Sharp CDBA-125 Service manual

CD-BA120/125

SERVICE MANUAL

No. XXXXXXXXXXXXX

CD-BA120

Illustration: CD-BA120

CD-BA120 Mini Component System consisting of CD-BA120 (main unit) and CP-BA120 (speaker system).

CD-BA125

CD-BA125 Mini Component System consisting of CD-BA125 (main unit), CP-BA125 (Front speaker) and GBOXS0042AWM1 (rear spaeker).

Illustration: CD-BA125

• 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

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

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

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

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

QUICK GUIDE ................................................................................................................................................................... 6

DISASSEMBLY.................................................................................................................................................................. 7

REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 10

ADJUSTMENT ................................................................................................................................................................. 11

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 13

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 14

BLOCK DIAGRAM ........................................................................................................................................................... 15

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD..............................................................................................18

VOLTAGE ........................................................................................................................................................................ 34

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 35

FUNCTION TABLE OF IC................................................................................................................................................ 39

FL DISPLAY......................................................................................................................................................................45

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

Page

SHARP CORPORATION

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

CD-BA120/125

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

TEST PROBE

METAL PARTS

CONNECT TO KNOWN EARTH GROUND

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.

CD-BA120/125

SPECIFICATIONS

● General

Power source: AC 120 V, 60 Hz Power consumption: 35 W Dimensions: Width; 10-5/8" (270 mm)

Weight: 10.6 lbs. (4.8 kg)

Height; 11-13/16" (300 mm) Depth; 14-11/16" (373 mm)

● Amplifier section

Output power: (Except for Canada)

Output power: RMS; 20 W (10 W + 10 W) (For Canada) Output terminals: Speakers; 8 ohms (CD-BA120)

Output terminals: Front speakers; 8 ohms (CD-BA125)

10 watts minimum RMS per channel into 8 ohms from 100 Hz to 20 kHz, 10 % total harmonic distortion

(10 % T.H.D.) Headphones; 16-50 ohms

(recommended; 32 ohms) Rear speakers; 16 ohms

Headphones; 16-50 ohms (recommended; 32 ohms)

● Compact disc player section

Type: 3-disc multi-play compact Signal readout: Non-contact, 3-beam semi- D/A converter: 1-bit D/A converter

Frequency response: 20 - 20,000 Hz Dynamic range: 90 dB (1 kHz)

disc player conductor laser pickup

● Tuner section

Frequency range: FM; 87.5-108 MHz

AM; 530-1,720 kHz

● Cassette deck section

Frequency response: 50-14,000 Hz (Normal tape) Signal/noise ratio: 55 dB (TAPE 1, playback)

50 dB (TAPE 2, recording/playback)

Wow and flutter: 0.3 % (WRMS)

CP-BA120/125

● Speaker section

Type: 4" (10 cm) full-range speaker Maximum input power: 20 W Rated input power: 10 W Impedance: 8 ohms Dimensions: Width; 8-11/16" (220 mm)

Height; 11-13/16" (300 mm) Depth; 7-1/16" (180 mm)

Weight: 4.4 lbs. (2.0 kg)/each

GBOXS0042AWM1

● Rear speaker section (CD-BA125 Only)

Type: 3-3/32"(8 cm) full-range speaker Maximum input power: 5 W Rated input power: 10 W Impedance: 16 ohms Dimensions: Width; 6" (150 mm)

Height; 6" (150 mm) Depth; 3" (78 mm)

Weight: 0.9 lbs. (0.4 kg)/each

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

– 2 –

CD-BA120/125

■ Front panel

11.

(CD) Disc Tray

12.

(CD) Disc Number Indicators

13.

Timer Indicator

14.

Record Indicator

15.

Sleep Indicator

16.

Extra Bass Indicator

17.

(CD/TUNER) Memory Indicator

18.

FM Stereo Mode Indicator

19.

FM Stereo Indicator

10.

(CD) Repeat Indicator

11.

(CD/TAPE) Play Indicator

12.

(CD) Pause Indicator

NAMES OF PARTS

2

34

1

5

CD-BA120/125

6

7

8

10

1211

9

13.

(CD) Disc Skip Button

14.

(CD) Track Down/Review Button

3

(TUNER) Preset Down Button

3

(TAPE 2) Rewind Button

15.

(CD) Track Up/Cue Button

3

(TUNER) Preset Up Button

3

(TAPE 2) Fast Forward Button

16.

(CD) Open/Close Button

17.

Timer Set Indicator

18.

On/Stand-by Button

19.

Timer/Sleep Button

20.

Clock Button

21.

Function Selector Buttons

22.

Equalizer Mode Selector/Extra Bass/Demo Mode Button

23.

Volume Up/Down Buttons

24.

Headphone Socket

25.

Memory/Set Button

26.

(CD/TAPE) Stop Button

27.

(CD) Play/Repeat Button

3

(TAPE) Play Button

28.

(TAPE 2) Record Pause Button

29.

Tuning/Time Up/Down Buttons

13

14

15

17 18 19

20

21

24 25 26 27 28 29

30 31

16

22 23

30.

(TAPE 1) Cassette Compartment

31.

