Sharp MDSR-50, MDSR-50-H, MDSR-50-W, MDSR-60, MDSR-60-E Service manual

...

Illustration: MD-SR50H/SR50W

MD-SR50H/50W/60E/60W

SERVICE MANUAL

No. S2006MDSR50H/

MD-SR50H(BL) MD-SR50H(S) MD-SR50H(YR) MD-SR50W(BL) MD-SR50W(S) MD-SR60E(GL) MD-SR60W(S)

• In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used.

Illustration: MD-SR60E/SR60W

CONTENTS

SAFETY PRECAUTION FOR SERVICE MANUAL ............................................................................................................... 2

SPECIFICATIONS ................................................................................................................................................................. 3

NAMES OF PARTS ............................................................................................................................................................... 4

OPERATION MANUAL .......................................................................................................................................................... 5

DISASSEMBLY...................................................................................................................................................................... 8

REMOVING AND REINSTALLING THE MAIN PARTS......................................................................................................... 9

ADJUSTMENT ...................................................................................................................................................................... 10

NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 23

TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 23

VOLTAGE ............................................................................................................................................................................ 24

BLOCK DIAGRAM ............................................................................................................................................................... 25

SCHEMATIC DIAGRAM ...................................................................................................................................................... 26

WIRING SIDE OF P.W.BOARD........................................................................................................................................... 28

WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 31

TROUBLESHOOTING ......................................................................................................................................................... 32

FUNCTION TABLE OF IC.................................................................................................................................................... 35

PARTS GUIDE/EXPLODED VIEW PACKING METHOD (MD-SR50H for U.K./SR60E Only)

Page

SHARP CORPORATION

– 1 –

This document has been published to be used for after sales service only. The contents are subject to change without notice.

MD-SR50H/50W/60E/60W

SAFETY PRECAUTION FOR SERVICE MANUAL

Precaution to be taken when replacing and servicing the Laser Pickup.

The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements. However, the following precautions must be observed during servicing to protect your eyes against exposure to the laser beam.

(1) When the cabinet has been removed, the power is turned on without a compact disc, and the Pickup is on a position

outer than the lead-in position, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens.

(2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior

to shipping. (3) No adjustment to the Laser Power should be attempted when replacing or servicing the Pickup. (4) Under no circumstances look directly into the Pickup Lens at any time. (5) CAUTION - Use of controls or adjustments, or performance of procedures other than those specified herein may result

in hazardous radiation exposure.

CAUTION

LASER KLASSE 1 LUOKAN 1 LASERLAITE

● This Portable MiniDisc Recorder is classified as a CLASS 1 LASER product.

● The CLASS 1 LASER PRODUCT label is located on the bottom.

●

Use the Portable MiniDisc Recorder only in accordance with the instructions given in this manual and do not attempt to interfere with the interlock switch or make any other adjustment as this may result in exposure to hazardous radiation.

(MD-SR50H/SR60E)

KLASS 1 LASERAPP ARAT

Laser Diode Properties

● Material: GaAlAs

● Wavelength: 785 nm

● Pulse time:

Read mode: 0.8 mW Continuous Write mode: max 10 mW 0.5S min cycle 1.5S Repetition

Laser Diode Properties

● Material: GaAIAs

● Wavelength: 785 nm

● Pulse time:

Read mode; 0.8 mW Continuous Write mode; max. 10 mW 0.5S

min. cycle 1.5S

Repetition

(MD-SR50W/SR60W)

VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA KUIN TÄSSÄ KÄYTTÖOHJEESSA MAINITULLA TAVALLA SAATTAA ALTISTAA KÄYTTÄJÄN TURVALLISUUSLUOKAN 1 YLITTÄVÄLLE NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE.

VARNING - OM APPARATEN ANVÄNDS PÅ ANNAT SÄTT ÄN I DENNA BRUKSANVISNING SPECIFICERAS. KAN ANVÄNDAREN UTSÄTTAS FÖR OSYNLIG LASERSTRÅLNING, SOM ÖVERSKRIDER GRÄNSEN FÖR LASERKLASS 1.

(MD-SR50H)

VARO ! Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen. VARNING! Osynlig laserstralning när denna del är öppnad och spärren är urkopplad. Betrakta ej strälen.

Precaution to be taken when replacing and servicing the laser pickup. The following precautions must be observed during servicing to protect your eyes against exposure to the laser.

Warning of possible eye damage when repairing: If the AC adaptor or batteries are connected when the top houising (disc cover) of the unit is removed, and the PLAY key is pressed, the laser will light up during focus access (2-3 seconds). (Fig. 2-1) During the operation, the laser will leak from the opening between the magnetic head and the mechanical chassis (Fig. 2-2). In order to protect your eyes, you must not look at the laser during repair. Before repairing be sure to disconnect the AC adaptor and remove the batteries.

Magnet head

Mechanism Chassis

Optical pick-up

Top Cabinet

Spindle motor

Figure 2-1 Figure 2-2

– 2 –

Magnet Head

Main PWB

Laser Beam

Optical Pick-Up

MD-SR50H/50W/60E/60W

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.

SPECIFICATIONS

General

Power source:

(MD-SR50H)

DC 5V : AC adaptor (AC 220-230V, 50/60 Hz) DC 1.5V: Commercially available,

"AA" (LR6)

size, alkaline battery x 1

DC 1.2V: Optional rechargeable Nickel-Metal

Hydride battery (AD-N70BT) x 1

DC 4.5V: Optional car adaptor, AD-CA20X

(for cars with a 12-24V DC negative earth electrical system)

Power source:

(MD-SR50W)

DC 5V : AC adaptor (AC 110-240V, 50/60 Hz) DC 1.5V: Commercially available,

"AA" size

(LR6), alkaline battery x 1

DC 1.2V: Optional rechargeable Nickel-Metal

Hydride battery (AD-N70BT) x 1

DC 4.5V: Separately available car adaptor,

AD-CA20X (for cars with a 12-24V DC negative earth electrical system)

