Sharp CDBA-250 Service manual

CD-BA250/CD-BA2600

SERVICE MANUAL

No. S1105CDBA250/

MINI COMPONENT SYSTEM

MODEL CD-BA250

CD-BA250 Mini Component System consisting of
CD-BA250 (main unit) and CP-BA250 (speaker system).

MINI COMPONENT SYSTEM

MODEL CD-BA2600

CD-BA2600 Mini Component System consisting of
CD-BA2600 (main unit) and CP-BA2600 (speaker system).

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

CONTENTS

Page

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

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

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

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

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

REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 12

ADJUSTMENT ................................................................................................................................................................. 13

BLOCK DIAGRAM ........................................................................................................................................................... 17

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD..............................................................................................20

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

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 37

TYPES OF TRANSISTOR AND LED................................................................................................................................37

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 38

TROUBLESHOOTING ..................................................................................................................................................... 39

FUNCTION TABLE OF IC................................................................................................................................................ 43

FL DISPLAY......................................................................................................................................................................49

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

SHARP CORPORATION

– 1 –

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

CD-BA250/CD-BA2600

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-BA250/CD-BA2600

General

Power source
Power consumption
Dimensions

Weight

Amplifier

Output power

Output terminals

Input terminals

CD player

Type
Signal readout
D/A converter
Frequency response
Dynamic range

SPECIFICATIONS

AC 120 V, 60 Hz
128 W
Width: 10-5/8" (270 mm)

Height: 13" (330 mm)
Depth: 13-7/16" (340 mm)

13.8 lbs. (6.3 kg)

75 watts minimum RMS per channel into 6 ohms from
60 Hz to 20 kHz, 10% total harmonic distortion

Speakers: 6 ohms
Headphones: 16 - 50 ohms (recommended: 32 ohms)
Video/Auxiliary (audio signal): 500 mV/47 kohms

3-disc multi-play compact disc player
Non-contact, 3-beam semiconductor laser pickup
1-bit D/A converter
20 - 20,000 Hz
90 dB (1 kHz)

Tuner

Frequency range

Cassette deck

Frequency response
Signal/noise ratio

Wow and flutter

CP-BA250/CP-BA2600

Type

Maximum input power
Rated input power
Impedance
Dimensions

Weight

FM: 87.5 - 108 MHz
AM: 530 - 1,720 kHz

50 - 14,000 Hz (Normal tape)
55 dB (TAPE 1, playback)

50 dB (TAPE 2, recording/playback)

0.3 % (WRMS)

2-way type speaker system
2" (5 cm) Tweeter
5-1/4" (13 cm) Woofer
150 W
75 W
6 ohms
Width: 8-11/16" (220 mm)

Height: 13" (330 mm)
Depth: 8-9/16" (217 mm)

