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MD-MT20/20C/20W

SERVICE MANUAL
No. S6943MDMT20//

Illustration: MD-MT20/20C

MD-MT20(S) MD-MT20C(S) MD-MT20W(BL) MD-MT20W(GL) MD-MT20W(S)
ˇ 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-MT20W

CONTENTS
Page SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT20W ONLY).............................................................................. 2 SPECIFICATIONS ................................................................................................................................................................. 3 NAMES OF PARTS ............................................................................................................................................................... 4 OPERATION MANUAL .......................................................................................................................................................... 5 QUICK GUIDE (MD-MT20 ONLY) ......................................................................................................................................... 8 DISASSEMBLY .................................................................................................................................................................... 10 REMOVING AND REINSTALLING THE MAIN PARTS ....................................................................................................... 11 ADJUSTMENT ...................................................................................................................................................................... 12 NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 25 TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 25 VOLTAGE ............................................................................................................................................................................ 26 BLOCK DIAGRAM ............................................................................................................................................................... 27 SCHEMATIC DIAGRAM ...................................................................................................................................................... 28 WIRING SIDE OF P.W.BOARD ........................................................................................................................................... 31 WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 36 TROUBLE SHOOTING ........................................................................................................................................................ 37 FUNCTION TABLE OF IC .................................................................................................................................................... 40 CIRCUIT DESCRIPTION ..................................................................................................................................................... 42 PARTS GUIDE/EXPLODED VIEW PACKING OF THE SET (MD-MT20 ONLY)

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-MT20/20C/20W

SAFETY PRECAUTION FOR SERVICE MANUAL (MD-MT20W 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.

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 adjustment as this may result in exposure to hazardous radiation. 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

VARO ! VARNING!

Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen. 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

Magnet Head

Laser Beam

Mechanism Chassis
Top Cabinet Optical pick-up

Spindle motor

Main PWB Optical Pick-Up

Figure 2-1 2

Figure 2-2

MD-MT20/20C/20W
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.

SPECIFICATIONS
MD-MT20/20C
s General
Power source: DC 2.4V: DC 5V: DC 3.0V: DC 4.5V: Rechargeable Nickel-Metal Hydride battery (ADT20BT) x 1 AC adaptor (AC 120V, 60 Hz) Commercially available, "AA" size (LR6), alkaline battery x 2 Separately available car adaptor, AD-CA20X (for cars with a 12-24V DC negative ground electrical system)

MD-MT20W
General
Power source: DC 2.4V: DC 5V: DC 3.0V: DC 4.5V: Rechargeable Nickel-Metal Hydride battery (ADT20BT) x 1 AC adaptor (AC 110 - 240V, 50/60 Hz) Commercially available, "AA" size (LR6), alkaline battery x 2 Separately available car adaptor, AD-CA20X (for cars with a 12-24V DC negative earth electrical system)

Power consumption: Output power: Charging time:

7.5W(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)
When using the rechargeable battery (fully charged) included with the unit Continuous recording: Approx. 7.5 hours Continuous play: Approx. 12 hours When using two, commercially available, high capacity, "AA" size (LR6), alkaline batteries Continuous recording: Approx. 7.5 hours Continuous play: Approx. 15 hours

Power consumption: Output power: Charging time:

0.15A (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)
When using the rechargeable battery (fully charged) included with the unit Continuous recording: Approx. 7.5 hours Continuous play: Approx. 12 hours When using two, commercially available, high capacity, "AA" size (LR6), alkaline batteries Continuous recording: Approx. 7.5 hours Continuous play: Approx. 15 hours

Battery life:

Battery life:

q The continuous recording time is for analog inputs when the volume level is set to "VOL 0". q The continuous play time shows the value when the volume level is set to "VOL 15". q The above values are the standard values when the unit is charged and used at an ambient temperature of 68°F (20°C). q The operating 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 MIC H MIC L LINE Output level: Headphones LINE Dimensions: Reference input level Input impedance 0.25 mV 2.5 mV 100 mV 10 k ohms 10 k ohms 20 k ohms

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 charged and used at an ambient temperature of 20°C (68°F). The operating time when using an alkaline batteries may be different, depending on the type and manufacturer of the battery, and on the operating temperature. Input sensitivity: Recording level MIC H MIC L LINE Output level: Earphones LINE Dimensions: Reference input level Input impedance 0.25 mV 2.5 mV 100 mV 10 k ohms 10 k ohms 20 k ohms

Specified output -- 250 mV (-12dB)

Maximum output level 10 mW + 10 mW --

Load impedance 16 ohms 10 k ohms

Specified output -- 250 mV (-12dB)

Maximum output level 10 mW + 10 mW --

Load impedance 32 ohms 10 k ohms

Width: 3-7/16" (87.9 mm) Height: 1-3/16" (29.8 mm) Depth: 3-1/8" (79.7 mm) 0.52 lbs. (235 g) with rechargeable battery Line/optical digital, microphone (powered by the main unit) Headphones (impedance: 19 ohms)/remote control unit

Width: 87.9 mm (3-7/16") Height: 29.8 mm (1-3/16") Depth: 79.7 mm (3-1/8") 235 g (0.52 lbs.) with rechargeable battery Line/optical digital, microphone (powered by the main unit) Earphones (impedance: 32 ohms)/remote control unit

Weight: Input jack: Output jack:

Weight: Input socket: Output socket:

s MiniDisc Recorder
Type: Signal readout: Audio channels: Frequency response: Rotation speed: Error correction: Coding: Recording method: Sampling frequency: Wow and flutter: Portable MiniDisc recorder Non-contact, 3-beam semi-conductor laser pick-up Stereo 2 channels/monaural (long-play mode) 1 channel 20 20,000 Hz (ą 3 dB) Approx. 400 900 rpm ACIRC (Advanced Cross Interleave Reed-Solomon Code) ATRAC (Adaptive Transform Acoustic Coding), 24-bit computed type Magnetic modulation overwrite method 44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz, and then recorded.) Unmeasurable (less than ą0.001% W. peak)