Power source: DC 1.2V: Rechargeable Nickel-Metal Hydride

(MD-SR60E)

battery (AD-N70BT) x 1 DC 5V : AC adaptor (AC 230-240V, 50/60 Hz) DC 1.5V: Commercially available,

"AA" size

(LR6), alkaline battery x 1 DC 4.5V: Separately available car adaptor,

AD-CA20X (for cars with a 12-24V

DC negative earth electrical system)

Power source: DC 1.2V: Rechargeable Nickel-Metal Hydride (MD-SR60W)

battery (AD-N70BT) x 1 DC 5V : AC adaptor (AC 220V, 50 Hz) DC 1.5V: Commercially available,

"AA" size

(LR6), alkaline battery x 1 DC 4.5V: Separately available car adaptor,

AD-CA20X (for cars with a 12-24V

DC negative earth electrical system)

Power consumption:

7W (AC adaptor)

(MD-SR50H/60E) Power consumption:

0.15A (AC adaptor)

(MD-SR50W) Power consumption:

6W, 0.06A (AC adaptor)

(MD-SR60W) Output power: RMS; 20 mW (10 mW + 10 mW) (0.2 % T.H.D.) Charging time: Approx. 3.5 hours (90%)

Approx. 5.5 hours

(fully charged)

(When using the AC adaptor included with the unit)

Battery life:

When using a high capacity, "AA" (LR6) size, alkaline battery

Battery life:

When using a high capacity, "AA" size (LR6), alkaline battery

(MD-SR50H/SR50W)

commercially available,

Continuous recording

Approx. 3 hours Continuous play

Approx. 7 hours

(MD-SR60W/SR60E)

commercially available,

Continuous recording

Approx. 3 hours Continuous play

Approx. 7 hours

When using the optional rechargeable batter AD-N70BT(full charged)

Continuous recording

Approx. 4.5 hours

Continuous play

Approx. 6.5 hours

When using the rechargeable batter (full charged) included with the unit

Continuous recording

Approx. 4.5 hours

Continuous play

Approx. 6.5 hours

The continuous recording time is for analogue input when the volume level is set to "VOL 0" The continuous play time shows the value when the volume level is set to "VOL 15" The above values are the standard values when the unit is charged and used at an ambient temperature of 20˚C (68˚F).

The operation time when using an alkaline battery may be different, depending on the type and manufacturer of the battery and on the operating temperature.

Input sensitivity:

Recording

level

Reference input level

input

impedance

MIC H 0.25 mV 10 kohms

MIC L 2.5 mV 10 kohms

LINE 100 mV 20 kohms

Output level:

(MD-SR50H/SR50W)

Specified

output

Maximum

output level

Load

impedance

Earphones — 10 mW + 10 mW 32 ohms LINE 250 mV (-12 dB) — 10 kohms

Output level:

(MD-SR60W/SR60E)

Specified

output

Maximum

output level

Load

impedance

Headphones — 10 mW + 10 mW 16 ohms LINE 250 mV (-12 dB) — 10 kohms

Dimensions: Width: 99.9 mm (3-15/16")

Height: 22.9 mm (29/32") Depth: 77.9 mm (3-3/32")

Weight: 168 g (0.37 lbs.) without battery (

MD-

SR50H/SR50W)

Weight: 191 g (0.42 lbs.) with rechargeable (

MD-

SR60W/SR60E) battery

Input socket: Line/optical digital, microphone

(powered by the main unit)

Output socket: Earphones (impedance: 32 ohms) (

MD-

SR50H/SR50W)

Output socket: Headphones (impedance: 16 ohms)/ (

MD-

SR60W/SR60E) remote control unit

MiniDisc Recorder

Type: Portable MiniDisc recorder Signal readout: Non-contact, 3-beam semi-conductor

Audio channels: Stereo 2 channels/monaural (longplay Frequency response: 20 - 20,000 Hz (± 3 dB)

Rotation speed: Approx. 400 - 900 rpm Error correction: ACIRC (Advanced Cross Interleave

Coding: ATRAC (Adaptive Transform

Recording method: Magnetic modulation overwrite Sampling frequency: 44.1kHz (32 kHz and 48kHz signals

Wow and flutter: Unmeasurable

Specifications for this model are subject to change without prior notice

laser pick-up mode) 1 channel

Reed-Solomon Code) Acoustic Coding), 24-bit computed

type method are converted to 44.1kHz, and then

recorded)

(less than ±0.001% W. peek)

– 3 –

MD-SR50H/50W/60E/60W

NAMES OF PARTS

■ Remote control unit

1. Monaural Long-Play Mode Indicator

2. Record Indicator

3. Level Meter

4. Fast Play Indicator

5. Repeat Indicator

6. TOC Indicator

7. Battery Indicator

8. Random Indicator

9. Track Number Indicator

10. Character/Time Information Indicator

11. Synchro Recording Indicator

12. Disc Mode Indicator

13. Disc Name Indicator

14. Track Name Indicator

15. Remaining Recording Time Indicator

16. Total Track Number Indicator

17. Volume Down/Cursor Button

18. Volume Up/Cursor Button

19. Record/Track Mark Button

20. Stop/Power Off/Charge Button

21. Play/Pause Button

22. Display/Character Select Button

23. Edit/Auto Mark/Time Mark Button

24. Mode Button

25. Bass/Delete Button

26. Fast Reverse/Recording Level Down/ Name Select Button

27. Fast Forward/Recording Level Up/ Name Select Button

28. Enter/Fast Play/Synchro Button

29 30

11 12

13 14

123456

15 16

7 8

9 10

27262524

29. Earphones/Line Output Socket

30. Optical/Line Input Socket

31. Microphone Input Socket

32. Open Lever

33. 5V DC Input Socket

34. Battery Cover

35. Hold Switch

■ Remote control unit

1. Headphones Socket

2. Bass/Delete/Track Mark Button

3. Volume Down/Cursor Button

4. Volume Up/Cursor Button

5. Hold Switch

6. Play/Pause Button

7. Fast Reverse/Recording Level Down/ Name Select Button

8. Fast Forward/Recording Level Up/ Name Select Button

9. Sto

/Power Off Button

33 34

Illustration: MD-SR60E/SR60W Only

– 4 –

OPERATION MANUAL

POWER SOURCE

You can power this unit with an AC adaptor or a commercially available alkaline bat-

tery (LR6, “AA” size).

You can also power this unit with a rechargeable battery (AD-N70BT) or car adaptor

(AD-CA20X) which are available separately.

For MD-SR50H AC 220-230V, 50/60 Hz

For MD-SR50W AC 110-240V, 50/60 Hz

For MD-SR60E AC 230-240V, 50/60Hz

For MD-SR60W AC 220V, 50 Hz

Insert securely

all the way in.

To the DC

IN 5V socket

■ Rechargeable battery power

When the rechargeable battery is used for the

first time or when you want to use it after a

long period of disuse, be sure to charge it fully.

Open the battery cover.

● Slide the battery cover as far as it will go

to the outside and then lift to open it.

If the battery cover is lifted without be-

ing slid all the way out, it may break.

Insert the rechargeable battery accord-

ing to the polarity marked on the bottom

of the unit.

Close the battery cover.4Plug the AC adaptor into the AC socket,

and then insert the plug on the AC adap-

tor lead into the DC IN 5V socket.

Press the :OFF/CHRG ( • ■ ) button to

begin charging.

● “

” will appear, and the battery

will begin charging.

●After about 3.5 hours have

passed,

“ ” will go out.

This indicates that the battery charg-

ing is about 90% complete.

●

To charge the battery fully, continue

charging for about 2 more hours.

(In this case, you do not need to press

the :OFF/CHRG ( • ■ ) button. Even if

the :OFF/CHRG ( • ■ ) button is

pressed, “

” will not appear.)

Notes:

● After charging has been completed, the

AC adaptor may be left connected.

(For example, when charging at night.)

● The battery will not be charged when the

power to the main unit is turned on.

●

Do not force the battery cover open too far.●Do not use a rechargeable battery or an

AC adaptor other than those specified.

● The charging time will vary, depending

on the condition of the battery.

● When the battery is charged for the first

time or is charged after not being used

for a long period, the operating time may

be shorter than normal.The battery life

will recover with normal use i.e. charg-

ing and discharging.

● T o av oid shortening the service life of the

battery only recharge the battery after it

has been completely discharged.

RECORDING USING THE OPTICAL DIGITAL CABLE

This is the method used for recording digi-

tal signals from CDs or MDs exactly as they

are stored on the original. Compared to re-

cordings made from analogue inputs, digi-

tal recordings have extremely high-quality

sound.

■ Synchro recording

Connect the external equipment.

Insert a recordable MiniDisc, and then

press the REC button.

Put the equipment connected to this unit

into the playback stand-by mode.

Press the ENTER/SYNC button.

Start the playback on the equipment

connected to this unit.

■ Manual recording

Place the unit in the recording stand-by

mode. (Perform steps 1 - 3 in the “Syn-

chro recording” section.)

Press the button, and then start

playback on the equipment connected

to this unit.

● When recording from digital inputs, it is

not necessary to adjust the recording

level.

Notes:

● This unit incorporates a sampling rate

converter.

When this unit is connected to digital

equipment such as CS/BS tuners or DAT

tape recorders that use a different sam-

pling frequency (32 kHz or 48 kHz), re-

cordings can still be made. (The sam-

pling frequency of this unit is 44.1 kHz.)

● When making a digital recording from a

portable CD player (if the player has a

sound skip prevention function and this

function is turned on) the optical output

will drop out and digital recording will not

be possible. Be sure to turn the sound

skip prevention function off.

There are cases where digital recording

may be impossible.

In the following cases digital recording is

impossible, even if you are using digital

cables.

When you attempt to make a new digital

recording from a track that was digitally re-

corded on a MiniDisc.

● MiniDiscs are designed so that only first

generation digital copies can be made.

Further digital copies are prevented by

the SCMS (Serial Copy Management

System).

Playback

Digital cable

CD player, MD

player, etc.

Digitally recorded MiniDisc

Analogue recording is

possible.

Recording

Playback

Digital cable

Recording

MD player

MD-SR50H/50W/60E/60W

– 5 –

MD-SR50H/50W/60E/60W

CONVENIENT OPERATION OF THE UNIT

< How to read the battery indicator >

● When the battery is completely discharged,

the battery indicator will flash. Recharge the

battery or replace the alkaline battery with

a new one.

● When the battery has run completely out,

“BATT EMPTY” will appear. Then, the

power will be disconnected automatically.

Notes:

● If you use the battery which you stopped

charging halfway, “

” may appear . It

does not mean that the battery is com-

pletely charged.

● When using the unit with an alkaline bat-

tery or a rechargeable battery, the battery

indicator will not correctly display the remain-

ing capacity for approximately 10 seconds

after the power has been turned on.

● When the AC adaptor included with this unit

or a separately available car adaptor is

used, the battery indicator will not be shown.

● The number of bars shown in the battery

indicator may increase or decrease, de-

pending on the operation being performed.

This is normal.

■ To prevent the unit from being

operated by mistake

To avoid accidental operation of the unit,

use the hold function.

Move the HOLD switch to the safety posi-

tion (direction indicated by the arrow).

● When the unit is in the hold mode, press-

ing the buttons will have no affect.

● To cancel the hold mode, move the

HOLD switch away from the safety po-

sition (the opposite direction of the ar-

row).

Battery indicator

Since the battery level is very low, you

cannot start recording or editing.

When the battery

level is high

When the battery

level is very low

■ Checking the remaining amount

of battery level

The remaining amount of battery level is

shown by the battery indicator (

) dur-

ing operation.

If the hold function is active whilst the power

is turned off, the power cannot be turned

on by mistake and the battery will not be

accidentally drained.

Remote

control unit

Main

unit

Cannot be operated

from either the

remote control unit or

the main unit.

Can only be operated

from the main unit.

Can only be operated

from the remote

control unit.

Can be operated

from either the

remote control unit or

the main unit.

