Sharp MD-C2 Service Manual

MD-C2

SERVICE MANUAL

No.S4916MDC2////

MD-C2

MD-C2 MD mini system Consisting of MD-C2(Main unit) and CP-MDC2(Speaker system).

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

CONTENTS

Page

INPORTANT SERVICE NOTES (FOR U.S.A. ONLY) ........................................................................................................2

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

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

OPERATION MANUAL .......................................................................................................................................................7

DISASSEMBLY.................................................................................................................................................................. 9

REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 14

ADJUSTMENT ................................................................................................................................................................. 18

EEPROM WRITING PROCEDURE ..................................................................................................................................25

EXPLANATION OF ERROR DISPLAY.............................................................................................................................27

EXPLANATION OF MECHANISM ERROR ......................................................................................................................28

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 29

TYPE OF TRANSISTOR AND LED ................................................................................................................................. 30

BLOCK DIAGRAM ........................................................................................................................................................... 31

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD............................................................................................. 36

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 64

WAVEFORMS OF MD CIRCUIT ..................................................................................................................................... 65

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 67

TROUBLESHOOTING (AMP SECTION)..........................................................................................................................71

TROUBLESHOOTING (MD SECTION) ........................................................................................................................... 72

FUNCTION TABLE OF IC................................................................................................................................................ 77

REPLACEMENT PARTS LIST/EXPLODED VIEW/PACKING OF THE SET (FOR U.S.A. ONLY) QUICK GUIDE

SHARP CORPORATION

– 1 –

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

MD-C2

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

IMPORTANT SERVICE NOTES (For U.S.A.Only)

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard) Before returning the audio product to the user, perform the following safety checks.

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the audio product.

2. Inspect all protective devices such as insulating materials, cabinet, terminal board, adjustment and compartment covers or shields, mechanical insulators etc.

3. To be sure that no shock hazard exists, check for leakage current in the following manner.

* Plug the AC line cord directly into a 120 volt AC outlet. * Using two clip leads, connect a 1.5k ohm, 10 watt resistor

paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as conduit or electrical ground connected to earth ground.

* Use a VTVM or VOM with 1000 ohm per volt, or higher,

sensitivity to measure the AC voltage drop across the resistor (See diagram).

* Connect the resistor connection to all exposed metal parts

having a return path to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor.

VTVM

AC SCALE

1.5k ohms 10W

0.15 µ F

TO EXPOSED METAL PARTS

All check must be repeated with the AC line cord plug connection reversed. Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. AC.) or more is excessive and indicates a potential shock hazard which must be corrected before returning the audio product to the owner.

TEST PROBE

CONNECT TO KNOWN EARTH GROUND

– 2 –

MD-C2

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

SPECIFICATIONS

MiniDisc recorder section

Type: 3-disc multi-play MiniDisc re-

corder

Signal readout: Non-contact, 3-beam semi-

conductor laser pickup

Audio channel: Stereo; 2 channels

Monaural (Playback only); 1 channel (long-time recording mode)

Frequency response: 20 - 20,000 Hz Rotation speed: 400 - 900 rpm CLV, Approx Quantization: 16-bit linear (CD recording)

20-bit linear (Analogue recording)

Error correction: ACIRC (Advanced Cross Inter-

leave Reed-Solomon Code)

Coding: ATRAC (Adaptive TRans-

formed Acoustic Coding)

Recording method: Magnetic field modulation over-

write method

D/A converter: 1-bit D/A converter Sampling frequency: 44.1 kHz Wow and flutter: Unmeasurable

(less than 0.001% W. peak)

Signal/noise ratio: 95 dB (1 kHz) Dynamic range: 90 dB (1 kHz)

Compact disc player section

Type: 3-disc multi-play compact

disc player

Signal readout: Non-contact, 3-beam semi-

conductor laser pickup

Rotation speed: 200 - 500 rpm CLV, Approx. Error correction: CIRC (Cross Interleave Reed-

Solomon Code)

Quantization: 16-bit linear D/A converter: 1-bit D/A converter Frequency response: 20 - 20,000 Hz Signal/noise ratio: 95 dB (1 kHz) Dynamic range: 90 dB (1 kHz) Wow and flutter: Unmeasurable

(less than 0.001% W. peak)

Tuner section

Frequency range: FM; 87.5 - 108 MHz

AM; 530 - 1,720 kHz

Sensitivity: FM; 2.5

(75 ohms unbalanced) AM; 650

V/m

Cassette deck section

Type: Compact cassette tape Frequency response: 50 - 14,000 Hz (Normal tape) Motor: DC motor with electronic governor Signal/noise ratio: 50 dB (Recording/Playback) Bias and erasure system: AC Tape speed: 1-7/8 ips. (4.76 cm/sec.) Wow and flutter: Heads: Record/playback

0.15 % (WRMS) Erase

General

Power source: AC 120 V, 60 Hz Power consumption: Stand-by; 0.6W

Power on; 112W 50 wats minimum RMS per channelOutput power: into 6 ohms from 60 Hz to 20 kHz,

Input terminals: Auxiliary (Analogue); Output terminals: Headphones; 16 - 50 ohms

Dimensions: Width; 10-11/16" (270 mm)

Weight: 19.0 lbs. (8.6 kg)

10% total hamonic distortion 500 mV/47 kohms

(recommended; 32 ohms) Speakers; 6 ohms

Height; 13-7/8" (352 mm) Depth; 14-13/16" (376 mm)

CP-MDC2

Speaker section

Type: 3-way type [5" (130 mm) woofer,

2-1/2" (50 mm) tweeter and super tweeter]

Maximum input power: 100 W Rated input power: 50 W Impedance: 6 ohms Dimensions: Width; 8-11/16" (220 mm)

Height; 13-7/8" (352 mm) Depth; 10-1/4" (260 mm)

Weight: 7.1 lbs. (3.2 kg)/each

Specifications for this model are subject to change without prior notice.

– 3 –

MD-C2

Front panel

11.

(CD) Disc Skip Button

12.

(CD) Select/Direct Play Buttons

13.

(CD) Open/Close Button

14.

(CD) Disc Tray

15.

Surround Button

16.

Extra Bass Button

17.

Pre-programmed Equalizer Button

18.

Timer Set Indicator

19.

(MD) Record Stand-by Button

10.

(TAPE) Record Stand-by Button

11.

Dimmer Button

12.

MD Illumination

13.

MD Release Button

14.

Timer Button

15.

Sleep Button

16.

Clock Button

17.

Power Button

18.

(MD) Select/Direct Play Buttons

19.

(TUNER) Tuning Down Button (MD/CD) Track Down/Review Button (TAPE) Rewind Button MD Compartment

20.

(TUNER) Tuning Up Button

21.

(MD/CD) Track Up/Cue Button (TAPE) Fast Forward Button

22.

(MD) Eject Buttons

23.

CD MD Edit Button

24.

Function Selector Buttons

25.

Auxiliary Input Button

26.

Volume Control (MD/CD/TUNER) Memory Button

27.

(MD) Name/TOC-Edit Button

28.

(MD/CD) Delete/Clear Button

29.

(MD/CD/TAPE) Stop Button

30.

Jog Dial

31.

(MD/CD) Play/Pause Button

32.

(TAPE) Play Button Display Button

33.

(MD/CD/TUNER) Enter Button

34.

(MD/CD) Play Mode Button

35.

NAMES OF PARTS

5 6

173118 19

27 28 29

8 9

13 141115

22 2320

32 33 34 35

Headphone Jack

36.

Cassette Compartment

37.

– 4 –

Display window

11. (MD/CD) Random Play Indicator

12. Timer Play Indicator

13. Timer Record Indicator

14. (MD/CD) Repeat Indicator

15. (MD/CD) Play Indicator

16. Memory Indicator

17. (TAPE) Record Indicator

18. (MD) Record Indicator

19. (MD/CD) Pause Indicator

10. Total Time Indicator

11. Extra Bass Indicator

12. Remaining Time Indicator

13. Surround Indicator

14. Sleep Indicator

15. Over Indicator

FM Stereo Mode Indicator

16.

FM Stereo Indicator

17.

18.

TOC Indicator

19.

Disc Indicator

20.

Track Indicator

21.

(MD) Disc Number Indicators

22.

(CD) Disc Number Indicators Level Meter/Volume Level Indicator

23.

3 4

21 22

MD-C2

10 11

12 13

14 15

6 7

Rear panel

11. AC Power Input Jack

12. AM Loop Aerial Terminal

13. Antenna Ground Terminal

14. FM 75 Ohms Antenna Terminal

15. Auxiliary (Audio Signal) Input Jack

16. Demo Switch

17. Speaker Terminals

CP-MDC2

Speaker section

11. Super Tweeter

12. Tweeter

13. Woofer

14. Speaker Grille

15. Speaker Wire

2 3 4

6 7

1 2

– 5 –

MD-C2

Remote control

11.