MiniDisc Recorder
Type: Signal readout: Audio channels: Frequency response: Rotation speed: Error correction: Coding: Recording method: Sampling frequency: Wow and flutter: Portable MiniDisc recorder Non-contact, 3-beam semi-conductor laser pick-up Stereo 2 channels/monaural (long-play mode) 1 channel 20 20,000 Hz (ą 3 dB) Approx. 400 900 rpm ACIRC (Advanced Cross Interleave Reed-Solomon Code) ATRAC (Adaptive Transform Acoustic Coding), 24-bit computed type Magnetic modulation overwrite method 44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz, and then recorded.) Unmeasurable (less than ą0.001% W. peak)

Specifications for this model are subject to change without prior notice

3

MD-MT20/20C/20W
Main 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

NAMES OF PARTS
Illustration: MD-MT20/20C

1 2 3 4 5 6 7 11 12 13 14 15 17 16 21 18 19 20 8 9 10

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

22 23 24 25 26 27 28

29
29. Open Lever 30. Remote Control/Earphones Socket 31. Optical/Line Input Socket 32. Microphone Input Socket

30 31 32 33 34 35

33. Hold Switch 34. 5V DC Input Socket 35. Battery Cover

Remote control unit
1. Headphones Jack (MD-MT20/20C) 1. Earphones Socket (MD-MT20W) 2. Fast Reverse/Recording Level Down/ Name Select Button 3. Hold Switch 4. Play/Pause Button 5. Fast Forward/Recording Level Up/ Name Select Button 6. Stop/Power Off Button 7. Volume Up/Cursor Button 8. Bass/Delete/Track Mark Button 9. Volume Down/Cursor Button
4

1 4 2 5 6 7 8 9

3

POWER SOURCE

RECORDING USING THE OPTICAL DIGITAL CABLE

This unit can be used with the following power sources: a rechargeable battery, an AC adaptor, commercially available alkaline batteries, and a separately available car adaptor (AD-CA20X).

1

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.

This is the method used for recording digital signals from CDs or MDs exactly as they are stored on the original. Compared to recordings made from analogue inputs, digital recordings have extremely high-quality sound. There are cases where digital recording may be impossible. In the following cases digital recording is impossible, even if you are using digital cables.

1 Open the battery cover.

1 Connect the external equipment. 2 Start recording.
Synchro recording: Playback

2

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 being slid all the way out, it may break.

2 Insert the rechargeable battery accord-

ing to the polarity marked on the bottom of the unit.

When you attempt to make a new digital recording from a track that was digitally recorded 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). Digital cable Recording

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

3

and then insert the plug on the AC adaptor lead into the DC IN 5V socket.

5 Press the CHARGE (VOLUME down)

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.

CD player, MD player, etc.

OPERATION MANUAL

5

Digitally recorded MiniDisc

4

5

(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, i t is not necessary to adjust the recording level.

MD player

Playback

Digital cable

Recording Analogue recording is possible.

button of the main unit to begin charging. " " will appear, and the battery will begin charging. After about 4 hours have passed, " " will go out. This indicates that the battery charging is about 90% compleate. To charge the battery fully, continue charging for about 2 more hours. (In this case, you do not need to press the CHARGE button. Even if the CHARGE button is pressed, " " will not appear.)

To the DC IN 5V socket

Insert securely, all the way in. For MD-MT20W

AC 110-240V, 50/60 Hz

To the DC IN 5V jack

MD-MT20/20C/20W

AC 120V, Insert securely, all the way in. 60 Hz For MD-MT20/20C

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 open the battery cover too wide. Do not use a rechargeable battery or an AC adaptor other than those specified (ACCESSORIES). 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. charging and discharging. To avoid shortening the service life of the battery only recharge the battery after it has been completely discharged.

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 sampling frequency (32 kHz or 48 kHz), recordings can still be made. (The sampling 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.

CONVENIENT OPERATION OF THE UNIT

Checking the remaining amount of battery level

To prevent the unit from being operated by mistake

Many potential "problems" can be resolved by the owner without calling a service technician. If something seems to be wrong with this product, check the following before calling your authorised SHARP dealer or service centre. PROBLEM CAUSE

The remaining amount of battery level is shown by the battery indicator ( ) during operation. Battery indicator

To avoid accidental operation of the unit, use the hold function.

Move the HOLD switch to the safety position (direction indicated by the arrow).

MD-MT20/20C/20W

When the unit is in the hold mode, pressing the buttons will have no affect.

The unit does not turn on.

< How to read the battery indicator >

When the battery level is high

When the battery level is very low

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 remote control unit or 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 remote control unit plug or the earphone plug inserted firmly? 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?

No sound is heard from the earphones.

Since the battery level is very low, you cannot start recording or editing.

To cancel the hold mode, move the HOLD switch away from the safety position (the opposite direction of the arrow).
Remote control unit Main unit

When the operation buttons are pressed, the unit does not respond. Some sounds are skipped. The MiniDisc cannot be ejected.

When the battery is completely discharged, the battery indicator will flash. Recharge the battery or replace the alkaline batteries with a new one. When the battery has run completely out, "BATT EMPTY" will appear. Then, the power will be disconnected automatically.
Cancel Cancel

6
Cancel Hold Cancel Hold

Can be operated from either the remote control unit or the main unit.

Can only be operated from the remote control unit.

Can only be operated from the main unit.

Recording and editing are impossible.

Notes: When using the unit with alkaline batteries or a rechargeable battery, the battery indicator will not correctly display the remaining 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, depending on the operation being performed. This is normal.
Hold Hold

Cannot be operated from either the remote control unit or the main unit.

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.

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 occur whilst recording or editing? Is the unit in the hold mode? Is an optical signal being output from the external equipment? Read the operation manual for the external equipment.

If trouble occurs
4. Plug the AC adaptor back into the AC socket and retry the operation. When this product is subjected to strong external interference (mechanical shock, excessive static electricity, abnormal supply 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. 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.

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.

MINIDISC SYSTEM LIMITATIONS
Error messages
q The battery is run down. q Nothing is recorded. q No copy can be made because of the SCMS copyright system. q A track cannot be edited.