(TAPE 2) Cassette Compartment

– 3 –

CD-BA120/125

■ Rear panel

11. AC Power Input Socket

12. Rear Speaker Terminals (CD-BA125 Only)

13. Front Speaker Terminals

14. FM/AM Loop Aerial Socket

2 3

CP-BA120/125

■ Front speaker

11. Woofer

12. Bass Reflex Duct

13. Speaker Wire

GBOXS0042AWM1

■ Rear speaker (CD-BA125 Only)

11. Full-Range Speaker

12. Speaker Wire

CD-BA120/125

■ Remote control

11. Remote Control Transmitter LED

● CD control section

12. Disc Number Select Buttons

13. Memory Button

14. Pause Button

15. Clear Button

16. Track Down/Review Button

17. Track Up/Cue Button

18. Disc Skip Button

19. Play/Repeat Button

10. Stop Button

11. Random Button

● Tuner control section

12. Preset Up/Down Buttons

● Tape control section

13. (TAPE 1) Play Button

14. (TAPE 2) Record Pause Button

15. (TAPE 1/2) Stop Button

16. (TAPE 2) Play Button

17. (TAPE 2) Rewind Button

18. (TAPE 2) Fast Forward Button

● Common section

19. Equalizer Mode Selector Button

20. Function Selector Buttons

21. On/Stand-by Button

22. Extra Bass Button

23. Volume Up/Down Buttons

1 2

1

3 4

5 6

7

19 20

21

22

2

13

14

15

4

3

1 2

1

8 9

10

11 12

181716

23

– 4 –

OPERATION MANUAL

SETTING THE CLOCK

POWER

ON/

STAND-BY

CLOCK

MEMORY/SET

TUNING/

TIME

( )

In this example, the clock is set for the 12-hour (AM 12:00) sys-

tem.

1

Press the ON/STAND-BY button to enter the stand-by mode.

2

Press the CLOCK button.

3

Within 5 seconds, press the MEMORY/SET button.

4

Press the TUNING/TIME ( or ) button to select the time

display mode.

"AM 12:00" → The 12-hour display will appear.

(AM 12:00 - PM 11:59)

"AM 0:00 " → The 12-hou r display will appear.

(AM 0:00 - PM 11:59)

"0:00" → The 24-hour d isplay will ap pear.

(0:00 - 23:59)

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

or it has been reset (see page 15).

5

Press the MEMORY/SET button.

6

Press the TUNING/TIME ( or ) button to adjust the hour.

● Press the TUNING/TIME ( or ) button once to advance

the time by 1 hour. Hold it down to advance continuously.

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

matically to "PM".

7

Press the MEMORY/SET button.

8

Press the TUNING/TIME ( or ) button to adjust the

minutes.

● Press the TUNING/TIME ( or ) button once to advance

the time by 1 minute. Hold it down to change the time in 5

minute intervals.

● The hour setting will not advance even if minutes advance from

"59" to "00".

9

Press the MEMORY/SET button.

● The clock starts operating from "0" second.

(Seconds are not displayed.)

And then the clock display will disappear after a few seconds.

To see the time display:

Press the CLOCK button.

● The time display will appear for about 5 seconds.

Note:

● The clock display will flash on and off at the push of the CLOCK

button when the AC power supply is restored after a power

failure occurs or after the AC power cord is disconnected.

If this happens, follow the procedure below to change the clock

time.

To change the clock time:

①

Press the CLOCK button.

②

Within 5 seconds, press the MEMORY/SET button.

③

Perform steps 6 - 9 above.

To change the time display mode:

①

Perform steps 1 - 2 in the section "RESETTING THE

MICROCOMPUTER", on page 15.

②

Perform steps 1 - 9 above.

(Main unit operation)

AM 0:00AM 12:00 0:00

2

3

4

7

6

5

8

9

RESETTING THE MICROCOMPUTER

Reset the microcomputer under the following conditions:

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

settings, and tuner and CD presets).

● If the display is not correct.

● If the operation is not correct.

1

Press the ON/STAND-BY button to enter the stand-by mode.

2

While pressing down the button and the EQUALIZER/X-

BASS/DEMO button, hold down the ON/STAND-BY button for

at least 1 second.

● "CLEAR AL" will appear.

Caution:

● The operation explained above will erase all data stored in

memory including clock and timer settings, and tuner and CD

presets.

EQUALIZER

X-BASS/

DEMO

POWER

ON/

STAND-BY

CD-BA120/125

– 5 –

CD-BA120/125

MINI COMPONENT SYSTEM

Quick Guide/Guía rápida

CD-BA120

● Remote control x 1

●

Controlador remoto x 1

● 2 “AA” batteries

●

Dos pilas “AA”

Remote Sensor

Sensor remoto

2

Preparation for use /

Preparación para su uso

1

Check the supplied accessories /

Compruebe los accesorios suministrados

● FM/AM loop antenna x 1

●

Antena de cuadro de

FM/AM x 1

● Batteries are not included.

●

Las pilas no están incluidas.

