Sharp MD-MT20WS, MD-MT20WGL, MD-MT20WBL, MD-MT20CS, MD-MT20S Service Manual

MD-MT20/20C/20W

SERVICE MANUAL

No. S6943MDMT20//

MD-MT20(S)

MD-MT20C(S)

MD-MT20W(BL)

MD-MT20W(GL)

MD-MT20W(S)

Illustration: MD-MT20/20C

• 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	This document has been published to be used
	for after sales service only.
– 1 –	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 ! Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen. VARNING! Osynlig laserstralning när denna del är öppnad och spärren är urkopplad. Betrakta ej strälen.

Precaution to be taken when replacing and servicing the laser pickup.

The following precautions must be observed during servicing to protect your eyes against exposure to the laser.

Warning of possible eye damage when repairing:

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

	Magnet head		Magnet Head	Laser Beam
		Mechanism
		Chassis
	Top Cabinet	Spindle motor	Main PWB Optical Pick-Up
	Optical pick-up
	Figure 2-1		Figure 2-2

– 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

■ General

Power source:

Power consumption: Output power:

Charging time:

DC 2.4V: Rechargeable Nickel-Metal Hydride battery (ADT20BT) x 1

DC 5V: AC adaptor (AC 120V, 60 Hz)

DC 3.0V: Commercially available, “AA” size (LR6), alkaline battery x 2

DC 4.5V: Separately available car adaptor, AD-CA20X (for cars with a 12-24V DC negative ground electrical system)

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)

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

●The continuous recording time is for analog 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 68°F (20°C).

●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			Reference input level		Input impedance
			MIC H			0.25 mV			10 k ohms
			MIC L			2.5 mV			10 k ohms
			LINE			100 mV			20 k ohms
Output level:
					Specified		Maximum		Load
						output	output level		impedance
			Headphones			—	10 mW + 10 mW		16 ohms
			LINE			250 mV	—		10 k ohms
						(-12dB)
Dimensions:			Width:	3-7/16" (87.9 mm)
			Height:	1-3/16" (29.8 mm)
			Depth:	3-1/8"	(79.7 mm)
Weight:			0.52 lbs. (235 g) with rechargeable battery
Input jack:			Line/optical digital, microphone (powered by the main unit)
Output jack:			Headphones (impedance: 19 ohms)/remote control unit
■ 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:			20 – 20,000 Hz (± 3 dB)
Rotation speed:			Approx. 400 – 900 rpm
Error correction:			ACIRC (Advanced Cross Interleave Reed-Solomon Code)
Coding:			ATRAC (Adaptive Transform Acoustic Coding), 24-bit com-
			puted type
Recording method:			Magnetic modulation overwrite method
Sampling frequency:			44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz,
			and then recorded.)
Wow and flutter:			Unmeasurable (less than ±0.001% W. peak)

MD-MT20W

General

Power source:

Power consumption: Output power:

Charging time:

Battery life:

DC 2.4V: Rechargeable Nickel-Metal Hydride battery (ADT20BT) x 1

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

DC 3.0V: Commercially available, “AA” size (LR6), alkaline battery x 2

DC 4.5V: Separately available car adaptor, AD-CA20X (for cars with a 12-24V DC negative earth electrical system)

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	When using two, commercially
battery (fully charged) included	available, high capacity, “AA”
with the unit	size (LR6), alkaline batteries
Continuous recording:	Continuous recording:
Approx. 7.5 hours	Approx. 7.5 hours
Continuous play:	Continuous play:
Approx. 12 hours	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 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			Reference input level		Input impedance
			MIC H			0.25 mV			10 k ohms
			MIC L			2.5 mV			10 k ohms
			LINE			100 mV			20 k ohms
Output level:
					Specified		Maximum		Load
						output	output level		impedance
			Earphones			—	10 mW + 10 mW		32 ohms
			LINE			250 mV	—		10 k ohms
						(-12dB)
Dimensions:			Width:	87.9 mm (3-7/16")
			Height:	29.8 mm (1-3/16")
			Depth:	79.7 mm (3-1/8")
Weight:			235 g (0.52 lbs.) with rechargeable battery
Input socket:			Line/optical digital, microphone (powered by the main unit)
Output socket:			Earphones (impedance: 32 ohms)/remote control unit
	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:			20 – 20,000 Hz (± 3 dB)
Rotation speed:			Approx. 400 – 900 rpm
Error correction:			ACIRC (Advanced Cross Interleave Reed-Solomon Code)
Coding:			ATRAC (Adaptive Transform Acoustic Coding), 24-bit com-
			puted type
Recording method:			Magnetic modulation overwrite method
Sampling frequency:			44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz,
			and then recorded.)
Wow and flutter:			Unmeasurable (less than ±0.001% W. peak)