ERROR MESSAGES
Meaning Remedy
q Charge the rechargeable battery or replace the alkaline battery (or use the AC adaptor for power). q Replace the disc with a recorded disc. q Record using the analog cable. q Change the stop position of the track and then try editing it. q Re-record or replace it with another recordable disc.

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.
BATT EMPTY (Lo BATT) BLANK DISC (BLANK) Can't COPY (Not REC) Can't EDIT Can't REC (Not REC) Can't WRITE DEFECT (DEFECT) Din UNLOCK (UNLOCK) DISC FULL HOLD (HOLD) LOCKED LOCK ERROR NO DISC PB DISC POWER ?
q The unit is in the hold mode. q Poor connection of the digital cable. q The disc is out of recording space. q Recording cannot be performed correctly due to vibration or shock in the unit. q Editing is impossible. q The disc is scratched.

Even if the maximum recording time of a MiniDisc has not been reached, "DISC FULL" or "TOC FULL" may be displayed.

When the number of tracks used reaches the limit, regardless of the remaining recording time, further recording will be impossible. (Maximum number of tracks: 255) If a MiniDisc has been recorded or edited repeatedly or if a MiniDisc has scratches on it, it may not be possible to record the maximum number of tracks on it.

q Check the number of tracks. q If the sound you hear is not right, try recording again. q Replace the disc with another recordable disc. q Connect the digital cable securely. q Replace it with another recordable disc. q Return the HOLD switch to its original position. q Turn off the power and remove the MiniDisc. q Load a disc. q Replace it with a recordable disc.

Even if the number of tracks and the recording time have not reached the limit, "DISC FULL" may be displayed.

If there are scratches on a disc, the unit will automatically avoid recording in those areas. The recording time will be reduced.

Even if several short tracks are erased, the remaining recording time may not show an increase.

When the remaining recording time of a disc is displayed, short tracks less than 12 seconds long may not be included in the total.

7
PROTECTED READ ERROR (E-READ) SORRY (SORRY) SYSTEM ERR (E-SYS) TEMP OVER (E-TEMP) TOC ERROR (E-TOC) TOC FULL Tr. Protect U TOC ERROR (E-UTOC) ? DISC (?DISC)

q The EJECT lever was moved during recording or editing. q A disc has not been loaded. q You tried to record on a playback- only disc. q Improper power is being supplied. q The MD is write protected. q You tried to record without loading an MD. q A playback-only MD was loaded and the REC button was pressed when the power was off. q The disc is damaged.

Two tracks may not be combined in editing.

For MiniDiscs on which repeated recording and editing operations were performed, the COMBINE function may not work.

q Use one of the specified power sources. q Move the write protection knob back to its original position. q Load a recordable MD. q Replace it with a recordable MD. q Reload the disc or replace it. q Replace it with another recorded disc. q Wait for a while and try the operation again. q Since a track number is currently being located or written to, the unit cannot accept your command. q You have come to the conclusion that the unit is out of order. q The temperature is too high. q To have it repaired, go to the distributor where you purchased the unit. q Turn off the power, and wait for a while. q Replace it with another recorded disc. q Replace it with another recordable disc. q Edit the track with the device on which it was recorded. q Replace it with another recorded disc. q Erase all of the signal errors, and then try recording again. q A disc which contains non-music data cannot be played. q Replace it with another recorded disc.

The total of the recorded time and time remaining on a disc may not add up to the maximum possible recording time.

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 recording may be less than the remaining time displayed. If there are scratches on discs, those sections will be automatically avoided (no recording will be placed in those sections). Therefore, the recording time will be reduced.

When recorded tracks are played back using the cue and review operations, some sounds may be skipped.

For MiniDiscs on which repeated recording and editing were performed, some sounds may be skipped whilst cueing and reviewing.

A track number can be created in the middle of a track.

MD-MT20/20C/20W

If there are scratches or dust on a MiniDisc, the track numbers following that track will be increased by one.

q A large portion of the disc has been damaged. q There is no space left for recording character information (track names, disc names, etc.). q The track has been protected from being erased. q A large portion of the disc has been damaged. q There is an error in the recorded signal. q A disc which contains data other than music was played. q There is an error in the signal from the disc.

(

): Error messages seen on the remote control.

PORTABLE MINIDISC RECORDER Quick Guide/Guía rápida MD-MT20
s Analog recording s Grabación analógica
Playback side Lado de reproducción

3 Connection / Conexión
Recording side Lado de grabación AUDIO OUT

1 Check the supplied accessories / Compruebe los accesorios suministrados
R
(RIGHT) (DERECHO) (LEFT) (IZQUIERDO)

L
OPTICAL/ LINE IN

MD-MT20/20C/20W

q Remote Control Unit x1 q Controlador remoto x1 q Rechargeable NickelMetal Hydride Battery x 1 q Batería recargable de litio-ion x 1

q Headphones x 1 q Auriculares x 1

q AC Adaptor x 1 q Adaptador de CA x 1

ˇ To the line output jacks on a stereo ˇ A los enchufes de salida de línea de un equipo estéreo ˇ Analog cable included with this unit ˇ Cable analógico suministrado con este

q Analog Cable x 1 q Cable analógico x 1

q Optical Digital Cable x1 q Cable óptico digital x1

q Carrying Bag x 1 q Caja para el transporte x 1

q Battery Carrying Case x1 q Caja portabaterías x 1

s Digital recording s Grabación digital
Recording side Lado de grabación

2 Power source / Alimentación
4 5
Playback side Lado de reproducción

s Rechargeable battery power s Alimentación de la batería recargable

1

2

3

OPTICAL/ LINE IN

OUICK GUIDE (MD-MT20 ONLY)

8
DIGITAL OUT

ˇ Optical digital cable (supplied) ˇ Cable óptico digital (suministrado)

ˇ AC 120V, 60Hz ˇ 120V CA, 60Hz

s Alkaline battery power s Alimentación de la pila alcalina

1 3

2

s Microphone s Micrófono
Stereo microphone Micrófono estéreo

Recording side Lado de grabación

sAC power s Alimentación de CA

MIC IN

PLUG IN POWER

ˇ AC 120V, 60Hz ˇ 120V CA, 60Hz

4 Recording / Grabación
3
Press the REC button.

5 Playing a MiniDisc / Reproducción de un minidisco
Pulse el botón REC.
2 4 Playback does not start when a MiniDisc is inserted: La reproducción no empieza cuando se inserta un minidisco: Press the button. In the following cases, the auto-play function will not work. q When the recordable MiniDisc write protection tab is closed q When the auto-play function has been canceled

s Recording from CDs or MDs (Synchro recording) s Grabación de discos compactos o minidiscos (Grabación sincronizada)

4
While playing sound from the external equipment connected to this unit, press the or button to adjust the recording level.
1 3 Insert the headphones plug firmly into the headphones jack on the remote control unit.

