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

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

<Extra bass (X-BASS)>

<Graves extra (X-BASS)>

<Pre-programmed equalizer>

<Ecualizador preprogramado>

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

(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

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 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

(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

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

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

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

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

+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

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

7

Vref

6

B

6

E

5

5

A

4

4

B

3

3

F

2

2

C

1

1

C

D

CD SERVO PWB-B

CNS1A

CNS1B

7

7

6

6

R51 68K

5

5

R52 68K

4

4

R53 68K

3

3

R54 68K

2

2

1

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

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

1

2

2

3

3

4

4

5

5

6

6

PD

7

7

VR
LD

CNS2B

CNS3B

6

6

5

5

4

4

3

3

2

1

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

+B

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

1

23456

Figure 18 SCHEMATIC DIAGRAM (1/10)

– 18 –