6.6 lbs. (3.0 kg)/each

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

– 2 –

CD-BA250/CD-BA2600

Front panel

1. Disc Tray

2. Timer Set Indicator

3. Power On/Stand-by Button

4. Tape 2 Cassette Compartment

5. Tape 1 Cassette Compartment

6. Equalizer Mode Select Button

7. Volume Up or Down Buttons

8. Extra Bass/Demo Mode Button

9. Disc Tray Open/Close Button

10. Disc Skip Button

11. Tuning and Time Up Button

12. CD or Tape Stop Button

13. CD Button

14. Tuner (Band) Button

15. Tape (1 2) Button

16. Video/Auxiliary Button

17. Dimmer Button

18. Clock Button

19. Timer/Sleep Button

20. Headphone Jack

21. CD Play or Repeat, Tape Play Button

22. CD Track Up or Fast Forward, Tape 2
Fast Forward, Tuner Preset Up Button

23. Tuning and Time Down Button

24. Memory/Set Button

25. Tape 2 Record Pause Button

26.CD Track Down or Fast Reverse, Tape 2
Rewind, Tuner Preset Down Button

NAMES OF PARTS

1
2

3

CD-BA250/CD-BA2600

67

8

161514131211

9
10

4
5

Display

1. Extra Bass Indicator

2. FM Stereo Mode Indicator

3. FM Stereo Receiving Indicator

4. CD Repeat Play Indicator

5. CD Pause Indicator

6. CD Play Indicator

7. Disc Number Indicators

8. Timer Play Indicator

9. Timer Recording Indicator

10. Tape 2 Record Indicator

11. Memory Indicator

12. Tape Play Indicator

13. Sleep Indicator

14. Spectrum Analyzer/Volume Level Indicator

17
18

19
20

23 24 25 26

1
2

345 10

21
22

7
8

9

1112 136

14

– 3 –

14 14

CD-BA250/CD-BA2600

CD-BA250/CD-BA2600

Rear panel

1. FM/AM Loop Antenna Jack

2. Video/Auxiliary (Audio Signal) Input Jacks

3. Speaker Terminals

4. AC Power Cord

1
2

3

4

Remote control

1. Remote Control Transmitter

2. Disc Number Select Buttons

3. CD Pause Button

4. CD Memory Button

5. CD Track Down or Fast Reverse Button

6. CD Clear Button

7. Tape 1 Play Button

8. Tape 1/Tape 2 Stop Button

9. Equalizer Mode Select Button

10. Tape 2 Record Pause Button

11. CD Button

12. Tuner (Band) Button

13. Power On/Stand-by Button

14. Extra Bass Button

15. CD Stop Button

16. CD Play or Repeat Button

17. CD Track Up or Fast Forward Button

18. CD Random Button

19. Tuner Preset Up/Down Buttons

20. Tape 2 Play Button

21. Tape 2 Rewind Button

22. Tape 2 Fast Forward Button

23. Video/Auxiliary Button

24. Tape (1

25. Volume Up or Down Buttons

2) Button

✱
✱

✱

1

2

3
4

5
6

7

8
9

10
11
12

13

15
16

17
18
19
20

21
22

23
24

25

✱

14

Buttons with " " mark in the illustration can be operated on the remote control

only.

Other buttons can be operated both on the main unit and the remote control.

– 4 –

CP-BA250/CP-BA2600

Speaker system

1. Tweeter

2. Woofer

3. Bass Reflex Duct

4. Speaker Wire

CD-BA250/CD-BA2600

1

2

Setting the Clock

3

OPERATION MANUAL

4

Press the TUNING/TIME ( or )button to adjust the hour and then
press the MEMORY/SET button.

Press the TUNING/TIME ( or ) button once to advance the time by 1 hour.
Holdit down to advance continuously.

When the 12-hour display is selected, "AM" will change automatically to "PM".

5

Press the TUNING/TIME ( or ) button to adjust the minutes and
then press the MEMORY/SET button.

3

4

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

1

Press the ON/STAND-BY button to turn the power on.

2

Press the CLOCK button and within 5 seconds, press the MEMO­RY/SET button.

3

Press the TUNING/TIME ( or ) button to select 12-hour or 24­hour display and then press the MEMORY/SET button.

"AM 12:00" The 12-hour display will appear.
(AM 12:00 - PM 11:59)
"AM 0:00" The 12-hour display will appear.
(AM 0:00 - PM 11:59)
"0:00" The 24-hour display will appear.
(0:00 - 23:59)
Note that this can only be set when the unit is first installed or it has been reset.

(Refer to step 3 under "If trouble occurs".)

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 will not advance even if minutes advance from "59" to "00".
The clock begins counting from "0" seconds. (Seconds are not displayed.)

The time display will disappear after a few seconds.

To confirm the time display:

Press the CLOCK button.
The time display will appear for about 5 seconds.

Note:

The "CLOCK" or time will flash at the push of the CLOCK button when the AC power
supply is restored after a power failure or unplugging the unit.
Readjust the clock as follows.

To readjust the clock:

Perform "Setting the Clock" from the beginning. If the time display is flashing, step 3
(for selecting the 12-hour or 24-hour display) will be skipped.

To change the 12-hour or 24-hour display:

1 Clear all theprogrammed contents. [Perform to step 3 under "If trouble occurs"]
2 Perform "Setting the Clock" from the beginning.

– 5 –

CD-BA250/CD-BA2600

Troubleshooting Chart

Many potential "problems" can be resolved by the owner without calling a service
technician.
If something is wrong with this product, check the following before calling your autho­rized SHARP dealer or service center.

General

Symptom Possible cause

The clock is not on time. Did a power failure occur? Reset the clock.
When a button is pressed, the unit

does not respond.

No sound is heard. Is the volume level set to "0"?

Set this unit to the power stand-by mode and
then turn it back on.

If the unit still malfunctions, reset it. (Refer to
step 3 under "If trouble occurs")

Are the headphones connected?
Are the speaker wires disconnected?

CD player

Symptom Possible cause

Playback does not start. Is the disc loaded upside-down?
Playback stops in the middle or is not

performed properly.

Playback sounds are skipped, or
stopped in the middle of a track.

Does the disc satisfy the standards?
Is the disc distorted or scratched?
Is the unit located near excessive vibrations?
Is the disc very dirty?
Has condensation formed inside the unit?

Tuner

Symptom Possible cause

Radio makes unusual noise con­secutively.

Is the unit placed near the TV or computer?
Is the FM/AM loop antenna placed properly?

Move the AC power cord away from the an­tenna if located near.

Cassette deck

Symptom Possible cause

Cannot record. Is the erase-protection tab removed?
Cannot record tracks with proper

sound quality.
Cannot erase completely.
Sound skipping. Is there any slack?

Cannot hear treble. Are the capstans, pinch rollers, or heads
Sound fluctuation.
Cannot remove the tape. If a power failure occurs during playback, the

Is it a normal tape? (You cannot record on a
metal or CrO tape.)

Is the tape stretched?

dirty?

heads remain engaged with the tape. Do not
open the compartment forcibly. Wait until
electricity resumes.

