SHARP MDMT15 Service Manual

MD-MT15/15C/15H/15W/161E/18H

SERVICE MANUAL

No. S7946MDMT15//

MD-MT15(S) MD-MT15C(S) MD-MT15H(RD)

Illustration: MD-MT15/15C

Illustration: MD-MT15H/15W Illustration: MD-MT161E/18H (Only printing is different.)

The machine MD-MT15/MT15C/MT15W is a modification of MD-MT20/MT20C/MT20W the difference is the Top Cabinet. Its performance and operation are identical with those of MDMT20/MT20C/MT20W. For details refer to the service manual (No.S6943MDMT20//) for MD-MT20/MT20C/MT20W.

MD-MT20/MT20C/MT20W

REMOVING AND REINSTALLING THE MAIN PARTS 11

ADJUSTMENT.............................................................. 12

TROUBLE SHOOTING................................................. 37

FUNCTION TABLE OF IC ............................................ 40

CIRCUIT DESCRIPTION.............................................. 42

Page

MD-MT15H(S) MD-MT15W(S) MD-MT161E(S) MD-MT18H(GR)

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

The machine MD-MT15H/MT161E/MT18H is a modification of MD-MT20H/MT16E the difference is the Top Cabinet. Its performance and operation are identical with those of MDMT20H/MT16E. For details refer to the service manual (No. S5933MDMT20H/) for MD-MT20H/MT16E.

MD-MT20H/MT16E

REMOVING AND REINSTALLING THE MAIN PARTS.. 9

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

TROUBLE SHOOTING................................................. 35

FUNCTION TABLE OF IC ............................................ 38

CIRCUIT DESCRIPTION .............................................. 40

Page

CONTENTS OF MD-MT15/15C/15H/15W/161E/18H

Page

SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT15W/15H/18H/161E ONLY) ..................................................... 2

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

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

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

QUICK GUIDE (MD-MT15 ONLY) ......................................................................................................................................... 8

DISASSEMBLY.................................................................................................................................................................... 10

NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 11

TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 11

VOLTAGE ............................................................................................................................................................................ 12

BLOCK DIAGRAM ............................................................................................................................................................... 13

SCHEMATIC DIAGRAM ...................................................................................................................................................... 14

WIRING SIDE OF P.W.BOARD........................................................................................................................................... 17

WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 22

PARTS GUIDE/EXPLODED VIEW PACKING OF THE SET (MD-MT15 FOR U.S.A. ONLY) PACKING METHOD (MD-MT161E ONLY)

This document has been published to be used

SHARP CORPORATION

– 1 –

for after sales service only. The contents are subject to change without notice.

MD-MT15/15C/15H/15W/161E/18H

SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT15W/15H/18H/161E ONLY)

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.

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

LASER KLASSE 1 LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARAT

For MD-MT15H/18H

For MD-MT15W/15H/18H

CAUTION

● 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 ad

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.

ustment as this may result in exposure to hazardous radiation.

For MD-MT15W

For MD-MT161E

Magnet head

Optical pick-up

Top Cabinet

Mechanism Chassis

Spindle motor

Magnet Head

Main PWB

Laser Beam

Optical Pick-Up

Figure 2-1 Figure 2-2

– 2 –

■ General

Power source:

DC 3.0V: Commercially available, “AA” size (LR6), alkaline

battery x 2

DC 2.4V: Optional Rechargeable Nickel-Metal Hydride bat-

tery (AD-T20BT) x 1

DC 4.5V: Optional car adaptor, AD-CA20X

(

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

system)

DC 5V: Optional AC adaptor (AD-T20APE, AC 230 - 240V ,

50/60 Hz)

Power consumption:

7 W (Optional AC adaptor)

Output power:

RMS; 20 mW (10 mW + 10 mW) (0.2% T .H.D.)