8” - 20’ (0.2m - 6m)

0,2m - 6m

■ Speaker connection

■

Conexión de los altavoces

■ Antenna connection

■

Conexión de las antenas

Front speaker

(Right)

Altavoz delantero

(Derecho)

Front speaker

(Left)

Altavoz delantero

(Izquierdo)

● AM Loop Antenna

●

Antena de cuadro

de AM

● FM Antenna

●

Antena de FM

● AC 120 V, 60 Hz

●

120 V de CA, 60 Hz

Red

Rojo

■ Switching between power-on and stand-by mode

■

Cambio entre la conexión de la alimentación y el

modo de reserva

■ Remote control

■

Controlador remoto

15

Black

Negro

● AC power cord x 1

●

Cable de alimentación de

CA x 1

3

Listening to a CD /

Audición de discos CD

4

Listening to a tape /

Audición de una cinta

5

Listening to the radio /

Audición de la radio

6

Recording from CDs /

Grabaciones de discos CD

7

Sound control /

Control del sonido

● Label facing up

●

Etiqueta hacia arriba

■ To stop the playback

■

Para detener la reproducción

■ To stop the recording

■

Para detener la grabación

● Load the disc to be

recorded.

●

Introduzca el disco

que va a grabar.

● CD recording

starts.

●

La grabación de

CD empieza.

■ Volume

■

Volumen

<Pre-programmed equalizer>

Printed in Malaysia

Impreso en Malaysia

TINSZ0533AWZZ A9911.HK

FLAT

ROCK

POPS

JAZZ

CLASSIC

VOCAL

■ To stop the playback

■

Para detener la reproducción

TAPE 1 TAPE 2

TAPE 2

FLAT (X-BASS on)

ROCK (X-BASS on)

POPS (X-BASS on)

JAZZ (X-BASS on)

CLASSIC (X-BASS on)

VOCAL (X-BASS on)

VOCAL (X-BASS off)

CLASSIC (X-BASS off)

JAZZ (X-BASS off)

POPS (X-BASS off)

ROCK (X-BASS off)

FLAT (X-BASS off)

■ Extra bass (X-BASS) / Pre-programmed equalizer

■

Graves extra (X-BASS) / ecualizador preprogramado

– 6 –

Caution on Disassembly

(B1)x4 ø3x12mm

(B1)x1 ø3x10mm

Rear Panel

(B1)x1 ø3x10mm

Side Panel (Right)

Side Panel (Left)

(A1)x2 ø3x12mm

Top Cabinet

Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance:

1. Take cassette tape and compact disc out of the unit.

2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.

3. Take off nylon bands or wire holders where they need be removed when disassembling the unit. After servicing the unit, be sure to rearrange the leads where they were before disassembling.

4. Take suffcient care on static electricity of integrated circuits and other circuits when servicing.

CD-BA120/125

STEP REMOVAL

1 Top Cabinet 1. Screw ..................... (A1) x4 7-1

2 Side Panel 1. Screw ..................... (B1) x6 7-1

(Left/right)

3 CD Player Unit/ 1. Turn on the power supply, 7-2

CD Tray Cover

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

3. Hook....................... (C2) x3

4. Hook....................... (C3) x2

5. Socket .................... (C4) x2

4 Main/Headphones 1. Screw ..................... (D1) x11 7-2,8-2

PWB/Rear Panel 2. Socket .................... (D2) x4 8-2

3. Flat Cable............... (D3) x1

5 Front Panel 1. Screw ..................... (E1) x3 8-2

6 Display PWB 1. Screw .....................

7 Tape Mechanism 1. Open the cassette holder. 8-3

9 Turntable 1. Hook....................... (H1) x2 8-4

10 Disc Tray 1.

11 CD Servo PWB 1. Screw ..................... (K1) x1 8-6

(Note 2) 2. Hook ....................... (K2) x2

12 CD Mechanism 1. Hook ....................... (L1) x2 9-1

13

Loading Motor PWB

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

2. Screw...................... (G1) x6

2. Cover ..................... (H2) x1

2.

3.

3. Socket .................... (K3) x4

2. Hook....................... (L2) x3

1. Hook....................... (M1) x5 9-1

PROCEDURE

open the disc tray, take out the CD cover, and close. (Note 1)

Turn fully the lock lever in the arrow direction. While holding the lock lever,rotate the cam gear until the cam gear rib engages with the clamp lever. Push the slide holder backward to engage the claw with the groove and remove it in the direction

of the arrow. ..............

DISASSEMBLY

FIGURE

(F1) x9

(J1) x6

8-3

7-3

8-1

8-5

CD-BA120/125

CD Servo PWB

(C3) x1

Pull

Rear Panel

(C1)x1 ø3x12mm

(D1)x3 ø3x12mm

Figure 7-1

(C4)x2

Main PWB

Figure 7-2

CD-BA120/125

CD Tray Cover

(C2) x3

1

2

CD Player Unit

(C3)x1

LOCK LEVER

Note 1:

How to open the changer manually. (Fig. 7-3)

1. In this state, turn fully the lock lever in the arrow direction through the hole on the loading chassis bottom.

2.

While holding the lock lever, rotate the cam gear anticlockwise

until the cam gear rib engages with the clamp lever.