1
Mientras se produce el sonido del equipo externo conectado a este aparato, pulse el botón o para ajustar el nivel de grabación.

Connect the external equipment.

Conecte el equipo externo.
Inserte firmemente la clavija de los auriculares en el enchufe de auriculares del controlador remoto.

1 2
Plug the remote control unit into the jack on the main unit. Push the plug all the way in.

Pulse el botón . En los casos siguientes, la función de reproducción automática no se activará. q Cuando esté cerrada la lengüeta de protección contra escritura del minidisco grabable q Cuando haya sido cancelada la función de reproducción automática
To interrupt playback: Para interrumpir la reproducción: Press the button during playback. q To resume playback, press the button again.

Insert a recordable MiniDisc.

2 5
Press the ENTER/SYNC button.

Inserte un minidisco grabable. Pulse el botón ENTER/SYNC.
Begin playback on the source equipment.

2

4

6
Inicie la reproducción en el equipo fuente.
Enchufe el controlador remoto en el enchufe del aparato principal. Empuje completamente hacia adentro la clavija.

1

Pulse el botón durante la reproducción. q Para reanudar la reproducción, pulse de nuevo el botón

3

s Recording from the microphone (Mic synchro recording) s Grabación de un micrófono (Grabación sincronizada con micrófono)
Inserte un minidisco.

3
Insert a MiniDisc.

To stop playback: Para detener la reproducción: Press the s/:OFF button. Pulse el botón s /:OFF. To turn off the power: Para desconectar la alimentación: Press the s/:OFF button while in the stop mode. Pulse el botón s /:OFF estando en el modo de parada.

9

6
When a sound, such as a person speaking, is picked up by the microphone, recording will begin automatically. Cuando el micrófono capte un ruido, el de una persona que hable por ejemplo, la grabación empezará automáticamente. To stop recording: Para detener la grabación: Press the s/:OFF button. Pulse el botón s/:OFF. To turn off the power: Para desconectar la alimentación: Press the s/:OFF button while in the stop mode. Pulse el botón s/:OFF estando en el modo de parada. To remove the MiniDisc: Para extraer el minidisco:

q The power will be turned on automatically, and playback will start from the first track. (Auto-play function) q La alimentación se conectará automáticamente, y la reproducción empezará desde la primera pista. (Función de reproducción automática)

1

Connect the stereo microphone to the MIC IN jack. Conecte el micrófono estéreo al enchufe MIC IN del aparato principal.

6 Sound control / Control del sonido
Adjust the volume. Press the + button to increase the volume and the button to decrease the volume.

2

Insert a recordable MiniDisc. Inserte un minidisco grabable.

3
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.
2

Press the REC button.

Pulse el botón REC.

Ajuste el volumen. Pulse el botón + para aumentar el volumen y el botón para reducirlo.

Adjust the bass level. Each time the BASS button is pressed, the tone will be switched as follows: Ajuste el nivel de los graves. Cada vez que pulse el botón BASS, el tono cambiará de la forma siguiente:

4

Press the or recording level.

button to adjust the

Pulse el botón de grabación.

o

para ajustar el nivel

. 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 emphasiz is canceled.

5
1

ˇ Volume (0 - 30) ˇ Volumen (0 - 30)

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.

MD-MT20/20C/20W

Press the ENTER/SYNC button to select the synchro recording level. (This level can be changed, even while recording.) Pulse el botón ENTER/SYNC para seleccionar el nivel de la grabación sincronizada. (Este nivel podrá cambiarse incluso durante la grabación.)

3

BASS OFF ---- El realce de los graves se cancela.

MD-MT20/20C/20W

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 1 2 REMOVAL Bottom Cabinet Top Cabinet PROCEDURE 1. Screw ..................... (A1) x7 1. Open the Top cabinet. 2. Screw ..................... (B1) x4 3. Screw ..................... (B2) x1 1. Flexible PWB ......... (C1) x2 FIGURE 10-1 10-1
Put the fold on the connector, and apply with the felt. Sagging may result in contact with the sheet metal. Felt

(B1)x2 ř1.4x2mm (A1)x2 ř1.4x2mm Open

LCD Key Switch Top Cabinet (A1)x1 ř1.4x2mm

Open Lever (B1)x2 ř1.4x2mm (B2)x1 ř1.4x2mm Bottom (A1)x2 ř1.4x2mm Cabinet (A1)x2 ř1.4x2mm

Figu re 10-1

3 4

Key Switch/LCD Mechanism Unit

10-2

1. Flexible PWB ......... (D1) x2 10-2 2. Raise the rear part, and ..... 10-3 remove in the arrow direction. 1. Flat cable ................ (E1) x1 2. Screw ..................... (E2) x2 1. Screw ...................... (F1) x3 10-2 10-4

(E2)x2 ř1.7x2.5mm Main PWB

(D1)x1

5 6

Main PWB Audio PWB

pull pull pull pull pull pull pull pull

(D1)x1* Flexible PWB for optical pickup Audio PWB

(C2)x2 LCD

(E1)x1

Mechanism Unit

Key Switch

(F1)x3 ř1.7x2.5mm

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 10 Figure 10-3

MD-MT20/20C/20W

REMOVING AND REINSTALLING THE MAIN PARTS
Remove the mechanism according to the disassembling methods 1 to 4. (See Page 10.)
(A2)x3 ř1.4x2.8mm Spindle Motor (A1)x1 Mechanism Flexible PWB Solder joint

How to remove the spindle motor (See Fig. 11-1.)
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 head up/down motor (See Fig. 11-2.)
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.)
MD Mechanism

Figure 11-1
Remove the solder joint (B1)x2 Head Up/Down Motor (B3)x1 ř1.4x5.5mm (B2)x1 ř1.4x1.5mm

How to remove the sled motor (See Fig. 11-3.)
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.)