Remote control

Symptom Possible cause

The remote control does not oper­ate.

Is the AC power cord of the unit plugged in?
Is the battery polarity respected?
Are the batteries dead?
Is the distance or angle incorrect?
Does the remote control sensor receive

strong light?

Condensation

Sudden temperature changes, storage or operation
in an extremely humid environment may cause con­densation inside the cabinet (CD pickup, tape
heads, etc.) or on the transmitter on the remote con­trol.
Condensation can cause the unit to malfunction. If
this happens, leave the power on with no disc (or
cassette) in the unit until normal playback is possible
(about 1 hour). Wipe off any condensation on the
transmitter with a soft cloth before operating the unit.

Troubleshooting Chart

If trouble occurs

When this product is subjected to strong external interference (mechanical shock,
excessive static electricity, abnormal supply voltage due to lightning, etc.) or if it is
operated incorrectly, it may malfunction.

If such a problem occurs, do the following:
1 Set the unit to the stand-by mode and turn the power on again.

2 If the unit is not restored in step 1, unplug and plug in the unit, and then turn

the power on.

3 If neither step 1 nor 2 restores the unit, do the following:

Press the ON/STAND-BY button to enter the power stand-by mode.
While pressing down the / button and the X-BASS/DEMO button, press
the ON/STAND-BY button until "CLEAR AL" appears.

Caution:

This operation will erase all data stored in memory including clock, timer settings,
tuner preset, and CD program.

Before transporting the unit

1 Press the ON/STAND-BY button to turn the power on.
2 Press the CD button.
3 Press the OPEN/CLOSE button to open the disc tray.

Remove all CDs inserted in the unit.

4 Press the OPEN/CLOSE button to close the disc tray.

Make sure that "NO DISC" is displayed.

5 Press the ON/STAND-BY button to enter the stand-by mode, and then

unplug the AC power cord from the AC outlet.

Remote Control

Test of the remote control

Face the remote control directly to the remote sensor on the unit.

The remote control can be used within the range shown below:

Press the ON/STAND-BY button. Does the power turn on? Now, you can enjoy the
music.

Remote sensor

8" - 20'
(0.2 m - 6 m)

– 6 –

CD-BA250/CD-BA2600

Accessories

Accesorios

FM/AM loop antenna × 1

Antena de cuadro de FM/AM

×

1

Remote control × 1

Controlador remoto

×

1

1

1

1

2

3

Battery Installation of the Remote Control

Instalación de las pilas del controlador remoto

Use 2 “AA” size batteries (UM/SUM-3, R6, HP-7 or similar). Batteries are not included.

Use dos pilas del tamaño “AA” (UM/SUM-3, R6, HP-7 o equivalentes). Las pilas no están incluidas.

Remove the

Insert the batteries

Replace the cover.

battery cover.

as shown.

Extraiga la cubierta Inserte las pilas Vuelva a colocar la

de las pilas. como se muestra. cubierta.

1

2

System Connections

Conexiones del sistema

3

3

AM loop antenna

Antena de cuadro de AM

FM antenna

Antena de FM

Red

Rojo

Black

Negro

Right speaker

Altavoz derecho

Left speaker

Altavoz izquierdo

AC outlet

(AC 120 V, 60 Hz)

A un tomacorriente de

CA (120 V de CA, 60 Hz)

Right speaker

Altavoz derecho

Left speaker

Altavoz izquierdo

RCA cord

(not supplied)

Cable RCA

(no suministrado)

To the line

output jack

A la toma de

salida de línea

VCR

Videograbadora

TV

TV

– 7 –

CD-BA250/CD-BA2600

Turning on Your System

Conexión de la alimentación de su sistema

4

4

The first time the unit is plugged,

the unit will enter the demonstra-

tion mode. You will see words

scroll.

Cuando se enchufe por primera vez

el aparato, se establecerá en el

modo de demostración. Verá un

desplazamiento de palabras.

1

2

Press the

X-BASS/DEMO

button to cancel

the demonstration

mode.

Pulse el botón

X-BASS/DEMO para

cancelar el modo de

demostración.

Press the ON/

STAND-BY button to

turn the power on.

Pulse el botón ON/

STAND-BY

para

conectar la

alimentación.

Listening to a CD (CDs)

Audición de un disco CD (discos CD)

1

Press the CD button.

Pulse el botón CD.

2

Press the OPEN/CLOSE button to

open the disc tray.

Pulse el botón OPEN/CLOSE para abrir

la bandeja de discos.

3

Place the CD(s) on the disc tray, label

side up.

When loading a third disc, press the

DISC SKIP button to turn the disc tray,

then place the CD in the open position.

Coloque el disco compacto en la bandeja

de discos, con el lado de la etiqueta hacia

arriba.

Cuando ponga un tercer disco, pulse el

botón DISC SKIP para girar la bandeja de

discos, y coloque el disco compacto en la

posición abierta.

4

Press the OPEN/CLOSE button to

close the disc tray.