3. After that, push forward the CD slide holder.

Note 2:

1. After removing the connector for the optical pickup from the

(Fig. 8-1)

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

Figure 7-3

Note 3:

1. Be careful not to break the claw of the CD mechanism.

2. When fining back the cam gear assembly, let it lock by front movement.

– 7 –

CD-BA120/125

(K3) x2

(K2) x2

(K3) x2

CD Servo

PWB

CD Player

Base

(K1)x1 ø3x8mm

(H2) x1

CLAMP LEVER

Turntable

(D1)x1 ø3x10mm

(D2)x2

Main PWB

Figure 8-1

(D1)x7 ø3x10mm

(D3)x1

Figure 8-2

CAM GEAR RIB

(D2)x2

(E1)x3 ø3x8mm

Headphones PWB

1

(H) x2

Disc Tray

CD Player Unit

Figure 8-4

(J1) x3

2

(J1) x3

(F1)x9 ø3x10mm

Tape Mechanism

(G1)x6 ø3x10mm

(F2)x1

Figure 8-3

Figure 8-5

Display PWB

Open

Cassette Holder

Figure 8-6

– 8 –

Cam Gear

CD-BA120/125

CD Mechanism

(L1) x1

Figure 9-1

CP-BA120/125

STEP REMOVAL

1 Speaker 1. Net ..........................(A1) x1 9-1

2. Duct Panel ..............(A2) x1

3. Screw...................... (A3) x4 9-2

(L2) x3

(L1) x1

PROCEDURE

Loading Motor PWB

(M1) x5

FIGURE

CP-BA120/125

(A1)x1

(A2)x1

Driver

Speaker Box

Speaker

(A3)x4 ø3.5x13mm

Driver should be pried away from Speaker Box.

Direction of handle

Figure 9-2

Figure 9-3

– 9 –

CD-BA120/125

REMOVING AND REINSTALLING THE MAIN PARTS

TAPE MECHANISM SECTION

Perform steps 1 to 5 and 7 of the disassembly method to remove the tape mechanism.

How to remove the record/playback and erase heads (TAPE 2) (See Fig. 10-1)

1. Carefully remove the record/playback head and erase head screw (A1) x 2 pcs.

How to remove the playback head (TAPE 1) (See Fig. 10-2)

1. Carefully remove the playback head screw (B1) x 2 pcs.

How to remove the pinch roller (TAPE 1/2) (See Fig. 10-3)

1. Carefully bend the pinch roller pawl in the direction of the arrow <A>, and remove the pinch roller (C1) upwards.

Note:

When installing the pinch roller, pay attention to the spring mounting position.

Erase Head

(A1)x2 Ø2 x 9mm

Figure 10-1

TAPE2

TAPE1

Record/Playback Head

Playback Head

How to remove the belt (TAPE 1) (See Fig. 10-4)

1. Remove the main belt (D1) x 1 pc., from the motor side.

2. Remove the FF/REW belt (D2) x 1 pc.

How to remove the belt (TAPE 2) (See Fig. 10-4)

1. Remove the main belt (E1) x 1 pc., from the motor side.

2. Remove the FF/REW belt (E2) x 1 pc.

How to remove the motor (See Fig. 10-5)

1. Remove the screws (F1) x 2 pcs., to remove the motor.

Motor

TAPE2

(B1)x2 Ø2 x 9mm

Pinch Roller (C1)x1

FF/REW Belt (E2)x1

Figure 10-2

Figure 10-3

Motor

<A>

TAPE2 Main Belt (E1)x1

Motor

TAPE1 Main Belt (D1)x1

(F1) x2

Ø 2.6 x 5mm

– 10 –

Main Belt

TAPE1

FF/REW Belt (D2)x1

Figure 10-4Figure 10-5

CD MECHANISM SECTION

TAPE MECHANISM

Motor

Variable Resistor in motor

Perform steps 1, 2, 3, 9, 12 and 13 of the disassembly method to remove the CD mechanism.

CD-BA120/125

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

1. Bend the hooks (A1) x 5 pcs., to remove the loading motor.

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

1. Remove the screws (B1) x 2 pcs., to remove the shaft (B2).

2. Remove the stop washer (B3) x 1 pc., to remove the gear (B4).

3. Remove the pickup.

Note

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.

(B1) x2 ø2.6 x6mm

Loading Motor

(A1)x1

(A1)x2

CD Base

Figure 11-1

Stop Washer (B3) x1

MECHANISM SECTION

• Driving Force Check

Torque Meter

Play: TW-2111 Tape 1: Over 80 g

• Torque Check

Torque Meter

Tape 1

Play: TW-2111 30 to 80 g. cm 30 to 80 g.cm Fast forward: TW-2231 — 70 to 180 g.cm Rewind: TW-2231 — 70 to 180 g.cm

Specified Value

Tape 2: Over 80 g

Specified Value

Tape 2

Shaft (B2) x1

ADJUSTMENT

• Tape Speed

Normal MTT-111 Variable 3,000 ± Speaker speed Resistor in 30 Hz terminal

Test Tape

CD Mechanism Gear (B4) x1

Figure 11-2

Adjusting

Point

motor. (Load

Specified

Value

Instrument

Connection

Pickup

resistance: 6 ohms)