Specifications for this model are subject to change without prior notice

– 3 –

MD-MT20/20C/20W

	Main unit		NAMES OF PARTS
			Illustration: MD-MT20/20C
				1 2 3 4			5 6
1. Monaural Long-Play Mode Indicator
2. Record Indicator												7
3. Level Meter			11
4. Fast Play Indicator												8
5. Repeat Indicator			12
												9
6. TOC Indicator			13
7. Battery Indicator			14									10
8. Random Indicator
9. Track Number Indicator				15			16
10. Character/Time Information Indicator
11. Synchro Recording Indicator			17	18 19 20					21

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

29.Open Lever

30.Remote Control/Earphones Socket

31.Optical/Line Input Socket

32.Microphone Input Socket

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

22

23

24 25 26 27 28

30

29

31

32

33

34

35

1

4

2 5

6

7

3

8

9

– 4 –

– 5 –

POWER SOURCE

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

2

3

4 5

To the DC IN 5V socket

Insert securely,

all the way in. AC 110-240V, 50/60 Hz

For MD-MT20W

To the DC IN 5V jack
Insert securely,	AC 120V,
all the way in.	60 Hz

For MD-MT20/20C

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.

1 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 being slid all the way out, it may break.

2 Insert the rechargeable battery according to the polarity marked on the bottom of the unit.

3 Close the battery cover.

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

5 Press the CHARGE (VOLUME down) 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.)

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.

RECORDING USING THE OPTICAL DIGITAL CABLE

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.

1 Connect the external equipment.

2 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 recording level.

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 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).

Playback

Digital cable

Recording

CD player, MD player, etc.

Digitally recorded MiniDisc

MD player
Playback	Digital cable	Recording

Analogue recording is possible.

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.

MANUAL OPERATION

MT20/20C/20W-MD

– 6 –

CONVENIENT OPERATION OF THE UNIT

Checking the remaining amount of battery level

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

Battery indicator

< How to read the battery indicator >

When the battery					When the battery
level is high					level is very low

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

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.

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 theAC 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.

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 position (direction indicated by the arrow).

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

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

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

Can only be operated from the remote control unit.

Can only be operated from the main unit.

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

Cancel Hold

Hold Cancel

Hold Hold

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.

TROUBLESHOOTING

Moisture condensation

In the following cases, condensation may form inside the unit.

Shortly after turning on a heater.

When the unit is placed in a room where there is excessive steam or moisture. When the unit is moved from a cool place to a warm place.

When the unit has condensation inside, the disc signals cannot be read, and the unit may not function properly.

If this happens, remove the disc.

The condensation should evaporate in approximately 1 hour. The unit will then function properly.

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

If something seems to be wrong with this product, check the following before calling your authorised SHARP dealer or service centre.

PROBLEM

CAUSE

The unit does not turn on.

No sound is heard from the earphones.

When the operation buttons are pressed, the unit does not respond.

Some sounds are skipped.

The MiniDisc cannot be ejected.

Recording and editing are impossible.

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?

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

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.

4.Plug the AC adaptor back into the AC socket and retry the operation.

If strange sounds, smell or smoke come out of the unit or an object is dropped into the unit, remove the AC adaptor from the AC socket immediately and contact an authorised SHARP service centre.

MT20/20C/20W-MD

– 7 –

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.

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.

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.

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 operations, some sounds may be skipped.

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

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 recording and editing operations were performed, 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 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.

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

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

ERROR MESSAGES

Error messages

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)

Meaning

●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 correctly due to vibration or shock in the unit.

●Editing is impossible.

●The disc is scratched.

Din UNLOCK

(UNLOCK)

DISC FULL

HOLD (HOLD)

LOCKED

LOCK ERROR

NO DISC

PB DISC

POWER ?

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)

●Poor connection of the digital cable.

●The disc is out of recording space.

●The unit is in the hold mode.

●The EJECT lever was moved during recording or editing.

●A disc has not been loaded.

●You tried to record on a playbackonly disc.

●Improper power is being supplied.

●The MD is write protected.

●You tried to record without loading an MD.