Pulse el botón OPEN/CLOSE para cerrar

la bandeja de discos.

5

To select the CD you want to listen to

first, press one of 1 - 3 buttons on

the remote control.

Para seleccionar el disco CD que desee

escuchar primero, pulse uno de los botones

1 - 3 del controlador remoto.

6

Press the button to start playback.

Pulse el botón para iniciar la

reproducción.

5” (12 cm)

12 cm

3” (8 cm)

8 cm

Listening to a Cassette Tape (TAPE 1 or TAPE 2)

Audición de una cinta de cassette (TAPE 1 o TAPE 2)

Listening to the Radio

Audición de la radio

FM stereo mode indicator

Indicador del modo de FM en estéreo

FM stereo receiving indicator

Indicador de recepción de FM en estéreo

1

Open the cassette door by pushing the

area marked “ PUSH EJECT”.

Abra la puerta del cassette pulsando la

parte marcada “ PUSH EJECT”.

2

Load a cassette into the TAPE 1 or T APE

2 cassette compartment with the side to

be played facing toward you.

Cargue un cassette en el compartimiento

de cassette de TAPE 1 o de T APE 2 con la

cara a reproducirse encarada hacia usted.

3

Press the TAPE (1 2) button to select

the cassette you want to listen to.

Pulse el botón TAPE (1 2) para

seleccìonar el cassette que desee

escuchar.

4

Press the button to start playback.

Pulse el botón para iniciar la

reproducción.

1

Press the TUNER (BAND) button repeat-

edly to select the desired frequency

band (FM or AM).

Pulse repetidamente el botón TUNER

(BAND) para seleccionar la banda de

frecuencia deseada (FM o AM).

2

Press the TUNING/TIME ( or ) but-

ton to tune in to the desired station.

When the TUNING/TIME button is

pressed for more than 0.5 seconds, scan-

ning will start automatically and the tuner

will stop at the first receivable broadcast

station.

Pulse el botón TUNING/TIME ( o ) para

sintonizar la emisora deseada.

Cuando se pulse el botón

TUNING/TIME

durante más de 0,5 segundos, la

exploración se iniciará automáticamente y

el sintonizador se parará en la primera

emisora difusora que pueda recibirse.

To receive an FM stereo transmission:

Press the TUNER (BAND) button to display the

“ST” indicator.

● “ ” will appear when an FM broadcast is in ste-

reo.

Para recibir una transmisión de FM en estéreo:

Pulse el botón TUNER (BAND) para que se encienda

el indicador “ST”.

●

“ ” aparecerá cuando una difusión de FM sea en

estéreo.

TAPE 1

TAPE 2

– 8 –

(B1)x4
ø3x10mm

(B1)x2
ø3x10mm

Rear
Panel

(B1)x2
ø3x10mm

Side Panel
(Right)

Side Panel
(Left)

(A1)x2
ø3x12mm

(A1)x2
ø3x12mm

Top Cabinet

(E1)x1
ø3x10mm

(C3)x1

(D1)x2
ø3x10mm

(D2)x1

CD Player
Unit

CD Tray Cover

Pull

(C3) x1

(C4)x2

(C2) x3

1

1

2

CD Servo
PWB

(C1)x1
ø3x10mm

(D1)x7
ø3x10mm

Rear
Panel

Main PWB

Lug Wire

DISASSEMBLY

Caution on Disassembly

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 to
be removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were
before disassembling.

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

CD-BA250/CD-BA2600

STEP

10 Turntable 1. Hook....................... (K1) x2 10-4

11 Disc Tray 1.

12 CD Servo PWB 1. Screw ..................... (M1) x1 10-6

13 CD Mechanism 1. Hook....................... (N1) x2 11-1

14

Note 1: How to open the changer manually. (Fig. 9-3)

1. In this state, turn fully the lock lever in the arrow direction through

2.

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

Note 2:

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

REMOVAL

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

2 Side Panel 1. Screw ..................... (B1) x8 9-1

(Left/Right)

3 CD Player Unit/ 1. Turn on the power supply, 9-2

CD Tray Cover open the disc tray, take out

4 Rear Panel with 1. Screw ..................... (D1) x9 9-2

Fan Motor 2. Socket .................... (D2) x1

5 Main PWB 1. Screw ..................... (E1) x3 9-2

6 Front Panel 1. Screw ..................... (F1) x2 10-2

7 Display PWB 1. Screw..................... (G1)

8 Tape Mechanism 1. Open the cassette holder. 10-3

9

Headphones PWB

(Note 2) 2. Hook....................... (M2) x2

Loading Motor PWB

the hole on the loading chassis bottom.

While holding the lock lever, rotate the cam gear anticlockwise until the

cam gear rib engages with the clamp lever.