Figure 11-3

– 11 –

CD-BA120/125

IC301

R381

TP302

TP301

R357

AM IF

FM IF

FM RF

T303

T306

T302

L312

AM TRACKING fL

AM BAND COVERAGE fL

T301

T351

FM BAND COVERAGE fL

TUNER PWB

CNP301

AM LOOP

ANTENNA

1

TUNER SECTION

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

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage Frequency

Frequency

Display

AM IF 450 kHz 1,720 kHz T351 *1 AM Band — 530 kHz (fL): T306 *2

Coverage 1.1 ± 0.1 V AM Tracking 990 kHz 990 kHz (fL): T303 *1

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

Setting/

Adjusting

Parts

Instrument

Connection

• FM RF

Signal generator: 1 kHz, 22.5 kHz dev., FM modulated

Test Stage

Frequency

Display

Serring/

Adjusting

Point

FM Band — 87.50 MHz T301(fL): *1 Coverage 3.4 V ± 0.1V

FM RF 98.00 MHz 98.00 MHz L312 *2

(10-30 dB)

Instrument

Connection

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

CD SECTION

• Adjustment

Items adjusted automatically

Figure 12-1 ADJUSTMENT POINT

Since this CD system incorporates the following automatic adjustment functions, readjustment is not needed when replacing the pickup. Therefore, different PWBs and pickups can be combined freely. Each time a disc is changed, these adjustments are performed automatically. Therefore, playback of each disc can be performed under optimum conditions.

(1) Offset adjustment (The offset voltage between the head

amplifier output and the VREF reference voltage is compensated inside the IC.)

* Focus offset adjustment * Tracking offset adjustment

(2) Tracking balance adjustment (waveform drawing 12-2

EFBL)

(3) Gain adjustment (The gain is compensated inside the IC

so that the loop gain at the gain crossover frequency will be 0dB.)

* Focus gain adjustment * Tracking gain adjustment

CD ERROR CODE DESCRIPTION

Error State Code

0001 Cannot detect Pickup-in SW 0002 DSP access error

0101 Open/Close SW Low → High not functioning 0103 Open/Close SW High → Low not functioning

0201 Open/Close SW Low → High not functioning 0203 Open/Close SW High → Low not functioning

0302 Pickup-in SW is not detected 0306 During Disc 1 search, Open/Close SW or Clamp SW

0307 Clamp SW Low → High not functioning 0308 Clamp SW High → Low not functioning

– 12 –

[Servo System Error]

[Error during close operation]

[Error during open operation]

[Error during skip operation]

or Disc SW do not change to low.

T

Stopped

CH1=500mV

CH2=200mV

DC 10:1

CH3=1V

DC 10:1

=Record Length=

Main : 100K Zoom : 2k

DC 10:1

T

FDO

1

TE

3

EFBL

2

Smoothing : ON CH1 : 0.000V BW : FULL

CH2 : 0.000V CH3 : 0.00V CH4 : 0.00V

Figure 12-2

1999/04/05 20:26:47

500ms/div

(500ms/div)

NORM:20kS/s

CH2 v/DIV 200mV

=Trigger==Filter= =Offset= Mode : SINGLE Type : EDGE CH1 Delay : 0.0ns Hold off : 0.2us

NOTES ON SCHEMATIC DIAGRAM

• Resistor: 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.

CD-BA120/125

• 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 POSITION POSITION

SW1 OPEN/CLOSE ON—OFF SW2 CLAMP ON—OFF SW3 DISC NUMBER ON—OFF SW4 PICKUP IN ON—OFF SW701 POWER ON—OFF SW702 CLOCK ON—OFF SW703 TIMER/SLEEP ON—OFF SW709 DISC SKIP ON—OFF SW710 OPEN/CLOSE ON—OFF SW711 X-BASS/DEMO/EQUALIZER ON—OFF SW712 VOLUME UP ON—OFF SW713 VOLUME DOWN ON—OFF

REF. NO DESCRIPTION

SW714 CD ON—OFF SW715 TAPE ON—OFF SW716 TUNING /TIME DOWN ON—OFF SW717 MEMORY/SET ON—OFF SW718 REWIND ON—OFF SW719 FAST FORWARD ON—OFF SW720 PLAY/REPEAT ON—OFF SW721 STOP ON—OFF SW723 REC/PAUSE ON—OFF SW725 TUNING/TIME UP ON—OFF SW725 TUNER (BAND) ON—OFF

FRONT

VIEW

FRONT

FRONT VIEW

VIEW

E C B

(S) (G) (D)

(1) (2) (3)

KTA1266 GR KRC102 M KRC104 M KTA1271 Y 2SC1845 F

KTA1273 Y KTC3203 Y KRC107 M KTC3194 Y 2SC3331

BCE

KTC2026

Figure 13 TYPES OF TRANSISTOR AND LED

– 13 –

4204SRT7

CD-BA120/125

1

3

5

4

3

1

2

4

IC2 24

IC2 23

IC2 24

IC2 72

IC1 18 , IC2 16

IC1 27

IC1 18 , IC2 16

IC2 72

IC2 24

Stopped

CH1=500mV

DC 10:1

T

FDO

1

TDO

3

Smoothing : ON CH1 : 0.000V BW : FULL

1

T

2

3

Smoothing : ON CH1 : 0.000V BW : FULL

2

T

1

Smoothing : ON CH1 : 0.0V BW : FULL

T

2

CH2 : 0.0V CH3 : 0.000V CH4 : 0.00V

Stopped

CH1=500mV

DC 10:1

FDO

DRF

TE

-3div -1div 0div +1div +3div

Stopped

CH Position To

CH2 : 0.0V CH3 : 0.00V CH4 : 0.00V

CH1=10V

DC 10:1

TE

DRF

=Filter= =Offset=

CH2 : 0.00V CH3 : 0.00V CH4 : 0.00V

CH1=200mV

DC 10:1

FDO

CH2=10V

DC 10:1

T

CH2=1V

DC 10:1

T

CH2=500mV

DC 10:1

CH3=500mV

DC 10:1

=Record Length=

Main : 100K Zoom : 2K

CH3=1V

DC 10:1

=Record Length=

Main : 100K Zoom : 2K

=Record Length=

Main : 100K Zoom : 2K

WAVEFORMS OF CD CIRCUIT

500ms/div

(500ms/div)

NORM:20kS/s

IC2 1

7

IC2 2

8

IC2 24

10

11

12

1

9

1

4

13

IC2 37

IC2 57

IC2 58

IC2 59

IC2 24

IC1 18 , IC2 16

IC1 13 , IC2 22

CH1 v/DIV 500mV

=Trigger==Filter= =Offset= Mode : AUTO Type : EDGE CH1 Delay : 0.0ns Hold off : 0.2us

500ms/div

(500ms/div)

NORM:20kS/s

CH2 Position

0.20div

=Trigger==Filter= =Offset= Mode : AUTO Type : EDGE CH1 Delay : 0.0ns Hold off : 0.2us

Vp-p=1.0V~1.3V

0.5mV/div,0.5µsec/div

100ms/div (100ms/div)

NORM:100kS/s

=Trigger= Mode : NORMAL Type : EDGE CH1 Delay : 2.924ms Hold off : 0.2us

1999/04/07 09:51:15

500ms/div

(500ms/div)

NORM:20kS/s

Stopped

3

4

T

1

Smoothing : ON CH1 : 0.000V BW : FULL

Stopped

T

1

DOUT

=Filter= =Offset= Smoothing : ON CH1 : 0.00V BW : FULL

Stopped

1

LRSY

2

DATACK

T

3

DATA

Smoothing : ON CH1 : 0.00V BW : FULL

Stopped

T

FDO

1

TE

3

EFBL

2

Smoothing : ON CH1 : 0.000V BW : FULL

CH1=500mV

DC 10:1

PDO1

PDO2

FDO

CH1=2V

DC 10:1

CH1=2V

DC 10:1

CH1=500mV

DC 10:1

CH2 : 0.0V CH3 : 0.00V CH4 : 0.00V

T

CH2 : 0.00V CH3 : 0.00V CH4 : 0.00V

T

CH2=2V

DC 10:1

CH2 : 0.00V CH3 : 0.00V CH4 : 0.00V

T

CH2=200mV

DC 10:1

CH2 : 0.000V CH3 : 0.00V CH4 : 0.00V

CH3=1V

DC 10:1

=Record Length=

Main : 100K Zoom : 2K

=Record Length=

Main : 1K Zoom : 100

CH3=2V

DC 10:1

=Record Length=

Main : 5K Zoom : 100

CH3=1V

DC 10:1

=Record Length=

Main : 100K Zoom : 2k

1999/04/05 17:33:17

CH4=1V

500ms/div

(500ms/div)

DC 10:1

NORM:20kS/s

=Trigger==Filter= =Offset= Mode : AUTO Type : EDGE CH2 Delay : 0.0ns Hold off : 0.2us

1999/04/07 09:25:28

500ns/div

(500ns/div)

NORM:200MS/s

=Trigger= Mode : NORMAL Type : EDGE CH1 Delay : 2.887ms Hold off : 0.2us

1999/04/05 20:50:17

NORM:100kS/s

=Trigger==Filter= =Offset= Mode : AUTO Type : EDGE CH3 Delay : 0.0ns Hold off : 0.2us

1999/04/05 20:26:47

500ms/div

(500ms/div)

NORM:20kS/s

=Trigger==Filter= =Offset= Mode : SINGLE Type : EDGE CH1 Delay : 0.0ns Hold off : 0.2us

5us/div

(5us/div)