Remote Control Transmitter LED

12.

(TUNER) Preset Up/Down Buttons (MD/CD) Clear Button

13.

MD Time Button

14.

15.

(TAPE) Record Stand-by Button

16.

(MD) Record Stand-by Button (MD/CD) Select/Direct Play Buttons

17.

(MD/CD) Memory Button

18.

19.

(MD/CD) Enter Button

10.

(MD/CD) Track Down/Review Button (TAPE) Rewind Button (MD/CD) Track Up/Cue Button

11.

(TAPE) Fast Forward Button (MD/CD) Play/Pause Button

12.

(TAPE) Play Button (MD/CD/TAPE) Stop Button

13.

(MD/CD) Play Mode Button

14.

15.

Surround Button Pre-programmed Equalizer Button

16.

Extra Bass Button

17.

18.

Function Selector Buttons

19.

On/Stand-by Button Dimmer Button

20.

Volume Up/Down Buttons

21.

2 7

3 4

1213

8 9

10 11

15 16 17

18 19

– 6 –

OPERATION MANUAL

SETTING THE CLOCK

Press the POWER button to turn the power on.

Press the CLOCK button.

Within 5 seconds, press the ENTER button.

Turn the jog dial to select the time display mode.

"0:00"

The 24- hour displa y will appear .

(0:00 - 23:59)

"12:00 AM"

The 12-hour display will appear.

(AM or PM 12:00 - 11:59)

"0:00 AM"

The 12-hou r display will appear.

(AM or PM 0:00 - 11:59)

Note that this can only be set when the unit is first installed

or it has been reset.

Press the ENTER button.

Adjust the hour by turning the jog dial.

When the jog dial is turned one click clockwise, the time will

increase by 1 hour. When it is turned one click counterclock-

wise, the time will decrease by 1 hour.

Keep turning the jog dial to change the time continuously.

When the 12-hour display is selected, "AM" will change auto-

matically to "PM".

Press the ENTER button.

Adjust the minutes by turning the jog dial.

When the jog dial is turned one click clockwise, the time will

increase by 1 minute. When it is turned one click counterclock-

wise, the time will decrease by 1 minute.

Keep turning the jog dial to change the time continuously.

The hour setting will not advance even if minutes advance from

"59" to "00".

Press the ENTER button.

The clock starts operating from "0" seconds.

(Seconds are not displayed.)

Note:

In the event of a power failure or when the AC power cord is

disconnected, the clock setting will be lost. Reset the time.

12:00 AM 0:00 AM0:00

To change the clock time:

Press the CLOCK button.

Within 5 seconds, press the ENTER button.

Perform steps 6 - 9 above.

To see the time display:

Press the CLOCK button.

The time display will appear for about 5 seconds.

To change the time display mode:

Perform steps 1 - 2 in the section "RESETTING THE

MICROCOMPUTER".

Perform steps 1 - 9 above.

In this example, the clock is set for the

12-hour (12:00 AM) system.

Jog dial

CLOCK

POWER

ENTER

RESETTING THE MICROCOMPUTER

If 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 or the display may not function correctly. If such

a problem occurs, do the following:

To erase all of the stored memory contents (clock and timer

settings, and tuner, MD and CD presets).

If the display is not correct.

If the operation is not correct.

Press the POWER button to enter the stand-by mode.

Press the POWER button while holding down the button

and the DELETE/CLEAR button.

Caution:

The operation explained above will erase all data stored in

memory including clock and timer settings, and tuner, MD and

CD presets.

1,2

CD playback

SYMPTOM

POSSIBLE CAUSE

REMEDY

Even though a disc has been loaded,

"CD NO DISC" is displayed.

Playback stops in the middle of a

track, or playback is not performed

properly.

Playback sounds are skipped.

The disc is loaded up-side down.

The disc is very dirty.

The disc does not meet the CD stand-

ards.

Is the unit located near excessive

vibrations?

Has condensation formed inside the

unit?

Load the disc with the correct side up.

Clean the disc.

Load the correct disc.

Place the unit on a firm, level surface

free from vibration.

Remove the disc and leave the power

turned on. The unit should function

properly in about 1 hour.

MD recording and playback

SYMPTOM

POSSIBLE CAUSE REMEDY

TROUBLESHOOTING

If a problem occurs

If this unit functions abnormally during operation, first check the following items. If the unit continues to function abnormally,

or if an abnormality appears other than listed below, turn off the player's power and disconnect the AC power plug, then

consult your SHARP dealer or service personnel.

General

SYMPTOM

POSSIBLE CAUSE

REMEDY

The clock is wrong.

Did a power failure occur?

Try setting it again.

When a button is pressed, the unit

does not respond.

Set this unit to the stand-by mode and

then turn it back on. Then, retry the

operation.

Unplug the power cord from the AC

outlet. Then, plug it in again and retry

the operation.

No sound is heard.

Is the volume level set to "0"?

Are the headphones connected?

Are the speaker wires disconnected?

Were the speaker wires short-circuited

while being connected?

Increase the volume level.

Disconnect the headphones.

Connect the wires securely.

Unplug the power cord from the AC

outlet and then plug it in again.

Radios make unusual noise or the pic-

ture on the TV screen is distorted.

When a radio or TV which uses an in-

door antenna is placed near the unit,

the picture on the TV screen may be

distorted or the radio may not function

properly.

It is recommended that you use an ex-

ternal antenna.

MD-C2

– 7 –

MD-C2

A recording cannot be made.

Is the MiniDisc protected against ac-

cidental erasure?

Did you try to make recording on a

playback-only MiniDisc?

Can you see the "DISC FULL" or

"TOC FULL ∗" message in the dis-

play?

(∗ will be replaced by a number or

symbol)

Slide the accidental erase prevention

tab back to its original position.

Replace it with a recordable disc.

Put in another recordable disc with

recording space on it.

Even though a disc has been loaded,

"MD NO DISC" or "MD ∗∗ ERR" is

displayed.

(∗ will be replaced by a number or

symbol)

Playback sounds are skipped.

The disc is very dirty.

Is the unit located near excessive

vibrations?

Has condensation formed inside the

unit?

Clean the disc.

Place the unit on a firm, level surface

free from vibration.

Remove the disc and leave the power

turned on. The unit should function

properly in about 1 hour.

Tape recording and playback

SYMPTOM

POSSIBLE CAUSE REMEDY

A recording cannot be made.

Is the tape protected against acciden-

tal erasure?

Cover the accidental erase prevention

hole.

Sound is skipped.

Sound in high-frequency range can-

not be reproduced.

Sound quivers.

The tape is damaged.

The capstan and pinch roller are very

dirty.

Replace the tape.

Clean the capstan and pinch roller.

The cassette cannot be ejected.

Did a power failure occur?

Wait until the power is supplied.

Radio reception

SYMPTOM

POSSIBLE CAUSE REMEDY

Radios make unusual noise consecu-

tively.

The unit is placed near the TV or

computer.

The antenna direction is not placed

properly.

When the unit receives a radio broad-

cast near a TV set, a computer or a

wordprocessor, it may pick up noise. If

this happens, try to move the unit from

the place where the noise is picked up.

Correct the antenna direction.

The preset channel cannot be

recalled.

Did you erase the programmed sta-

tion?

Did you leave the power cord un-

plugged for a long time?

Preset the channel again.

Redo programming.

Remote control

SYMPTOM

POSSIBLE CAUSE REMEDY

The remote control does not function

or does not operate properly.

The batteries (polarity) are not in-

serted properly.

The batteries inside the remote con-

trol are dead.

The remote control is operated from

an incorrect distance or angle.

Insert properly.

Replace the batteries.

Operate it within a range of 8" (0.2 m)

to 20' (6 m) and within an angle of 15°

to either side of center.

The power cannot be turned on from

the remote control.

Is the AC power cord plugged in?

Connect the AC power cord.

When an error message is displayed, proceed as follows:

Error messages

Meaning Remedy

BLANK MD

Nothing is recorded.

Replace it with another disc.

Can't EDIT

A track cannot be edited.

Change the stop position of the track and then

try editing it.

Can't REC

Recording cannot be performed correctly due

to vibration or shock in the unit.

The tape is protected against accidental

erasure.

Re-record or replace the MiniDisc.

Cover the accidental erase prevention hole.

U TOC ∗ ERR

(∗ will be replaced

by a numb er or

symbol)

TOC information recorded on the MD does not

match the MD specifications or it cannot be

read.