Hold

Cancel

Hold

Cancel

Hold

Cancel Cancel

For MD-SR60E/SR60W Only

TROUBLESHOOTING

■ Moisture condensation

In the following cases, condensation

may form inside the unit.

● Shortly after turning on a heater.

● When the unit is placed in a room where

there is excessive steam or moisture.

● When the unit is moved from a cool

place to a warm place.

When the unit has condensation inside,

the disc signals cannot be read, and the

unit may not function properly.

● If this happens, remove the disc.

The condensation should evaporate in

approximately 1 hour. The unit will then

function properly.

Many potential “problems” can be resolved by the owner without calling a service techni-

cian.

If something seems to be wrong with this product, check the following before calling your

authorised SHARP dealer or service centre.

■ If trouble occurs

When this product is subjected to strong

external interference (mechanical shock,

excessive static electricity, abnormal sup-

ply voltage due to lightning, etc.) or if it is

operated incorrectly, it may malfunction.

If such a problem occurs, do the following:

1. Unplug the AC adaptor from the AC

socket.

2. Remove the battery.

3. Leave the unit completely unpowered for

approximately 30 seconds.

4. Plug the AC adaptor back into the AC

socket and retry the operation.

If strange sounds, smell or smoke come out

of the unit or an object is dropped into the

unit, remove the AC adaptor from the AC

socket immediately and contact an

authorised SHARP service centre.

PROBLEM CAUSE

The unit does not turn

on.

● Is the AC adaptor disconnected?

● Is the battery exhausted?

● Is the unit in the hold mode?

● Has condensation formed inside the unit?

● Is the unit being influenced by mechanical shock or by

static electricity?

● Is the volume set too low?

● Is the earphones plugged in?

● Are you trying to play a MiniDisc with data on it instead

of a MiniDisc containing music?

● Is the unit in the hold mode?

● Is the battery exhausted?

● Is the unit being subjected to excessive vibration?

● Has the track number or character information been

written on the disc yet?

● Is the unit in the recording or editing mode?

● Is the MiniDisc protected against accidental erasure?

● Is the unit connected properly to the other equipment?

● Is the AC adaptor unplugged or did a power failure oc-

cur whilst recording or editing?

● Is the unit in the hold mode?

● Is an optical signal being output from the external equip-

ment?

Read the operation manual for the external equipment.

No sound is heard from

the earphones.

When the operation but-

tons are pressed, the

unit does not respond.

Some sounds are

skipped.

The MiniDisc cannot be

ejected.

Recording and editing

are impossible.

– 6 –

MD-SR50H/50W/60E/60W

When the number of tracks used reaches

the limit, regardless of the remaining re-

cording time, further recording will be

impossible.

(Maximum number of tracks: 255)

If a MiniDisc has been recorded or ed-

ited repeatedly or if a MiniDisc has

scratches on it, it may not be possible to

record the maximum number of tracks on

it.

If there are scratches on a disc, the unit

will automatically avoid recording in those

areas. The recording time will be reduced.

When the remaining recording time of a

disc is displayed, short tracks less than

12 seconds long may not be included in

the total.

For MiniDiscs on which repeated record-

ing and editing operations were per-

formed, the COMBINE function may not

work.

A cluster (about 2 seconds) is normally the

minimum unit of recording. So, even if a track

is less than 2 seconds long, it will use about

2 seconds of space on the disc.

Therefore, the time actually available for re-

cording may be less than the remaining time

displayed.

If there are scratches on discs, those sec-

tions will be automatically avoided (no record-

ing will be placed in those sections). There-

fore, the recording time will be reduced.

For MiniDiscs on which repeated record-

ing and editing were performed, some

sounds may be skipped whilst cueing and

reviewing.

If there are scratches or dust on a

MiniDisc, the track numbers following that

track will be increased by one.

MINIDISC SYSTEM LIMITATIONS

MiniDiscs are recorded using a different system than is used for cassette tapes or DAT

recordings. Therefore, the following conditions may be encountered, depending on how

the disc has been recorded or edited. These are due to system limitations, and should be

considered normal.

Even if the maximum recording

time of a MiniDisc has not been

reached, “DISC FULL” or “TOC

FULL” may be displayed.

Even if the number of tracks and

the recording time have not

reached the limit, “DISC FULL”

may be displayed.

Even if several short tracks are

erased, the remaining recording

time may not show an increase.

Two tracks may not be combined

in editing.

The total of the recorded time and

time remaining on a disc may not

add up to the maximum possible

recording time.

When recorded tracks are played

back using the cue and review op-

erations, some sounds may be

skipped.

A track number can be created in

the middle of a track.

ERROR MESSAGES

Error messages RemedyMeaning

BLANK MD

BATT EMPTY

● The battery is run down. ● Charge the rechargeable battery or

replace the alkaline battery (or use

the AC adaptor for power).

● Nothing is recorded. ● Replace the disc with a recorded disc.

Can’t COPY

● No copy can be made because of

the SCMS copyright system.

● Record using the analogue cable.

Can’t EDIT

● A track cannot be edited. ● Change the stop position of the track

and then try editing it.

*: Number or Symbol.

PLAY MD

● You tried to record on a playback-

only disc.

● Replace it with a recordable disc.

Can’t READ*

● The disc data cannot be read be-

cause the disc is damaged.

● Reload the disc or replace it.

● Replace it with another recorded disc.

Can’t REC

●

Recording cannot be performed cor-

rectly due to vibration or shock in the unit.

● Re-record or replace it with another

recordable disc.

Can’t STAMP

● Editing is impossible. ● Check the number of tracks.

Can’t WRITE

● Cannot save the TOC information

correctly to a MiniDisc.(A large por-

tion of the disc has been damaged.)

● Replace the disc with another re-

cordable disc.

DEFECT

● The disc is scratched. ● If the sound you hear is not right, try

recording again.

● Replace the disc with another re-

cordable disc.

DISC FULL

● The disc is out of recording space. ● Replace it with another recordable

disc.

