Sharp MD-MT877S Service Manual

MD-MT877/MD-MT877C

SERVICE MANUAL

No. S3118MDMT877/

PORTABLE MINIDISC RECORDER

MD-MT877(S)

MODEL MD-MT877C(S)

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

CONTENTS

Page

SPECIFICATIONS ................................................................................................................................................................. 2

NAMES OF PARTS ............................................................................................................................................................... 3

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

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

REMOVING AND REINSTALLING THE MAIN PARTS....................................................................................................... 11

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

NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 28

TYPES OF TRANSISTOR AND DIODE .............................................................................................................................. 28

BLOCK DIAGRAM ............................................................................................................................................................... 29

SCHEMATIC DIAGRAM ...................................................................................................................................................... 30

WIRING SIDE OF P.W.BOARD........................................................................................................................................... 32

VOLTAGE ............................................................................................................................................................................ 36

WAVEFORMS OF MD CIRCUIT ......................................................................................................................................... 37

TROUBLESHOOTING ......................................................................................................................................................... 38

FUNCTION TABLE OF IC.................................................................................................................................................... 41

PARTS GUIDE/EXPLODED VIEW PACKING OF THE SET (MD-MT877(S) FOR U.S.A. ONLY)

SHARP CORPORATION

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

MD-MT877/MD-MT877C

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

SPECIFICATIONS

Power source DC 1.2V: Rechargeable Nickel-Metal Hydride battery (AD-N55BT) x 1

DC 5V: AC adaptor (AC 120V, 60 Hz) DC 1.5V: Commercially available, “AA” size (LR6), alkaline battery x 1 DC 1.5V: Separately available car adaptor, AD-CA55X (for cars with a 12-24V DC negative ground electrical sys-

tem) (Used with separately available plug adaptor (AD-M66PA))

Power consumption 7 W (AC adaptor) Output power RMS; 10 mW (5 mW + 5 mW) (0.2% T.H.D.) Charging time Approx. 3.5 hours Input sensitivity MIC H: reference input level 0.25 mV input impedance 10 k ohms

MIC L: reference input level 2.5 mV input impedance 10 k ohms LINE: reference input level 100 mV input impedance 20 k ohms

Output level Earphones:maximum output level 5 mW + 5 mW load impedance 32 ohms

LINE: specified output 250 mV (-12 dB) load impedance 10 k ohms

Dimensions Width: 2-27/32” (71.9 mm) Height: 11/16” (16.8 mm) Depth: 3-1/8” (78.7 mm) Weight 0.29 lbs. (131 g) with rechargeable battery

Input jack Line/optical digital, microphone (powered by the main unit) Output jack Earphones (impedance: 32 ohms)/remote control unit Type Portable MiniDisc recorder Signal readout Non-contact, 3-beam semiconductor laser pickup Audio channels Stereo 2 channels/monaural (long-play mode) 1 channel Frequency response

20 – 20,000 Hz (± 3 dB)

Rotation speed Approx. 400 – 1,350 rpm Error correction ACIRC (Advanced Cross Interleave Reed-Solomon Code) Coding ATRAC/ATRAC3 (Adaptive TRansform Acoustic Coding), 24-bit computed 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)

Battery life

Stereo 2 times long 4 times long

When using the rechargeable battery (fully charged) included with the unit

When using one, commercially available, high capacity, “AA” size (LR6), alkaline battery (The rechargeable battery is in the unit, discharged.)

When using one, commercially available, high capacity, “AA” size (LR6), alkaline battery with the rechargeable battery (fully charged)

● The above values are the standard values when the unit is operated horizontally and charged at an ambient temperature of 77°F (25°C). (The operable duration with the rechargeable battery will be shorter when the unit is carried around.)

● The volume level is set at “VOL 15”.

● The LED is set at “LIGHT OFF”.

Continuous Continuous Continuous Continuous Continuous Continuous recording: play: recording: play: recording: play: Approx. Approx. Approx. Approx. Approx. Approx.

6.5 hours 12 hours 9 hours 13.5 hours 11.5 hours 15 hours Continuous Continuous Continuous Continuous Continuous Continuous

recording: play: recording: play: recording: play: Approx. Approx. Approx. Approx. Approx. Approx. 6 hours 16 hours 10 hours 19.5 hours 13 hours 22 hours

Continuous Continuous Continuous Continuous Continuous Continuous recording: play: recording: play: recording: play: Approx. Approx. Approx. Approx. Approx. Approx. 15 hours 29 hours 22 hours 33 hours 30 hours 40 hours

● Operable duration with a commercially available battery varies depending on its maker, type, and conditions of use.