Replace it with another disc.

Erase all of the track, and try recording.

U TOC W ERR

The TOC information could not be created

properly due to a mechanical shock or to

scratches on the disc.

Turn off the power, and try to write the TOC

again.

(Remove any source of shock or vibration

while writing.)

? DISC

The data contains an error.

Replace it with another disc.

00:00

Music is not being recorded.

Replace the disc with another recordable disc.

CD NO DISC

A CD has not been loaded.

The disc data cannot be read.

Load a CD.

Reload the CD.

DEFECT

Since this disc has scratches on it, the record-

ing operation was skipped.

Replace it with another recordable disc.

DISC FULL

The MiniDisc is out of recording space.

Replace it with another recordable disc.

EDIT OVER

There is no space to make CD editing on the

disc.

Replace it with a disc that has enough time

to record.

FOCUS ERR

A disc has not been loaded.

The disc data cannot be read.

Reload the MiniDisc.

MD ∗∗ ERR

(∗ will be replaced

by a number or

symbol)

The disc is damaged.

A TOC is not written on the MD or there is

something wrong with data.

Reload the disc or replace it.

MD ERR

Trouble is found.

Contact the shop where you purchased the

unit.

MD NO DISC

A MiniDisc has not been loaded.

The disc data cannot be read.

Load a MiniDisc.

Reload the MiniDisc.

MECH ∗ ERR

(∗ will be replaced

by a numb er or

symbol)

There is a mechanical problem and the disc

is not working properly.

Set this unit to the stand-by mode and press

the MD EJECT button.

NAME FULL

The number of characters for the disc name

or track name exceeds 40.

Shorten the disc or track name.

NOT AUDIO

The data recorded on this disc is not audio

data.

Select another track.

Replace the disc.

PLAY MD

You tried to record on a playback-only MD.

Replace it with another recordable disc.

PROTECTED

The disc is write protected.

Move the write protection tab back to its

original position.

TEMP OVER

The temperature is too high.

Set this unit to the stand-by mode and wait

for a while.

TOC ∗∗ ERR

(∗ will be replaced

by a num ber or

symbol)

The disc is damaged.

TOC information cannot be read.

MD not specified.

Replace it with another disc.

TOC FULL∗

(∗ will be replaced

by a number or

symbol)

There is no space left for recording character

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

Replace it with another recordable disc.

TOC W ERROR

Recording is impossible.

Contact the shop where you purchased the

unit.

TRAY ERROR

The CD tray operates incorrectly.

Unplug the AC power cord, plug it back, and

then turn the power on.

(Continued)

– 8 –

DISASSEMBLY

MD-C2

Caution on Disassembly

The disassembling the machine or assembling it after repair, observe the following instructions so as to ensure safety and keep its performance.

1. Unload the compact disc, and mini-disc, casette tape from machine.

2. Be sure to unplug the power cable before starting disassemble of the machine.

3. When disassembling each section, remove the nylon band or wire arrangement. After servicing the unit, be sure to rearrange the leads where they were before disassembling.

If a screw of improper length is fit to the MD mechanism.

(a screw fit the part to the mechanism chassis of MD section), it may contact the optical pickup, impeding normal operation. Hence, due care must be taken.

4. While repairing, pay utmost attention to static electricity on ICs.

MD-C2 MAIN UNIT

STEP

1 Cabinet 1. Screw ................ (A1) x4 9-1

2 Side Panel 1. Screw ................ (B1) x10 9-1

3 CD Tray Cover 1. Hook.................. (C1) x3 10-1

4 CD Player Unit 1. Screw ................ (D1) x1 10-1

5 Rear Panel 1. Screw ................ (E1) x9 10-1

6 MD Changer Unit 1. Screw ................ (F1) x5 10-3

7 Power PWB 1. Socket ............... (G1) x2 10-3

9 Tuner PWB 1. Screw ................ (J1) x3 10-4

10 Main PWB 1. Socket ............... (K1) x5 10-4

11 Front Panel 1. Screw ................ (L1) x3 10-5

12 Power Amp. PWB 1. Socket ............... (M1) x2 10-5

13 Tape Mechanism 1. Screw ................ (N1) x4 11-1

14 Headphone PWB 1. Screw ................ (P1) x1 11-1

15 Tray Switch PWB 1. Screw ................ (Q1) x4 11-2

16 Display PWB 1. Socket ............... (R1) x1 11-2

REMOVAL PROCEDURE

(Right,Left)

(Note 1)

2. Socket ............... (D2) x3

3. Hook.................. (D3) x2

(Note 2) 2. Flat Cable.......... (F2) x1

2. Screw ................ (G2) x2

MD Holder/Fan Motor

1. Screw ................ (H1) x7 10-3

2. Socket ............... (H2) x 1

2. Socket ............... (J2) x1

2. Screw ................ (K2) x3

2. Flat Cable.......... (L2) x1

3. Hook.................. (L3) x2

2. Screw ................ (M2) x4

2. Knob.................. (R2) x2

3. Nut..................... (R3) x1

4. Screw ................ (R4) x16

FIGURE

Note 1:The CD tray must be opened to remove the CD tray

cover. Open the CD tray using one of the following methods. After removing the CD tray cover, close the tray. (See Figure 10-1 and Figure 10-2.)

* Turn the power on and open the CD tray. * Insert the tip of a screwdriver into the hole

A on the top of the CD tray. Use the screwdriver to turn the worm gear 10 turns or more until the lock lever is released. After releasing the lock lever, manually push the CD tray out.

* Put the tip of the screwdriver into the hole on the lock

lever through the hole on the back of the CD player unit. Turn the screwdriver all the way in the direction indicated by the arrow to release the lock lever. Then, manually push the CD tray out.

Note 2:When removing or reinstalling the MD unit, avoid a

short circuit by being careful not to allow it to touch the PWB.

Note 3: After removing the connector for the optical pickup

from the connector wrap the conductive aluminium foil around the front end of connector so as to protect the optical pickup from electrostatic damage.

Cares after repairing

After completion of repair of product set the following shipping mode to return.

1. Make sure that there is not a CD disc in the tray. Press and hold the PRE-EQ and ENTER buttons, and then press the RESET switch (or plug in the AC cord) to enter the TEST mode.

2. After the indication of TEST END appears, unplug the power cord. If this test mode is executed, the data stored by the user in the preset memory are all cleared. It is necessary tell and obtain the consent of user in advance.

MD-C2 MAIN UNIT

(A1) x2 ø3 x12mm

Side Panel (Right)

(B1) x2 ø3 x12mm

Cabinet

Front Panel

(A1) x2 ø3 x12mm

Side Panel (Left)