CH1 v/DIV 500mV

CH3 v/DIV 2 V

CH2 v/DIV 200mV

SPDO

IC2 25

6

1

=Filter= =Offset= Smoothing : ON CH1 : 0.000V BW : FULL

CH2 : 0.000V CH3 : 0.00V CH4 : 0.00V

=Record Length=

Main : 100K Zoom : 2K

=Trigger= Mode : NORMAL Type : EDGE CH2 Delay : 2.924ms Hold off : 0.2us

– 14 –

CNP12

CNP11

Q2

+3.3V

+5V

CONT5

CONT2

CONT3

CONT4

CONT7

CONT6

SLD0

SPD0

FD0 TD0

+5V

TO DISPLAY SECTION

CLAMP SW

CDINT

WRQ

CE

DO

CLK

DI

CD RES

GND

DRF

CNS4

BI4

CNP4

M2

SLED

MOTOR

M1

SPINDLE

MOTOR

M

TRACKING COIL

FOCUS COIL

PICKUP UNIT

TE

FE

RFEV

HFL

VVDD

ADAVDD

VDD

LVDD

RVDD

XVDD

VDD5V

RFEV

FE-

FE

TE-

TE

HFL

+3.3V

CONSTANT

VOLTAGR

+5V

Q1

Q3

LASER

DRIVER

LDD

PD

VCC3

VCC2

VCC4

VCC1

TIN2

TIN1

FIN2

FIN1

IC3

M63001FP

FOCUS/TRACKING/

SPIN/SLIDE DRIVER

IC1

LA9235M

SERVO AMP.

TO MAIN SECTION

(TO IC601)

R-CH

L-CH

AGND

DGND

+5V(+B3)

RCHO

RVSS

LVSS

LCHO

IC2

LC78641E

SERVO/SIGNAL

CONTROL

-

+

M

SW1

OPEN/

CLOSE

XL1

16.9344MHz

6

5

43

3

2

5

4

1

12

34

7

8

217

89

10

12

4

3

5

SW2

CLAMP

SW3

DISC

NUMBER

M3

T/T

UP/DOWN

MOTOR

6

12

4

3

56

12

4

3

56

75

76

45 46

47 48 32 31

30 65 66 67 68 69 70 71 72

CE CL

DI

DO

INT

WRQ

RES

DEF

52

51

XOUT

XIN

735183644 49 50 7 14 15 16

23

24

25

26

33

3

13

19

40

64

74

17

18 19 20

21

22

30

23 11

9

1

45671516 26 27

2 1725 4142 3839

35

29 22 21 14

8

40

18

24 23 28

SW4

PICKUP IN

+3.3V

CD-BA120/125

Figure 15 BLOCK DIAGRAM (1/3)

– 15 –

CD-BA120/125

AM

PB HEAD

TAPE 1

REC PB HEAD

TAPE 2

FM

CNP301

CD SECTION

L-CH

R-CH

L-CH R-CH

1 2 3

TAPE MOTOR

SOLENOID

T2 PLAY T1 PLAY R. PLAY F. PLAY

FROM

CNP11

REC

P.B.

AC BIAS

BF301

AM TRACKING

T303

M

SWITCHING

Q104~ Q107

IC301

TA7358AP

1

FM FRONT END

4

3

L312

5

2

FM RF

T306

MOTOR DRIVER

Q708

+3B

Q704

+3B

Q705 IC701

54PIN IC701

53PIN IC701

56PIN IC701

55PIN

CNS402

1 2 3

PLAYBACK AND RECORD

4

5

L(T1) R(T1)

L(T2) R(T2)

L NF

R NF

POP REDUCE

L REC R REC

REF

IC101

AN7345K

/PLAYBACK AMP.

1

24

2

23

3

22

T1/T2

6

REC

9

16 14

NOR/

12

HIGH

15

SWITCHING

Q108 Q109

SWITCHING

Q103

8

7

FM

OSC

T301

OSC BUFF

Q302

AM BAND

COVERAGE

P.B

H/N

T1/T2

19

+B4

FM IF

6

T302

9

FM

+B

SWITCHING

+B2

13

L

4

PB

R

21

FM OSC

VT

Q360

CF303

20

FM

1

FM/AM IF MPX.

23

AM OSC IN

X352

4.5MHZ

14

OSC

PLL(TUNER)

2

AM MIX

IC303

LA1832S

21

AM RF IN

22

IC302

LC72131

7

TAPE

TUNER

CD

T351

AM IF

1615

FM/AM

CF351

CF352

4

985

GND

VCC

DET

FM/AM

MPXIN

OUT

16

18

7

STEREO

CL

DI

CE

4

5

3

MO/ST

21

10

IC601

LC75341

AUDIO PROCESSOR

8

7

17

18

9

L R L R L

R

AM IF

11

10 15 11 14 12 13

X351

456KHz

13

17

MO/ST

FM

VCO

L

14

R

15

FM/AM

12

DO

6

17

+B2

23

DI

1

CE

2

CL

24 21

R L

4

Q601 Q602

SYSTEM MUTE

3

Q110 Q111

MUTING

REC/PLAY

5

20

L REC

7

R

18

L NF

8

R NF

17

ALC

10

T1/T2

ERASE

HEAD

BIAS OSC

Q114 L104

Q101

SWITCHING

Q102

SWITCHING

Q112 L103

BIAS

Q113

Figure 16 BLOCK DIAGRAM (2/3)

– 16 –

BIAS

CD-BA120/125

Q601 Q602

+B4

SYSTEM MUTE

~

2

1

3

10

SP. DET.

Q901 Q902

L

R

IC901

LA4282

POWER AMP.