●A playback-only MD was loaded and the REC button was pressed when the power was off.

●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 signal.

●A disc which contains data other than music was played.

●There is an error in the signal from the disc.

( ): Error messages seen on the remote control.

Remedy

●Charge the rechargeable battery or replace the alkaline battery (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 recordable disc.

●Connect the digital cable securely.

●Replace it with another recordable disc.

●Return the HOLD switch to its original 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.

●Load a recordable MD.

●Replace it with a recordable MD.

●Reload the disc or replace it.

●Replace it with another recorded disc.

●Wait for a while and try the operation again.

●To have it repaired, go to the distributor 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.

MT20/20C/20W-MD

– 8 –

PORTABLE MINIDISC RECORDER Quick Guide/Guía rápida MD-MT20

1 Check the supplied accessories / Compruebe los accesorios suministrados

● Remote Control Unit	● Headphones x 1	● AC Adaptor x 1	● Rechargeable Nickel-
x 1			Metal Hydride Battery x 1
● Controlador remoto	● Auriculares x 1	● Adaptador de CA x 1	● Batería recargable de
x 1			litio-ion x 1

	● Optical Digital Cable	● Carrying Bag x 1	● Battery Carrying Case
● Analog Cable x 1	x 1	● Caja para el	x 1
● Cable analógico x 1	● Cable óptico digital	transporte x 1	● Caja portabaterías x 1
	x 1

2 Power source / Alimentación

■Rechargeable battery power

■Alimentación de la batería recargable

1

2

3

4

5

∙ AC 120V, 60Hz

∙ 120V CA, 60Hz

■Alkaline battery power

■Alimentación de la pila alcalina

1

2

3

■AC power

■Alimentación de CA

∙ AC 120V, 60Hz

∙ 120V CA, 60Hz

3 Connection / Conexión

■Analog recording

■Grabación analógica

	Playback side	Recording side
		Lado de grabación
	Lado de reproducción
	AUDIO OUT
	R	L
		OPTICAL/
		LINE IN
	(RIGHT)	(LEFT)

(DERECHO)

∙To the line output jacks on a stereo

∙A los enchufes de salida de línea de un equipo estéreo

(IZQUIERDO)

∙Analog cable included with this unit

∙Cable analógico suministrado con este

■Digital recording

■Grabación digital

		Recording side
		Lado de grabación
	Playback side	OPTICAL/
		LINE IN
	Lado de reproducción
	∙	Optical digital cable
	∙	(supplied)
		Cable óptico digital
	DIGITAL OUT	(suministrado)

■Microphone

■Micrófono

Stereo microphone

Micrófono estéreo

Recording side

Lado de grabación

MIC IN

PLUG IN

POWER

MT20/20C/20W-MD

ONLY) MT20-(MD GUIDE OUICK

– 9 –

4 Recording / Grabación

■Recording from CDs or MDs (Synchro recording)

■Grabación de discos compactos o minidiscos (Grabación sincronizada)

1	Connect the external equipment.
	Conecte el equipo externo.
2	Insert a recordable MiniDisc.
	Inserte un minidisco grabable.
2

1	3

3

4

5

6

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.

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

Press the ENTER/SYNC button.

Pulse el botón ENTER/SYNC.

Begin playback on the source equipment.

Inicie la reproducción en el equipo fuente.

■Recording from the microphone (Mic synchro recording)

■Grabación de un micrófono (Grabación sincronizada con micrófono)

1	Connect the stereo microphone to the MIC IN jack.
	Conecte el micrófono estéreo al enchufe MIC IN del
	aparato principal.
2	Insert a recordable MiniDisc.
	Inserte un minidisco grabable.
3	Press the REC button.
	Pulse el botón REC.
4	Press the	or	button to adjust the
	recording level.

Pulse el botón o para ajustar el nivel de grabación.

Press the ENTER/SYNC button to select the syn- 5 chro 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.)

6	When a sound, such as a person speaking, is
	picked up by the microphone, recording will be-

gin 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 ■/:OFF button.

Pulse el botón ■/:OFF.

To turn off the power:

Para desconectar la alimentación:

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

Pulse el botón ■/:OFF estando en el modo de parada.

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.

	2
1	3

5 Playing a MiniDisc / Reproducción de un minidisco

2	4
1	3
1	Insert the headphones plug firmly into the
	headphones jack on the remote control unit.