– 9 –

Rear Panel

(B1) x6 ø3 x12mm

Figure 9-1

(B1) x2 ø3 x12mm

MD-C2

Main PWB

(K2) x2 ø3 x10mm

(K1) x2

(K1) x1

Main PWB

(J2) x1

Tuner PWB

(J1) x1 ø3 x10mm

PWB Bracket

(K2) x1 ø3 x10mm

(J1) x2 ø3 x10mm

Tuner PWB

Front Panel

Holder,PWB

Pwer Amp. PWB

(L1) x2 ø3 x10mm

(L1) x1 ø3 x 6mm

(M2) x4 ø3 x10mm

(L3) x1

(M1) x2

(L2) x1

Pull

CD Player Unit

Rear Panel

(D1) x1 ø3 x12mm

(E1) x2 ø3 x12mm

(D2) x3

(E1) x7 ø3 x12mm

(D3) x1

Pull

Figure 10-1

Lock Lever

CD Tray Cover

Hook (C1) x3

(D3) x1

Main PWB

Worm Gear

MD Chenger Unit

(H1) x2 ø3 x10mm

Holder,PWB

(G2) x2 ø3 x10mm

Power PWB

MD Holder

(H1) x2 ø3 x10mm

(H1) x1 ø3 x10mm

(G1) x2

Figure 10-2

(H2) x1

Pwer Amp. PWB

(F1) x5 ø3 x10mm

Figure 10-4

PWB Holder

(H1) x2 ø3 x18mm

Main PWB

(F2) x1

Figure 10-5

Figure 10-3

– 10 –

(A1) x1 ø3 x8mm

(A2) x2

CD Servo PWB

CD Player Unit

(A2) x2

(D1) x4 ø3 x12mm

(E1) x1 ø2.6 x10mm

CD Changer Mechanism

CD Mechanism

Shift Lever

Disc Tray Base

Tape Mechanism

(R2) x2

(R1) x1

(R3) x1

(Q1) x2 ø3 x10mm

(R4) x2 ø3 x10mm

(R4) x12 ø3 x10mm

JOG PWB

Washer

Display PWB

Bracket

Switch PWB

(N1) x4 ø3 x10mm

MD-C2

(P1) x1 ø3 x10mm

Headphones PWB

Figure 11-1

MD-C2 CD UNIT

STEP REMOVAL

1 CD Servo PWB 1. Screw ................ (A1) x1 11-3

(Note 3) 2. Socket ............... (A2) x4

2 Turntable 1. Screw ................ (B1) x1 11-4

3 CD Tray 1. Screw ................ (C1) x2 11-4

CD Changer Mechanism

5 CD Mechanism 1. Screw ................ (E1) x1 11-5

PROCEDURE

2. Stabilizer ........... (B2) x1

2. Guide................. (C2) x2

1. Screw ................ (D1) x4 11-5

FIGURE

(B1) x1 ø3 x10mm

Figure 11-2

(B2) x1

(C1) x1 ø3 x10mm

(C2) x1

Roading Chassis

(C2) x1

Figure 11-4 Figure 11-5

TurnTable

Disc Tray Base

(C1) x1 ø3 x10mm

Figure 11-3

– 11 –

MD-C2

MD-C2 MD UNIT

STEP REMOVAL

1 Shield Case 1. Screw ................ (A1) x7 12-1

2 MD Main PWB 1. Screw ................ (B1) x3 12-1

MD Changer Switch PWB

4 MD Relay PWB 1. Screw ................ (D1) x6 12-2,

/MD Mechanism 2. Screw ................ (D2) x5 13-2,3

(Note 3) 3. Socket ............... (D3) x3

When installing the MD changer switch PWB

O.K

N.G

PROCEDURE

2. Socket ............... (B2) x1

3. Flat Cable.......... (B3) x2

1. Screw ................ (C1) x3 12-1

Optical Pickup Flexible PWB ..

5. Flat Cable.......... (D5) x1

6. Nylon Band ....... (D6) x1

7. Screw ................ (D7) x4

(D4) x1

(C1) x3 ø2 x7mm

(A1) x1 ø3 x6mm

MD Changer Switch PWB

FIGURE

(A1) x2 ø3 x6mm

(A1) x1 ø3 x6mm

(B1) x3 ø2 x5mm

MD Main PWB

(B2) x1

N.G

Turn idler gear F and install the MD changer switch PWB with both SW levers A and B in the lowered position.

How to remove the mechanism block. (See Fig. 12-2.)

1. Press and hold the hook. Then turn idler gear F A counterclockwise to slide the lift lever backward.

2. Lift the section it.

Note: To reinstall the mechanism block, push in the section

C first, and then the section B .

B of the mechanism block first, and remove

Idler Gear F

Mechanism Block

Hook

(B3) x2

Figure 12-1

(D1) x2 ø2 x3mm

(D1) x4 ø2 x7mm

Lift Lever

Idler Gear F

Figure 12-2

– 12 –

(D2 ) x3

(D7) x4

(D6) x1

Mechanisum Holder

Screw Special

MD Mechanisum

Nylon Band

( A3 ) x2 ø3x10mm

( A3 ) x4 ø4x12mm

( A2 ) x1

Front Panel

Sper Tweeter

Tweeter

Woofer

Net

( A1 ) x1

ø2 x7mm

(NOTE3)

(D4) x1

ł›

MD-C2

(D2 ) x2 ø2 x7mm

Holder,PWB

(D3) x3

MD Relay PWB

(D5) x1

Figure 13-1

CP-MDC2 SPEAKER

STEP REMOVAL PROCEDURE FIGURE

1 Speaker 1. Net..................... (A1) x1 13-3

2. Front Panel ....... (A2) x1

3. Screw ................(A3) x6

Note: Before reinstalling the mechanism block, secure the

magnetic head lead wires to the mechanism holder using a nylon band.

Figure 13-2

Figure 13-3

– 13 –

MD-C2

,

REMOVING AND REINSTALLING THE MAIN PARTS

MD MECHANISM SECTION

For details about the procedure to remove the MD mechanism from the main unit, refer to the Disassembly Procedure, Steps 1 - 6 in the main unit and also the MD section. (Referring to p.9~13)

Caution:

After pulling out the optical pickup connector, wrap the

end of the connector in conductive aluminum foil to prevent the optical pickup from being destroyed by static electricity.

How to remove the magnetic head (See Fig. 14-1)

1. Remove the screws (A1) x 1 pc.

Caution:

Take utmost care so that the magnetic head is not

damaged when it is mounted.

How to remove the cartridge holder (See Fig. 14-2)

1. Turn idler gear C to move the roof lever to the front.

2. Move the spring hung on the roof move arm.

3. Remove the stop washer (B1) attached to the clamp arm

lever and the stop washer (B2) attached to the shaft.

4. Remove two springs (B3). To remove the cartridge holder,

slide it toward you and lift the side of the cartridge holder which has hooks on it.

Caution:

To reinstall the cartridge holder, insert the shaft first. The spring should be attached exactly as shown in

drawing

B .

MD Mechanism

Spring

The longer section of the hook should rest on the sheet metal.

Stop Washer (B1) x1

Turn idler gear C clockwise

Figure 14-1

Spring

Roof Move Arm

Stop Washer (B3) x1

Cartridgh Holder

(B2) x2

Spring

(A1) x1 ø1.7 x3mm

Magnetic Head

Cartridgh Holder

Shaft

Cartridgh Holder

Roof LeverClamp Lever

Roof Lever Hook

Roof Move Arm

View from C

How to remove the mechanism switch PWB (See Fig. 14-3)

1. Remove the screws (C1) x 2 pcs., and remove the mechanism

switch PWB.

Caution:

To reinstall the mechanism switch PWB, push the

PWB in the direction indicated by the arrow

A .

– 14 –

(C1) x1 ø1.7 x9.5mm

Figure 14-2

(C1) x1 ø1.7 x3mm

Switch PWB

Figure 14-3

MD-C2

(E1) x2

(E1) x1 ø1.7 x2.1mm

Spring

Metal

Spring

Turn Table

Spindle Motor

Screw,Special

View from A

How to remove the sled motor/loading motor (See Fig. 15-1)

1. Remove the screws (D1) x 4 pcs., and remove the sled motor/loading motor.

Caution:

Be careful so that the gear is not damaged. (The damaged gear emits noise during searching.)

How to remove the spindle motor (See Fig. 15-2)

1. Remove the screws (E1) x 3 pcs., and remove the spindle motor.

(D1) x2 ø1.7 x2mm

Loading Motor

Figure 15-1

Sled Motor

(D1) x2 ø1.7 x2mm

Caution:

Be careful so that the turntable is not damaged. To reinstall the spindle motor, the position of the spring should be as shown in the drawing.

How to remove the optical pickup (See Fig. 15-3)

1. Remove the screws (F1) x 3 pcs.

Caution:

Be careful so that the gear is not damaged. (The damaged gear emits noise during searching.)

(F1) x1 ø1.7 x9.5mm

Optical Pickup

Figure 15-2

(F1) x1 ø1.7 x3mm

(F1) x1 ø1.7 x9.5mm

Figure 15-3

– 15 –

MD-C2

Main Cam

Cam Idler Gear

Idler Gear C

Clamp Gear

Align the trianguler unit's shielding case so that you can see idler

The cam groove should be in the exact position shown in this drawing.

How to remove the MD lift Motor (See Fig. 16-1)

1. Remove the screws (G1)x 6 pcs., and remove the chassis.

2. Remove the screws (G2)x 2 pcs., and remove the gear box.

3. Remove the screws (G3)x2pcs., and remove the liftmotor. Caution:

Be careful so that gear is not damaged. (The damaged gear emits noise during searching.)

(G3) x2 ø1.7 x3mm

Gear Box

MD Lift Motor

Figure 16-1

(G2) x2 ø2 x5mm

Gear Box

(G1) x3 ø2 x4mm

Chassis

Note when engaging the gears (See Fig. 16-2)

How to remove the MD disc (When MD is in playback state) (See Fig. 16-3.)

1. Remove the MD changer unit's shielding case so that you can see idler gear C.

2. Remove the MD disc as shown in the figure.

MD Mechanism

MD Disc

Figure 16-2

Move the lift lever backward and lift the MD mechanism to the top position

Caution:

Be so that gear is not damaged. (The damaged gear emits noise during searching.)