Charging time:

Approx. 4 hours (90 %) Approx. 6 hours (fully charged) (When using the AC adaptor)

)

Power source:

Power consumption:

Output power:

Charging time:

Battery life:

● The continuous recording time is for analog inputs when the volume level is set to “VOL

● 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

● The operating time when using an alkaline battery may be different, depending on the

Input sensitivity:

Output level:

Dimensions: Width: 3-7/16" (87.9 mm)

Weight: 0.40 lbs. (180g) without battery

Input jack: Line/optical digital, microphone (powered by the main unit)

Output jack: Headphones (impedance: 19 ohms)

■ MiniDisc Recorder

Type: Portable MiniDisc recorder

Signal readout: Non-contact, 3-beam semi-conductor laser pick-up

Audio channels: Stereo 2 channels/monaural (long-play mode) 1 channel

Frequency response:

Rotation speed: Approx. 400 – 900 rpm

Error correction: ACIRC (Advanced Cross Interleave Reed-Solomon Code)

Coding: ATRAC (Adaptive Transform Acoustic Coding), 24-bit com-

Recording method: Magnetic modulation overwrite method

Sampling frequency:

Wow and flutter:

MD-MT15H/18H/161E

Output level:

Dimensions: Width: 87.9 mm (3-7/16")

Weight: 180g (0.40 lbs.) without battery

Input socket: Line/optical digital, microphone (powered by the main unit)

Out

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

MD-MT15/15C

DC 5V: AC adaptor (AC 120V, 60 Hz) DC 3.0V: Commercially available, “AA” size (LR6), alkaline

DC 2.4V: Optional Rechargeable Nickel-Metal Hydride batDC 4.5V: Optional car adaptor, AD-CA20X

7.5 W (AC adaptor) RMS; 20 mW (10 mW + 10 mW)

(0.2% T.H.D.) Approx. 4 hours (90 %)

Approx. 6 hours (fully charged) (When using the AC adaptor included with the unit)

0”.

ambient temperature of 68°F (20°C). type and manufacturer of the battery, and on the operating temperature.

Recording level Reference input level Input impedance

Height: 1-3/16" (29.8 mm) Depth: 3-1/8" (79.7 mm)

20 – 20,000 Hz (± 3 dB)

puted type

44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz, and then recorded.)

Unmeasurable (less than ±0.001% W. peak)

ut socket: Earphones (impedance: 32 ohms

Height: 29.8 mm (1-3/16") Depth: 79.7 mm (3-1/8")

battery x 2 tery (AD-T20BT) x 1 (for cars with a 12-24V DC negative ground elec-

trical system)

When using two, commercially available, high capacity, “AA” size (LR6), alkaline batteries

Continuous recording:

Approx. 7.5 hours

Continuous play:

Approx. 15 hours

MIC H 0.25 mV 10 k ohms MIC L

LINE 100 mV 20 k ohms

Specified

output

Headphones — 10 mW + 10 mW 16 ohms

LINE

Earphones — 10 mW + 10 mW 32 ohms

LINE

250 mV (-12dB)

Specified

output

250 mV (-12dB)

When using the optional rechargeable battery AD-T20BT (fully charged)

Continuous recording:

Approx. 7.5 hours

Continuous play: Approx. 12 hours

2.5 mV 10 k ohms

Maximum

output level

—

Maximum

output level

—

SPECIFICATIONS

MD-MT15H

Power source:

Power consumption: Output power:

Charging time:

MD-MT161E

MD-MT18H

Load

impedance

10 k ohms

Load

impedance

10 k ohms

Power source:

Power consumption: Output power:

Charging time:

MD-MT15W

Power source: DC 3.0V [Commercially

Output power: RMS; 20 mW (10 mW + 10 Battery life:

When using two, commercially available, high capacity, “AA” size (LR6), alkaline batteries

Continuous recording: Approx. 7.5 hours

Continuous play: Approx. 15 hours

● The continuous recording time is for analogue inputs 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 used at an ambient temperature of 20°C (68°F).

● The operating time when using alkaline batteries may be different, depending on the type and manufacturer of the batter

, and on the operating temperature.

Specifications for this model are subject to change without prior notice

– 3 –

MD-MT15/15C/15H/15W/161E/18H

DC 3.0V: Commercially available, “AA” (LR6) size, alkaline DC 2.4V: Optional Rechargeable Nickel-Metal Hydride batDC 4.5V: Optional car adaptor, AD-CA20X

DC 5V:

7 W (Optional AC adaptor) RMS; 20 mW (10 mW + 10 mW)

(0.2% T .H.D.) Approx. 4 hours (90 %)

Approx. 6 hours (fully charged) (When using the AC adaptor)

DC 5V: DC 3.0V: Commercially available, “AA” (LR6) size alkaline

DC 2.4V: Optional Rechargeable Nickel-Metal Hydride batDC 4.5V: Optional car adaptor, AD-CA20X