MD Mechanism

Figure 11-2
(C1)x1 Stop Washer (C2)x1 Drive Gear (C3)x2 ř1.4x1.2mm Sled Motor (C4)x2 Mechanism Flexible PWB Solder Joint

How to remove the magnetic head (See Fig. 11-4.)
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.)

MD Mechanism

How to reinstall the optical pickup unit (See Fig. 11-5.)
1. Remove the screw (E1) x 1 pc. 2. Slowly raise the optical pickup.
Guide Shaft Optical Pickup Unit (E1)x1 ř1.7x3mm Thrust Plate Spring

Figure 11-3
(D1)x2 ř1.4x2.2mm Magnetic Head (D3)x2 (D1)x1 Solder joint ř1.4x1.5mm (D1)x1 ř1.2x1.6mm (D2)x2 Spring Washer

MD Mechanism

MD Mechanism

Figure 11-5 11

Figure 11-4

MD-MT20/20C/20W

ADJUSTMENT
Test disc
MD adjustment needs two types of disc, namely recording disc (low reflection disc) and playback-only disc (high reflection disc).
Type 1 2 3 4 Test disc Parts No. 88GMMD-110 88GMMD-212 88GMMD-213A UDSKM0001AFZZ

High reflection disc MMD-110 (TEAC Test MD) Low reflection disc Low reflection disc Low reflection disc MMD-212 (TEAC Test MD) 74-minute disc MMD-213A (TEAC Test MD) 80-minute disc Recording minidisc

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 STOP [ 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 [ 3 1 8 A f X ] Destination EEPROM version (4) Whole LCD lighting for 2 seconds (5) Test Mode STOP [ T E S T _ ] *When the PLAY button is pressed during indication (3) and (4), the process proceeds to (5). Microcomputer version

Leaving the TEST mode
(1) Press the STOP button in the TEST mode stop state or version indicating state or whole LCD lighting 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 ˇ Perform preliminary automatic adjustment. ˇ If the combination of mechanism and pickup PWB has been changed, be sure to start from AUTO1. ˇ Perform ATT (attenuator) automatic adjustment. ˇ Perform continuous playback (error rate display, jump test) ˇ Continuous playback from the specified address is performed. ˇ 1 line, 10 lines or 384 lines manual jump is performed. ˇ C1 error rate display (pit section), ADIP error rate display (groove section) ˇ The temperature correction is performed only when servo start is performed, but the posture correction is not performed during continuous playback. ˇ Continuous record from the specified address is performed. ˇ Change of record laser output(servo gain is also changed according to laser output). ˇ The temperature correction is performed only when servo start is performed, but the posture correction is not performed during continuous recording. ˇ Temperature is displayed. (Updating in real time) ˇ Seeing the displayed adjustment value, perform preliminary manual adjustment. (Error rate indication, jump test) ˇ Temperature is displayed. (Updating in real time) ˇ Seeing the displayed adjustment value perform manfully the preliminary adjustment. (Error rate indication, jump test) ˇ Continuous playback is performed (error rate display, jump test). ˇ The value adjusted in AUTO1 or MANUAL1 is indicated. ˇ (Execution in servo "OFF" state"). 8. RESULT 2 Mode ˇ The value adjusted in AUTO 2 or MANUAL 2 is indicated. ˇ Adjustment value is changed manually. (error rate display, jump test). 9. DIGITAL INPUT Mode ˇ Digital input information is displayed. 10. ERROR INFORMATION ˇ Error information is displayed. Mode ˇ Error information is initialized 11. NORMAL Mode ˇ The mode is changed from the TEST mode to the normal mode without adjustment. ˇ In the normal mode the internal operation mode, memory capacity, etc. areindicated. ˇ In the normal mode both temperature correction and posture correction are perfomed. 12. EEPROM Mode ˇ Factors of digital servo are changed manually. (Each servo is turned on individually.) ˇ Cut-off frequency of BASS1, BASS2 and BASS3 is selected manually. ˇ Temperature detection terminal voltage is measured, and the reference value is set. ˇ Defaults are selected and set. ˇ Setting of EEPROM protect area is updated. (In case of protect releasing) 13. INNER Mode ˇ Determine the position where the INNER switch is turned on. (only high reflection disc). ˇ The temperature correction is performed only when servo start is performed, but the posture correction is not performed. 7. RESULT 1 Mode

2. AUTO 2 Mode

3. TEST-PLAY Mode

4. TEST-REC Mode

5. MANUAL 1 Mode

6. MANUAL 2 Mode

12

MD-MT20/20C/20W Operation in each TEST mode
1. AUTO1 Mode
ˇ 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. ˇ 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.) ˇ Adjustment NG; Adjustment item out of range, focus ON failure, and adjustment error ˇ When the PLAY button is pressed while ADJ. OK is displayed, AUTO2 is executed.

2. AUTO2 Mode
ˇ 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. ˇ Adjustment NG; Adjustment item out of range, and adjustment error. ˇ When the PLAY button is pressed while ADJ. OK is displayed,TEST_PLAY is executed.