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

PROCEDURE

the CD tray cover, and close.
(Note 1)

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

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

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

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

2. Socket .................... (E2) x3 10-2

3. Flat Cable .............. (E3) x1

4. Flat Wire................. (E4) x1

2. Flat Cable .............. (G2) x1

2. Screw...................... (H1) x5

1. Screw ..................... (J1) x1 10-3

2. Cover ..................... (K2) x1

Turn fully the lock lever in the

arrow direction

2.

While holding the lock lever,rotate
the cam gear until the cam gear
rib engages with the clamp lever.

3.

Push the slide holder backward to

engage the claw with the groove
and remove it in the direction

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

3. Socket .................... (M3) x4

2. Hook....................... (N2) x3

1. Hook....................... (P1) x5 11-1

.

(Fig. 10-1)

(L1) x6

x11

FIGURE

10-3

9-3

10-1

10-5

CD-BA250/CD-BA2600

CD-BA250/CD-BA2600

Figure 9-1

Figure 9-2

Lock Lever

CD Player Unit
(Bottom View)

Figure9-3

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.

– 9 –

CD-BA250/CD-BA2600

Turntable

Slide
Chassis

(K2)x1

CD Player Unit

(K1)x2

Figure 10-1

(E2)x2

(E1)x2

ø3x10mm

Power PWB

(E3)x1

(E2)x1

Clamp Lever

CD Player Unit
(Top View)

Cam Gear Rib

(E4)x1

Headphones
PWB

Figure 10-4

(L1)x3

Power­transformer
PWB

(G1)x11
ø3x10mm

Tape
Mechanism

(H1)x5
ø3x10mm

(J1)x1
ø3x10mm

Main PWB

Figure 10-2

(G2)x1

(F1)x2

ø3x8mm

Display PWB

Open

Cassette
Holder

1

(M2)x2

(M3)x2

2

(M1)x1
ø3x8mm

(M3)x2

Figure 10-5

CD Video

PWB

3

(L1)x3

Slide
Chassis

Headphones
PWB

Figure 10-3

Figure 10-6

– 10 –

CD-BA250/CD-BA2600

CD
Mechanism

(N1)x1

(N2)x3

(N1)x1

Figure 11-1

Loading
Motor
PWB

(P1)x5

CP-BA250/CP-BA2600

STEP

Front Panel

Speaker Boox

REMOVAL PROCEDURE

1 Front Panel 1. Net......................... (A1) x1 11-2

2 Woofer 1. Screw .................... (B1) x4 11-3

3 Tweeter 1. Screw .................... (C1) x2 11-3

(A1)x1

Screwdriver

Driver should
be pried away
from Speaker Box.

Figure 11-2

FIGURE

(C1)x2

ø3x10mm

Tweeter

(B1)x4

ø4x12mm

Woofer

Figure 11-3

– 11 –

CD-BA250/CD-BA2600

REMOVING AND REINSTALLING THE MAIN PARTS

TAPE MECHANISM SECTION

Perform steps 1 to 6 and 8 of the disassembly method to
remove the tape mechanism.

How to remove the record/playback and erase
heads (TAPE 2) (See Fig. 12-1)

1. When you remove the screws (A1) x 2 pcs., the recording/
playback head and three-dimensional head of the erasing
head can be removed.

Erase Head

TAPE 2

Record/Playback
Head

How to remove the playback head (TAPE 1)
(See Fig. 12-2)

1. When you remove the screws (B1) x 2 pcs., the playback
head.

How to remove the pinch roller (TAPE 1/2)
(See Fig. 12-3)

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

Note:

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

How to remove the belt (TAPE 2) (See Fig. 12-4)

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 1) (See Fig. 12-4)

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

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

(A1)x2
Ø2 x 9mm

(B1)x2
Ø2 x 9mm

Figure 12-1

TAPE 1

Figure 12-2

Playback
Head

How to remove the motor (See Fig. 12-5)

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

Motor

(F1) x2

Ø 2.6 x 5mm

– 12 –

TAPE 2

Pinch Roller
(C1)x1

FF/REW
Belt
(D2)x1

Main Belt
(D1)x1

Pull

<B>

Figure 12-3

Motor

Figure 12-4Figure 12-5

<A>

TAPE 2
Main Belt
(D1)x1

Pinch
Roller
Pawl

Motor

TAPE 1
Main Belt
(E1)x1

TAPE 1

FF/REW
Belt
(E2)x1

CD-BA250/CD-BA2600

TAPE MECHANISM

Tape
Motor

Variable Resistor in motor

CD MECHANISM SECTION

Perform steps 1, 2, 3, 10,11,12 and 13 of the disassembly
method to remove the CD mechanism.