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

2	Plug the remote control unit into the jack on
	the main unit. Push the plug all the way in.
	Enchufe el controlador remoto en el enchufe
	del aparato principal. Empuje completamente
	hacia adentro la clavija.

3	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)

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.

●When the recordable MiniDisc write protection tab is closed

●When the auto-play function has been canceled

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

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 stop playback:

Para detener la reproducción:

Press the ■/:OFF button.

Pulse el botón ■ /:OFF.

To turn off the power:

Para desconectar la alimentación:

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

Pulse el botón ■ /:OFF estando en el modo de parada.

6 Sound control / Control del sonido

Adjust the volume.

Press the + button to increase the volume and the – button to decrease the volume.

Ajuste el volumen.

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

∙Volume (0 - 30)

∙Volumen (0 - 30)

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:

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.
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.

MT20/20C/20W-MD

MD-MT20/20C/20W

			DISASSEMBLY
	Cares before disassembling				(B1)x2		LCD
							Key Switch
	When assembling the machine after disassembling or				ø1.4x2mm
	repair, observe the following requirements so as to ensure				(A1)x2		Top Cabinet
	safety and performance.
					ø1.4x2mm
	1. Remove the batteries from the machine, and take out the							(A1)x1
	mini-disc.							ø1.4x2mm
	2. When assembling after repair, be sure to restore the				Open
	initial location of wires.
	Since the screws are small, incorrect fixing may result in				Open Lever
	malfunction.
								(B1)x2
	3. When repairing, pay utmost attention to static electricity
	of IC.							ø1.4x2mm
					(B2)x1
					ø1.4x2mm	(A1)x2	Bottom	(A1)x2
	STEP	REMOVAL	PROCEDURE	FIGURE				ø1.4x2mm
						ø1.4x2mm	Cabinet
	1	Bottom Cabinet	1. Screw ..................... (A1) x7	10-1
						Figu re 10-1
	2	Top Cabinet	1. Open the Top cabinet.	10-1
			2. Screw ..................... (B1) x4			Put the fold on the connector, and
			3. Screw ..................... (B2) x1
	3	Key Switch/LCD	1. Flexible PWB ......... (C1) x2	10-2	(E2)x2	apply with the felt. Sagging may
						result in contact with the sheet metal.
	4	Mechanism Unit	1. Flexible PWB ......... (D1) x2	10-2	ø1.7x2.5mm	(D1)x1		Felt
			2. Raise the rear part, and .....	10-3
			remove in the arrow direction.		Main
						pull
	5	Main PWB	1. Flat cable ................ (E1) x1	10-2	PWB
			2. Screw ..................... (E2) x2			pull		(D1)x1*
	6	Audio PWB	1. Screw ...................... (F1) x3	10-4			pull
								Flexible PWB
							pull
					pull			for optical pickup
					pull pull			Audio
						pull
								PWB
							Mechanism
				(C2)x2		(E1)x1		Unit
				LCD

Key Switch

(F1)x3

ø1.7x2.5mm

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

Figure 10-3

– 10 –

MD-MT20/20C/20W

REMOVING AND REINSTALLING THE MAIN PARTS

Remove the mechanism according to the disassembling methods 1 to 4. (See Page 10.)

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.)

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.)

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.)

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	(E1)x1
	Optical	ø1.7x3mm
		Thrust Plate Spring
	Pickup Unit

MD Mechanism

Figure 11-5

– 11 –

(A2)x3 ø1.4x2.8mm

(A1)x1

Spindle Motor Mechanism Flexible PWB Solder joint

MD Mechanism

	Figure 11-1
Remove the	(B3)x1
	ø1.4x5.5mm
solder joint	(B2)x1
(B1)x2	ø1.4x1.5mm
Head Up/Down
Motor

	MD Mechanism
Figure 11-2
(C1)x1	(C3)x2
Stop Washer	ø1.4x1.2mm
(C2)x1	Sled Motor
Drive Gear
	(C4)x2
	Mechanism Flexible
	PWB Solder Joint

MD Mechanism

Figure 11-3

	(D1)x2	(D2)x2
		Spring Washer
	ø1.4x2.2mm

Magnetic Head

	(D3)x2
(D1)x1	Solder joint
ø1.4x1.5mm	(D1)x1
	ø1.2x1.6mm

MD Mechanism

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		Test disc	Parts No.
1	High reflection disc	MMD-110	(TEAC Test MD)	88GMMD-110
2	Low reflection disc	MMD-212	(TEAC Test MD) 74-minute disc	88GMMD-212
3	Low reflection disc	MMD-213A (TEAC Test MD) 80-minute disc		88GMMD-213A
4	Low reflection disc	Recording minidisc		UDSKM0001AFZZ

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

Entering the TEST mode

1.Setting at port (power nonconnected state)

(1)Set the port as follows. TEST1 : "Low" (TP416) TEST0 : "High"

(2)Turn the Power ON.