3. TEST-PLAY Mode
ˇ 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. ˇ When the PLAY button is pressed while the TEST-PLAY menu appears,continuous playback is initiated from the current pickup position. ˇ Whenever the DISP button is pressed in the TEST-PLAY 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. ˇ 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. 0032 -- 0032 -- 0032 -- 0032 -- ˇ 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) ˇ 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. ˇ When the BASS button is pressed in the continuous playback mode, the number of jump lines changes as follows. 1 -- 10 -- 384 -- 1 * After the number of jump lines is indicated for one second, the address indication is restored. [ T R _ ] ˇ When the SKIP UP button is pressed in the continuous playback mode, the specified number of lines is jumped in the FWD direction. ˇ 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. ˇWhenever the DISP button is pressed in the continuous playback mode, the indication changes as follows. * Pre-mastered disc Continuous playback (SUBQ address indication) [ S Q ] | Continuous playback (C1 error indication) [ C E ] | Continuous playback (SUBQ address indication) [ S Q ] * Recordabl disk 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
ˇ 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. ˇ When the PLAY button is pressed while the TEST-REC menu appears, the continuous record is initiated from the current pickup position. ˇ 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. ˇ 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 --
ˇ 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) ˇ 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.

13

MD-MT20/20C/20W
5. NORMAL Mode
ˇ When the STOP button is pressed while the NORMAL menu appears, the mode changes to the TEST mode stop state. ˇ Indication during operation Indication of memory capacity on main unit LCD [ ] + Level meter : Internal mode : Address (Cluster section) : Address (Sector section) ˇ Selection of sound volume, BASS, etc. is possible (without indication) ˇ Recording is also possible. ˇ 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
ˇ Reversing when SKIP DOWN button is pressed ˇ 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. ˇ Error data 0 is the latest error. ˇ Error which occurred in the TEST mode is also stored in the memory. ˇ 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 ˇ

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 temperature.

7. INNER Mode
ˇ when the STOP button is pressed on the INNER menu (SQ______ ), the state is changed to the TEST mode STOP state. ˇ : Address

14

MD-MT20/20C/20W EEPROM (IC402) writing procedure
1. Procedure to replace EEPROM and write initial value of microcomputer in EEPROM
(1) (2) (3) (4) (5) Replace EEPROM. Deprive EEPROM of protection (connect the pins 8 and 6 of IC402). Refer to the latest EEPROM data list. Press the Display button, Ente button and Play button to start the test mode. Version display [Ver. X ] EEPROM version (f ~ Z) Microcomputer ROM version (6) The whole LCD lights. (7) Test mode stop state. [ T E S T ] (8) Press the "BASS" button, and press twice the "SKIP DOWN" button. [ E E P R O M ] (9) 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. (10) Set the temperature reference. (Refer to the Temperature Reference Setting Method.) (11) Set according to the EEPROM DATA LIST. (12) Press the Stop button. [ T E S T ] (13) Press the Stop button. (14) After data is written in EEPROM, turn off power . (15) Restore protection of EEPROM (Disconnect connection made in Step (2) above).

2. Temperature reference setting method
[1] Measurement, calculation and setting procedure (1) Set the TEST mode. ˇ Set TEST 1, 0 = '01', and turn on power (or set PLAY ON in standby state). (2) Start the EEPROM mode 'Temp' menu. ˇ Key operation in order of BASS, SKIP-DOWN x 2 times, PLAY, PLAY in the test mode STOP state. ˇ 'TM$$%%' is displayed. ($$= Temperature code, %% = Temperature reference) (3) Once press SKIP-UP, and determine the displayed microcomputer TEMP input AD value.
ˇ '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.
ˇ 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 +12 C ~ +14 C +15oC ~ +16oC +17oC ~ +19oC +20oC ~ +22oC +23oC ~ +24oC +25oC ~ +27oC +28oC ~ +30oC +31oC ~ +33oC
o o

Temperature correction - 05h - 04h - 03h - 02h - 01h ą 00h + 01h + 02h + 03h

Center temperature + 10.0oC + 12.7 C + 15.4oC + 18.2oC + 20.9oC + 23.6oC + 26.3oC + 29.0oC + 31.8oC
o

Ambient temperature - 9oC ~ +10oC + 3oC ~ +21oC +15oC ~ +33oC +26oC ~ +43oC

Temperature correction 08h 07h 06h 05h

Center temperature + 0.5oC + 12.5oC + 23.6oC + 35.0oC

15

MD-MT20/20C/20W EEPROM DATA LIST (EEPROM version f)
TEMP setting
Item display
T M _ _

Sled setting
Set values
Calculate values S L G _ S L 2 _ S L M _

Item display

Set values
DF 20 7F D7 72 70 78 24 4F AA 0A
H H H H H H H H H H H

Fucus setting
Item display
F G _ _ F F 1 _ F F 2 _ F Z H _ F L n _ D J G _ F L V _ W T f _ F S S _

Set values
B0 70 E8 ED 0A 14 33 20 E9
H H H H H H H H H

S L V _ S K k _ S K t _ S K m _ W T m _ M V 1 _ M V 2 _ S R V _

ADJ. SET setting
Item display Set values
A0 C0 3E 20 E0
H H H H H

Tracking setting
Item display
T G _ _ T F 1 _ T F 2 _ T F S _ T B o _ T B t _ T K o _ T K t _ T D o _ T D t _ T G R _ S C t _ S C m _ C L p _ C L r _ J P I _ K 1 0 _

C O K _ F A T _

Set values
48 70 E0 00 44 20 44 67 34 00 40 53 18 28 01 65
H H H H H H H

T A T _ C A T _ F A B _

EQ. SET setting
Item display
H Q 1 _ H Q 2 _ H S G _ H S O _ L Q 1 _ L Q 2 _ L S G _ L S O _ G Q 1 _ G Q 2 _ G S G _ F L p _

Set values
90 90 11 FD 90 90 11 00 98 84 11 08
H H H H H H H H H H H H

1DH
H H H H H H H H H

Spindle setting
Item display
S P G _ S P i _ S P m _ S P o _ S P 1 _ S P 2 _ S P 3 _ S P 4 _ S P 5 _ S P D _ S P K _

Set values
14 E0 A0 68 10 60 F2 F2 10 7F EB
H H H H H H H H H H H

Control setting
Item display
C T 0 _ C T 1 _ C T 2 _ C T 3 _ R C 0 _ R C 1 _ S Y C _ P W L _ D R 1 _ D R 2 _ I N 1 _ I N 2 _