– 16 –

Turn idler gear C counterclockwise

Figure 16-3

CD MECHANISM SECTION

( A1 ) x2 ø2.6 x6mm

Shaft ( A2 ) x1

Stop Washer ( A3 ) x1

Gear ( A4 ) x1

CD Mechanism

Optical Pickup

( B1 ) x2 ø2.6 x5mm

CD Changer Mechanism

Sift Lever

Cam Gear

Cam GearBelt

Motor PWB

Loading UP/Down Motor

For details about the procedure to remove the CD mechanism from the main unit, refer to Disassembly Procedure, Steps 1

- 4 in the main unit and also the CD section. (p.9~11).

How to remove the optical pickup (See Fig. 17-1.)

1. Remove the screws (A1)x 2 pcs., to remove shaft (A2)x 1 pc.

2. Remove stop washer (A3)x 1 pc., to remove gear (A4)x 1 pc.

3. Remove the optical pickup.

Note: After disconnecting the optical pickup connector wrap the front end of connector in conductive aluminum foil so as to prevent damage to the optical pickup by static electricity.

MD-C2

Figure 17-1

How to remove the loading up/down motor (See Fig. 17-2.)

1. Remove the screws (B1)x 2 pcs., to remove the loading motor.

Note: After replacing the part for the CD changer mechanism, the shift lever should not be lowered. It should be kept completely raised.

1.When the cam gear rotates with the belt disengaged, the shift lever will go up and fown.

2.When the shift lever is raised and the loading gear (CABNET EXPLODED view Fig15,No.276) on the bottom rotates, pulling the plunger, the shift lever will be locked.

Figure 17-2

– 17 –

MD-C2

ADJUSTMENT

When you need to remove the display PWB and main PWB for adjustment, use a prolongation cable for servicing.

Extension Cable (See Fig. 24-6)

1 Extension Cable (12 Pin) QCNWK0123AFZZ

Type

Part No.

TUNER SECTION

fL: Low-range frequency fH: High-range frequency

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage

IF 450 kHz 1,720 kHz T351 *1 Band — 530 kHz (fL): T304 *2

Coverage 1.1 ± 0.1 V Tracking 990 kHz 990 kHz (fL): T302 *1

*1. Input: Antenna, Output: TP302 *2. Input: Antenna, Output: TP301

• FM RF

Signal generator: 1 kHz, 75 kHz dev., FM modulated

Test Stage Instrument

Band — 87.5 MHz L303(fL): *1 Coverage 3.7V ± 0.1V

RF 98.0 MHz 98.0 MHz L302 *2

*1. Input: Antenna, Output: TP301 *2. Input: Antenna, Output: Speaker terminal

Frequency Frequency

(10-30 dB)

FM RF

IC301

FM IF AM IF

TP301

T351

IC302

CNP303

Display

SO301

L302

VD303

T301

VD304

L303

CF352

CF301

Adjusting

T302

T304

T352

C356

IC303

VR351

Setting/

Adjusting

Parts

Serring/

Point

Instrument

Connection

AM TRACKING fL

AM BAND COVERAGE fL

FM BAND COVERAGE fL

FM DET

TP302

TP303 VCO

• Detection

Signal generator: 10.7 MHz, FM sweep generator

Test

Stage

Frequency

Display

IF 10.7 MHz 98.0 MHz T301(Turn Input: Pin 1 of

Detection 10.7 MHz 98.0 MHz T352 Input: Pin 1 of

Adjusting

Parts

Instrument

Connection

the core of IC301 transformer Output: TP302 T352 fully counterclookwise.)

IC303 Output: TP302

• VCO Frequency

Frequency

Display

98.00 MHz 98.0 MHz VR351* Pin 13, Pin 21 (60 dB) and ground

Adjusting

Parts

Instrument

Connection

of IC303

* Adjust for 76 kHz ± 200 Hz.

Notes:

After preparing the test circuit shown in Fig 18-2, connect the Pin 13 , Pin 21 and ground of the IC303 with test circuit, and measure the Value. At this time, apply a standard unmodulated signal input and adjust the VCO.

Pin 13 of IC303

TP303

Pin 21 of IC303

FET : 2SK19 or 2SK54

10 kΩ

TO FREQUENCY COUNTER

Figure 18-2

• TEST mode setting method

Holding down the NAME/TOC EDIT key and

key, turn on POWER key switch. (Or plug in the AC cord.) Frequency is set in the memory (initial setting) as shown in Table 18. Call the setting with the JOG DIAL to use it for tuner circuit adjustment or confirmation.

Preset No. Frequency

P01 87.5 MHz P06 530 kHz P02 108.0 MHz P07 1,720 kHz P03 90.0 MHz P08 600 kHz P04 106.0 MHz P09 1,400 kHz P05 98.0 MHz P10 990 kHz

Preset No. Frequency

Table 18 Initial setting of memory

TUNER PWB

Figure 18-1 ADJUSTMENT POINT

TAPE SECTION

Adjusting the mechanism

Checking the playback/FF/rewinding torque

Torque Meter Specified Value

Play:TW-2111 30 to 60 g.cm Fast forward:TW-2231 60 to 120 g.cm Rewind:TW-2231 60 to 120 g.cm

• Erasing the registered broadcast station

When the power is off, press and hold the PROGRAM key and the

key, and then press the POWER key.

All the registered stations are erased.

Driving Force Check

Torque Meter Specified Value

Play:TW-2412 80 g or more

Tape Speed

Test Tape

Adjusting Point Specified Value

MTT-111 Volume in motor 3,000±30Hz Headphone

Instrument Connection

– 18 –

CD TEST MODE

CD test mode setting

Any one of test mode can be set by pressing several buttons as follows. Holding down CD DISC1 and

Test Mode Function - CD TEST mode

Setting of Test mode Indication of CD TEST mode OPEN/CLOSE operation is manual operation. The pickup can be moved with the (

MD EDIT> <PLAY MODE> <CD-STOP>

<CD Tracking on the spot. Tracking on the spot. STOP SERVO ON PLAY SERVO OFF PLAY <PLAY> button input - TOC. Initialization performed, and the ordinary PLAY is performed. Press the <STOP> button. Stop If the following button is pressed during PLAY, it is possible to specify directly any Track No.

Note:

Only in STOP state it is possible to slide the pickup with the ( Cancel method: POWER OFF

key, turn on POWER key.

Initialization is not performed.

) or ( ) button.

<CD Disc 1 PLAY> button: Track 4 <CD Disc 2 PLAY> button: Track 9 <CD Disc 3 PLAY> button: Track 15

) or ( ) button.

MD-C2

CD SECTION

Since this CD system incorporates the following automatic adjusting function, when the pickup is replaced, it is not necessary to the readjust it . Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.

Automatic adjustment items

1. Focus Offset (Fig. 19-1)

2. Tracking Offset (Fig. 19-2)

3. E/F Balance (Tracking Error Balance) (Fig. 19-3)

4. R/F level AGC function (HF level: Constant)

5. RF level automatic follow-up of the tracking gain This automatic adjustment is performed each time a disc

is changed. Therefore, each disc is played back using the optimal settings.

10ms

0.50 V IC1 20 FE

Enlarged View

0.1s

0.50 V IC1 20 FE

0.1s

0.50 V IC1 7 TE

200 ms 1V/diV IC 1 15

Figure 19-1

FOCUS OFF-SET ADJUST

TRACKING OFF-SET ADJUST

1 2

TRACKING/ ERROR BARANCE

ADJUST

10ms

0.50 V IC1 7 TE

Figure 19-2

TRACKING OFF-SET ADJUST

1 2

– 19 –

200 ms 1V/diV IC 1 7

Figure 19-3

MD-C2

MD SECTION

When the combination of mechanism/pickup and PWB was changed , set the TEST mode to perform the AUTO preliminary adjustment and AUTO adjustment, write the adjustment data in EEPROM. When EEPROM was replaced, set the TEST mode,write the EEPROM set data (p25,p26) and then perform the preliminary adjustment and AUTO adjustment, write adjustment data in EEPROM.

1. Preparation for adjustment

Test disc

Type Test disc

1 High reflection disc TGYS1 (SONY) [for Playback] RRCDT0101AFZZ 2 Low reflection disc Recording minidisc –––––––––––– 3 Head Adjusting transparent RRCDT0103AFZZ 4 Low reflection disc Pre-adjustment disc 88GMMD-318

[TEAC Test MD]

Extension Cable (See Fig. 24-5)

Type Part No.

1 Extension Cable (7 Pin) QCNWK0122AFZZ

Part No.

Execution item

required

Repair operations

TEMP

basic setting

TEMP

Checking

EEPROM setting EEPROM_SET

PICK replacement HEAD replacement

MECHANISM replacement

MAIN PWB assembly replacement

MD microcomputer replacement

MD LSI replacement RF IC replacement

EEPROM IC replacement

number , , , , and

indicate the order of inplementation.