7 W (AC adaptor) RMS; 20 mW (10 mW + 10 mW)

(0.2% T .H.D.) Approx. 4 hours (90 %)

Approx. 6 hours (fully charged) (When using the AC adaptor included with the unit)

available, “AA” size (LR6), alkaline battery x 2] DC 4.5V [Optional car adaptor, AD-CA20X (for cars with a 12-24V DC negative earth electrical system)]

mW) (0.2% T.H.D.)

battery x 2 tery (AD-T20BT) x 1 (for cars with a 12-24V DC negative earth electri-

cal system) Optional AC adaptor (AD-T20APH, AC 220 - 230V, 50/60 Hz)

AC adaptor (AC 220 - 230V, 50/60 Hz) battery x 2 tery (AD-T20BT) x 1 (for cars with a 12-24V DC negative earth electri-

cal system)

Input sensitivity:

Recording

Output level:

Earphones

Dimensions: Width 87.9 mm (3-7/16")

Weight: 180 g (0.40 lbs.) without Input socket: Line/optical digital, micro-

Output socket: Earphones (impedance:

Reference input

level MIC H 0.25 mV 10 k ohms MIC L 2.5 mV 10 k ohms

LINE

level

100 mV 20 k ohms

Maximum

Specified

output

10 mW +

—

250 mV (-12dB)

Height 29.8 mm (1-3/16") Depth 79.7 mm (3-1/8")

battery phone (powered by the

main unit) 32 ohms)

output

level

10 mW

—

Input

impedance

32 ohms

10 k ohms

Load

MD-MT15/15C/15H/15W/161E/18H

NAMES OF PARTS

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. Edit/Auto Mark/Time Mark Button

18. Mode Button

19. Display/Character Select Button

20. Bass/Delete Button

21. Enter/Fast Play/Synchro Button

22. Volume Up/Cursor Button

23. Volume Down/Cursor/Charge Button

24. Record/Track Mark Button

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

26. Stop/Power Off Button

27. Play/Pause Button

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

Illustration: MD-MT15/15C

123456

11 12

13 14

18 20 21

15 16

27262524

7 8

9 10

22 23

29. Open Lever

30. Headphones Jack (MD-MT15/15C)

30. Earphones Socket (MD-MT15H/15W/161E/18H)

31. Optical/Line Input Jack

32. Microphone Input Jack

33. Hold Switch

34. 5V DC Input Jack

35. Battery Cover

– 4 –

30 31

32 33

34 35

OPERATION MANUAL

RECORDING USING THE OPTICAL DIGITAL CABLE

This is the method used for recording digi-

tal signals from CDs exactly as they are

stored on the original. Compared to record-

ings made from analog inputs, digital re-

cordings have extremely high-quality

sound.

Connect the external equipment.

Start recording.

Synchro recording:

Before starting a synchro recording,

perform the following steps on the

equipment connected to this unit.

(1) First, put it in the playback mode.

(2) Next, put it in the pause mode.

(3) Finally, position it at the beginning

of the track you want to record.

(1) Insert a recordable MiniDisc, and

then press the REC button.

(2) Press the ENTER/SYNC button.

(3) Start the playback on the equipment

connected to this unit.

Manual recording:

(1) Insert a recordable MiniDisc, and

then press the REC button.

(2) Press the

button.

● When recording from digital inputs,it

is not necessary to adjust the record-

ing level.

Notes:

● This unit incorporates a sampling rate

converter.

When this unit is connected to digital

equipment such as a DSS tuners or a

DAT tape recorder that use a different

sampling frequency (32 kHz or 48 kHz),

recordings 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

Analog recording is

possible.

Recording

Playback

Digital cable

Recording

MD player

POWER SOURCE

■ Alkaline batteries power

● Use two commercially available alkaline

batteries (LR6, “AA” size).

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 two alkaline batteries according

to the polarity marked on the bottom of

the unit.

● Installing the batteries incorrectly may

cause the unit to malfunction.

Close the battery cover.

You can power this unit with AC adaptor or commercially available alkaline batteries

(LR6, “AA” size).

You can also power this unit with a rechargeable battery (AD-T20BT) o r car adaptor

(AD-CA20X) which are available separately.

■ AC power (For MD-MT15/15C/18H)

Connect the cord from the AC adaptor

to the DC IN 5V jack on the unit.

Plug the AC adaptor into an AC outlet.

Notes:

● When there is thunder or lightning in your

vicinity, unplug the AC adaptor from the

AC outlet.