HOLD

LOCKED

NO DISC

Er-MD**

NO SIGNAL

● Poor connection of the digital cable.

● No output signal comes out from the

external unit to playback.

● The unit is in the hold mode. ● Return the HOLD switch to its origi-

nal position.

● The OPEN lever was moved during

recording or editing.

● Turn off the power and remove the

MiniDisc.

● A disc has not been loaded. ● Load a disc.

● You have come to the conclusion

that the unit is out of order.

● T o have it repaired, go to the distribu-

tor where you purchased the unit.

● Connect the digital cable securely.

● If the portable CD player has a function

to prevent sound skips,deactivate it.

● Playback with the connected unit.

– 7 –

MD-SR50H/50W/60E/60W

DISASSEMBLY

Cares before disassembling

When assembling the machine after disassembling or repair, observe the following requirements so as to ensure safety and performance.

1. Remove the batteries from the machine, and take out the mini-disc.

2. When assembling after repair, be sure to restore the initial location of wires. Since the screws are small, incorrect fixing may result in malfunction.

3. When repairing, pay utmost attention to static electricity of IC.

STEP

REMOVAL

1 Bottom Cabinet 1. Screw .....................(A1) x6 8-1

2 Top Cabinet 1. Open the Top cabinet. 8-1

3 Main PWB 1. Screw .................... (C1) x4 8-2

4 Mechanism Unit 1. Raise the rear part, and 8-3

PROCEDURE

2. Open the Battery Cover.

3. Screw ..................... (B1) x4

4. Flexible PWB..........(B2) x2 8-2

2. Flexible PWB......... (C2) x2

3.Solder joint ............. (C3) x2

remove in the arrow direction.

FIGURE

(B1)x2 ø1.4x2mm

(A1)x2 ø1.4x2mm

Open Lever

(C3)x1

(A1)x2 ø1.4x2mm

Top Cabinet

Bottom Cabinet

Figu re 8-1

(C1)x4 ø1.7x2.5mm

(A1)x2 ø1.4x2mm

Battery Cover

(B1)x2 ø1.4x2mm

(A1)x2 ø1.4x2mm

(C3)x1

(B2)x2

Mechanism Unit

pull

(C2)x1*

(C2)x1

Main PWB

Mechanism Unit

Felt

Caution:

Carefully handle the main PWB and flexible PWB. After removing the flexible PWB (1*) for the optical pickup from the connector, do not touch directly the front end of flexible PWB with your hand so as to prevent damage of optical pickup by static electricity.

Put the fold on the connector, and apply with the felt. Sagging may result in contact with the sheet matal

Figure 8-2Figure 8-3

– 8 –

REMOVING AND REINSTALLING THE MAIN PARTS

Remove the mechanism according to the disassembling methods 1 to 4. (See Page 8.)

MD-SR50H/50W/60E/60W

(A2)x3 ø1.4x2.8mm

How to remove the spindle motor (See Fig. 9-1.)

1. Remove the solder joint (A1) x 1 of flexible PWB.

2. Remove the screws (A2) x 3 pcs., and remove the spindle motor.

How to remove the Lift motor (See Fig. 9-2.)

1. Remove the solder joints (B1) x 2 of head up/down motor

lead wire.

2. Remove the screw (B2) x 1 pc., and remove the flexible PWB.

3. Remove the screw (B3) x 1 pc., and remove the head up/ down motor.

Note:

Take care so that the motor gear is not damaged. (If the gear is damaged, noise is caused.)

How to remove the sled motor (See Fig. 9-3.)

1. Remove the stop washer (C1) x 1 pc., and remove the drive

gear (C2) x 1 pc.

2. Remove the screws (C3) x 2 pcs., and remove the sled

motor.

3. Remove the solder joints (C4) x 2 of flexible PWB.

Note:

Take care so that the motor gear is not damaged. (If the gear is damaged, noise is caused.)

How to remove the magnetic head (See Fig. 9-4.)

1. Remove the screws (D1) x4 which connects the magnetic

head to the head relay flexible PWB, remove the spring washers (D2) x 2 and remove the soldering joints (D3) x 2.

Note:

Mount carefully so as not to damage the magnetic head. (If the gear is damaged, noise is caused.)

(B3)x1 ø1.4x5.5mm

Remove the Solder joint (B1)x2

Lift Motor

Stop Washer

Driver Gear

Spindle Motor

(C1)x1

(C2)x1

Figure 9-1

Figure 9-2

Mechanism Flexible PWB Solder joint (A1)x1

MD Mechanism

(B2)x1 ø1.4x1.5mm

MD Mechanism

(C3)x2 ø1.4x1.2mm

Sled Motor

Mechanism Flexible PWB Solder joint (C4)x2

How to reinstall the optical pickup unit (See Fig. 9-5.)

1. Remove the screw (E1) x 1 pc.

2. Slowly raise the optical pickup.

(E1)x1 ø1.7x3mm

Guide Shaft

Optical Pickup Unit

Figure 9-5

Thrust Plate Spring

MD Mechanism

– 9 –

Figure 9-3

Magnetic Head

Figure 9-4

MD Mechanism

(D1)x1 ø1.4x1.5mm

(D1)x1 ø1.2x1.6mm

MD Mechanism

(D1)x2 ø1.4x2.2mm

(D2)x2 Spring joint

Solder joint

(D3)x2

MD-SR50H/50W/60E/60W

ADJUSTMENT

Test disc

MD adjustment needs two types of disc, namely recording disc (low reflection disc) and playback-only disc (high reflection disc).

Type

Test disc

Parts No.

1 High reflection disc MMD-110 (TEAC Test MD) 88GMMD-110 2 Low reflection disc MMD-212 (TEAC Test MD) 74-minute disc 88GMMD-212 3 Low reflection disc MMD-213A (TEAC Test MD) 80-minute disc 88GMMD-213A 4 Low reflection disc Recording minidisc UDSKM0001AFZZ

Note: Use the low reflection disc on which music has been recorded.