(3)Test Mode 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 ]

Microcomputer version						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).

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	• Perform preliminary automatic adjustment.
	• If the combination of mechanism and pickup
	PWB has been changed, be sure to start from
	AUTO1.
2. AUTO 2 Mode	• Perform ATT (attenuator) automatic adjustment.
	• Perform continuous playback (error rate display,
	jump test)
3. TEST-PLAY Mode	• Continuous playback from the specified address
	is performed.
	• 1 line, 10 lines or 384 lines manual jump is
	performed.
	• C1 error rate display (pit section), ADIP error
	rate display (groove section)
	• The temperature correction is performed only when
	servo start is performed, but the posture correction
	is not performed during continuous playback.
4. TEST-REC Mode	• Continuous record from the specified address
	is performed.
	• Change of record laser output(servo gain is also
	changed according to laser output).
	• The temperature correction is performed only
	when servo start is performed, but the posture
	correction is not performed during continuous
	recording.
5. MANUAL 1 Mode	• Temperature is displayed. (Updating in real time)
	• Seeing the displayed adjustment value, perform
	preliminary manual adjustment.
	(Error rate indication, jump test)
6. MANUAL 2 Mode	• Temperature is displayed. (Updating in real time)
	• Seeing the displayed adjustment value perform
	manfully the preliminary adjustment.
	(Error rate indication, jump test)
	• Continuous playback is performed
	(error rate display, jump test).

7. RESULT 1 Mode	• The value adjusted in AUTO1 or MANUAL1 is
	indicated.
	• (Execution in servo "OFF" state").
8. RESULT 2 Mode	• The value adjusted in AUTO 2 or MANUAL 2 is
	indicated.
	• Adjustment value is changed manually.
	(error rate display, jump test).
9. DIGITAL INPUT Mode	• Digital input information is displayed.
10. ERROR INFORMATION	• Error information is displayed.
Mode	• Error information is initialized
11. NORMAL Mode	• The mode is changed from the TEST mode to
	the normal mode without adjustment.
	• In the normal mode the internal operation mode,
	memory capacity, etc. areindicated.
	• In the normal mode both temperature correction
	and posture correction are perfomed.
12. EEPROM Mode	• Factors of digital servo are changed manually.
	(Each servo is turned on individually.)
	• Cut-off frequency of BASS1, BASS2 and BASS3
	is selected manually.
	• Temperature detection terminal voltage is
	measured, and the reference value is set.
	• Defaults are selected and set.
	• Setting of EEPROM protect area is updated.
	(In case of protect releasing)
13. INNER Mode	• Determine the position where the INNER switch
	is turned on. (only high reflection disc).
	• The temperature correction is performed only
	when servo start is performed, but the posture
	correction is not performed.

– 12 –

MD-MT20/20C/20W

Operation in each TEST mode

1. AUTO1 Mode

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

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

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

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

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

2. AUTO2 Mode

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

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

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

3. TEST-PLAY Mode

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

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

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

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.

• 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 —

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

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

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

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

1 — 10 — 384 — 1
* After the number of jump lines is indicated for one second, the address indication is restored.	[	T R _ ]

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

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

* When the SKIP UP/DOWN button is held down, jump is repeated every approx. 100 ms.

•Whenever the DISP button is pressed in the continuous playback mode, the indication changes as follows.

* Pre-mastered disc
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

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

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

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

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

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

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

0032 — 0032 — 0032 — 0320 —

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

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

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

–13 –

MD-MT20/20C/20W

5. NORMAL Mode

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

•Indication during operation

Indication of memory capacity on main unit LCD [

] + Level meter

: Internal mode

: Address (Cluster section)

: Address (Sector section)

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

•Recording is also possible.

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

6. Error data display Mode

•Reversing when SKIP DOWN button is pressed

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

TEST mode stop state.

•Error data 0 is the latest error.