● When the unit is not in use for extended

periods, remove the AC adaptor from the

AC outlet.

● Never use an AC adaptor other than the

one specified. Otherwise, problems or

serious hazards may be created.

● Do not bend, twist or tie the power cord

or put heavy objects on top of it.

● Be sure to hold the plug when removing

it. If you pull on the cord, it may break, or

the unit may malfunction.

AC 120V, 60 HzInsert securely,

all the way in.

To the DC IN 5V jack

(MD-MT15/15C)

AC 220-230V,

50/60 Hz

Insert securely,

all the way in.

To the DC IN 5V socket

(MD-MT18H)

● AC adaptors of MD-MT15H/15W/161E

are option parts.

MD-MT15/15C/15H/15W/161E/18H

– 5 –

MD-MT15/15C/15H/15W/161E/18H

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

authorized SHARP dealer or service center.

■ 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 out-

let.

2. Remove the battery.

3. Leave the unit completely unpowered for

approximately 30 seconds.

4. Plug the AC adaptor back into the AC

outlet 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

outlet immediately and contact an autho-

rized SHARP service center.

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 headphones 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 while 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 headphones.

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.

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.

If the hold function is active while the power

is turned off, the power cannot be turned

on by mistake and the battery will not be

accidentally drained.

CONVENIENT OPERATION OF THE UNIT

< How to read the battery indicator >

● When the battery is completely dis-

charged, the battery indicator will flash.

Recharge the battery or replace the al-

kaline batteries with new ones.

● When the battery has run completely out,

“BATT EMPTY” will appear. Then, the

power will be disconnected automatically.

Notes:

● When using the unit with alkaline bat-

teries or a rechargeable battery, the bat-

tery indicator will not correctly display

the remaining capacity for approximately

10 seconds after the power has been

turned on.

● When an AC adaptor or a car adaptor is

used, the battery indicator will not be

shown.

● The number of bars shown in the bat-

tery indicator may increase or decrease,

depending on the operation being per-

formed. 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.

– 6 –

MD-MT15/15C/15H/15W/161E/18H

● The battery is run down.

● Nothing is recorded.

● No copy can be made because of

the SCMS copyright system.

● A track cannot be edited.

●

Recording cannot be performed cor-

rectly due to vibration or shock in the unit.

● Editing is impossible.

● The disc is scratched.

● Poor connection of the digital cable.

● The disc is out of recording space.

● The unit is in the hold mode.

● The OPEN lever was moved during

recording or editing.

● A disc has not been loaded.

● You tried to record on a playback-

only disc.

● Improper power is being supplied.

● The MD is write protected.

● The disc is damaged.

● Since a track number is currently

being located or written to, the unit

cannot accept your command.

● You have come to the conclusion

that the unit is out of order.

● The temperature is too high.

● A large portion of the disc has been

damaged.

● There is no space left for recording

character information (track names,

disc names, etc.).

● The track has been protected from

being erased.

● A large portion of the disc has been

damaged.

● There is an error in the recorded sig-

nal.

● A disc which contains data other than

music was played.

● There is an error in the signal from

the disc.

● Charge the rechargeable battery or

replace the alkaline batteries (or use

the AC adaptor for power).

● Replace the disc with a recorded disc.

● Record using the analog cable.

● Change the stop position of the track

and then try editing it.

● Re-record or replace it with another

recordable disc.

● Check the number of tracks.

● If the sound you hear is not right, try

recording again.

● Replace the disc with another re-

cordable disc.

● Connect the digital cable securely.

● Replace it with another recordable

disc.

● Return the HOLD switch to its origi-

nal position.

● Turn off the power and remove the

MiniDisc.

● Load a disc.

● Replace it with a recordable disc.

● Use one of the specified power

sources.

● Move the write protection knob back

to its original position.

● Reload the disc or replace it.

● Replace it with another recorded disc.

● Wait for a while and try the opera-

tion again.

● To have it repaired, go to the distribu-

tor where you purchased the unit.

● Turn off the power, and wait for a

while.

● Replace it with another recorded

disc.

● Replace it with another recordable

disc.

● Edit the track with the device on

which it was recorded.

● Replace it with another recorded

disc.

● Erase all of the signal errors, and

then try recording again.

● A disc which contains non-music

data cannot be played.

● Replace it with another recorded

disc.