Entering the TEST mode

1. Setting at port (power nonconnected state)

(1) Set the port as follows. TEST1 : "Low" (TP416) TEST0 : "High" (2) Turn the Power ON. (3) Test Mode START [ T E S T _ ]

2. Setting by special button operation (in standby state)

(1) Holding down the DISP button and ENTER button, press the PLAY button. (2) Normal mode setting initialization (BASS setting, VOL setting, etc.) *Since the unit is changed to the setting for production line inspection , be sure to set it to the default setting state in the following default setting procedure before returning it to the user. (3) Indication of microcomputer version for one second [ Y 1 9 A b X ]

Destination

Microcomputer version

(4) Whole LCD lighting for 2 seconds (5) Test Mode START [ T E S T _ ] *When the PLAY button is pressed during indication (3) and (4), the process proceeds to (5).

EEPROM version

Leaving the TEST mode

(1) Press the STOP button in the TEST mode stop state.

Shipping setting method

Holding down simultaneously the VOLUME-DOWN Button and PLAY Button of the set unit without disc, supply the power from the DC IN plug. After the indication "INIT" -> "BYE OK" disappears, release the power supply of DC IN.

Test Mode

1. AUTO 1 Mode • Perform preliminary automatic adjustment.

2. AUTO 2 Mode

3. TEST-PLAY Mode

4. TEST-REC Mode

5. MANUAL 1 Mode

6. MANUAL 2 Mode

• If the combination of mechanism and pickup PWB has been changed, be sure to start from

AUTO1.

• Perform ATT (attenuator) automatic adjustment.

• Perform continuous playback (error rate display, jump test)

• Continuous playback from the specified address is performed.

• 1 line, 10 lines or 384 lines manual jump is performed.

• C1 error rate display (pit section), ADIP error rate display (groove section)

• The temperature correction is performed only when servo start is performed, but the posture correction is not performed during continuous playback.

• Continuous record from the specified address is performed.

• Change of record laser output(servo gain is also changed according to laser output).

• The temperature correction is performed only when servo start is performed, but the posture correction is not performed during continuous recording.

• Temperature is displayed. (Updating in real time)

• Seeing the displayed adjustment value, perform

preliminary manual adjustment. (Error rate indication, jump test)

• Temperature is displayed. (Updating in real time)

• Seeing the displayed adjustment value perform manfully the preliminary adjustment.

(Error rate indication, jump test)

• Continuous playback is performed

(error rate display, jump test).

7. RESULT 1 Mode

8. RESULT 2 Mode

9. DIGITAL INPUT Mode

10. ERROR INFORMATION Mode • Error information is initialized

11. NORMAL Mode

12. EEPROM Mode

13. INNER Mode

• The value adjusted in AUTO1 or MANUAL1 is indicated.

• (Execution in servo "OFF" state").

• The value adjusted in AUTO 2 or MANUAL 2 is indicated.

• Adjustment value is changed manually. (error rate display, jump test).

• Digital input information is displayed.

• Error information is displayed.

• The mode is changed from the TEST mode to the normal mode without adjustment.

• In the normal mode the internal operation mode, memory capacity, etc. areindicated.

• In the normal mode both temperature correction and posture correction are perfomed.

• Factors of digital servo are changed manually. (Each servo is turned on individually.)

• Cut-off frequency of BASS1, BASS2 and BASS3 is selected manually.

• Temperature detection terminal voltage is measured, and the reference value is set.

• Defaults are selected and set.

• Setting of EEPROM protect area is updated. (In case of protect releasing)

• Determine the position where the INNER switch is turned on. (only high reflection disc).

• The temperature correction is performed only when servo start is performed, but the posture correction is not performed.

– 10 –

MD-SR50H/50W/60E/60W

Operation in each TEST mode

1. AUTO1 Mode

• When the STOP button is pressed while the AUTO1 menu appears or during automatic adjustment, the mode changes to the TEST mode stop state. At this time the adjustment value is not output.

• Be sure to adjust, using the specified disc MMD-213A or MMD-212.

At this time release the EEPROM (IC402) protection. (Refer to EEPROM write procedure.)

• Adjustment NG; Adjustment item out of range, focus ON failure, and adjustment error

• When the PLAY button is pressed while ADJ. OK is displayed, AUTO2 is executed.

2. AUTO2 Mode

• When the STOP button is pressed while the AUTO2 menu appears or during automatic adjustment, the mode changes to the TEST mode stop state. At this time the adjustment value is not output.

• Adjustment NG; Adjustment item out of range, and adjustment error.

• When the PLAY button is pressed while ADJ. OK is displayed,TEST_PLAY is executed.

3. TEST-PLAY Mode

• When the STOP button is pressed while the TEST-PLAY menu appears, or in TEST-PLAY or continuous playback mode, the mode changes to the TEST mode stop state.

• When the PLAY button is pressed while the TEST-PLAY menu appears,continuous playback is initiated from the current pickup position.

• Whenever the DISP button is pressed in the TEST-PLAY menu, the target address changes as follows.

When the PLAY button is pressed while a target address is displayed, continuous playback is performed after searching that address.

• Each time the MODE button is pressed while the TEST-PLAY mode target address is displayed, the digit which is changed by pressing the SKIP UP/DOWN button is changed as follows.

• When the SKIP UP button is pressed in the TEST-PLAY mode target address is displayed, the digit of address specified by the MODE button is set to +1h. (0 to F)

• When the SKIP DOWN button is pressed in the TEST-PLAY mode target address is displayed, the digit of address specified by the MODE button is set to -1h. (0 to F) * When the SKIP UP/DOWN button is held down, the setting changes continuously, one cycle being 100 ms.

• When the BASS button is pressed in the continuous playback mode, the number of jump lines changes as follows.

* After the number of jump lines is indicated for one second, the address indication is restored. [ T R _ ]

• When the SKIP UP button is pressed in the continuous playback mode, the specified number of lines is jumped in the FWD direction.

• When the SKIP DOWN button is pressed in the continuous playback mode, the specified number of lines is jumped in the REV direction. * When the SKIP UP/DOWN button is held down, jump is repeated every approx. 100 ms.