How to remove the loading motor
(See Fig. 13-1)

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

2. Remove the drive belt (A2) x 1pc.

How to remove the pickup (See Fig. 13-2)

1. Remove the stop washer (B1) x 1 pc., to remove the gear
(B2).

2. Remove the screws (B3) x 2 pcs., to remove the shaft (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.

CD Player
Chassis

(B1) x2
ø2.6 x6mm

Loading Motor

(A1)x2

Figure 13-1

Stop Washer
(B3) x1

Pulley

Drive Belt
(A2) x1

(A1)x1

(A1)x2

Loading
Motor

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter Specified Value

Play: TW-2111 Tape 1: Over 80 g

• Torque Check

Torque Meter

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

Tape 2: Over 80 g

Specified Value

Tape 1

Tape 2

Shaft
(B2) x1

Gear

CD Mechanism

(B4) x1

Figure 13-2

• Tape Speed

Test Tape

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

Adjusting

Point

motor. (Load

Specified

Value

Instrument

Connection

resistance:
6 ohms)

Pickup

Figure 13-3

– 13 –

CD-BA250/CD-BA2600
TUNER SECTION

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

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage

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

Frequency Frequency

Display

Setting/

Adjusting

Parts

R316

TP301

FM BAND
COVERAGE fL

Instrument

Connection

CNP301

FM/AM LOOP

ANTENNA

IC301

T301

• FM RF

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

Test Stage

Frequency Frequency

Display

FM Band — 87.50 MHz T301(fL): *1
Coverage 1.3 V ± 50 mV

FM RF 98.00 MHz 98.00 MHz L312 *2

(10-30 dB)

Setting/

Adjusting

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

MAIN PWB

T303

AM
TRACKING fL

AM BAND

T302

FM IF

T351

AM IF

L312

FM RF

COVERAGE fL

T306

Instrument

Connection

Point

Figure 14-1 ADJUSTMENT POINTS

CD SECTION

• Adjustment

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.

Items adjusted automatically

(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

Fig.14-2 EFBL)

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

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

* Focus gain adjustment
* Tracking gain adjustment

TP302

R357

CD ERROR CODE DESCRIPTION

Error

[Servo System Error]
0001 Cannot detect Pickup-in SW
0002 DSP access error

[Error during close operation]
0101 Open/Close SW not functioning (Low → High)
0103 Open/Close SW not functioning (High → Low)

[Error during open operation]
0201 Open/Close SW not functioning (Low → High)
0203 Open/Close SW not functioning (High → Low)

[Error during skip operation]
0302 Pickup-in SW is not detected
0306 During Disc 1 search, Open/Close SW or Clamp SW

or Disc SW do not change to low.
0307 Clamp SW not function (Low → High)
0308 Clamp SW not function (High → Low)

T

1

3

Stopped

FDO

TE

CH1=500mV

DC 10:1

T

CH2=200mV

DC 10:1

State Code

CH3=1V

DC 10:1

1999/04/05 20:26:47

500ms/div

(500ms/div)

NORM:20kS/s

– 14 –

EFBL

2

Smoothing : ON CH1 : 0.000V
BW : FULL

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

Figure 14-2

=Record Length=

Main : 100K
Zoom : 2k

CH2
v/DIV
200mV

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

TEST MODE

·Setting the test mode
Any one of test mode can be set by pressing several keys as follows.
<X-BASS> + <CD> + <POWER> TEST:CD operation test

Function:-CD test mode.

-Enter test mode.

C D T E S T

OPEN/CLOSE operation is using manual.

<< >>, << >> buttons make pick's slide possible.

CD-BA250/CD-BA2600

IL isn't done

<<MEMORY>>
key input

Adjustment result
automatically will
display as below
for each 2 sec :
a) "FOFF_XX"
b) "TOFF_XX"
c) "TBAL_XX"
d) "TGAN_XX"
f) "FGAN_XX"
g) "RFLS_XX"

explanation:
a) Focus off set ="FOFF_XX"
b) Tracking off set ="TOFF_XX"
c) Tracking balance ="TBAL_XX"
d) Tracking gain ="TGAN_XX"
f) Focus Gain ="FGAN_XX"
g) RF level shift ="RFLS_XX"

VOL — Last memory
BAL — CENTER
P.GEQ — FLAT
X-BASS — OFF

To cancel : Power OFF

<<PLAY>> key input.

Do TOC IL. Do normal play
When these following key is input
into PLAY key, track number can
be appoint directly

<< 1>> key: Track 4
<< 2>> key: Track 9
<< 3>> key: Track 15

<<STOP>> key input.

STOP

XX: Hex value

<<MEMORY>> key input.

Laser ON.

<<MEMORY>> key input.

Tracking OFF play at that
specific point.

<<MEMORY>> key input.

Tracking ON play from
that specific point.

Adjustment result auto­matically will display as
below
for each 2 sec :
a) "FOFF_XX"
b) "TOFF_XX"
c) "TBAL_XX"
d) "TGAN_XX"
f) "FGAN_XX"
g) "RFLS_XX"

<<STOP>> key input.

STOP

Sliding the PICKUP with
<<

>>, << >> button

must only be in STOP mode.