● “Fully charged” means that the charging is complete after approximately

3.5 hours since the remaining amount of the battery is reduced to “ (1 bar).

”

Specifications for this model are subject to change without prior notice

– 2 –

NAMES OF P ARTS

MD-MT877/MD-MT877C

Main unit

1. Record/Track Mark Button

2. Mode Button

3. Volume/Cursor/Fast Forward/Fast Reverse/ Recording Level/Name Select Button

4. Stop/Power Off/Hold Button

5. Open Lever

6. Display/Character Select Button

7. Edit/Auto Mark/Time Mark Button

8. Play/Pause Button

9. Enter/Fast Play/Synchro Button

10. Bass/Delete Button

11. Rechargeable Battery Cover

12. Handstrap Holder

13. Optical/Line Input Jack

14. Microphone Input Jack

15.

Remote Control/Earphones/Line Output Jack

Main unit display panel

1. Level Meter

02. Record Indicator

03. Synchro Recording Indicator

04. Operation Indicator

05. Long-play/Recording Mode Indicator

6. Character/Time Information Indicator

7. Repeat Indicator

8. Battery Indicator

9. Random Indicator

10. Track Number Indicator

11. TOC Indicator

12. Disc Name Indicator

3-color LED

Various modes are indicated with three colors of lights.

Charging Light Refresh Extinguishing starting with orange light

Playback Flashing the color of the activated play- Recording Flashing the color of the activated re-

Fast Forward Fast Reverse Flashing starting with orange light. Volume (+) Lighting starting with yellow-green light. Volume (–) Extinguishing instantly starting with or-

TOC Reading: flashing at random.

ing starting with yellow-green light. after all the lights are lit. back mode. cording mode.

Flashing starting with yellow-green light.

ange light after all the lights are lit.

1 2 3 4 5 6

Yellow-

green

Blue

7 8 9 10 11 12

Orange

– 3 –

MD-MT877/MD-MT877C

Remote control unit

1. Earphones Jack

2. Fast Forward/Fast Reverse Button

3. Display Button

4. Play Mode Button

5. Sound/Track Mark Button

6. Stop/Power Off Button

7. Play/Pause Button

8. Volume Button

9. Hold Switch

Remote control display panel

1. Record Indicator

02. Track Number Indicator

03. Operation Indicator

04. Character/Time Information Indicator

05. Battery Indicator

06. Random Indicator

07. Synchro Recording Indicator

08. Total Track Number Indicator

09. Long-play/Recording Mode Indicator

10. Repeat Indicator

2345

123

Battery charger

1. Remote Control Holder (You can hang the remote control on it.)

2. Lock Detector

3. Hook For Fixing The Main Unit

4. Charge/Operation Switch

5. Stand

6. AC Adaptor Connecting Jack

CHARGE

OPERATION

4 5 6

– 4 –

MD-MT877/MD-MT877C

OPERATION MANUAL

Using with the Rechargeable Battery

Charging

Do not force the battery cover open too far.

AC 120V 60Hz

Charge mode

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.

Insert the rechargeable battery.

Move the Charge/Operation switch to charge mode.

Place the portable MD into the battery charger and connect the AC adaptor.

●

After the rechargeable battery is charged or used, it will get slightly warm. This is normal.

●

When the portable MD is turned on or operating, the battery will not be charged.

To the DC IN 5V jack

Checking Displays

Checking the remaining amount of battery level

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

How to read the battery indicator

When the battery level is high

● When the battery is completely discharged, the battery

indicator will flash. Recharge the battery or replace the alkaline battery with a new one.

● When the battery has run completely out, “BATT EMPTY

(LoBA TT)” will appear. Then, the power will be disconnected automatically.

Notes:

● If you use the battery which you stopped charging half-

way, “ tery is completely charged.

● The battery indicator will not correctly display the remain-

ing capacity for approximately 20 seconds after the power has been turned on.

● When the AC adaptor or a separately available car adap-

tor 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.

” may appear. It does not mean that the bat-

When the battery low is very low

– 5 –

MD-MT877/MD-MT877C

Error Messages

ERROR MESSAGES

BATT EMPTY

(LoBATT)

BLANK MD

(BLANK)

Can’t COPY

(Can’tC)

Can’t EDIT

(Can’tE)

Can’t READ *

(Can’tS) (Can’tT) (Can’tU)

Can’t REC

(Can’tR)

Can’t STAMP Can’t WRITE

(Can’tW)

CHARGEmode

DEFECT

(DEFECT)

DISC FULL Er-MD **

(ErMD*)

HOLD

(HOLD)

LOCKED

(Can’tLOCK)

MEANING

● The battery is run down.