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

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

• : Error Code

Explanation of error history code

12h : RF side FG, TG, and TCRS adjustment termination failure

13h : Adjustment servo retraction excessive retrial

16h : C. IN detection time-over

17h : A, B, E, F, and TCRSO offset measurement value out of tolerable range

21h : Focus retraction completion allowable time-over

23h : Track search completion allowable time-over

24h : Disc linear speed measurement failure

32h : P-TOC read failure

42h : U-TOC read failure

44h : U-TOC write data write disabled/read check error 52h : SD write data write disabled

71h : Pickup position initialization time-over

72h : EEPROM data read check sum error

73h : Record head drive disabled (by EJECT lever)

82h : Power overvoltage detection

91h : Ambient temperature is higher that the allowable temperature.

7. INNER Mode

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

• : Address

– 14 –

MD-MT20/20C/20W

EEPROM (IC402) writing procedure

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

(1)Replace EEPROM.

(2)Deprive EEPROM of protection (connect the pins 8 and 6 of IC402).

(3)Refer to the latest EEPROM data list.

(4)Press the Display button, Ente button and Play button to start the test mode.

(5)Version display

[ V e r . 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.

•Set TEST 1, 0 = '01', and turn on power (or set PLAY ON in standby state).

(2) Start the EEPROM mode 'Temp' menu.

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

•'TM$$%%' is displayed. ($$= Temperature code, %% = Temperature reference)

(3)Once press SKIP-UP, and determine the displayed microcomputer TEMP input AD value.

• 'TPin##' is displayed. (## = TEMP input AD value)

(4)At the ambient temperature, determine the temperature corrected value from the temperature measurement value correction table.

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

• Temperature reference = Microcomputer TEMP input AD value + Temperature corrected value

(6) Set the temperature reference value by button operation , and check whether the temperature code indication corresponds to "Temperature

Code Identification Table".

[2] Temperature measurement value correction table

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

Ambient	Temperature	Center
temperature	correction	temperature
- 9oC ~ +10oC	08h	+ 0.5oC
+ 3oC ~ +21oC	07h	+ 12.5oC
+15oC ~ +33oC	06h	+ 23.6oC
+26oC ~ +43oC	05h	+ 35.0oC

– 15 –

MD-MT20/20C/20W

EEPROM DATA LIST (EEPROM version f)

TEMP setting

Item display	Set values
T M _ _	Calculate values

Fucus setting

Item display	Set values
F G _ _	B 0 H
F F 1 _	7 0 H
F F 2 _	E 8 H
F Z H _	E D H
F L n _	0 A H
D J G _	1 4 H
F L V _	3 3 H
W T f _	2 0 H
F S S _	E 9 H

Tracking setting

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

Spindle setting

	Item display	Set values
S P G _		1 4 H
S P i	_	E 0 H
S P m _		A 0 H
S P o	_	6 8 H
S P 1	_	1 0 H
S P 2	_	6 0 H
S P 3	_	F 2 H
S P 4	_	F 2 H
S P 5	_	1 0 H
S P D	_	7 F H
S P K	_	E B H

BASS setting

		Item display	Set values
B S 1		_	3 F H
B S	2	_	1 F H
B S	3	_	E 2 H

Sled setting

Item display	Set values
S L G _	D F H
S L 2 _	2 0 H
S L M _	7 F H
S L V _	D 7 H
S K k _	7 2 H
S K t _	7 0 H
S K m _	7 8 H
W T m _	2 4 H
M V 1 _	4 F H
M V 2 _	A A H
S R V _	0 A H

ADJ. SET setting

Item display	Set values
C O K _	A 0 H
F A T _	C 0 H
T A T _	3 E H
C A T _	2 0 H
F A B _	E 0 H

EQ. SET setting

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

Control setting

Item display	Set values
C T 0 _	0 5 H
C T 1 _	1 1 H
C T 2 _	7 F H
C T 3 _	3 0 H
R C 0 _	C 0 H
R C 1 _	F E H
S Y C _	A 6 H
P W L _	0 3 H
D R 1 _	9 2 H
D R 2 _	C 8 H
I N 1 _	D 3 H
I N 2 _	6 4 H
I N 3 _	D 2 H
I N H _	6 4 H
D R H _	C 8 H
P L E _	1 B H
R C E _	4 2 H
E L T _	7 6 H
S L T _	4 3 H
S P M _	0 0 H
M S L _	0 0 H
U S 0 _	0 0 H
U S 1 _	0 0 H
U S 2 _	0 0 H

– 16 –