– 15 –

CD-BA250/CD-BA2600

Standard Specification of Stereo System Error MessageDisplay Contents

Error Contents DISPLAY Notes
Output while Device Protection Operation 'PROTECT' 00: While in Protect Circuit Operate

01: Over Current Detection
02: DC Detection
03:

TAPE Mechanism Error 'ER-TA**' 00: Tape Mechanism Error

01: Initial Error
02:
03:

CD/VCD Pickup Mechanism Error 'ER-CD**' 00: Pickup Mechanism Error

01: PU-IN SW Detection NG
02:
03:
04:

CD Changer Mechanism Error 'ER-CD**' 10: Changer Error

11: Initial Error
12:
13:

Tray Error 'ET-CD**' 20: Tray Error

21:
22:

23:
Focus Not Match 'NO DISC'
IL Time Over 'NOT READ'

TUN PLL Unlock 'ER-TU**' 00: TUN Error

01: PLL Unlock

02:

03:

– 16 –

TO MAIN SECTION

TO DISPLAY SECTION

SW1
OPEN/
CLOSE

CD-BA250/CD-BA2600

SW3

SW2

DISC

CLAMP

NUMBER

T/T UP DOWN

M

M3

LOADING

XL1

33.8688MHz

61
62
63
64
65
66

48

49

+3.3V

CNP7

CE
CLK
DI
DO
WRQ
RES

XOUT

XIN

R-CH

RFVDD

5

AGND

VVDD

7

L-CH

ADAVDD

18

47

DGND

XVDD

+5V

615432

+5V

42

LCHO

WRQ

4543 44 25 70

LVSS

RVSS

RCHO

IC1

LC78645E

CD SERVO

RVDD

41

LVDD

46

FIN1

FIN2

987

3271689

Q3

71

CONT2

CONT3

CONT4

CONT5

SLDO
SPDO

LDD

LDS

TIN2

TIN1

80

79

10

FD0
TD0

CNP8

75
69
57
56
55
51
50

40

37
28
19

26

23
22
21
20

OC. DISC NO

CLAMP SW

CD RES

CLK

DI

DO

CE

DRF

54

+5V

316452

316452

316452

17 25

12

18

VCC1

40

VCC4

24

VCC2

23

VCC3

M63001FP

FOCUS/TRACKING/

SPIN/SLED

DRIVER

CNS4

CNP4

IC2

BI4

41 8339

42

35

29
22

21

14

8

CONSTANT

VOLTAGE

+5V

PICK UP UNIT

Q2

LASER

DRIVER

+3.3V

Q1

FOCUS COIL

TRACKING COIL

4765

M1

SPINDLE

MOTOR

M2

SLED

MOTOR

M

M

15

168226 27

SW1

PICK UP

IN

Figure 17 BLOCK DIAGRAM (1/3)

– 17 –

CD-BA250/CD-BA2600

A

T

AM

FM

CNP301

CNP7

FROM CD SECTION

IC301

TA7358AP

FM FRONT END

BF301

B.P.F

1

2

3

FM

L312 T301

RF

AM TRACKING

T303 T306

PLL(TUNER)

VIDEO/AUX IN

L

R

BI601

1
2
3

4

5

7

FM

AM BAND
COVERAGE

IC302

LC72131

JK690

AUX

6
9

8

OSC

FM

OSC

Q302

+B

FM

SWITCHING

FM IF

OSC BUFF

VT

+B4

Q360

CF303T302

450kHz

T351

CF352

AM IF

21

AM MIX

21

AM OSC IN

AM RF IN

X352

4.5MHZ

20 22 11

OSC

FM

TUNER

7

TAPE

CD

1615

R

9

L

16

L

10
15

R

L

11
14

R

L

12
13

R

FM/AM

9

10.7MHz

1623

FM

MPXIN

DET

X351

456kHz

13

VCO

L

MO/ST

R

FM/AM

12

14
15

4

GND

AM IF

FM/AM

18

7

CF351

98517

FM+B

OUT

IC303

LA1832S

STEREO

FM IF DET.

FM MPX./

AM IF MPX.

CLK

DO

DI

CE

5413

6

21

IC601

17

+B4

23

DI

CE

CLK

1
2

24

–20dB

R

21

4

L

MO/ST

10

LC75341

AUDIO PROCESSOR

7

81817

3

ATT

+B4

Q601
Q602

TAPE 1

PB HEAD

TAPE 2

REC PB HEAD

L-CH
R-CH

L-CH

R-CH

ERASE

HEAD

REC

P.B.

AC BIAS

SWITCHING
Q103­Q104

POP REDUCE

SWITCHING
Q105
Q106

BIAS

Q111

L103

OSC

L(T1)
R(T1)

L(T2)
R(T2)
L NF
R NF

L REC
R REC

REF

Q112
SWITCHING

1

24

2

23

3

22

6
9

16
14

12

SWITCHING

T1/T2
REC

NOR/
HIGH

15

Q114

P.B

T1/T2

H/N

19

Q113

+B4

13

L

4

PB

21

R

5

20

REC

L

7

18

R

L NF

8

R NF

17

10

ALC

SWITCHING
Q109

IC101
AN7345K
PLAYBACK AND RECORD
/PLAYBACK AMP.