● Nothing is recorded.

● You tried to record from a copy prohibited

MiniDisc.

● A track cannot be edited.

● The disc data cannot be read because the disc

is damaged.

● Recording cannot be performed correctly due to vibration or shock.

● Stamp function does not work.

● Cannot save the TOC information correctly to a

MiniDisc. (A large portion of the disc has been damaged.)

● The Charge/Operation switch is not set to the operation mode when using this unit with the AC adaptor.

● The disc is scratched.

● The disc is out of recording space.

● The microprocessor has reported a system fault

and the unit is out of order.

● The unit is in the hold mode.

● You removed a MiniDisc while recording or

editing.

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. (MD-MT877(S)) Record using the analogue cable. (MD-MT877C(S))

●

● Change the stop position of the track and then edit it.

● Reload the disc.

● Replace it with another recorded disc.

● Re-record or replace it with another recordable disc.

● Check the number of tracks.

● Replace the disc with another recordable disc.

● Set the Charge/Operation switch to the operation mode.

● If the sound you hear is not right, record again.

● Replace the disc with another recordable disc.

● Replace it with another recordable disc.

● To have it repaired, go to the distributor where you pur-

chased the unit.

● Return the HOLD switch to its original position.

● Turn off the power and remove the MiniDisc.

Error Messages : continued

ERROR MESSAGES

NO DISC NO SIGNAL

(noSIG.)

PLAY MD

(PLAYmd)

POWER ? PROTECTED

SORRY

(Sorry)

TEMP OVER

(TEMP!)

TOC FORM **

(Tform**)

TOC FULL Tr. Protect

? DISC

(? DISC)

( ) : Error messages seen on the remote control. Number or symbol appears in * position.

● A disc has not been loaded.

● Poor connection of the digital cable.

● No output signal comes out from the connected

unit to playback.

● The input signal has improper sampling frequency.

● You recorded on a playback-only disc.

● The battery charger is defective.

The write protection tab of a MiniDisc is set to

●

the protected position.

●

You tried to record on a playback-only disc.

● Since a track number is currently being located or updated, the unit cannot accept your command.

● The temperature is too high.

● There is an error in the recording signal.

● There is no space left for recording character

information (track names, disc names, etc.).

● The track has been protected from being erased.

● A disc which contains data other than music was

played.

● There is an error in the signal recorded on the disc.

● Stamping is not possible.

MEANING

● Load a disc.

● Connect the digital cable securely.

●

If the portable CD player has a function to prevent sound skips, deactivate it.

● Playback with the connected unit.

●

Replace it with a recordable disc.

● To have it repaired, go to the distributor where you purchased the unit. Move the write protection tab back to its original position.

●

● Replace it with a recordable MiniDisc.

● Wait for a while and try the operation again.

● Turn off the power, and wait for a while.

● Erase all of the tracks, and then record again.

● Replace it with another recordable disc.

● Edit the track with the device on which it was recorded.

● A disc which contains non-music data cannot be played.

● Replace it with another recorded disc.

● Retry.

REMEDY

– 6 –

MD-MT877/MD-MT877C

The unit may have the following symptoms while recording or editing. The unit is not out of order.

MiniDisc System Limitations

SYMPTOM

“DISC FULL” or “TOC FULL” appears even though the MiniDisc still has recording time left.

The remaining recording time does not increase even though you erased tracks.

The total of the recorded time and the remaining time does not match the maximum recordable time.

Combine function does not work.

Sound skips in fast reverse/forward.

A track number is created in the middle of a track.

LIMITATIONS

More than 255 tracks (maximum) cannot be recorded regardless of the recording time. If the MiniDisc is recorded or edited repeatedly or if it has scratches (recording skips scratched parts), you may not be able to record the maximum tracks above.

The unit does not count non-recorded portions that last 12 or fewer seconds to display the remaining recording time. The time may not increase even if you erase short tracks.

One cluster (approximately 2 seconds) is the minimum unit for recording. For example, a 3-second track uses 2 clusters (approximately 4 seconds). Therefore, the actual recordable time may be shorter than the displayed time.

A MiniDisc on which recording and editing are repeated may not allow the combine function.

One track is divided and recorded in separate places on a repeatedly recorded or edited MiniDisc. Sound may skip.

A track number may be created if there are scratches or dust on the MiniDisc.

Troubleshooting

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 authorized SHARP dealer or service center.

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.

●

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 earphones plug inserted firmly?

●

Is the battery exhausted?

●

Is the unit being subjected to excessive vibration?

PROBLEM CAUSE

The MiniDisc cannot be ejected.

Recording and editing are impossible.

The battery cannot be charged.

Nothing appears on the remote control display.

●

Has the track number or character information been updated 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 while recording or editing?

●

Is the unit in the hold mode?

●

Is an optical signal being output from the stereo system? Read the operation manual for the stereo system.

●

Is the select switch for charging/ operation set on the charging side?

●

Is the jack clean?

●

Is the remote control display set to “LIGHT OFF”?

– 7 –

MD-MT877/MD-MT877C

Preparation for use

Preparación para su utilización

The unit does not work if the • / –HOLD button is set to HOLD.

Este aparato no funciona si el botón • / –HOLD está puesto en HOLD.

Hold

Retención

Released

Liberación

CAUTION:

It is not recommendable to put the MiniDisc into a rear pocket, as this may damage the product when sitting.

PRECAUCIÓN:

No se recomienda ponerse un minidisco en el bolsillo trasero del pantalón, porque podría dañarlo al sentarse.

For operations

Para operaciones

Move it to operation mode when playing back or recording.

Muévalo a la posición del modo de operación para la reproducción o grabación.

Operation mode

Modo de operación

Press the • / –HOLD button for 2 seconds or more.

Pulse el botón • /–

HOLD

durante 2 o más segundos.

Insert a MiniDisc

Inserte un minidisco

Connect the AC adaptor

Conecte el adaptador de CA

222

Slide the OPEN lever to release the compartment door.

Deslice la palanca OPEN para abrir la puerta del compartimiento.

Lift it up.

Levantelo.

Recordable

Para poder grabar

Recording prevented

Para no poder grabar

Insert according to the direction of the arrow.

Insértelo de acuerdo con la dirección de la flecha.

Insert a MiniDisc as shown.

Inserte un minidisco como se muestra.

Close the compartment.

Cierre el compartimiento.

When you record on a MiniDisc, check that the erase prevention tab is set to the “recordable” position.

Cuando desee grabar en un minidisco, compruebe que la lengüeta de protección contra borrado esté colocada en la posición para "poder grabar".

AC 120V, 60 Hz

120V CA, 60Hz

RELEASE

LOCK

To the DC IN 5V jack

A la toma DC IN 5V

Move the Charge/Operation switch to Charge mode (RELEASE).

Mueva el selector de carga/ operación al modo de carga

(RELEASE).

Insert the portable MD into the battery charger.

Inserte el MD portátil en el cargador de baterías.

Before using the unit with a rechargeable battery, the battery has to be charged. Refer to “Using with the rechargeable battery”.

Antes de emplear el aparato con una batería recargable, se deberá cargar la batería. Consulte el apartado de "Empleo con la batería recargable".

Insert securely, all the way in.

Insértelo con seguridad a fondo.

Move the Charge/Operation switch to Operation mode (LOCK).

Mueva el selector de carga/ operación al modo de operación

(LOCK)

Plug the AC adaptor.

Enchufe el adaptador de CA.

To an AC outlet

A un tomacorriente de CA

Connection

Conexión

LINE OUT

LEFTRIGHT

To a stereo system with jacks (See left. Analog connection)

Note:

If the audio system has only one pair of jack then they are usually input only and recording via this connection is not possible.

A un sistema estéreo provisto de tomas de salida de línea "LINE OUT" o de salida de audio "AUDIO OUT" (Vea a la izquierda, Conexión analógica)

Nota:

Si el sistema de audio sólo tiene un par de tomas, normalmente son sólo de entrada y no puede realizarse la grabación mediante esta conexión.

OPTICAL/

LINE IN

Red: To Right Rojo: A la

derecha

White: To Left Blanco: A la

izquierda

“LINE OUT” or “AUDIO OUT”

– 8 –

Recording

Grabación

Check that the unit is connected to the stereo system.

Compruebe que el aparato esté conectado al sistema estéreo.

MD-MT877/MD-MT877C

Press the PAUSE button on the stereo system to enter the playback pause mode at the point you wish to start recording.

Pulse el botón PAUSE del sistema estéreo para entrar en el modo de pausa de reproducción en el punto en el que desee iniciar la grabación.

Press the MODE button repeatedly to select the recording mode.

Pulse repetidamente el botón MODE para seleccionar el modo de grabación.

Press the button to start recording.

Pulse el botón para iniciar la grabación.

Begin playback on the stereo system, the output will be recorded.

Inicie la reproducción del sistema estéreo, y se grabará la salida.

Press the REC button.

Pulse el botón REC.

Begin playback on the stereo system connected to this unit.

Inicie la reproducción en el sistema estéreo conectado a este aparato.

Press the or button

Adjust the recording level so that the maximum sound volume from the source makes the reading swing somewhere between –4 dB and 0 dB.

Pulse el botón o para ajustar el nivel de grabación.

Ajuste el nivel de grabación para que el volumen de sonido máximo de la fuente produzca una indicación de entre –4 dB y 0 dB.

Level meter indicator

Indicador del medidor de nivel

to adjust the recording level.

0dB 4dB

Playing

Reproducción

To stop recording

Press the • / :OFF button.

When recording stops, “TOC” appears (Table Of Contents). While “T OC” appears, the MiniDisc recorded contents have not yet been updated.

Para detener la grabación

Pulse el botón • /:OFF.

Cuando se detenga la grabación, aparecerá “TOC” (índice). Mientras aparece “TOC”, aún no se habrá actualizado el contenido grabado en el MD.

TOC display

Visualización TOC

To update the recorded contents of the MiniDisc

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

The power turns off after recorded contents have been updated on the MiniDisc.

Para actualizar el contenido grabado del MD

Pulse el botón • /:OFF en el modo de parada.

La alimentación se desconectará después de haber actualizado el contenido grabado en el MD.

Insert the earphones plug firmly into the earphones jack on the remote control unit.

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

Plug the remote control into the jack on the unit.

Enchufe el controlador remoto a la toma del aparato.

Insert a MiniDisc.

Inserte un MD

Press the button.

Pulse el botón .

To stop playback

Press the • / :OFF button (Remote control: press the button).

If the unit is not operated for at least 2 minutes while in the stop mode, the power will shut off automatically.

Para detener la reproducción

Pulse el botón • /:OFF. (Controlador remoto: pulse el botón .)

Si el aparato no se utiliza durante un mínimo de 2 minutos en el modo de parada, la alimentación se desconectará automáticamente.

– 9 –

MD-MT877/MD-MT877C

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 position the wires in the same location. Use the specified screws to fix the cabinet and the mechanism unit. The use of the screws with length other than specified may cause contact with the mechanism unit resulting in malfunction.

3. When repairing, pay close attention so not to damage the IC from static electricity.

STEP

REMOVAL

PROCEDURE

1 Bottom Cabinet 1. Screw .....................(A1) x5 10-1

2 Top Cabinet 1. Open the Top cabinet.

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

3. Flexible PWB..........(B2) x1 10-2

3 Main PWB 1. Open the rechargeable

battery compartment of the direction indicated by arrows.

2. Screw .................... (C1) x1

3. Flexible PWB......... (C2) x2

4 MD Mechanism 1. Pull the main frame to the A 10-3

direction and remove the MD

mechanism upward.

2. Screw .................... (D1) x1

5 LCD PWB 1.

Screw

......................(E1) x6 10-4

Hook .......................

(E2) x4

FIGURE

10-1

10-2

(A1) x 1 ø 1.4 x 2 mm

Bottom Cabinet

Battery Cover

(B1) x 2 ø 1.4 x 2 mm

OPEN

EJECT Knob

(A1) x 1 ø 1.4 x 2 mm

(C2) x 1(1*)

pull

Top Cabinet

Figure 10-1

Main PWB

pull

OPEN

(A1) x 2 ø 1.4 x 2 mm

(B1) x 2 ø 1.4 x 2 mm

OPENOPEN

(A1) x 1 ø 1.4 x 2 mm

(B2) x 1

(C2) x 1

(C1) x 1 ø 1.4 x 2.5 mm

Top Cabinet

(E1) x 6 ø 1.4 x 2 mm

Figure 10-4

(E2) x 4

Caution:

Main Frame

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

MD Mechanism

LCD PWB

OPEN

Main Frame

(D1) x 1 ø 1.4 x 1.5 mm

Figure 10-3

– 10 –

REMOVING AND REINSTALLING THE MAIN PARTS

MD Mechanism

(B2) x 1 ø 1.4 x 3.8 mm

Solder Joints (B1) x 2

Lift Motor

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

MD-MT877/MD-MT877C

How to remove the spindle motor (See Fig. 11-1.)

1. Remove the solder joints (A1) x 4 of flexible PWB.

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

How to remove the lift motor (See Fig. 11-2.)

1. Remove the solder joints (B1) x 2 of lift motor lead wire.

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

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

remove the sled motor.

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) x 2 pcs. of the magnetic head and

the optical pickup, and remove the solder joints (D2) x 2 pcs. of the head flexible plate.

Note:

Mount carefully so as not to damage the magnetic head.

(A2) x 3 ø 1.4 x 3 mm

Spindle Motor

Solder joints (A1) x 4

MD Mechanism

Figure 11-1

How to reinstall the optical pickup (See Fig. 11-4.)

1. Remove the screw (E1) x 1 pc., and remove the grip spring.

2. Remove the screw (E2) x 1 pc. to remove the thrust

spring, and remove the drive screw and the optical pickup from MD mechanism. Then, remove the drive screw from the optical pickup.

(E1) x 1 ø 1.4 x 1.8 mm

Drive

Grip Spring

Screw

Optical Pickup

Magnetic head

(D1) x 2 ø1.4 x 1.8 mm

(D2)x2 Solder Joints

Figure 11-4

(E2) x 1

ø 1.7 x 3.5 mm

Thrust Spring

MD Mechanism

Figure 11-2

(C3) x 2

ø 1.4 x 1.2 mm Sled Motor

(C1) x 1

(C2) x 1

(C4) x 3 Solder Joints

MD Mechanism

Figure 11-3

– 11 –

MD-MT877/MD-MT877C

Test disc

ADJUSTMENT

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

Type

1 High reflection disc

2 Low reflection disc

3 Low reflection disc

Test disc Parts No.

MMD-110 (TEAC Test MD)

MMD-213A (TEAC Test MD)

Recording minidisc disc

88GMMD-110

88GMMD-213A

UDSKM0001AFZZ

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

recorded.

Entering the TEST mode

1. Setting at port (in standby state, disc-free state or power nonconnected state)

(1) Set the port as follows. TEST1 : "Low" TEST0 : "High" (2) Press the PLAY button in the standby state (it is allowed to

close the disc lid or to connect the power supply).

(3) Test Mode STOP [ T E S T _ ]

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

Test mode: Perform it with the remote control. (1) Press and hold the "PLAY MODE" button on the remote control

and press the "PLAY" button. (2) Release only the "PLAY MODE" button. (3) Press and hold only the "PLAY" button and press the "VOL-

UME–" button. (4) Normal mode setting initialization (BASS setting, VOLUME

setting, etc.) (5) Test Mode STOP [ T E S T _ ] (6) Press "VOLUME+" to check the microcomputer version. (7) Press "VOLUME–" to light up all the LCDs.

Leaving the TEST mode

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

indicating state or whole LCD lighting state. (2) EEPROM rewrite-enable area updating. (3) Change to standby state

Test Mode

1. AUTO 1 Mode • Perform preliminary automatic adjustment.

2. AUTO 2 Mode

3. TEST-PLAY Mode

4. TEST-REC Mode

5. MANUAL 1 Mode

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

AUTO1.

• Perform ATT (attenuator) automatic adjustment.

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

• Continuous playback from the specified address is performed.

• 1 line, 10 lines or 100 steps manual jump is performed.

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

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

• Continuous record from the specified address is performed.

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

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

• Temperature is displayed.

• Seeing the displayed adjustment value, perform

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

Shipping setting method

(1)

Insert the rechargeable battery. Do not close the compartment.

(2) Close the battery lid twice in succession while pressing the

VOLUME– button and the PLAY button on the main unit at the same time. (Turn on and off the power twice)

(3) Make sure the display changes from [INIT] to [BYE OK].

6. MANUAL 2 Mode

7. ERROR INFORMATION Mode • Error information is initialized

8. NORMAL Mode

9. EEPROM Mode

• Temperature is displayed.

• Seeing the displayed adjustment value, perform ATT (attenuator) manual adjustment.

• Continuous playback is performed (error rate display, jump test).

• Error information is displayed.

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

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

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

• Factors of digital servo are changed manually.

• 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.

– 12 –

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.

• 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. MANUAL1 Mode

• Adjustment item to be made in AUTO1 mode is performed manually.

• When the VOLUME+ button is pressed during adjustment, the setting increases, and the new setting is output.

• When the VOLUME– button is pressed during adjustment, the setting decreases and the new setting is output.

• If the VOLUME+/– button is held down, the setting changes continuously with 100 ms cycle.

*In this operation, the setting change is performed for each digit. The

digit is changed by pressing the MODE button.

• If the setting is within the allowable range, the RANDOM display lights.

• When the STOP button is pressed during MANUAL1 menu or measurement or adjustment, the state is changed to the TEST mode stop state.

4. MANUAL2 Mode

• Adjustment item to be made in AUTO2 mode is performed manually.

• When the VOLUME+ button is pressed during adjustment, the setting increases, and the new setting is output.

• When the VOLUME– button is pressed during adjustment, the setting decreases and the new setting is output.

• If the VOLUME+/– button is held down, the setting changes continuously with 100 ms cycle.

*In this operation, the setting change is performed for each digit. The

digit is changed by pressing the MODE button.

• If the setting is within the allowable range, the RANDOM display lights.

• When the STOP button is pressed during MANUAL2 menu or measurement or adjustment, the state is changed to the TEST mode stop state.

• When the PLAY button is pressed in B-ATT set state, the mode is changed to the continuous playback mode.

• As for operation during continuous playback refer to "TEST-PLAY mode explanation".

MD-MT877/MD-MT877C

5. 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 FAST FORWARD/REVERSE button is changed as follows.

0032 — 0032 — 0032 — 0032 —

• When the FAST FORWARD 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 FAST REVERSE 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 FAST FORWARD/REVERSE 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 — 100 step — 1

* After the number of jump lines is indicated for one second, the

address indication is restored. [ T R ] or [ 100 stp ]

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

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

* When the FAST FORWARD/REVERSE 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 [ S Q ]

(SUBQ address indication) Continuous playback [ C E ]

(C1 error indication) Continuous playback [ S Q ]

(SUBQ address indication) * Recordabl disk

Continuous playback [ A P ] (ADIP address indication)

Continuous playback [ C E ] (C1 error indication)

Continuous playback [ A E ] (ADIP error indication)

Continuous playback [ A P ] (ADIP address indication)

– 13 –

MD-MT877/MD-MT877C

6. 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.

• 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 FAST FORWARD/REVERSE button changes as follows.

0032 — 0032 — 0032 — 0032 —

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

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

* When the FAST FORWARD/REVERSE button is held down, the

setting changes continuously, one cycle being 100 ms.

• When the VOLUME+/– button is pressed in the TEST-REC mode or continuous record mode, the laser record power changes. (Servo gain changes also according to record power.)

* After the laser record power is indicated for one second, the ad-

dress indication is restored. [ R P W _ ]

• : Address

• : Laser power cord

• Operation is disabled if the premastered disc or disc is in miseraseprotected state.

7. 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

• 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 cancelled, and the power is turned off.

: Internal mode : Address (Cluster section) : Address (Sector section)

8. Error data display Mode

• Reversing when FAST REVERSE 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

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 32h : P-TOC read failure 42h : U-TOC read failure 44h : U-TOC write data write disabled/read check error 45h : U-TOC write test failure 52h : SD write data write disabled 72h : EEPROM data read check sum error 73h : Record head drive disabled (by EJECT lever) 91h : Ambient temperature is higher that the allowable temperature

Error messages

Can't READ

The details ' '

'f': Focus 'a': Servo adjustment 's': Track such 'r': TOC information reading 'u': UTOC information reading 'w': At the time of data writing 'p': Spindle start

Er-MD

The details ' '

'41': UTOC light test error '80': EEPROM information reading error

– 14 –

EEPROM (IC402) writing procedure

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

(1) Replace EEPROM. (2) Refer to the latest EEPROM data list. (3) Start the test mode. (Refer to page 12 "Entering the

TEST mode".)

(4) Version display (At the time of settlement of the test

mode by the button operation.)

[ V e r . ]

EEPROM version (c ~ z) Microcomputer ROM

version (5) The whole LCD lights.

(6) Test mode stop state.

[ T E S T ]

2. Temperature reference setting method

[1] Measurement, calculation and setting procedure

(1) Set the TEST mode. (2) Start the EEPROM mode 'Temp' menu.

• Button operation in order of BASS, FAST REVERSE x

1 time, PLAY, PLAY in the test mode STOP state.

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

(3) Once press FAST FORWARD, and determine the dis-

played microcomputer TEMP input AD value.

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

MD-MT877/MD-MT877C

(7) Press the "BASS" button, and press 1 time the "FAST

REVERSE" button.

[ E E P R O M ]

(8) Perform the operation to display "EEPROM SETTING

MODE CHART", compare the EEPROM DATA LIST with the display, and set according to the EEPROM DATA LIST with the VOLUME+ or VOLUME– button.

(9) Set the temperature reference. (Refer to the Tempera-

ture reference setting method.)

(10) Set according to the EEPROM DATA LIST.

(11) Press the STOP button.

[ T E S T ] (12) Press the STOP button. (13) After data is written in EEPROM, turn off power .

(4) At the ambient temperature, determine the tempera-

ture corrected value from the temperature measurement value correction table.

(5) Determine the temperature reference, using the follow-

ing formula.

• Temperature reference = Microcomputer TEMP input

AD value + Temperature corrected value.

(6) Set the temperature reference value by button opera-

tion, and check whether the temperature code indication corresponds to "Temperature Code Identification Table".

[2] Temperature measurement value correction table

Ambient

temperature

+ 8oC ~ +10oC - 05h + 9.1oC +11oC ~ +13oC - 04h + 12.0oC +14oC ~ +16oC - 03h + 14.9oC +17oC ~ +19oC - 02h + 17.8oC +20oC ~ +22oC - 01h + 20.7oC +23oC ~ +25oC ± 00h + 23.6oC +26oC ~ +28oC + 01h + 26.9oC +29oC ~ +30oC + 02h + 29.4oC +31oC ~ +33oC + 03h + 32.3oC

Temperature

correction

Center

temperature

[3] Temperature code identification Check that the temperature code indicated after the servo control corresponds to the temperature limits below

Ambient

temperature

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

+ 3oC ~ +21oC 07h + 12.0oC +15oC ~ +33oC 06h + 23.6oC +26oC ~ +43oC 05h + 35.0oC

Temperature

correction

Center

temperature

– 15 –

MD-MT877/MD-MT877C

EEPROM DATA LIST (EEPROM version C)

Fucus setting

Item display

FG1 _ 44H FG2 _ 70H FF0 _ 10H FF1 _ 70H FF2 _ E8H Ff0 _ 10H Ff1 _ 48H Ff2 _ EAH FZH _ EDH FLn _ 09H FLp _ 06H DJG _ 0F H FSS _ 28H FTS _ 18H FSB _ 40H FTB _ 38H FGM _ 66H TVG _ 84H TO1 _ 50H TO5 _ 58H TOR _ 58H

Tracking setting

Item display

TG1 _ 14H TG2 _ 2AH TF0 _ 10H TF1 _ 70H TF2 _ E0H Tf0 _ 10H Tf1 _ 40H Tf2 _ E4H TFS _ 00H TBo _ 20H TBt _ 12H TKo _ 20H TKt _ 0DH TDo _ 67H TDt _ 34H SCo _ 00H SCt _ 3AH SCm _ 48H CLp _ 24H CLr _ 30H JPI _ 0EH K10 _ 65H THP _ 02H THG _ 02H TOP _ 00H TOG _ F4H T1P _ 20H

Set values

Spindle setting

Item display

SPG _ 30H SPi _ 9AH SPm _ 62H SPo _ 4FH PGM _ E0H SP1 _ 10H SP2 _ 60H SP3 _ F2H SP4 _ F2H SP5 _ 10H Sp2 _ 60H Sp5 _ 10H SD1 _ 7FH SD2 _ 7FH SPK _ EB H MPG _ 28H SPL _ 60H SPW _ 0FH SPB _ 66H SRi _ C0H SRm _ 9AH SRo _ 7BH

Sled setting

Item display

SKS _ 7F H SKL _ 7FH SLC _ 24H STL _ 07H STM _ 42H STE _ A6H SDV _ 60H SJP _ 03H WTm_ 18H SRV _ 54H SLT _ 5CH MVS _ 0AH SLS _ 28H SKE _ 0EH SDE _ 1CH

Set values

– 16 –

MD-MT877/MD-MT877C

BASS setting

Item display

B1A _ 3FH B1B _ 00H B1C _ 00H B2A _ 1FH B2B _ 00H B2C _ 00H B3A _ E2H B3B _ 00H B3C _ 00H

ADJ.SET setting

Item display

COK _ 28H FAT _ C0H TAT _ 3EH CAT _ 40H FAB _ H

Digital EQ setting

Item display

HQ1 _ 90H HQ2 _ 90H HSG _ 11H HSO _ FDH LQ1 _ 90H LQ2 _ 90H LSG _ 11H LSO _ 00H GQ1 _ 98H GQ2 _ 84H GSG _ 11H EQP _ 00H

Set values

Control setting

Item display

CT0 _ 02H CT1 _ 01H CT2 _ 30H CT3 _ 20H CT4 _ D0H CT5 _ 4BH CT6 _ 18H RC0 _ C0H RC1 _ FEH SYC _ A6H PWL _ 54H DR1 _ 24H DR2 _ 22H IN1 _ 17H IN2 _ 11H INH _ 00H DRH _ 64H PLE _ A6H RCE _ 94H ELT _ A0H X2T _ C0H SDF _ 1F H CHV _ 50H DRS _ 5AH DUP _ 00H RFL _ D0H CG1 _ 66H FB0 _ FCH RST _ 00H R20 _ 80H R21 _ 20H R40 _ BFH R41 _ 02H FBL _ 16H MC2 _ 00H MC4 _ 00H L2H _ 81H L4H _ 80H SPM _ 00H MSL _ 80H US0 _ 00H US1 _ 00H US2 _ 00H

Set values

– 17 –

+ 39 hidden pages