ERROR MESSAGES

Error messages

Remedy

BATT EMPTY

BLANK DISC

Can’t COPY

Can’t EDIT

Can’t REC

Can’t WRITE

DEFECT

Din UNLOCK

READ ERROR

DISC FULL

HOLD

LOCKED

LOCK ERROR

NO DISC

PB DISC

POWER ?

SORRY

SYSTEM ERR

TEMP OVER

TOC ERROR

TOC FULL

Tr. Protect

U TOC ERROR

? DISC

Meaning

PROTECTED

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 while 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.

– 7 –

MD-MT15/15C/15H/15W/161E/18H

Check the supplied accessories /

Compruebe los accesorios suministrados

Power source /

Alimentación

PORTABLE MINIDISC RECORDER

Quick Guide/Guía rápida

MD-MT15

■ Rechargeable battery power (Separately available)

■

Alimentación de la batería recargable (Disponible por separado)

• AC 120V, 60Hz

•

120V CA, 60Hz

■ Alkaline battery power (Commercially available)

■

Alimentación de la pila alcalina (Disponible en las tiendas del ramo)

● Carrying Bag x 1

●

Caja para el

transporte x 1

● Analog Cable x 1

●

Cable analógico x 1

● AC Adaptor x 1

●

Adaptador de CA x 1

● Headphones x 1

●

Auriculares x 1

■AC power

■

Alimentación de CA

• AC 120V, 60Hz

•

120V CA, 60Hz

MIC IN

PLUG IN

POWER

Connection /

Conexión

■ Analog recording

■

Grabación analógica

■ Digital recording

■

Grabación digital

■ Microphone

■

Micrófono

Stereo microphone

Micrófono estéreo

Recording side

Lado de grabación

OPTICAL/

LINE IN

• To the line output jacks

on a stereo

•

A los enchufes de

salida de línea de un

equipo estéreo

(RIGHT)

(DERECHO)

• Analog cable included with this unit

•

Cable analógico suministrado con este

(LEFT)

(IZQUIERDO)

Playback side

Lado de reproducción

Recording side

Lado de grabación

OPTICAL/

LINE IN

• Optical digital cable

(AD-M1DC, available separately)

•

Cable óptico digital

(AD-M1DC, disponible por separado)

Playback side

Lado de reproducción

Recording side

Lado de grabación

DIGITAL OUT

AUDIO OUT

QUICK GUIDE (MD-MT15 ONLY)

– 8 –

MD-MT15/15C/15H/15W/161E/18H

Mientras se produce el sonido del equipo externo

conectado a este aparato, pulse el botón o

para ajustar el nivel de grabación.

Recording /

Grabación

To turn off the power:

Para desconectar la alimentación:

To remove the MiniDisc:

Para extraer el minidisco:

Turn off the power and move the OPEN lever in the

direction indicated by the arrow.

Desconecte la alimentación y mueva la palanca OPEN en el

sentido indicado por la flecha.

Press the ENTER/SYNC button.

Pulse el botón ENTER/SYNC.

Begin playback on the source equipment.

Inicie la reproducción en el equipo fuente.

Press the REC button.

Pulse el botón

REC.

When a sound, such as a person speaking, is

picked up by the microphone, recording will

begin automatically.

Connect the stereo microphone to the MIC IN jack.

Insert a recordable MiniDisc.

Inserte un minidisco grabable.

■ Recording from CDs or MDs (Synchro recording)

■

Grabación de discos compactos o minidiscos (Grabación sincronizada)

■ Recording from the microphone (Mic synchro recording)

■

Grabación de un micrófono (Grabación sincronizada con micrófono)

Press the ENTER/SYNC button to select the

synchro recording level. (This level can be

changed, even while recording.)

Press the ■/:OFF button while in the stop mode.

Pulse el botón

■

/:OFF estando en el modo de parada.

Connect the external equipment.

Conecte el equipo externo.

Insert a recordable MiniDisc.

Inserte un minidisco grabable.

Press the REC button.

Pulse el botón REC.

While playing sound from the external

equipment connected to this unit, press the

or button to adjust the recording

level.

Press the ■/:OFF button.

Pulse el botón

■

/:OFF.

To stop recording:

Para detener la grabación:

Conecte el micrófono estéreo al enchufe MIC IN del

aparato principal.

Pulse el botón o para ajustar el nivel

de grabación.

Press the or button to adjust the

recording level.