•Whenever the DISP button is pressed in the continuous playback mode, the indication changes as follows. * Pre-mastered disc

* Recordabl disk

0032 — 03C0 — 0700 — 08A0 — 0950— 0032 —

0032 — 0032 — 0032 — 0032 —

1 — 10 — 384 — 1

Continuous playback (SUBQ address indication) [ S Q ]

Continuous playback (C1 error indication) [ C E ]

Continuous playback (SUBQ address indication) [ S Q ]

Continuous playback (ADIP address indication) [ A P ]

Continuous playback (C1 error indication) [ C E ]

Continuous playback (ADIP error indication) [ A E ]

Continuous playback (ADIP address indication) [ A P ]

4. TEST-REC Mode

• When the STOP button is pressed while the TEST-REC menu appears, or in the TEST-REC mode or continuous record mode, the mode changes to the TEST mode stop state.

• When the PLAY button is pressed while the TEST-REC menu appears, the continuous record is initiated from the current pickup position.

• Whenever the DISP button is pressed in the TEST-REC menu, the target address changes as follows.

0032 — 03C0 — 0700 — 08A0 —0950 — 0032 —

When the PLAY button is pressed while a target address is displayed, continuous playback is performed after searching that address.

• Whenever the MODE button is pressed in the TEST-REC mode target address is displayed, the digit which is changed by the SKIP UP/

DOWN button changes as follows.

0032 — 0032 — 0032 — 0320 —

• When the SKIP UP button s pressed in the TEST-REC mode target address is displayed, the digit of address specified by the BASS button is set to +1h.(0 to F)

• When the SKIP DOWN button is pressed in the TEST-REC mode target address is displayed, the digit of address specified by the BASS button is set to -1h. (0 to F)

* When the SKIP UP/DOWN button is held down, the setting changes continuously, one cycle being 100 ms.

– 11 –

MD-SR50H/50W/60E/60W

5. NORMAL Mode

• When the STOP button is pressed while the NORMAL menu appears, the mode changes to the TEST mode stop state.

• Indication during operation Indication of memory capacity on main unit LCD [ ] + Level meter

: Internal mode : Address (Cluster section)

• Selection of sound volume, BASS, etc. is possible (without indication)

• Recording is also possible.

• If the STOP button is pressed during operation in the NORMAL mode, the NORMAL mode is canceled, and the power is turned off.

6. Error data display Mode

• Reversing when SKIP DOWN button is pressed

• When the STOP button is pressed while the error data indication menu appears or during error data indication, the mode changes to the TEST mode stop state.

• Error data 0 is the latest error.

• Error which occurred in the TEST mode is also stored in the memory.

• When the DISP button is pressed while the error data indication menu appears, the error data is initialized. [ C L E A R _ ]

• : Error Code

Explanation of error history code

12h : RF side FG, TG, and TCRS adjustment termination failure 13h : Adjustment servo retraction excessive retrial 16h : C. IN detection time-over 17h : A, B, E, F, and TCRSO offset measurement value out of

tolerable range 21h : Focus retraction completion allowable time-over 23h : Track search completion allowable time-over 24h : Disc linear speed measurement failure 32h : P-TOC read failure 42h : U-TOC read failure 44h : U-TOC write data write disabled/read check error 52h : SD write data write disabled 71h : Pickup position initialization time-over 72h : EEPROM data read check sum error 73h : Record head drive disabled (by EJECT lever) 82h : Power overvoltage detection 91h : Ambient temperature is higher that the allowable tempera-

ture.

: Address (Sector section)

7. INNER Mode

• when the STOP button is pressed on the INNER menu (SQ______ ), the state is changed to the TEST mode STOP state.

• : Address

– 12 –

MD-SR50H/50W/60E/60W

EEPROM (IC402) writing procedure

1. Procedure to replace EEPROM and write initial value of microcomputer in EEPROM

(1) Replace EEPROM. (2) Refer to the latest EEPROM data list. (3) Press the Display button, ENTER button and Play button to start the test mode. (4) Version display

[ V e r . ]

(5) The whole LCD lights. (6) Test mode stop state.

[ T E S T ]

(7) Press the "BASS" button, and press twice the "SKIP DOWN" button.

[ E E P R O M ]

(8) Perform the operation to display "EEPROM SETTING MODE CHART", compare the EEPROM DATA LIST with the display,

and set according to the EEPROM DATA LIST with the VOL UP or VOL DOWN key.

(9) Set the temperature reference. (Refer to the Temperature Reference Setting Method.)

(10)

Set according to the EEPROM DATA LIST.

(11)

Press the Stop button.

[ T E S T ]

(12)

Press the Stop button.

(13)

After data is written in EEPROM, turn off power .

(14)

Restore protection of EEPROM.

EEPROM version (b ~ Z) Microcomputer ROM version

2. Temperature reference setting method

[1] Measurement, calculation and setting procedure

(1) Set the TEST mode.

• Set TEST 1, 0 = '01', and turn on power (or set PLAY ON in standby state). (2) Start the EEPROM mode 'Temp' menu.

• Key operation in order of BASS, SKIP-DOWN x 2 times, PLAY, PLAY in the test mode STOP state.

• 'TM$$%%' is displayed. ($$= Temperature code, %% = Temperature reference) (3) Once press SKIP-UP, and determine the displayed microcomputer TEMP input AD value.

• 'TPin##' is displayed. (## = TEMP input AD value) (4) At the ambient temperature, determine the temperature corrected value from the temperature measurement value

correction table.

(5) Determine the temperature reference, using the following formula.

• Temperature reference = Microcomputer TEMP input AD value + Temperature corrected value (6) Set the temperature reference value by button operation , and check whether the temperature code indication corresponds to "Temperature

Code Identification Table".

[2] Temperature measurement value correction table

Ambient

temperature

+ 9oC ~ +11oC - 05h + 10.0oC +12oC ~ +14oC - 04h + 12.7oC +15oC ~ +16oC - 03h + 15.4oC +17oC ~ +19oC - 02h + 18.2oC +20oC ~ +22oC - 01h + 20.9oC +23oC ~ +24oC ± 00h + 23.6oC +25oC ~ +27oC + 01h + 26.3oC +28oC ~ +30oC + 02h + 29.0oC +31oC ~ +33oC + 03h + 31.8oC

Temperature

correction

Center

temperature

Ambient

temperature

- 9oC ~ +10oC 08h + 0.5oC

+ 3oC ~ +21oC 07h + 12.5oC +15oC ~ +33oC 06h + 23.6oC +26oC ~ +43oC 05h + 35.0oC

Temperature

correction

Center

temperature

– 13 –

MD-SR50H/50W/60E/60W

EEPROM DATA LIST (EEPROM version b)

TEMP setting

Item display Set values

T M _ _ Calculate values

Fucus setting

Item display Set values

F G _ _ B 0 H F F 1 _ 7 0 H F F 2 _ E 8 H F Z H _ E D H F L n _ 0 A H D J G _ 1 4 H F L V _ 2 0 H W T f _ 2 0 H F S S _ E 9 H

Tracking setting

Item display Set values

T G _ _ 4 8 H T F 1 _ 7 0 H T F 2 _ E 0 H T F S _ 0 0 H T B o _ 4 4 H T B t _ 2 0 H T K o _ 4 4 H T K t _ 1 D H T D o _ 6 7 H T D t _ 3 4 H T G R _ 0 0 H S C t _ 4 0 H S C m _ 5 3 H C L p _ 1 8 H C L r _ 2 8 H J P I _ 0 1 H K 1 0 _ 6 5 H

Spindle setting

Item display Set values

S P G _ 1 4 H S P i _ E 0 H S P m _ A 0 H S P o _ 6 8 H S P 1 _ 1 0 H S P 2 _ 6 0 H S P 3 _ F 2 H S P 4 _ F 2 H S P 5 _ 1 0 H S P D _ 6 0 H S P K _ E B H

BASS setting

Item display Set values

B S 1 _ 3 F H B S 2 _ 1 F H B S 3 _ E 2 H

Sled setting

Item display Set values

S L G _ D F H S L 2 _ 2 0 H S L M _ 7 F H S L V _ A B H S K k _ 7 2 H S K t _ 4 C H S K m _ 7 0 H W T m _ 2 4 H M V 1 _ 4 4 H M V 2 _ 8 8 H S R V _ 0 0 H

ADJ. SET setting

Item display Set values

C O K _ A 0 H F A T _ C 0 H T A T _ 3 E H C A T _ 2 0 H F A B _ 6 4 H

EQ. SET setting

Item display Set values

H Q 1 _ 9 0 H H Q 2 _ 9 0 H H S G _ 1 1 H H S O _ F D H L Q 1 _ 9 0 H L Q 2 _ 9 0 H L S G _ 1 1 H L S O _ 0 0 H G Q 1 _ 9 8 H G Q 2 _ 8 4 H G S G _ 1 1 H F L p _ 0 8 H

Control setting

Item display Set values

C T 0 _ 0 1 H C T 1 _ 1 1 H C T 2 _ 4 0 H C T 3 _ 3 0 H R C 0 _ C 0 H R C 1 _ F E H S Y C _ A 6 H P W L _ 0 1 H D R 1 _ 0 0 H D R 2 _ 0 0 H I N 1 _ C 9 H I N 2 _ 6 4 H I N 3 _ 9 9 H

I N H _ 6 4 H D R H _ 0 C H P L E _ 1 B H R C E _ 4 2 H E L T _ 7 6 H S L T _ 4 5 H S P M _ 0 0 H M S L _ 0 0 H U S 0 _ 0 0 H U S 1 _ 0 0 H U S 2 _ 0 0 H

– 14 –

MD-SR50H/50W/60E/60W

: Test Mode STOP

: Pre-auto adjustment menu

: ATT auto adjustment menu

: Continuous record menu

: EEPROM setting menu

: INNER switch position measurement menu

BASS

T E S T

Slide external

periphery move

Slide internal

periphery move

Tset Mode Menu

Test Mode Change Chart

A U T O 1

A U T O 2

SKIP UP SKIP DOWN

SKIP DOWN

SKIP UP SKIP DOWN

T R E C

SKIP UP SKIP DOWN

: Continuous playback menu

T P L A Y

SKIP UP SKIP DOWN

: Digital input signal monitor menu

D i n M o n

SKIP UP SKIP DOWN

E E P R O M

SKIP UP SKIP DOWN

I N N E R

SKIP UP

SKIP DOWN

SKIP UP

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set.

* When the [PLAY] button operation is performed in the specific menu, the operation of this

menu is executed.

: Pre-adjustment value check menu

R S L T 1

: ATT adjustment value check menu

R S L T 2

: Pre-manual adjustment menu

M A N U 1

: ATT manual adjustment menu

M A N U 2

: Error history display menu

E D A T A

: Test mode normal playback menu

N O R M A L

: Preautomatic Adjustment menu

: Preadjustment error (adjustment value output)

: During preadjustment adjustment

Adjustment error

Normal end

: Preadjustment normal end (adjustment value output)

: During ATT automatic adjustment

PLAY

A U T O 1

Preautomatic Adjustment

A D J . O K

A D J . N G

A T 2

A T 1

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set.

* " " represent the adjustment number as follows.

0 0 : Innermost periphery move

0 2 : ABEF offset tentative measurement

0 4 : RF side focus gain coarse adjustment

0 5 : Focus ATT tentative setting

0 6 : RF side bit section tracking gain adjustment

0 7 : COUT level setting for pit section adjustment

0 8 : External periphery move

0 9 : RF side groove section tracking gain adjustment

1 0 : COUT level setting for groove section adjustment

1 1 : RF side TCRS gain adjustment

1 2 : Tracking ATT initial setting

1 3 : RF side focus gain minor adjustment

1 4 : Focus ATT initial setting

1 5 : S gain "High" ABEF offset measurement

1 6 : TCRS offset measurement

1 7 : S gain "Low" ABEF offset measurement

– 15 –

+ 33 hidden pages