FL701

FL DISPLAY

31

~

11

~

13

14

191615

2220

17

30

2118

27

3332

Q701

+B4

49

48

5056

IC701

SYSTEM

RESET

1112139 10 15 16 17

100

79 92

99 80

78

71

91

~

+B4

59 58

57 55 54 53

VLOAD

VDD

4 1

52 51

IX0336AW

MICROCOMPUTER

~

6 5

7

XL701

Q707

2 5

11

7

R-OUT

L-OUT

47

+B4

46

VDD

3

44 43 42

45

SYS. STOP

CEDICL

~

20

21 22

RESET IC

IC704

1

2

+B4

44

AVDD

23

40

39 38 37 36 35

+B4

34 33

~

31

DO

24

KEY SW701~SW703 SW709~SW721 SW723~SW725

+B2

JK901

HEADPHONES

TO CD SECTION

SO901

SPEAKER TERMINAL

(FRONT)

+Vcc

10

(REAR)

F901

+B1

3A/250V

CD-BA125 ONLY

REC/PLAY

T1/T2

BIAS

+B2

+B3

UNSWITCH

+B4

A10V

+5V

5V

Q903

IC902

IC904

D907~D910

D911~D914

Q904

AC POWER

SUPPLY CORD

F902

1.6A/250V

AC 120V 60Hz

TF

PT801

POWER TRANSFORMER

Figure 17 BLOCK DIAGRAM (3/3)

– 17 –

CD-BA120/125

H

7

R

1

A

Vcc

7

Vref

6

B

6

E

5

A

4

B

3

F

2

C

1

C

D

CD SERVO PWB-B

CNS1A

CNS1B

7

6

R51 68K

5

R52 68K

4

R53 68K

3

R54 68K

2

1

CNP1

R56

68K

+B

C53

47/10

0.001

Q3

KTA1266GR LASER DRIVER

0.1

C41

100/10

C23

0.047

C24

2.2/50

C22 100P

R15 10K

R43

220K

8

R12 680

R79

1.5M

C21

0.1

R11 12K

R80

1M

C2

0.1

C26

0.047

P

C28

47/10

2

EFBL

+B

R50

47

TIN1 FIN1 FIN2 TIN2

R55

68K

FIN1

1

REF

FIN2

2

REF

TIN1

C55

C54

0.01

47/10

C7 10/16

C8

0.1

C51

+B

R25 10K

R47

3.3

TIN2

C6 100/10

REF1 VREF

LDD GND LDON

AGON EFBL

TEST0 TES1

3

REF

4

REF

5 6 7 8

9 10 11 12 13 14 15

REF

APC

ODRV AGCON

IC1

LA9235M

SERVO AMP.

REF

LPF

REF

REF REF

ODRV

REF

AGCON

PH/BH

C11

0.47/6.3

VCC

30

ODRV

REF

PH

DH

REF LPF

REF

LPF

REF

C12

0.1

RFSW

29

R42

C18

R7

120K

RF-

28

RF

27

NC

26

PH

25

BH

24 23

RFEV

22

FE-

21

FE

20

TE-

19

TE

18

HFL

17 16

TEST

100K

10K

3P

6.8K (CH)

R6

R5

27K

39K

5

C13

0.01

C14

0.33

R3

R4

4

C17

0.0047

DS1SS133

C25

C19

100/10

R10

27K

C20

0.1 R8

330

C42 68P

C82

0.022

D93

E

TR+ FO+

FO-

F

TR-

ACTUATOR

PICKUP UNIT

G

CD MOTOR PWB-C

M1

SPINDLE

MOTOR

M2

SLED

MOTOR

SW4

PICKUP IN

H

13

TDO

C52

0.01

+B

TDO

C50

100/16

FDO

0.022

C46

GND

SLDO VCC1

STANDBY

MUTE

C49

TO FD

FO

FO+ FOTR+

TR-

SL-

SL+

Vref

TRTR+

FO+ FOGND

+

M

+

M

-

CNP3A

1

2

3

4

5

6

PD

7

VR LD

CNS2B

CNS3B

6

5

4

3

2

1

1 2 3 4 5 6 7 88

CNS2A

CNS3A

6 5 4 3 22 1

TR-

1

TR+

2

FO+

3

FO-

4

GND

5

PD

6

VR

7

LD

88

CNP2

+B

R48

6.8K

SP-

6

SP+

5

SL+

4

SL-

3

PUIN

2

GND(D)

1

CNP3

+B

100/16

-

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17

18 19 20 21

-

+

-

+

-

+

IC3

M63001FP

FOCUS/TRACKING/

-

+

-

SPIN/SLED DRIVER

+B

+

-

+

-

LD_M+

42

+

LD_M-

-

41

VCC4

+

40

-

LOADING M+

39

LOADING M-

38 37 36 35 34 33

GND

32 31 30 29

VCC3

28

SP-

27

SP+

26

SPO

-

25

+

VCC2(SPN)

+

24

-

23

+

-

22

SPDO

C47

100/16

+B

• NOTES ON SCHEMATIC DIAGRAM can be found on page 13.

1

23456

Figure 18 SCHEMATIC DIAGRAM (1/10)

– 18 –