" – " is an item that you don't have to execute.

AUTO-YOBI

adjustment

AUTO–YOBI

Writing the

EEPROM setting

Operation check

TEST-PLAY

TEST-REC

OK_EEPROM: "SET" and "YOBI COMPLETE" were written normally WR_EEPROM:

NG_EEPROM: "SET" could not be written.

The EEPROM writing result is shown at the end of the test mode

Although "SET" was written normally, it was not written in the "YOBI COMPLETE" state.

Peform "AUTO-YOBI" adjustment. After making a normal adjustment, write the preliminary adjustment into the EEPROM.

Check the connection between the MD microcomputer

– 20 –

MD-C2

2. Test mode

Test mode setting method

1. Holding down the MD1 PLAY button and FF( (State A is changed to state B .)

2. Load playback disc 1 (high reflection disc) or recording disc 2 (low reflection disc) into DISC 3, and press MD RELEASE. (State

C is set.)

Thus, the test mode state is set.

)button, press POWER button switch.

A tsm 1 6

e : TEST MODE represents version of MD microcomputer.

STOP state (When the MD2 PLAY button is ressed in the

is restored. To restore

C again, press the SURROUND button.)

C state, the indication A

B EJECT

C AUT YOBI

Entering the specific mode

Whenever the SURROUND button is pressed, the mode is changed.

AUTO pre-adjustment AUTO adjustment FAB adjustment RESULT Pre-adjustment

RESULT

ERR DATA EEPROM setting MANUAL adjustment MANUAL pre-adjustment

Cancel of TEST mode

To restore the usual state once reset. *Before pressing the POWER button, be sure to perform the AUTO preliminary adjustment and the AUTO adjustment. Make sure that they return a "COMPLETE" result. *When the data of EEPROM was changed or the preliminary adjustment was performed again, be sure to press the POWER button to write data in the EEPROM. (Data is written in the EEPROM by pressing the POWER button.) *When changing the EEPROM settings, write them into the EEPROM and then enter the test mode again. Perform the AUTO preliminary adjustment and the AUTO adjustment. Then, write those into the EEPROM.

• Test Mode

1. EJECT mode • TEMP setting (of EEPROM setting)

2. AUTO pre-adjustment mode • Automatic pre-adjustment is performed.

3. AUTO adjustment mode • Automatic adjustment is performed. (After adjustment the grating adjustment mode is set.)

• FAB adjustment mode • Therefore do not set this mode since it is not necessary for the service.

• RESULT sub-mode

• RESULT mode (final adjustment)

• MANUAL pre-adjustment mode

• MANUAL adjustment mode

• EER DATA mode

4. EEPROM setting mode • Various coefficients of digital servo are changed manually.

5. TEST-PLAY mode • Continuous playback from the specified address is performed.

6. TEST-REC mode • Continuous recording from the specified address is performed.

7. INNER mode • The position where the INNER switch is turned on is measured.

• CONTROL setting (of EEPROM setting)

• Setting of laser power (record/playback power)

• C1 error rate measurement, ADIP error rate measurement.

– 21 –

MD-C2

1. EJECT mode

Step No.

Step 1 Testmode EJECT state [ _ _ E J E C T _ _ _ ] Step 2 Press once the DISPLAY button. Playback power output state [ P P W _ _ _ _ _ _ _ ] Step 3 Press once the DISPLAY button. Record power output state [ R P W _ _ _ _ _ _ _ ] Step 4 Press once the DISPLAY button. Max. power output state [ X P W _ _ _ _ _ _ _ ] Step 5 Press the X-BASS button. TEMP setting of EEPROM setting Step 6 Press the EQUALIZER button. CONTROL setting of EEPROM setting

Confirmation of pickup laser power

It is possible to confirm in the record/playback mode with the aid of laser power meter. However, since the laser power meter measurement is characterized with dispersion, obtained data are used only for confirmation. Reference data (at room temperature 25°C) Playback: 0.72±0.1 mV Record: 5±1 mV Note: Never see directly the laser light. Otherwise your eyes are injured.

2. AUTO pre-adjustment mode (Low reflection disc only)

With the pre-adjustment disc (MMD-318)

Step No. Setting Method Display

Step 1 Testmode STOP state [ t s m16 e ] Step 2 Step 3 Press the MD1 PLAY button. • During automatic adjustment changes as follows. [ : _ _ _ _ _ _ ]

Step 4 Grating adjustment, [ _ C O M P L E T E _ ]

Step 5 Adjustment value output [ C a n ' t _ A D J . ]

Press once the SURROUND button.

End of adjustment If adjustment is OK, Step 4.

adjustment value output Press once the MD2 PLAY button.

Press once the MD2 PLAY button.

Setting Method

Remarks Display

Remarks

AUTO pre-adjustment menu [ _ A U T _ Y O B I _ ]

HAo→ • • • • • • • • • →LAO

If adjustment is NG, Step 5.

STEP 2 AUTO pre-adjustment menu

• : Adjustment name

3. AUTO adjustment mode

Step No. Setting Method Remarks Display

Step 1 Testmode STOP state The AUTO preliminary adjustment should have been completed. [ t s m e ] Step 2 Step 3

Step 4 Adjustment value output For grating adjustment [ _ C O M P L E T E _ ]

Step 5 Continuous playback (pit section) Confirmation of CI error [ s c ]

Step 6 Press the DISPLAY button. Confirmation of ADP error [ a a ]

Step 7 Adjustment value output [ C a n ' t _ A D J . ]

Press the SURROUND button two times. Press the MD1 PLAY button.

End of adjustment If adjustment is OK, Step 4.

Press the MD1 PLAY button. STEP 5 Press the MD2 PLAY button. STEP 2 AUTO adjustment

Continuous playback (groove section)

Press the MD2 PLAY button. STEP 2 AUTO adjustment menu

AUTO adjustment menu [ A U T O _ A J S T _ ] The slide moves to the innermost periphery, and automatic [ : _ _ _ _ _ _ ]

adjustment is started.

• In case of high reflection disc changes as follows. PEG→HAG

•In case of low reflection disc changes as follows. PEG→LAG→GCG→GEG→LAG

If adjustment is NG, Step 7.

[ a c ]

• : Adjustment name, : Measurement value, : Address

– 22 –

MD-C2

5. TEST-PLAY mode

(For comfirmation of the playback ability at the named address.)

Step No. Setting Method

Step 1 Testmode STOP state The AUTO preliminary adjustment should have been completed. [ t s m e ] Step 2 Press the X-BASS button. TEST-PLAY menu [ T E S T _ P L A Y _ ] Step 3 Press once the DISPLAY button. ADRES setting (Target address initial value is indicated) [ A D R E S _ 0 0 3 2 ]

Press once the MD1 PLAY button.

Step 4 Continuous playback (pit section) (Address + C1 error indication) [s c ]

Continuous playback (groove section)

Step 5 Press once the DISPLAY button. (Address + ADIP error indication) [a a ]

Continuous playback (groove section)

Step 6

• If the MD2 PLAY button is pressed while the TEST-PLAY menu is displayed, TEST mode STOP state is set.

• If the MD1 PLAY button is pressed while the TEST-PLAY menu is displayed, continuous playback is started from the current pickup position.

• Whenever the X-BASS button is pressed in the address setting mode, the address changes as follows.

• Whenever the DISPLAY button is pressed in the address setting mode, the digit which is changed with - / + changes as follows.

• The digit of address which has been specified with - / + and DISPLAY button in the address setting mode is set to +01H/-01H.(0~F)

* If the - / + button is held down, the setting changes continuously with 100 ms cycle.

Press once the MD2 PLAY button

0 0 3 2 → 0 3 C 0 → 0 7 0 0 → 0 8 A 0 → 0 9 5 0 → 0 0 3 2 → …………

0 0 3 2 → 0 0 3 2 → 0 0 3 2 → 0 0 3 2 → …………

(Address + C1 error indication) [a c ]

. TEST-PLAY menu [ T E S T _ P L A Y _ ]

6. TEST-REC mode

With recording mini disk (For confirmation of the playback ability at the named address.)

Step No. Setting Method Remarks Display

Step 1 Testmode STOP state The AUTO preliminary adjustment should have been completed. [ t s m e ] Step 2 Press the X-BASS EDIT button. TEST-REC menu [ T E S T _ R E C _ _ ] Step 3 Press once the DISPLAY button. ADRES setting (indication of address initial value) [ a 0 0 3 2 _ p w ] Step 4

Step 5

• If the MD2 PLAY button is pressed while the TEST-PLAY menu is displayed, TEST mode STOP state is set.

• If the MD1 PLAY button is pressed while the TEST-REC menu is displayed, continuous record is started from the current pickup position.

• Whenever the X-BASS button is pressed in the address setting mode, the address changes as follows.

• Whenever the CD STOP button is pressed in the address setting mode, the digit which is changed with - / + changes as follows.

• The digit of address which has been specified with - / + and CD STOP button in the address setting mode is set to +01H/-01H.(0~F) * If the - / + button is held down, the setting changes continuously with 100 ms cycle.

• Be sure to remove since excessive raising results in breakage of the pickup.

Press once the MD1 PLAY button.

Press once the MD2 PLAY button.

0 0 3 2 → 0 3 C 0 → 0 7 0 0 → 0 8 A 0 → 0 9 5 0 → 0 0 3 2 → …………

0 0 3 2 → 0 0 3 2 → 0 0 3 2 → 0 0 3 2 → …………

While searching, set the search output to "H". To start continuous play, return it to "L". Continuous recording

TEST-REC menu [ T E S T _ R E C _ _ ]

Remarks

Display

[ a p w ]

7. INNER mode

Step No. Setting Method Remarks Display

Step 1 Testmode STOP state [ t s m e ] Step 2 Press the EQUALIZER button. INNER menu [ _ _ I N N E R _ _ ] Step 3

Step 4

• : Address

Press once the MD1 PLAY button.

Press once the MD2 PLAY button.

INNER switch position measurement [s c ] (SUBQ address and C1 error are also indicated.)

INNER menu [ _ _ I N N E R _ _ ]

– 23 –

MD-C2

Lead-in switch position measurement mode

Insert High reflection test disk (TGYS1) Note: Adjust the lead-in switch position to FF85 to FFDF.

1. Loosen the screw (A) x 2 pcs. which fix the mechanism switch PWB.

2. Retighten the screw, pressing the mechanism switch PWB in the arrow direction, and then measure the lead-in switch position again.

After position adjustment fix with the two screws (A). (See Fig. 24-1.) Note: After tightening the two screws on the PWB apply Screw Lock.

Forced rotation of loading motor

When STOP or EJECT appears in the display and the MD RELEASE key is pressed, it allows the loading motor to be forced to run (loading and unloading operations).

Forced movement into the loading mechanism throttle

positions

When STOP or EJECT appears in the display and the CD1 PLAY CD3 PLAY keys are pressed, the MD throttle mechanism can move to positions 1 - 3.

Adjustment of magnetic head mounting position

When the magnetic head and optical pickup have been replaced, be sure to adjust the mounting position. For easier adjustment of mounting position move the optical pickup to the center position, and then adjust the position.

1. Set the adjusting transparent disc 3.

2. Lower the magnetic head up-shift arm with your finger, and raise the magnetic head.

3. Viewing the set from above, make an adjustment so that the magnetic head aligns with the optical pickup objective lens.

4. Make sure that there is a clearance as shown in Figure 24-2 and the magnetic head moves up and down smoothly.

Mechanism Adjustment

1. Optical pickup grating inspecting method

43 Pin of IC1101

GND (TP1131)

26 Pin of IC1101

EOUT (TP1133)

25 Pin of IC1101

FOUT (TP1132)

100K

470p

100K

OSILLOSCOPE

GND CH1 CH2

LISSAJOUS'S WAVEFORM

Less than a:b = 4:1

Figure 24-3 Optical Pickup Grating Deviation

Measuring Method

Loosen the two screws(A)

MD Mechanism Switch PWB

Figure 24-1

Optical Head

Objective lens

Radial direction

Circumferential direction

Figure 24-2

Spindle Motor

Lead in Switch

Push

Optical Head

After the automatic adjustment has been performed in the AUTO mode (test mode) using the low reflection test disk MMD212 (TEAC) ("COMPLETE" will have been displayed), adjust the Lissajous waveform (x-y) using EOUT and FOUT.

1. Slightly loosen the 3 screws of spindle motor, and make an

adjustment, observing the Lissajous's waveform.

2. After the adjustments are complete, tighten the screws in numerical

order:

1 , 2 and then 3 .

Connection of extension cable

MD MAIN PWB

EXTENTION CABLE

QCNWK0122AFZZ

MD CHANGER UNIT

MD CHANGER SWITCH PWB

Figure 24-5

– 24 –

Adjusting hole

DISPLAY PWB

EXTENTION CABLE

QCNWK0123AFZZ

Spindle Motor

Adjusting hole

Figure 24-4

Figure 24-6

MAIN PWB

EEPROM WRITING PROCEDURE

MD-C2

EEPROM (IC1402) writing procedure

1. Method for setting the reference temperature value

(This setting should be performed quickly at a room temperature, between 21 C and 29 C when the PWB is not hot.)

(1) When replacing the EEPROM, wait until it has cooled down. (2) Connect the main unit using the single MD main PWB. (3) Enter the test mode as shown on page 21.

"EJECT"

(4) Press the X-BASS button.

"TEMP "

:Measured temperature, : Temperature setting

(5) Find the temperature correction value for the current ambient

temperature on the following table. Adjust the temperature correction value using the jog dial.

Ambient temperature correction

+ 21.0 °C ~ + 23.2 °C -1 H + 23.3 °C < + 26.8 °C ± 0 H + 26.9 °C < + 29.0 °C +1 H

An example: When ambient temperature is 22°C and measured

temperature is 7AH Temperature setting = 7A H - 01 H

= 79 H * When the measured temperature fluctuates between two values, take lower one (if temperature fluctuates between 7AH and 79H, take 79H).

(6) Press the POWER button and write the temperature setting into

the EEPROM.

2. Method for making settings other than the reference temperature

(1) Install the MD main PWB in the mechanism, and connect it to

the main unit.

(2) Enter the test mode as shown on page 21, and insert a disc.

"AUTO YOBI"

(3) Press the PLAY MODE button.

"EEPROM SET" (4) Selection mode using the MD1 PLAY key. (5) Selected using the SURROUND key. (6) Determined by the MD1 PLAY key. (7) Using the jog dial, adjust the settings as shown in the "List of the

EEPROM contents". (8) Press the POWER button, and the settings will be written into

the EEPROM. (9) Enter the test mode again, perform an "AUTO YOBI", and write

its results into the EEPROM.

EEPROM DATA LIST (Version : 01) Focus setting

Item indication Setting

F G D A H F F 1 7 0 H F F 2 E 0 H F Z H L E V E D H F O K L E V n 0 8 H F O K L E V f 0 8 H F O K L P F n 0 0 H F O K L P F f 8 8 H W A I T f 9 0 H

Spin setting

Item indication Setting

S P G 2 0 H S P G — i n B 8 H S P G — m i d 9 5 H S P G — o u t 7 9 H S P 1 1 0 H S P 2 8 7 H S P 3 E 3 H S P 4 E 3 H S P 5 1 0 H S P D L I M 7 F H

Tracking setting

Item indication Setting

T G 6 B H T F 1 6 B H T F 2 E 0 H S V C N T 4 0 0 H T R B L V o 5 0 H T R B L V t 5 4 H T R K L V o 5 0 H T R K L V t 2 E H T D P W o 8 9 H T D P W t 1 A H S L C T o 0 0 H S L C T t 4 0 H S L C T m 5 3 H T C R S C I P 1 6 H C O T L V P 0 A H C O T L V r 1 C H W A I T m F F H

– 25 –

MD-C2

Slide setting

Item indication Setting

S L G 3 B H S L 2 2 D H S L D L I M 7 F H S L D L E V 1 2 H S L K L V k 5 5 H S L K L V t 3 A H S L K L V m 5 5 H

ADJUST setting

Item indication

C O K A 0 H F A T C 0 H T A T 3 E H C A T 2 0 H F A B 6 4 H S T R 0 A H S F S 0 D H S T C 0 D H

Setting

Control setting

Item indication Setting

C O N T R L 1 8 0 H C O N T R L 2 0 1 H S P K L E V m 2 6 H A D J T T M 1 4 H H D E Q A D 9 2 H L D E Q A D 8 F H G D E Q A D 8 D H H D E Q B C 8 C H L D E Q B C 8 F H G D E Q B C 8 D H H A L S G 1 1 H L A L S G 1 1 H G A L S G 1 1 H H A L S O F S F C H L A L S O F S 0 0 H G A L S O F S 0 0 H

– 26 –

EXPLANATION OF ERROR DISPLAY

MD-C2

Error display

Can't REC

Can't COPY

Din UNLOCK

TOC FULL

UTOC R ERR

UTOC A ERR

UTOC L0~4 ERR

NOT AUDIO

? DISC

DISC FULL

PLAY MD

PROTECTED

Can't EDIT

TEMP OVER

MD RD ERR MD PA ERR MD WR ERR

TOC S ERR TOC R ERR TOC T ERR

UTOC W ERR

FOCUS ERR

Errors

• Defect occurred successively 10 times during REC-PLAY.

• As a result of occurrence of defect during REC-PLAY the recordable cluster became zero.

• Address is unreadable. REC state cannot be set for 20 seconds although retry is repeated.

• The following judgement is made according to the channel status of digital signal which was input from D-IN during RECPAUSE or REC-PLAY. (1) Other than audio signal (2) Other than signals of home-use appliances (3) Copy NG due to inversion of copy bit in CD.

• The digital signal which was input from CD FUNC playback caused the following. (1) PLL of digital IN was unlocked.

• There were no areas to record music or character infomation.(music name, disc name, etc.) during REC-PLAY.

• FTNO > LTNO

• FTNO ≠ 0 or 1

• UTOC recorded on disc could not be read.

• Start address > End address

• Any data of UTOC 0 to 4 looped.

• Nonaudio data was recorded in the track mode of currently selected TNO.

• Data "MINI" of system ID which has been written in TOC with ASCII code is not correct.

• The disc type written in TOC does not correspond to pre/ mastered MD, recording MD and hybrid MD.

• When an attempt to set REC-PAUSE was made, there were no recordable areas.

• An attempt to set REC-PAUSE or to start editing was made on the playback-only disc.

• An attempt to record or edit was made on the record/playback disc with its careless erase preventing tab being in erase preventing state.

• An attempt was made to edit the track which was writeprotected by information written in UTOC.

• It is indicated when a tape is faulty operation prevention condition (tabs breaks.) condition.

• Specific editing conditions were not satisfied.

• Cover the write-protect hole with a piece of cellophane tape.

• Owing to occurrence of some trouble internal temperature of set (MD unit) rose excessively.

• Read data was not correct or data could not be read correctly.

• Trouble occurred during recording if music data, resulting in record failure.

• TOC was read but data was not correct.

• TOC could not be rad.

• Trouble occurred during rewriting of UTOC, resulting in UTOC rewriting failure.

• After the disc was loaded, focusing failure occurred.

Corrective action

• Check that the disc is free from flaw, dust and fingerprint. Check whether there is any black spot. Check for disc disalignment and run-out.

• Check whether CD is copy-inhibited one. (An example: CD-R)

• Check whether there is any abnormality in the D-IN signal line.

• Replace the disc with a recording/ playback disc in which an area to register UTOC remains.

• UTOC data is not normal. Replace the disc with other disc.

• Select other TNO or replace the disc with other disc.

• The loaded disc is not applicable. Replace the disc, and check.

• Replace the disc with other recording disc in which recording area remains.

• The loaded disc is a Playback-only disc. Replace the disc with a recording disc.

• Return the careless erase preventing tab to its initial position, and redo.

• The track on which an attempt to edit was made is a write-protected track. Redo on another track.

• Cover the accidental erase prevention holes with adhesive tape.

• The applied operation procedure is not proper. Redo, applying the correct procedure.

• Check by troubleshooting.

• Check whether the ambient temperature is too high.

• Data of TOC or UTOC is not normal or disc has flaw. Replace the disc with other disc.

• The TOC information recorded on disc does not conform to the MD standard. Replace the disc with other disc.

• The disc has flaw. Replace the disc with other disc.

• Check that the disc is free from flaw, dust, fingerprint and black spot. Check for disc disalignment and run-out.

– 27 –

MD-C2

Error display

BLANK MD

TOC W ERR

MD ERR

Errors

• UTOC was read but total TNO and the number of characters of NAME was 0?

• Although UTOC can be read but UTOC cannot be rewritten.

• Data of EEPROOM is not correct.

• Perform recording to check that the disc is recordable disc.

• Check that the record head contact is normal. Check that there is no broken wire between PWB and the recording head.

• Perform adjustment

• Once reset, and redo. If error occurs persistently, replace EEPROM.

Corrective action

EXPLANATION OF MECHANISM ERROR

Error display

M E C H A _ * _ ERR None of the operations is completed properly.

HINF (IC1401 97 PIN) * = E Ejection completion position < 1.3 V * = M Horizontal midway position > 3.06 V * = L Load completed position 1.853~2.48 V * = DHead-down position 1.3~1.853 V

CD section

Error display

_ TRAY _ ERR _ • Turn the power off, and then turn the

The CD changer mechanism did not operate normality.

Errors

Corrective action

power back on. If an error display appears,check the CD changer section.

TAPE section

Error display

Can't _ REC _

Errors

No cassette tape has been loaded, or the tape in the unit cannot be re-recorded.

– 28 –

MD-C2

• Resistor:

NOTES ON SCHEMATIC DIAGRAM

To differentiate the units of resistors, such symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with “Fusible” is a fuse type.

• Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means micro-micro-farad and the unit of the capacitor without such a symbol is microfarad. As to electrolytic capacitor, the expression “capacitance/withstand voltage” is used. (CH), (TH), (RH), (UJ): Temperature compensation (ML): Mylar type (P.P.): Polypropylene type

• Schematic diagram and Wiring Side of P.W.Board for this model are subject to change for improvement without prior notice.

REF.NO. DESCRIPTION

SW1 SW2 SW3 SW4 SW1930 SW1931 SW1932 SW1933 SW1934 SW1935 SW1940 SW1941 SW1942 SW1943 SW1944 SWD01 SWD02 SWD03 SWD04 SWD05 SWD06 SWD07 SWD08 SWD09 SWD10 SWD17 SWD18 SWD19

OPEN/CLOSE MECHA UP DISC NUMBER PICKUP IN DISC ID LEAD IN PLAY REC UNLOAD CARTRIGE SLOT 1 SLOT 2 SLOT 3 LIFT A LIFT B MULTI JOG CONTROL VOLUME CD SKIP DISC 1 DISC 2 DISC 3 OPEN/CLOSE PRE-EQ X–BASS SURROUND TIME SLEEP CLOCK

POSITION

OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON

• The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chassis with no signal given.

1. In the tuner section,

( ) indicates AM < > indicates FM stereo

2. In the main section, a tape is being played back.

3. In the deck section, a tape is being played back.

( ) indicates the record state.

4. In the power section, a tape is being played back.

5. In the CD section, the CD is stopped.

• Parts marked with “ ” ( ) are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

REF.NO. DESCRIPTION

SWD20 SWD21 SWD22 SWD23 SWD24 SWD25 SWD26 SWD27 SWD28 SWD29 SWD30 SWD31 SWD32 SWD33 SWD34 SWD35 SWD37 SWD38 SWD39 SWD40 SWD41 SWD42 SWD43 SWD11 SWF02 SWK00 SWK01 SWK02

DIMMER TAPE REC MD RELESE MD REC POWER MD TUMER(BAND) TAPE MD 1 MD 2 MD 3 REW/TUNING DOWN STOP DELETE/CLEAR NAME/TOC EDIT PROGRAM CD > MD EDIT PLAY MODE DISPLAY FF/TUNING UP PLAY/PAUSE ENTER AUX CD DEMO F.P CAM CrO2

POSITION

OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON OFF-ON

– 29 –

MD-C2

TYPE OF TRANSISTOR AND LED

(FRONT VIEW)

BCE

2SB1375 2SD2012

B (D) (3)

E (S) (1)

BSH103 RNC1404 RN1406 RN2404 RNC1407 2SA1162 G 2SC2412 KR 2SK2911

TOP

VIEW

FRONT

VIEW

ECB

HE8550 D 2SC2236 Y 2SC535 C

C (G) (2)

FRONT

VIEW

(S)

(G)

(1)

(2)

HSC1815 GR KRA107 M KRA109 M KRC102 M KRC104 M KRC107 M KTC3199 GR

FRONT

VIEW

B C E

2SA1314 C

(FRONT VIEW)

FRONT

VIEW

(D)

(3)

(S)

(G)

(D)

(1)

(2)

(3)

HSA1015 GR KTA1266 GR

123

KIA7806P KIA7812P

FRONT

VIEW

321

AN78L05

FRONT

VIEW

KDV147B

KTA1270 Y KTC3203 Y HE8550 SD 2SC2389 SS 2SK246 GR

FRONT VIEW

TOP VIEW

SB0209CP

TOP VIEW

SB007-03Q

KV1236Z23F

1N4004S 1SS133

Figure 30 TYPES OF TRANSISTOR/DIODE AND LED

SLI342YCG SLI342UCE1

– 30 –

LMKD515B SLI342YCE

SLI342YCB

333GTH4

333GTH2

+ 86 hidden pages

Sharp MD-C2 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual