Sharp CD-BP1200W,CD-BP1250W Service Manual

– 1 –

CD-BP1200W/1250W

No. S6052CDP1200W

CONTENTS

Page

SAFETY PRECAUTION FOR SERVICE MANUAL ........................................................................................................... 2

VOLTAGE SELECTION..................................................................................................................................................... 2

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

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

OPERATION MANUAL ...................................................................................................................................................... 6

DISASSEMBLY.................................................................................................................................................................. 8

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

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

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 14

TYPES OF TRANSISTOR AND LED................................................................................................................................14

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

SCHEMATIC DIAGRAM .................................................................................................................................................. 18

VOLTAGE ........................................................................................................................................................................ 27

WIRING SIDE OF P.W.BOARD....................................................................................................................................... 28

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 34

TROUBLE SHOOTING .................................................................................................................................................... 35

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

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

REPLACEMENT PARTS LIST/EXPLODED VIEW

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

SERVICE MANUAL

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

CD-BP1200W Mini Component System consisting of
CD-BP1200W (main unit) and CP-BP1200 (speaker system).

SHARP CORPORATION

CD-BP1250W Mini Component System consisting of
CD-BP1250W (main unit), CP-BP1250 (front speaker) and
GBOXS0043AWM1 (surround speaker).

Illustration: CD-BP1200W

Illustration: CD-BP1250W

MODEL CD-BP1200W

MODEL CD-BP1250W

MINI COMPONENT SYSTEM

MINI COMPONENT SYSTEM

CD-BP1200W/1250W

– 2 –

SAFETY PRECAUTION FOR SERVICE MANUAL

Precaution to be taken when replacing and servicing the Laser Pickup.

The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class 1 Requirements.
However, the following precautions must be observed during servicing to protect your eyes against exposure to the Laser beam.

(1) When the cabinet has been removed, the power is turned on without a compact disc, and the Pickup is on a position outer than

the lead-in position, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens.
(2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior to shipping.
(3) No adjustment to the Laser Power should be attempted when replacing or servicing the Pickup.
(4) Under no circumstances look directly into the Pickup Lens at any time.
(5) CAUTION - Use of controls or adjustments, or performance of procedures other than those specified herein may result in

hazardous radiation exposure.

VOLTAGE SELECTION

Before operating the unit on mains, check the preset voltage. If the voltage is different from your local voltage, adjust the voltage
as follows, turn the selector with a screwdriver until the appropriate voltage number appears in the window (110V, 127V, 220V
or 230V - 240V AC).

QACCE0007AW00

Figure 2 AC POWER SUPPLY CORD AND PLUG ADAPTOR

QACCL0002AW00/QACCZ0008AW00

QACCJ0006AW00

QACCA0004AW00

QPLGA0003AWZZ QPLGA0004AWZZ

CAUTION

This Mini Component System is classified as a CLASS
1 LASER product.

The CLASS 1 LASER PRODUCT label is located on the
rear cover.

Use of controls, adjustments or performance of proce­dures other than those specified herein may result in
hazardous radiation exposure.

As the laser beam used in this compact disc player is
harmful to the eyes, do not attempt to disassemble the
cabinet. Refer servicing to qualified personnel only.

Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW

CAUTION-INVISIBLE LASER RADIATION WHEN OPEN. DO NOT STARE INTO
BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS.

VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD. STIRRA
EJ IN I STRALEN OCH BETRAKTA EJ STRALEN MED OPTISKA INSTRUMENT.

ADVERSEL-USYNLIG LASERSTRALING VED ABNING. SE IKKE IND I
STRALEN-HELLER IKKE MED OPTISKE INSTRUMENTER.

VARO! AVATTAESSA OLET ALTTIINA NAKYMATON LASERSATEILYLLE.
ALA TUIJOTA SATEESEEN ALAKA KATSO SITA OPTISEN LAITTEEN LAPI.

VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD.
STIRRA EJ IN I STRALEN OCH BETRAKTA EJ STRALEN GENOM OPTISKT
INSTRUMENT.

ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.

– 3 –

CD-BP1200W/1250W

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

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

SPECIFICATIONS

CD-BP1200W/1250W

CP-BP1200/1250

GBOXS0043AWM1

General

Amplifier section (CD-BP1200W)

Compact disc player section

Tuner section

Power source:

AC 110/127/220/230-240 V,
50/60 Hz

Power
consumption:

32 W

Dimensions:

Width; 270 mm (10-5/8")
Height; 300 mm (11-13/16")
Depth; 373 mm (14-11/16")

Weight:

5.0 kg (11.0 lbs.)

Output power:

MPO; 32 W (16 W + 16 W)
(10 % T.H.D.)

RMS; 20 W (10 W + 10 W)
(10 % T.H.D.)

RMS; 14.6 W (7.3 W + 7.3 W)
(0.9 % T.H.D.)

Output terminals:

Front speakers; 8 ohms
Headphones; 16 - 50 ohms
(recommended; 32 ohms)

Type:

3-disc multi-play compact disc
player

Signal readout:

Non-contact, 3-beam semi-con­ductor laser pickup

D/A converter:

1-bit D/A converter

Frequency
response:

20 - 20,000 Hz

Dynamic range:

90 dB (1 kHz)

Frequency range:

FM; 88 - 108 MHz
AM; 531 - 1,602 kHz

Amplifier section (CD-BP1250W)

Output power:

MPO; 32 W (16 W + 16 W)
(10 % T.H.D.)

RMS; 20 W (10 W + 10 W)
(10 % T.H.D.)

RMS; 14.6 W (7.3 W + 7.3 W)
(0.9 % T.H.D.)

Output terminals:

Front speakers; 8 ohms
Surround speakers; 16 ohms
Headphones; 16 - 50 ohms

(recommended; 32 ohms)

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)

Type:

10 cm (4") full-range speaker

Maximum input
power:

20 W

Rated input power:

10 W

Impedance:

8 ohms

Dimensions:

Width; 220 mm (8-11/16")
Height; 300 mm (11-13/16")
Depth; 180 mm (7-1/16")

Weight:

2.0 kg (4.4 lbs.)/each

Type:

8 cm (3-3/32") full-range speaker

Maximum input
power:

10 W

Rated input power:

5 W

Impedance:

16 ohms

Dimensions:

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

Weight:

0.4 kg (0.9 lbs.)/each

CD-BP1250W Only

CD-BP1200W/1250W

– 4 –

NAMES OF PARTS

CD-BP1200W/1250W

Front panel

1.(CD) Disc Number Indicators

2.Timer Indicator

3.Record Indicator

4.Sleep Indicator

5.Extra Bass Indicator

6.(CD/TUNER) Memory Indicator

7.FM Stereo Mode Indicator

8.FM Stereo Indicator

9.(CD) Repeat Indicator

10.(CD/TAPE) Play Indicator

11.(CD) Pause Indicator

12.(CD) Disc Tray

13.Timer Set Indicator

14.On/Stand-by Button

15.Timer/Sleep Button

16.Clock Button

17.Function Selector Buttons

18.Headphone Socket

19.Equalizer Mode Selector/Extra Bass/
Demo Mode Button

20.Volume Up/Down Buttons

21.Tuning and Time Up/Down Buttons

22.(TAPE 1) Cassette Compartment

23.(TAPE 2) Cassette Compartment

24.(CD) Disc Skip Button

25.(CD) Track Down/Review Button
(TUNER) Preset Down Button
(TAPE 2) Rewind Button

26.(CD) Track Up/Cue Button
(TUNER) Preset Up Button
(TAPE 2) Fast Forward Button

27.(CD) Open/Close Button

28.Memory/Set Button

29.(CD/TAPE) Stop Button

30.(TAPE 2) Record Pause Button

31.(CD) Play/Repeat Button
(TAPE) Pl ay Button

1234 5678

11109

1914

15
16
17

18

22

24

28
29

30
31

23

13

12

20
21

25 26 27

– 5 –

CD-BP1200W/1250W

GBOXS0043AWM1

CP-BP1200/1250

Rear panel

1.AC Voltage Selector

2.AC Power In put Socket

3.Surround Speaker Terminals
(CD-BP1250W Only)

4.Front Speaker Terminals

5.Span Selector Switch

6.FM Aerial Earth Terminal

7.FM 75 Ohms Aerial Terminal

8.AM Loop Aerial Input Socket

1.Full-Range Speaker

2.Bass Reflex Duct

3.Speaker Wire

1.Full-Range Speaker

2.Speaker Wire

Remote control

1.Remote Control Transmitter LED
CD control section

2.Disc Number Select Buttons

3.Memory Button

4.Pause Button

5.Clear Button

6.Track Down/Review Button

7.Track Up/Cue Button

8.Disc Skip Button

9.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 U

p

/Down Buttons

1
2

3
4

5
6

7
8

1
2

3

1
2

1

9
10
11
12

151413 161718

3
4

5
6

7

19
20
21

23

22

8

2

CD-BP1250W Only

CD-BP1200W/1250W

– 6 –

OPERATION MANUAL

PREPARATION FOR USE

Connecting the AC power lead

Check the setting of the AC voltage selector located on the
rear panel before plugging the unit into an AC socket. If nec­essary, adjust the selector to correspond to the AC power
voltage used in your area.

Selector adjustment:

Turn the selector with a screwdriver until the appropriate
voltage number appears in the window (110 V, 127 V, 220 V
or 230 V - 240 V AC).

Notes:

Plug the AC power lead into an AC socket, after any con­nections.
Unplug the AC power lead from the AC socket if the unit
will not be in use for a prolonged period of time.
Never use a power lead other than the one supplied. Use
of a power lead other than the one supplied may cause
an electric shock or fire.

AC Plug Adaptor

In areas (or countries) where an AC socket as shown in
illustration is used, connect the unit using the AC plug
adaptor supplied with the unit, as illustrated. The AC plug
adaptor is not included in areas where the AC wall socket
and AC power plug can be directly connected (see illustra­tion ).

Note for users in Au stralia and New Zealand:

An AC plug adaptor is not supplied if the lead has an Austra­lian Standard plu

g

.

AM/FM interval (span)

The International Telecommunication Union (ITU) has
established that member countries should maintain either a
10 kHz or a 9 kHz inter val between broadcasting frequen­cies of any AM station. The illustration shows the 9 kHz
interval zones (regions 1 and 3), and the 10 kHz interval
zone (region 2).
Before using the unit, set the SPAN SE LECTOR switch (on
the rear panel) to AM tuning interval (span) of your area.

To change the tuning zone:

1

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

2

Set the SPAN SELECTOR switch to "50/9" for 9 kHz
AM interval (50 kHz FM interval), and "100/10" for 10
kHz AM interval (100 kHz FM interval).

3

Whilst 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.

To an AC socket

1

2

– 7 –

CD-BP1200W/1250W

SETTING THE CLOCK

In this example, the clock is set for the 24-hour (0:00) sys-

tem.

1

Press the ON/STAND-BY button to enter the stand-

by mode.2Press 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.

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

installed or it has been reset.

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 con-

tinuously .

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

automatically 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 lead 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 "RESETTING THE MICROCOM-

PUTER".

2 Perform steps 1 - 9 above.

(Main unit operation)

"0:00" The 24-hour display will appear.

(0:00 - 23:59)

"AM 0:00" The 12-hour display will appear.

(AM 0:00 - PM 11:59)

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

(AM 12:00 - PM 11:59)

ON/

STAND-BY

CLOCK

MEMORY/SET

TUNING/TIME

( )

AM 0:000:00 AM 12:00

PREPARATION FOR USE

Remote control

When inserting or removing the batteries, push them

towards the battery terminals.

Installing the batteries incorrectly may cause the unit to

malfunction.

Precautions for battery use:

Insert the batteries according to the direction indicated in

the battery compartment.

Replace all old batteries with new ones at the same time.

Do not mix old and new batteries.

Remove the batteries if they are weak or if the unit will

not be used for long periods of time. This will prevent

potential damage due to battery leakage.

Caution:

Do not use rechargeable batteries (nickel-cadmium battery,

etc.).

Notes concerning use:

Replace the batteries if the operating distance is reduced

or if the operation becomes erratic.

Periodically clean the transmitter LED on the remote con-

trol and the sensor on the main unit with a soft cloth.

Exposing the sensor on the main unit to strong light may

interfere with operation. Change the lighting or the direc-

tion of the unit.

Keep the remote control away from moisture, excessive

heat, shock, and vibrations.

2 "AA" size batteries (UM/SUM-3, R6, HP-7 or similar)

15

15

0.2 m - 6 m

(8" - 20')

RESETTING THE MICROCOMPUTER

Reset the microcomputer under the following condi-

tions:

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.2Whilst 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

ON/

STAND-BY

CD-BP1200W/1250W

– 8 –

1 Top Cabinet 1. Screw ..................... (A1) x4 8-1

2 Side Panel 1. Screw ..................... (B1) x2 8-1

(Left/right) 2. Screw ..................... (B2) x2

3 CD Player Unit/ 1. Turn on the power supply, 8-2

CD Tray Cover

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

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

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

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

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

4 Rear Panel 1. Screw ..................... (D1) x8 8-2

5

Main/Headphones 1. Screw........................

(E1) x8 9-2

PWB 2. Socket .................... (E2) x4

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

4. Lug Wire................. (E4) x1

6 Front Panel 1. Screw ..................... (F1) x3 9-2

7 Display PWB 1. Screw .....................

(G1) x9

9-3

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

8 Tape Mechanism 1. Open the cassette holder. 9-3

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

9 Turntable 1. Hook....................... (J1) x2 9-4

2. Cover ..................... (J2) x1

10 Disc Tray 1.

Turn fully the lock lever in the

8-3

arrow direction.

2.

While holding the lock lever, rotate

9-1

the cam gear until the cam gear

rib engages with the clamp lever.

3.

Push the slide holder backward to

9-5
engage the claw with the groove
and remove it in the direction

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

(K1) x6

11 CD Servo PWB 1. Screw ..................... (L1) x1 9-6

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

3. Socket .................... (L3) x4

12 CD Mechanism 1. Hook....................... (M1) x2 10-1

2. Hook....................... (M2) x3

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.

Figure 8-2

Figure 8-3

STEP REMOVAL

PROCEDURE

FIGURE

Note 1:

How to open the changer manually. (Fig. 8-3)

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 anti clockwise

until the cam gear rib engages with the clamp lever.

(Fig. 9-1)

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

Note 2:

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

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

Figure 8-1

CD-BP1200W/1250W

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.

(B2)x1
ø3x10mm

(B2)x1
ø3x10mm

Side Panel
(Right)

Side Panel
(Left)

Top Cabinet

Rear
Panel

(A1)x2
ø3x12mm

(A1)x2
ø3x12mm

(B1)x2
ø3x12mm

Front Panel

(C3)x1

(C1)x1
ø3x12mm

(D1)x8
ø3x8mm

CD Player
Unit

CD Tray Cover

Rear
Panel

Pull

(C3) x1

(C4)x2

(C2) x3

1

1

2

Main PWB

CD Servo
PWB

Front Panel

Lock Lever

CD Player Unit
(Bottom View)

CD-BP1200W/1250W

– 9 –

CD-BP1200W/1250W

Figure 9-2

Figure 9-3

Figure 9-4

Figure 9-5

Figure 9-6

Turntable

Disc Tray

(J2) x1

Loading Chassis

(J1) x2

1

2

(K1) x3

(K1) x3

Disc Tray

Loading Chassis

(L3) x2

(L2) x3

(L3) x2

CD Servo

PWB

Disc Tray

(L1)x1
ø3x8mm

(E2)x2

(E2)x1

(E2)x1

(E3)x1

Headphones
PWB

(E1)x7
ø3x10mm

Main PWB

(E1)x1
ø3x10mm

(E4)x1

(F1)x3
ø3x8mm

Front Panel

(G1)x9
ø3x10mm

(G2)x1

(H1)x5
ø3x10mm

Display PWB

Open

Cassette
Holder

Tape
Mechanism

Front Panel

Clamp Lever

CD Player Unit
(Top View)

Cam Gear Rib

Figure 9-1

CD-BP1200W/1250W

– 10 –

Figure 10-2

Figure 10-1

Figure 10-3

(M2) x3

(M1) x1

(M1) x1

CD
Mechanism

Disc Tray

Speaker Box

(A1)x1

(A2)x1

Driver should
be pried away
from Speaker Box.

Screwdriver

Speaker Box

Speaker

(A3)x4
ø3.5x13mm

STEP REMOVAL

PROCEDURE

FIGURE

1 Speaker 1. Net Frame Ass’y.....(A1) x1 10-2

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

3. Screw......................(A3) x4 10-3

CP-BP1200/1250

– 11 –

CD-BP1200W/1250W

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. 11-1)

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

How to remove the playback head (Tape 1)
(See Fig. 11-2)

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

How to remove the pinch roller (Tape 1/2)
(See Fig. 11-3)

1. Carefully bend the pinch roller pawl in the direction of the
arrow <A>, and remove the pinch roller (C1) x1 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. 11-4)

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. 11-4)

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. 11-5)

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

Figure 11-1

Figure 11-2

Figure 11-3

Figure 11-4Figure 11-5

TAPE 2

TAPE 1
Main Belt
(E1)x1

TAPE 2
Main Belt
(D1)x1

TAPE 1

FF/REW
Belt
(D2)x1

FF/REW
Belt
(E2)x1

Motor

Motor

(D1)x1
Main Belt

(E1)x1
Main Belt

(A1)x2
Ø2 x 9mm

TAPE 2

Record/Playback
Head

Erase Head

(B1)x1
Ø2x9mm

(B1)x1
Ø2x5mm

TAPE 1

Playback
Head

Pinch Roller
(C1)x1

<A>

Pull

<B>

Pull

Pinch
Roller
Pawl

(F1) x2

Ø 2.6 x 5mm

Motor

TAPE 2

CD-BP1200W/1250W

– 12 –

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

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.

Figure 12-2

CD MECHANISM SECTION

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

How to remove the loading motor
(See Fig. 12-1)

1. Bend the hooks (A1) x 5 pcs., to remove the T/T Up/Down
motor.

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

Figure 12-1

Note

After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector to protect the optical pickup from
electrostatic damage.

(A1)x3

T/T Up/Down Motor

Disc Tray

(A1)x2

Pulley

Drive Belt
(A2) x1

Motor

(B1) x2
ø2.6 x6mm

Shaft
(B2) x1

Stop Washer
(B3) x1

Gear
(B4) x1

CD Mechanism

Pickup

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter

Specified Value

Play: TW-2111 Tape 1: Over 80 g

Tape 2: Over 80 g

• Torque Check

Torque Meter

Tape 2

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 1

Specified

Value

Adjusting

Point

Instrument

Connection

Test Tape

Normal MTT-111 Variable

3,000±30 Hz

Speaker

speed Resistor in terminal

motor. (Load

resistance:
6 ohms)

• Tape Speed

Figure 12-3

TAPE MECHANISM

Motor

Variable Resistor
in motor

– 13 –

CD-BP1200W/1250W

CD SECTION

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

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

TUNER SECTION

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

AM IF 450 kHz 1,602 kHz T351 *1
AM Band — 531 kHz (fL): T306 *2

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

Figure 13-1 ADJUSTMENT POINTS

Test Stage Frequency

Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

IC301

R381

TP302

TP301

R357

AM IF

T303

T306

AM
TRACKING fL

FM BAND
COVERAGE fL

AM BAND
COVERAGE fL

T351

MAIN PWB

CNP302

AM LOOP

ANTENNA

1

T301

T302

SO302

FM TERMINAL

FM RF

L312

FM IF

Figure 13-2

CD ERROR CODE DESCRIPTION

Error State Code

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

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

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

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

Since this CD system incorporates the following automatic
adjustment functions, readjustment is not needed when
replacing the pickup. Therefore, different PWB and pickup
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.

13-2 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

• Adjustment

T

T

EFBL

FDO

TE

Stopped

CH1=500mV

DC 10:1

CH2=200mV

DC 10:1

CH3=1V
DC 10:1

500ms/div

(500ms/div)

NORM:20kS/s

1

2

3

=Record Length=

Smoothing : ON CH1 : 0.000V

CH2 : 0.000V

Main : 100K
Zoom : 2k

Mode : SINGLE
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2µs

CH3 : 0.00V
CH4 : 0.00V

BW : FULL

=Trigger==Filter= =Offset=

CH2
v/DIV
200mV

1999/04/05 20:26:47

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

• FM RF

Signal generator: 400Hz, 22.5 kHz dev., FM modulated

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)

Test Stage

Instrument

Connection

Frequency

Frequency

Display

Setting/

Adjusting

Point

CD-BP1200W/1250W

– 14 –

• The indicated voltage in each section is the one measured
by Digital Multi meter 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.

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 micro farad. As to
electrolytic capacitor, the expression “capacitance/withstand
voltage” is used.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type

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

REF. NO DESCRIPTION POSITION POSITIONREF. NO DESCRIPTION

SW1 OPEN/CLOSE ON—OFF
SW2 CLAMP ON—OFF
SW3 DISC NUMBER ON—OFF
SW4 PICKUP IN ON—OFF
SW601 SPAN SELECTOR

50/9kHz-100/10kHz
SW701 ON/STAND-BY ON—OFF
SW702 CLOCK ON—OFF
SW703 TIMER/SLEEP ON—OFF
SW709 DISC SKIP ON—OFF
SW710 OPEN/CLOSE ON—OFF
SW711 EQUALIZER/X-BASS/DEMO ON—OFF
SW712 VOLUME UP ON—OFF
SW713 VOLUME DOWN ON—OFF

Figure 14 TYPES OF TRANSISTOR AND LED

(1) (2) (3)

(S) (G) (D)

E C B

FRONT

VIEW

2SC1845 F
2SC3331
KTA1266 GR
KTA1271 Y
KTA1273 Y
KTC3203 Y
KRC102 M
KRC104 M
KRC107 M

4204SRT7

FRONT
VIEW

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
SW724 TUNING/TIME UP ON—OFF
SW725 TUNER (BAND) ON—OFF
SW801 VOLTAGE SELECTOR

110V/120V/220V

/

230-240V

– 15 –

CD-BP1200W/1250W

Figure 15 BLOCK DIAGRAM (1/3)

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

VOLTAGE

+5V

Q1

Q3

LASER

DRIVER

LDD

PD

VCC3

VCC2

VCC4

VCC1

TIN2

TIN1

FIN2

FIN1

IC3

M63001FP
FOCUS/TRACKING/
SPIN/SLED 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-BP1200W/1250W

– 16 –

Figure 16 BLOCK DIAGRAM (2/3)

REC/PLAY

CLK

CE

DI

MUTE

SYSTEM

Q602

Q601

DO

CLK

DI

CE

MO/ST

+B2

SWITCHING

+B2

FM/AM

IC302

LC72131

PLL(TUNER)

OUT

FM/AM

+B2

L

R

BAIS

MUTING

Q110
Q111

P.B.

REC

AC BIAS

L

L

R

R

R

L

TAPE

TUNER

CD

PB

CNS602

FROM CD

SECTION

CNP11

ERASE

HEAD

SWITCHING

SWITCHING

SWITCHING

BIAS

Q102

Q103

Q101

Q113

SWITCHING

Q112
L103

OSC

BIAS

L104

Q114

Q109

Q108

R-CH

L-CH

R-CH

L-CH

IC601

LC75341

AUDIO PROCESSOR

H/N

P.B

+B2

R

L

RECRL

L NF
R NF

ALC

REC

T1/T2

T1/T2 HIGH

NOR/

REF

R REC

L REC

POP

REDUCE

R NF

L NF

SWITCHING

Q104~

Q107

L(T2)
R(T2)

R(T1)

L(T1)

IC101

AN7345K

PLAYBACK AND RECORD/

PLAYBACK AMP.

R

L

FM/AMMPX IN

STEREO

AM RF IN

AM OSC IN

FM +B

Q360

VT

FM OSC

4.5MHZ

X352

COVERAGE

AM BAND

AM

TRACKING

T303

Q302

X351
456kHz

MO/ST

VCO

DET

FM

FM+B

GND

AM IF

CF351

IC303

LA1832S

FM IFDET/

FM MPX. /AM IF

AM MIX

CF352

T351

RF

FM

OSC

FM

L312

CF303

T302

FM FRONT END

TA7358AP

IC301

BF301

FM ANTENNA

TERMINAL

22

3

21

4

24

2

1

8

18

17

5

4

3

9

10

18

11

3

15

10

7

23

14
12
13

1
2

20

19

7

18

10

8

17

13

21

4

5

2

24

23

6
9

16
14
12

15

1

5

1

3

8

4

3

3

1

21

7

9

8

5

6

21

21

20

22

11

17

15

16

9

6

5

7

13

14

12

15

16

23

4

7

1 7

T301

T306

4

FM

REC

PLAYBACK

HEAD

TAPE 2

PLAYBACK

HEAD

TAPE 1

R

L

SO302

AM LOOP
ANTENNA

1
2

1
2

CNP302

1

1

3

3

1

VDD

AM OSC OUT

24

10.7mHz

450kHz

– 17 –

CD-BP1200W/1250W

Figure 17 BLOCK DIAGRAM (3/3)

SPEAKER

SPEAKER

FRONT

SURROUND

SO902
AC INPUT
SOCKET

SW801

VOLTAGE SELECTOR

110V

127V

230-240V

220V

PT801

POWER TRANSFORMER

+5V

REC/PLAY

+B4

KIA704ZAP

RESET

SYS. STOP

RESET

IC704

Q707

SO902
SPEAKER
TERMINAL

+B4

+B4

+B4

SW601

SPAN SELECTOR

+B4

VDD

VDD

VDD

R-OUT
L-OUT

SP. DET.

Q902

Q901

A10V

+B4

+B2

~

IC904

IC902

IC905

MUTE

SYSTEM

Q602

Q601

CEDICL

DO

+B2

XL701

4.1943MHz

~

D911-D914

D907-D910

F901

T2.5A L 250V

~

~~

Vcc

POWER AMP.

LA4282

IC901

BAIS

AVDD

KEY

SW701-SW703
SW709-SW721
SW723-SW725

SECTION

TO CD

AC POWER
SUPPLY CORD
AC 110V/127/220/
230-240V, 50/60Hz

TF801

IC701

IX0337AW

SYSTEM

MICROCOMPUTER

FL DISPLAY

FL701

~~

7

13

10

2

5

11

1

3

333231

71

30

11

10

65

41

2

99

80

33
31

45

7

11

12139

10

1516

17

20

212322

24

100

78

60

59575655545352

5051

49484746 44434241

40

39
38
37
36
35
34

4

21

CD-BP1250W ONLY

JK901

HEADPHONES

Q706

M

TAPE
MOTOR

MOTOR
DRIVER

Q705

Q704

RX701

1

2

3

+B4

LED722

Q702
Q703

SOLENOID

T2 PLAY
T1 PLAY

R. PLAY
F. PLAY

KIA7810AP
VOLTAGE
REGULATOR

KTC2026
SILICON

KIA7805AP
CONSTANT
VOLTAGE REGULATOR

Q701

L

R

3

F902

T1.6A L 250V

+B1

CD-BP1200W/1250W

– 18 –

Figure 18 SCHEMATIC DIAGRAM (1/9)

A

B

C

D

E

F

G

H

1

23456

• NOTES ON SCHEMATIC DIAGRAM can be found on page 14.

42
41
40
39
38
37
36

LOADING M-

VCC4

LD_M+
LD_M-

LOADING M+

35
34
33
32
31
30
29
28
27
26
25
24
23
22

SPDO

VCC3

VCC2(SPN)

SP­SP+
SPO

GND

+B

EFBL

NC

TEST

HFL

TE

TE-

FE

FE-

RFEV

BH

PH

RF

RF-

RFSW

VCC

30

29

28

27
26
25
24
23
22
21
20

19
18
17
16

REF

ODRV

AGCON

ODRV

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

REF

AGCON

ODRV

APC

LPF

DH

PH

LPF

LPF

PH/BH

LDON

EFBL

FIN1

FIN2

REF1

TIN2

TIN1

AGON

LDD

TEST0

GND

VREF

TES1

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

FIN2

FIN1

TIN2

TIN1

+B

+B

2

5

3

1

7
6

4

4
3
2

1

7
6
5

CD SERVO PWB-B

5

1

3

7
6

4

2

4
3
2

1

7
6
5

Vcc

C

Vref

F

B

E
A

LD

VR

PD

GND

FO-

FO+

TR+

TR-

5

2

1
2
3
4
5
6
7
88

3

6
7

1

4

TR­TR+

FO+

FO-

GND

PD
VR
LD

ACTUATOR

FO+

FO­TR-

TR+

1
2
3
4
5
6
7
88

3

6
7

1

4
5

2

PICKUP UNIT

GND(D)

PUIN

SP+

SP-

SL+
SL-

3
2

5

1

4

6

2

3

5

1

4

6

3

6

1

4

5

22

3

5

1

4

6

CD MOTOR PWB-C

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

SLDO

FDO

TDO

MUTE

Vref

STANDBY

VCC1

SL-

SL+

GND

TR+

TR-

FO-

FO+

FO

FD

TO

+B

+B

+

+

+

+

+

+

+

+

+

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

+

+

+B

+B

+B

+B

+

-

-

+

M
M

+

+

+

+

2.7V

3.3V

1.5V

R54 68K

R53 68K

R52 68K

R51 68K

CNP1

R56
68K

R55

68K

C6
100/10

C54

47/10

C55

0.01

C51

47/10

C53

0.001
R25

10K

C7
10/16

C8

0.1

R47

3.3

Q3

KTA1266GR
LASER DRIVER

R50

47

C14

0.33

C13

0.01

R42

120K

R3

100K

R4

10K

C11

0.47/6.3

R6

27K

R7

6.8K
R5

39K

C12

0.1

C18

3P

(CH)

C19

100/10

R8

330

R10
27K

C26

0.047

C22

100P

R80
1M

R

1

.

C24

2.2/50
C

0

C23

0.047

R
6

R

1

1

2

C17

0.0047

R15
10K

C20

0.1

C42
68P

C25

0.1

C41

100/10

C28

47/10

C82

0.022

D93

DS1SS133

R43

220K

C47

100/16

C49

100/16

C50

100/16

C46

0.022

IC3

M63001FP

FOCUS/TRACKING/

SPIN/SLED DRIVER

R48

6.8K

C52

0.01

CNP2

CNP3

CNS3A

CNS3B

M1

SPINDLE

MOTOR

M2

SLED

MOTOR

SW4

PICKUP IN

IC1

LA9235M

SERVO AMP.

CNS1A

CNS1B

CNS2A

CNS2B

CNP3A

13

5

4