Set values
05 11 7F 30 C0 FE A6 03 92 C8 D3 64 D2 64 C8 1B 42 76 43 00 00 00 00 00
H H H H H H H H H H H H H H H H H H H H H H H H

BASS setting
Item display
B S 1 _ B S 2 _ B S 3 _

I N 3 _

Set values
3F 1F E2
H H H

I N H _ D R H _ P L E _ R C E _ E L T _ S L T _ S P M _ M S L _ U S 0 _ U S 1 _ U S 2 _

16

Test Mode Change Chart Tset Mode Menu

Preautomatic Adjustment AUTO1
: Preautomatic Adjustment menu PLAY

TEST

: Test Mode STOP

SKIP UP

SKIP DOWN

AT1
: During preadjustment adjustment Adjustment error Normal end

Slide external periphery move

Slide internal periphery move

BASS

ADJ. NG

: Preadjustment error (adjustment value output) : Preadjustment normal end (adjustment value output)

SKIP DOWN

AUTO1
PLAY

: Pre-auto adjustment menu

ADJ. OK AT2

SKIP UP

SKIP DOWN

AUTO2

: ATT auto adjustment menu

: During ATT automatic adjustment

SKIP UP

SKIP DOWN

T

PLAY

: Pre-manual adjustment menu

SKIP UP

SKIP DOWN

T

REC

: ATT manual adjustment menu

SKIP UP

SKIP DOWN

MANU1

: Pre-adjustment value check menu

SKIP UP

SKIP DOWN

17

MANU2

: ATT adjustment value check menu

SKIP UP

SKIP DOWN

RSLT1

: Continuous playback menu

SKIP UP

SKIP DOWN

RSLT2

: Continuous record menu

SKIP UP

SKIP DOWN

Din Mon

: Test mode normal playback menu

* 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

SKIP UP

SKIP DOWN

E

DATA

: Digital input signal monitor menu

SKIP UP

SKIP DOWN

NORMAL

: Error history display menu

SKIP UP

SKIP DOWN

EEPROM

: EEPROM setting menu

SKIP UP

SKIP DOWN

INNER

: INNER switch position measurement menu

SKIP UP

MD-MT20/20C/20W

* 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.

ATT Auto Adjustment
ˇ Continuous playback from current pickup position

Continuous Playback T
: Continuous playback menu PLAY

AUTO2
PLAY SQ#### AP####

: ATT Autoadjustment menu

PLAY

AT2

: During ATT autoadjustment

Adjustment error

MD-MT20/20C/20W

Normal end

ADJ. NG
T
: Continuous playback menu DISP

: ATT adjustment error (adjustment value output)

: Continuous playback (pit section) : Continuous playback (groove section) # # # # : Address ˇ Continuous playback from any address

PLAY
: Start address setting

ADJ. OK
Ad 0 0 3 2
PLAY

: ATT adjustment normal end (adjustment value output)

PLAY

SQ#### AP####
SQ#### AP####

: Continuous playback (high reflection) : Continuous playback (low reflection)

: Continuous playback (pit section) : Continuous playback (groove section) # # # # : Address

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * In the start address set state the start address changes as follows when the [DISP] button is pressed. 03C0H 0700H 0 0 3 2 H (initial value) 08A0H
DISP DISP DISP

Ad0 0 3 2

Ad0 3 C 0

Ad0 7 0 0 Ad1 9 5 0 H
0950H

Ad0 8 A 0
DISP

18
MODE

* 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 3 : Pit section tracking ATT setting 0 4 : Pit section focus ATT setting 0 6 : External periphery move (low reflection only) 0 7 : TCRS ATT setting (low reflection only) 0 8 : Groove section tracking ATT setting (low reflection only) 0 9 : Groove section focus ATT setting (low reflection only)
MODE

* In the start address setting state the start address change digit changes when the [BASS] button is pressed. 1st digit (initial value) 2nd digit 3rd digit

Ad0 0 3 2

Ad0 0 3 2

Ad0 0 3 2
MODE

* In the start address set state the value of selection digit changes in the range of "0h to Fh" when the [SKIP UP/DOWN] button is pressed * In the continuous playback state the number of jump lines changes as follows shown the [BASS] button is pressed. 1 (initial value) 10 384
BASS BASS

1TR

10TR

3 8 4TR
BASS

* When the [SKIP UP] button is pressed in the continued playback mode, jump of specified number of lines occurs in the external periphery direction. If the key is held down jump occurs continuously (100 ms cycle). * When the [SKIP DOWN] button is pressed in the continuous playback mode, jump of specified number of lines occurs in the internal periphery direction. If the key is held down, jump occurs continuously (100 ms cycle).

Continuous Rrecord

Error History Display
ˇ Error history clear

ˇ Continuous record from the current pickup position

T

REC

: Continuous record menu

PLAY

E
: Error history display menu PLAY

DATA
: Error history clear

: Continuous record # # # #: Address ˇ Continuous record playback from any address

AP# # # #

CLEAR
ˇ Error history display

T

REC

: Continuous record menu

PLAY

E
PLAY

DATA
: Error history 0 display § § : Error code : Error history 1 display § § : Error code SKIP DOWN : Error history 2 display § § : Error code SKIP DOWN : Error history 3 display § § : Error code SKIP DOWN : Error history 4 display § § : Error code SKIP DOWN : Error history 5 display § § : Error code SKIP DOWN : Error history 6 display § § : Error code

: Error history display menu

Ad 0 0 3 2

: Start address setting

PLAY

E0§§
SKIP UP SKIP DOWN

AP# # # #

: Continuous record # # # #: Address

E1§§
SKIP UP

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * In the start address set state the start address changes as follows when the [DISP] button is pressed. 0 0 3 2 H (initial value) 03C0H 0700H 08A0H DISP DISP DISP

E2§§
SKIP UP

Ad0 0 3 2

Ad0 3 c 0

Ad0 7 0 0

Ad0 8 A 0

DISP

Ad1 9 5 0
SKIP UP
3rd digit MODE

E3§§ E4§§
SKIP UP

19

* In the start address setting state the start address change digit changes when the [BASS] button is pressed.