Pulse el botón ENTER/SYNC para seleccionar el

nivel de la grabación sincronizada. (Este nivel podrá

cambiarse incluso durante la grabación.)

Cuando el micrófono capte un sonido, el de una

persona que hable por ejemplo, la grabación

empezará automáticamente.

Playing a MiniDisc /

Reproducción de un minidisco

Insert the headphones plug into the

jack.

Push the plug all the way in.

Insert a MiniDisc.

Inserte un minidisco.

● The power will be turned on automatically, and playback

will start from the first track.

(Auto-play function)

●

La alimentación se conectará automáticamente, y la

reproducción empezará desde la primera pista.

(Función de reproducción automática)

To interrupt playback:

Para interrumpir la reproducción:

Press the button during playback.

● To resume playback, press the button again.

Pulse el botón

durante la reproducción.

●

Para reanudar la reproducción, pulse de nuevo el botón

To turn off the power:

Para desconectar la alimentación:

Press the button.

In the following cases, the auto-play function will not work.

● When the recordable MiniDisc write protection tab is

closed.

● When the auto-play function has been canceled.

Playback does not start when a MiniDisc is inserted:

La reproducción no empieza cuando se inserta un

minidisco:

Sound control /

Control del sonido

Adjust the bass level.

Each time the BASS button is pressed, the tone will be

switched as follows:

• Volume (0 - 30)

•

Volumen (0 - 30)

To stop playback:

Para detener la reproducción:

Press the ■/:OFF button.

Pulse el botón

■

/:OFF.

Press the ■/:OFF button while in the stop mode.

Pulse el botón

■ /

:OFF estando en el modo de parada.

Ajuste el volumen.

Pulse el botón VOLUME + para aumentar el volumen y el

botón VOLUME – para reducirlo.

Adjust the volume.

Press the VOLUME + button to increase the volume and

the VOLUME – button to decrease the volume.

BASS 1 ------- Bass sounds are emphasized slightly.

BASS 2 ------- Bass sounds are emphasized more.

BASS 3 ------- Bass sounds are emphasized even more.

BASS OFF ----Bass emphasis is canceled.

BASS 1 -------

Los sonidos graves se realzan ligeramente.

BASS 2 -------

Los sonidos graves se realzan más.

BASS 3 -------

Los sonidos graves se realzan aún más.

BASS OFF ----

El realce de los graves se cancela.

Pulse el botón

En los casos siguientes, la función de reproducción

automática no se activará.

●

Cuando esté cerrada la lengüeta de protección contra

escritura del minidisco grabable

●

Cuando haya sido cancelada la función de reproducción

automática

Ajuste el nivel de los graves.

Cada vez que pulse el botón BASS, el tono cambiará de la

forma siguiente:

Inerte la clavija de auriculares en el enchufe

Empuje completamente hacia adentro la clavija.

– 9 –

MD-MT15/15C/15H/15W/161E/18H

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) x7 10-1

2 Top Cabinet 1. Open the Top cabinet. 10-1

3 Key Switch/LCD 1. Flexible PWB......... (C1) x2 10-2

4 Mechanism Unit 1. Flexible PWB......... (D1) x2 10-2

5 Main PWB 1. Flat cable................(E1) x1 10-2

6 Audio PWB

PROCEDURE

2. Screw .....................(B1) x4

3. Screw .....................(B2) x1

2. Raise the rear part, and ..... 10-3

remove in the arrow direction.

2. Screw .....................(E2) x2

Screw ......................(F1) x3 10-4

FIGURE

(A1)x2

ø1.4x2mm

Open Lever

ø1.4x2mm

(E2)x2

ø1.7x2.5mm

Main PWB

(B1)x2

ø1.4x2mm

OpenOpen

(B2)x1

pull

LCD

Key Switch

Top Cabinet

(A1)x2

ø1.4x2mm

Bottom

Cabinet

Figu re 10-1

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

(D1)x1

pull

(A1)x1

ø1.4x2mm

(B1)x2

ø1.4x2mm

(A1)x2

ø1.4x2mm

Felt

(D1)x1* Flexible PWB for optical pickup

Audio

PWB

(F1)x3

ø1.7x2.5mm

(C2)x2

Mechanism

(E1)x1

Unit

LCD

Key Switch

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.

Figure 10-2

Mechanism Unit

Audio PWB

Figure 10-4

Figure 10-3

– 10 –

+ 22 hidden pages

SHARP MDMT15 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual