

RETRY CAUSE DISPLAY MODE

• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent indicator tube. During playback, the

“track mode” for obtaining track information will be set. This is useful for locating the faulty part of the unit.

• The following will be displayed :

During recording and stop : Retry cause, number of retries, and number of retry errors. During playback : Information such as type of disc played, part played, copyright. These are displayed in hexadecimal.

Procedure:

1. Procedure 1: Press the x button continuously for about 10 seconds. Procedure 2: Press the LEVEL/DISPLAY/CHAR button while pressing the x button and MENU/NO button.

2. When the mode is set, “RTs 00c 00e 000” is displayed.

3. Press the z REC button to start recording. Then press the X button and start recording.

4. To check the “track mode”, press the H button to start play.

5. To exit the test mode, press the @/1 button, and turn OFF the power. When “TOC” disappears, disconnect the power plug from the outlet. If the test mode cannot be exited, refer to “Forced Reset” on page 8.

Fig. 1 Reading the Test Mode Display (During recording and stop)

RTs@@c##c***

Fluorescent display tube display

@@ : Cause of retry ## : Number of retries *** : Number of retry errors

Reading the Retry Cause Display

Higher Bits Lower Bits

Hexadecimal

Bit

Binary

84218421

b7 b6 b5 b4 b3 b2 b1 b0

00000001

00000010

00000100

00001000

00010000

00100000

01000000

10000000

Hexa-

decimal

Fig. 2 Reading the Test Mode Display (During playback)

@@####**$$

Fluorescent display tube display

@@ : Parts No. (name of area named on TOC) ## : Cluster ** : Sector $$ : Track mode (Track information such as copyright infor-

Cause of Retry Occurring conditions

shock

ader5

Discontinuous address

DIN unlock

FCS incorrect

IVR rec error

CLV unlock

Access fault

} Address (Physical address on disc)

mation of each part)

When track jump (shock) is detected

When ADER was counted more than five times continu-

ously

When ADIP address is not continuous

When DIN unlock is detected

When not in focus

When ABCD signal level exceeds the specified range

When CLV is unlocked

When access operation is not performed normally

Reading the Display:

Convert the hexadecimal display into binary display. If more than two causes, they will be added.

Example

When 42 is displayed: Higher bit : 4 = 0100 t b6 Lower bit : 2 = 0010 t b1 In this case, the retry cause is combined of “CLV unlock” and “ader5”.

When A2 is displayed: Higher bit : A = 1010 t b7+b5 Lower bit : 2 = 0010 t b2 The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.

Reading the Track Mode Display

Higher Bits Lower Bits

Hexadecimal

Bit

Binary

Reading the Display:

Convert the hexadecimal display into binary display. If more than two causes, they will be added.

Example When 84 is displayed:

Higher bit : 8 = 1000 t b7 Lower bit : 4 = 0100 t b2 In this case, as b2 and b7 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis OFF”, “monaural”, “original”, “copyright exists”, and “write allowed”.

Example When 07 is displayed:

Higher bit : 0 = 1000 t All 0 Lower bit : 7 = 0111 t b0+b1+b2 In this case, as b0, b1, and b2 are 1 and others are 0, it can be determined that the retry cause is combined of “emphasis ON”, “stereo”, “original”, “copyright exists”, and “write prohibited”.

84218421

b7 b6 b5 b4 b3 b2 b1 b0

00000001

00000010

00000100

00001000

00010000

00100000

01000000

10000000

Hexa-

decimal

When 0 When 1

Emphasis OFF

Monaural

This is 2-bit display. Normally 01.

01:Normal audio. Others:Invalid

Audio (Normal)

Original

Write prohibited

Details

Emphasis ON

Stereo

Invalid

Digital copy

No copyright

Write allowed

Hexadecimal t Binary Conversion Table

Hexadecimal Binary Hexadecimal Binary

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

SECTION 2

qfqgqhq

GENERAL

1 STANDBY indicator 2 @/1 (power) button 3 SCROLL button 4 MDLP indicator 5 A EJECT button 6 MENU/NO button 7 YES button 8 H button 9 S button q; s button

3 4 5 6 7 8 9 0 qa

;

qa z REC button qs REC MODE button qd INPUT button qf LEVEL/DISPLAY/CHAR button qg J button qh REPEAT button qj PLAY MODE button qk j button ql l AMS L /PUSH ENTER button w; CLEAR button

qs qd

SECTION 3

)

DISASSEMBLY

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

3-1. UPPER CASE (408226)

1 two screws

(CASE 3 TP2)

2 case (408226)

1 two screws

(CASE 3 TP2

3-2. FRONT PANEL SECTION

1 wire (flat type) (17core

(CN490)

3 claw

4 front panel section

2 five screws

(BVTP3 × 8)

3-3. MAIN BOARD

6 screw

(BVTP3 × 8)

3 connector

(CN902)

2 wire (flat type) (23core)

(CN400)

1 wire (flat type) (27core)

(CN1)

5 screw

(BVTP3 × 8)

7 MAIN board

4 two screws

(BVTP3 × 8)

3-4. PT BOARD, VOL-SEL BOARD

4 PT board

1 connector

(CN900)

6 VOL-SEL board

(MY, SP model)

3 two screws

(PTTWH (M3))

2 connector

(CN951)

5 two screws (BVTP3 × 8)

(MY, SP model)

3-5. MECHANISM DECK SECTION (MDM-7A)

2 four step screws

(BVTTWH M3)

4 mechanism deck

1 harness

3-6. BD BOARD

3 two screws

(BTP 2 × 6)

5 connector

(CN101)

4 BD board

1 connector

(CN104)

2 Remove the solder (Two portion)

M102

M101

M103

S102

2 Remove the solder (Three portion)

SECTION 4

TEST MODE

4-1. PRECAUTIONS FOR USE OF TEST MODE

• As loading related operations will be performed regardless of the test mode operations being performed, be sure to check that the disc

is stopped before setting and removing it. Even if the A EJECT button is pressed while the disc is rotating during continuous playback, continuous recording, etc., the disc will not stop rotating. Therefore, it will be ejected while rotating. Be sure to press the A EJECT button after pressing the MENU/NO button and the rotation of disc is stopped.

4-1-1. Recording laser emission mode and operating buttons

• Continuous recording mode (CREC 1MODE)

• Laser power check mode (LDPWR CHECK)

• Laser power adjustment mode (LDPWR ADJUS)

• Iop check (Iop Compare)

• Iop value nonvolatile writing (Iop NV Save)

• Traverse (MO) check (EF MO CHECK)

• Traverse (MO) adjustment (EF MO ADJUS)

• When pressing the z REC button.

4-2. SETTING THE TEST MODE

The following are two methods of entering the test mode. Procedure 1: While pressing the AMS knob and x button, connect the power plug to an outlet, and release the AMS knob and x button.

When the test mode is set, “[Check]” will be displayed. Rotating the AMS knob switches between the following three groups;

··· y Check y Service y Develop y ···.

Procedure 2: While pressing the AMS knob, connect the power plug to the outlet and release the AMS knob.

When the test mode is set, “TEMP CHECK” will be displayed. By setting the test mode using this method, only the “Check” group of method 1 can be executed.

NOTE: Do not use the test mode in the [Develop] group.

If used, the unit may not operate normally. If the [Develop] group is set accidentally, press the MENU/NO button immediately to exit the [Develop] group.

4-3. EXITING THE TEST MODE

Press the REPEAT button. The disc is ejected when loaded, and “Standby” display blinks, and the STANDBY state is set.

4-4. BASIC OPERATIONS OF THE TEST MODE

All operations are performed using the AMS knob, YES button, and MENU/NO button. The functions of these buttons are as follows.

Function name

MENU/NO button

YES button

Left or Right

AMS knob

Push

Cancel or move to top hierarchy

Set

Select

Set submenu

Function

4-5. SELECTING THE TEST MODE

There are 25 types of test modes as shown below. The groups can be switched by rotating the AMS knob. After selecting the group to be used, press the YES button. After setting a certain group, rotating the AMS knob switches between these modes. Refer to “Group” in the table for details selected. All adjustments and checks during servicing can be performed in the test mode in the Service group.

NOTE: Do not use the test mode in the [Develop] group.

If used, the unit may not operate normally. If the [Develop] group is set accidentally, press the MENU/NO button immediately to exit the [Develop] group.

Display

AUTO CHECK

Err Display

TEMP ADJUS

LDPWR ADJUS

Iop Write

Iop NV Save

EF MO ADJUS

EF CD ADJUS

FBIAS ADJUS

AG Set (MO)

AG Set (CD)

TEMP CHECK

LDPWR CHECK

EF MO CHECK

EF CD CHECK

FBIAS CHECK

ScurveCHECK

VERIFYMODE

DETRK CHECK

0920 CHECK

Iop Read

Iop Compare

ADJ CLEAR

INFORMATION

CPLAY1MODE

CREC 1MODE

No.

Automatic self-diagnosis

C01

Error history display, clear

C02

Temperature compensation offset adjustment

C03

Laser power adjustment

C04

Iop data writing

C05

Writes current Iop value in read nonvolatile memory using microprocessor

C06

Traverse (MO) adjustment

C07

Traverse (CD) adjustment

C08

Focus bias adjustment

C09

Focus, tracking gain adjustment (MO)

C10

Focus, tracking gain adjustment (CD)

C11

Temperature compensation offset check

C12

Laser power check

C13

Traverse (MO) check

C14

Traverse (CD) check

C15

Focus bias check

C16

S-curve check

C17

Nonvolatile memory check

C18

Detrack check

C19

Most circumference check

C25

Iop data display

C26

Comparison with initial Iop value written in nonvolatile memory

C27

Initialization of nonvolatile memory for adjustment values

C28

Display of microprocessor version, etc.

C31

Continuous playback mode

C34

Continuous recording mode

C35

Details

Mark

Group

Check Service

• For details of each adjustment mode, refer to “5. Electrical Adjustments”. For details of “Err Display”, refer to “Self-Diagnosis Function” on page 2.

• If a different mode has been selected by mistake, press the MENU/NO button to exit that mode.

• Modes with (X) in the Mark column are not used for servicing and therefore are not described in detail. If these modes are set acciden-

tally, press the MENU/NO button to exit the mode immediately.

4-5-1. Operating the Continuous Playback Mode

1. Entering the continuous playback mode

1 Set the disc in the unit. (Whichever recordable discs or discs for playback only are available.) 2 Rotate the AMS knob and display “CPLAY1 MODE”(C34). 3 Press the YES button to change the display to “CPLAY1 MID”. 4 When access completes, the display changes to “C = AD = ”.

Note : The numbers “ ” displayed show you error rates and ADER.

2. Changing the parts to be played back

1 Press the YES button during continuous playback to change the display as below.

“CPLAY1 MID” t “CPLAY1 OUT” t “CPLAY1 IN”

When pressed another time, the parts to be played back can be moved.

2 When access completes, the display changes to “C = AD = ”. Note : The numbers “ ” displayed show you error rates and ADER.

3. Ending the continuous playback mode

1 Press the MENU/NO button. The display will change to “CPLAY1 MODE”(C34). 2 Press the AEJECT button to remove the disc.

Note : The playback start addresses for IN, MID, and OUT are as follows.

IN 40h cluster MID 300h cluster OUT 700h cluster

4-5-2. Operating the Continuous Recording Mode (Use only when performing self-recording/palyback check.)

1. Entering the continuous recording mode

1 Set a recordable disc in the unit. 2 Rotate the AMS knob and display “CREC1 MODE” (C35). 3 Press the YES button to change the display to “CREC1 MID”. 4 When access completes, the display changes to “CREC1 ( )” and REC lights up.

Note : The numbers “ ” displayed shows you the recording position addresses.

2. Changing the parts to be recorded

1 When the YES button is pressed during continuous recording, the display changes as below.

“CREC1 MID” t “CREC1 OUT” t “CREC1 IN”

When pressed another time, the parts to be recorded can be changed. REC goes off.

2 When access completes, the display changes to “CREC1 ( Note : The numbers “ ” displayed shows you the recording position addresses.

3. Ending the continuous recording mode

1 Press the MENU/NO button. The display changes to “CREC1 MODE” (C35) and REC goes off. 2 Press the A button to remove the disc.

Note 1 : The recording start addresses for IN, MID, and OUT are as follows.

IN 40h cluster MID 300h cluster OUT 700h cluster

Note 2 : The MENU/NO button can be used to stop recording anytime. Note 3 : Do not perform continuous recording for long periods of time above 5 minutes. Note 4 : During continuous recording, be careful not to apply vibration.

)” and REC lights up.

4-6. FUNCTIONS OF OTHER BUTTONS

Function

REC MODE

PLAY MODE

LEVEL/DISPLAY/CHAR

REPEAT

Sets continuous playback when pressed in the STOP state. When pressed during continuous

playback, the tracking servo turns ON/OFF.

Stops continuous playback and continuous recording.

The sled moves to the outer circumference only when this is pressed.

The sled moves to the inner circumference only when this is pressed.

Switches between the pit and groove modes when pressed.

Switches the spindle servo mode (CLV S y CLV A).

Switches the displayed contents each time the button is pressed.

Ejects the disc.

Exits the test mode.

Contents

4-7. TEST MODE DISPLAYS

Each time the LEVEL/DISPLAY/CHAR button is pressed, the display changes in the following order. When CPLAY and CREC are started, the display will forcibly be switched to the error rate display as the initial mode.

1. Mode display

Displays “TEMP ADJUST”, “CPLAY1MODE”, etc.

2. Error rate display

Displays the error rate in the following way.

C1 = AD = C1 = Indicates the C1 error. AD = Indicates ADER.

3. Address display

The address is displayed as follows. (MO:recordable disc, CD:playback only disc) If the LEVEL/DISPLAY/CHAR button is pressed after pressing the PROGRAM button, the display switches from groove to pit or vice versa. h = s = (MO pit and CD) h = a = (MO groove) h = Indicates the header address. s = Indicates the SUBQ address. a = Indicates the ADIP address.

Note: “–” is displayed when the address cannnot be read.

Auto gain display (Not used in servicing)

Detrack check display (Not used in servicing)

IVR display (Not used in servicing)

Mode display

Error rate display

Address display

C1 error and Jitter display

(Not used in servicing)

AD error and Jitter display

(Not used in servicing)

4-8. MEANINGS OF OTHER DISPLAYS

Display

REC

SYNC

L.SYNC

OVER

B/1

A-/REP

TRACK/(LP) 4/Calendar frame

DISC/LP2

SLEEP/SHUF

MONO

When Lit When Off

Servo ON

Tracking servo OFF

Recording mode ON

CLV low speed mode

ABCD adjustment completed

Tracking offset cancel ON

Tracking auto gain OK

Focus auto gain OK

Pit

High reflection

CLV S

CLV LOCK

Contents

Servo OFF

Tracking servo ON

Recording mode OFF

CLV normal mode

Tracking offset cancel OFF

Groove

Low reflection

CLV A

CLV UNLOCK

4-9. AUTOMATIC SELF-DIAGNOSIS FUNCTION

This test mode performs CREC and CPLAY automatically for mainly checking the characteristics of the optical pick-up. To perform this test mode, the laser power must first be checked. Perform AUTO CHECK after the laser power check and Iop check.

Procedure

1. Press the YES button. If “LDPWR ” is displayed, it means that the laser power check has not been performed. In this case, perform the laser power check and Iop compare, and then repeat from step 1.

2. If a disc is in the mechanical deck, it will be ejected forcibly. “DISC IN” will be displayed in this case. Load a test disc (MDW-74/GA-1) which can be recorded.

3. If a disk is loaded at step 2, the check will start automatically.

4. When “XX CHECK” is displayed, the item corresponding to XX will be performed. When “06 CHECK” completes, the disc loaded at step 2 will be ejected. “DISC IN” will be displayed. Load the check disc (MD) TDYS-1.

5. When the disc is loaded in step 4, the check will automatically be resumed from “07 CHECK”.

6. After completing to test item 12, check OK or NG will be displayed. If all items are OK, “CHECK ALL OK” will be displayed. If any item is NG, it will be displayed as “NG:xxxx”.

When “CHECK ALL OK” is displayed, it means that the optical pick-up is normal. Check the operations of the other spindle motor, thread motor, etc. When displayed as “NG:xxxx”, it means that the optical pick-up is faulty. In this case, replace the optical pick-up.

4-10. INFORMATION

Display the software version.

Procedure

1. If displayed as “INFORMATION”, press the YES button.

2. The software version will be displayed.

3. Press the MENW/NO button to end this mode.

4-11. WHEN MEMORY NG IS DISPLAYED

If the nonvolatile memory data is abnormal, “E001”/”MEMORY NG” will be displayed so that the MD deck does not continue operations. In this case, set the test mode promptly and perform the following procedure.

Procedure

1. Set the test mode. (Refer to 4-2.)

2. Normally a message for selecting the test mode will be displayed. However if the nonvolatile memory is abnormal, the following will be displayed. “INIT EEP?”

3. Press the STOP button and EJECT button together.

4. Rotate the AMS knob and select MDM-7A.

5. Press the AMS knob. If the nonvolatile memory is successfully overwritten, the normal test mode will be set and a message to select the test mode will be displayed.

SECTION 5

ELECTRICAL ADJUSTMENTS

5-1. PARTS REPLACEMENT AND ADJUSTMENT

If malfunctions caused by Optical pick-up such as sound skipping are suspected, follow the following check.

Check before replacement

Start

5-6-2.

Laser Power Check

(See page 23)

5-6-3.

Iop Compare (See page 23)

5-6-4.

Auto Check

(See page 24)

Other faults are suspected. Check the threading mechanism, etc.

Replace Optical pick-up or MDM-7A

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