1st digit (initial value)

2nd digit

Ad0 0 3 2
MODE

MODE

Ad0 0 3 2

Ad0 0 3 2

E5§§
SKIP UP

Inner Switch Position Measurement
SKIP UP

E6§§
SKIP DOWN

INNER

: INNER switch position measurement menu

PLAY

E7§§
SKIP UP SKIP DOWN

: Error history 7 display § § : Error code

: Continuous playback (pit section) # # # # : Address * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set.

SQ####

E8§§
SKIP UP SKIP DOWN

: Error history 8 display § § : Error code

Test Mode Normal Playback

E9§§

: Error history 9 display § § : Error code * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set.

NORMAL

: TEST mode normal playback menu

PLAY

MD-MT20/20C/20W

: Continuous playback @@@@@@: Mode and address display * When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the NORMAL mode is canceled, the power is turned off.

@@@@@@

EEPROM Setting
Focus
: Focus setting menu PLAY

Focus Setting

EEPROM
FG
SKIP UP SKIP DOWN

: EEPROM setting menu

PLAY

TEMP
FF1
SKIP UP SKIP DOWN

SKIP DOWN

: TEMP setting menu

SKIP UP

SKIP DOWN

MD-MT20/20C/20W

Focus
FF2
SKIP UP SKIP DOWN

: Focus setting menu

SKIP UP

SKIP DOWN

Track
FZH
SKIP UP SKIP DOWN

: Tracking setting menu

SKIP UP

SKIP DOWN

Spin
FLn
SKIP UP SKIP DOWN

: Spin setting menu

SKIP UP

SKIP DOWN

Sled
DJG
SKIP UP SKIP DOWN

: Sled setting menu

SKIP UP

SKIP DOWN

Bass
FLV
SKIP UP SKIP DOWN

: BASS setting menu

SKIP UP

SKIP DOWN

ADJSET
WTf
SKIP UP SKIP DOWN

: Adjustment setting menu

SKIP UP

SKIP DOWN

DEQSET
FSS

: Digital EQ setting menu

20

SKIP UP SKIP UP

SKIP DOWN

CTRL

: Control setting menu

* 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 state, the specific setting menu is set.

BASS Setting

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In specific state the setting changed in the range of "00h to FFh" when the [VOL UP/DOWN] button is pressed. (The upper limit varies depending on the items) * When the [MODE] button is pressed in each state, the set digit is changed.

Bass

: BASS setting menu

PLAY

BS1

SKIP UP

SKIP DOWN

BS2

SKIP UP

SKIP DOWN

BS3

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In the specific state the setting changes in the range of "00h to FFh" when the [VOL UP/DOWN] button is pressed. (The upper limit varies depending on the items) * When the [MODE] button is pressed in each state, the set digit is changed.

Spin Setting
Tracking Setting T r a c k
: Tracking setting menu PLAY

S p i n
TG
SKIP UP SKIP DOWN

: Spin setting menu

PLAY

SPG
TF 1
SKIP UP SKIP DOWN

SKIP UP

SKIP DOWN

SP i
TF 2
SKIP UP SKIP DOWN

SKIP UP

SKIP DOWN

SP m
TFS
SKIP UP SKIP DOWN

SKIP UP

SKIP DOWN

SP o
TB o
SKIP UP SKIP DOWN

SKIP UP

SKIP DOWN

SP 1
TB t
SKIP UP SKIP DOWN

SKIP UP

SKIP DOWN

SP 2
TKo
SKIP UP SKIP DOWN

SKIP UP

SKIP DOWN

SP3
TKt
SKIP UP

SKIP UP

SKIP DOWN

SKIP DOWN

21

SP4
TDo
SKIP UP

SKIP UP

SKIP DOWN

SKIP DOWN

SP5
SKIP UP

TDt
SKIP DOWN

SKIP UP
SKIP UP

SKIP DOWN

SPD

TGR
SKIP DOWN

SKIP UP

SKIP DOWN

SPK

SC t
SKIP UP SKIP DOWN

SCm
SKIP UP SKIP DOWN

CLp
SKIP UP SKIP DOWN

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In specific state the setting changed in the range of "00h to FFh" when the [VOL UP/DOWN] button is pressed. (The upper limit varies depending on the items) * When the [MODE] button is pressed in each state, the set digit is changed.

CLr
SKIP UP SKIP DOWN

JPI
SKIP UP SKIP DOWN

MD-MT20/20C/20W

K10
* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In the specific state the setting changes in the range of "00h to FFh" when the [VOL UP/DOWN] button is pressed. (The upper limit varies depending on the items) * When the [MODE] button is pressed in each state, the set digit is changed.

Sled Setting

TEMP Setting Temp
: Temp setting menu PLAY

S l e d

: Slide setting menu

PLAY

SLG

TM§§
SKIP UP SKIP DOWN

MD-MT20/20C/20W

SKIP UP

SKIP DOWN

SL2

T p i n

SKIP UP

SKIP DOWN

: TEMP reference : Reference § § : Temperature code : TEMP A/D input value : Measurement value

SLM

SKIP UP

SKIP DOWN

SLV

SKIP UP

SKIP DOWN

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In the specific state the setting changes in the range of "00h to FFh" when the [VOL UP/DOWN] button is pressed. * When the [MODE] button is pressed in each state, the set digit is changed.

SKk

Adjustment Setting ADJSET
PLAY : Adjustment setting menu

SKIP UP

SKIP DOWN

SKt

SKIP UP

SKIP DOWN

22

SKm

SKIP UP

SKIP DOWN

COK
SKIP UP SKIP DOWN

WTm

SKIP UP

SKIP DOWN

FAT
SKIP UP SKIP DOWN

MV1

SKIP UP

SKIP DOWN

TAT
SKIP UP SKIP DOWN

MV2
SKIP UP

SKIP UP

SKIP DOWN

CAT
SKIP DOWN

SRV

FAB
* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In the specific setting display state the setting change digit changes when the [P-MODE] button is p