BIAS

Q110

Figure 18 BLOCK DIAGRAM (2/3)

– 18 –

Q107
Q108

MUTING

–B2

REC/PL

+B4

8

IC561

4

IC562

1

7

IC561,IC562

KIA4558P

OPE AMP.

CD-BA250/CD-BA2600

+B4

dB
T

Q601
Q602

REC/PLAY

+B4

8

1

561

7

562

1,IC562
4558P

E AMP.

28

29

T1/T2

(2/2)

IC701

VF1

IX0399AW

FL DISPLAY

14

13 44

6 132

Q701-Q703

5756 54 5352515055 4948

67
78

80

VLOAD

79
81

–

89

90

SP. DET.

1

L

15

R

+Vcc

8

–Vcc

9

Q907
Q908

13

–

92
93

-

100

12456 78

+B5

L-OUT

7

10

R-OUT

IC901

MICROCOMPUTER

VDD

Q902
Q903
Q905
Q904

–B2

STK4029S
POWER AMP.

-B1

+B1

M12

+B3

VF2

+B4

–VF

CONSTANT VOLTAGE REGULATOR

IC902

KTC2026

IC903

A+10V

KIA7810AP

VOLTAGE REGULATOR

+5V

UN-SW5V

+B5

IC904

KIA7805AP

D901

D902~D905

FL701

16

31

23

32

+B5

IC701

IX0399AW(1/2)

SYSTEM

RESET

1 0 16 1 7 20 21232224

1112 13

9

Q709

4A/125V

4A/125V

2A/125V

F903

2A/125V

Q901

VDD

+B5

XL700

4.194304MHz

+B5

F901

F902

F904

47

4948

4344 42 40

4546

VDD

AVDD

CLK

CEDIDO

–

Q914

RL914

PT801

POWER

TRANSFORMER

T.F.

RX701

39

36
35

+B5

34
33

–

31

REMOTE

1

SENSOR

2

KEY
SW701-SW703
SW712-SW718
SW720-SW727
SW729-SW732

TO CD

SECTION

JK701
HEADPHONES

Q906

AC POWER

SUPPLY CORD

AC120V/60Hz

3

+B5

+B3

+B5

M901

M

FAN

MOTOR

SO901
SPEAKER
TERMINAL

BIAS

Figure 19 BLOCK DIAGRAM (3/3)

– 19 –

CD-BA250/CD-BA2600

9

0
1
2
3
4
5
6
7
8
9
0

8

7

6

5

4

3

2

L

R14

A

PICKUP UNIT

B

C

TR+

D

TR–

CD MOTOR PWB-F

E

M1

SPINDLE

MOTOR

M2

SLED

MOTOR

SW4

PICKUP IN

F

FO+
FO–

M

M

GND

+
–

+
–

VREF

SPIN

SLIDE

PU-IN

VCC

TR–
TR+

FO+
FO–

PD
VR

LD

CD SERVO PWB-C

CD SIGNAL

R7

47

7
6
5
4
3
2
1

1
2
3
4
5
6
7
8

CNS3A

6
5
4
3
2
1

CNS1A

7
6
5
4
3
2
1

CNS2A

1
2
3
4
5
6
7
8

6
5
4
3
2
1

VCC
VREF
E
A
B

F
C

CNP1

TR–
TR+
FO+
FO–
GND
PD
VR
LD

CNP2

SP+
SP–
SL+
SL–

PUIN
GND

CNP3

R4

12K

R6

33K

R5

12K

R3

33K

C1

R1

12K

47/25

100/10

C40

R2

C38

0.01

C39

MUTE

220/6.3

12K

C2

0.01

–

+

VREF

–

+

R44

VCC

STANDBY

++–

+

–

+

–

+

–

+

12K

SLDO

–

–

R9

3.3

C3

47/25

Q1

C49

KTA1266 GR

SL–

SL+

C4

47/25

0.001

101112131415161718192021

IC2

M63001FP
FOCUS/TRACKING/
SPIN/SLED DRIVER

R10
27K

TP3

9

(CH)

GND

8

C6

0.1

C7

100P

C50
22P

C9

100/10

TR–

7

TP2

TR+

6

C12

100P

C5

0.047(ML)

R12
330

C8

0.0047
TP1

C10

10/50

C11

0.22/50

4

R13

FO+

FO–

5

432

1K

R11

1

10K

1

1
1
1
1
1
1
1
1
1
1
2

2

FD

CNS1B

7

7

6

6

E

5

5

A

4

4

B

3

3

F

2

2

C

1

1

CNS2B

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

CNS3B

1

1

2

2

3

3

4

4

5

5

6

6

G

H

• NOTES ON SCHEMATIC DIAGRAM can be found on page 37.

1

23456

Figure 20 SCHEMATIC DIAGRAM (1/9)

– 20 –

M–

M+

VCC4

22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

SP–

SP+

SPO

VCC2

VCC3

C41
100/10