Sharp CDBP-1250-W, CDBP-1200-W Service manual

Illustration: CD-BP1200W

CD-BP1200W/1250W

SERVICE MANUAL

No. S6052CDP1200W

MINI COMPONENT SYSTEM

MODEL CD-BP1200W

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

MINI COMPONENT SYSTEM

MODEL CD-BP1250W

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

Illustration: CD-BP1250W

• 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

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

Page

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-BP1200W/1250W

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.

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

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.

Emission Duration: continuous
Laser Output: max. 0.6 mW

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

QACCJ0006AW00

QACCL0002AW00/QACCZ0008AW00

QACCA0004AW00

Figure 2 AC POWER SUPPLY CORD AND PLUG ADAPTOR

QPLGA0003AWZZ QPLGA0004AWZZ

– 2 –

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

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

TO THE OPERATION MANUAL.

CD-BP1200W/1250W

General

CD-BP1200W/1250W

SPECIFICATIONS

Power source:

Power
consumption:

Dimensions:

Weight:

Amplifier section (CD-BP1200W)

Output power:

Output terminals:

Amplifier section (CD-BP1250W)

Output power:

Output terminals:

Compact disc player section

Type:

Signal readout:

D/A converter:
Frequency

response:
Dynamic range:

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

32 W

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

5.0 kg (11.0 lbs.)

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.)

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

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.)

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

(recommended; 32 ohms)

3-disc multi-play compact disc
player

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

1-bit D/A converter
20 - 20,000 Hz

90 dB (1 kHz)

CP-BP1200/1250

GBOXS0043AWM1

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

CD-BP1250W Only

Tuner section

Frequency range:

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

– 3 –

CD-BP1200W/1250W

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

NAMES OF PARTS

1234 5678

11109

12
13

1914

15

20

16

21

17

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
(TAP E) Pl ay Button

18

28
29

24

22

25 26 27

23

30
31

– 4 –

CD-BP1200W/1250W

p

1

9
10
11
12

151413 161718

3
4

5
6

7

19
20
21

23

22

8

2

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 T erminal

7.FM 75 Ohms Aerial Terminal

8.AM Loop Aerial Input Socket

CP-BP1200/1250

1.Full-Range Speaker

2.Bass Reflex Duct

3.Speaker Wire

GBOXS0043AWM1

CD-BP1250W Only

3
4

5

1

6
7

2

1
2

3

8

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

1
2

Common section

19.Equalizer Mode Selector Button

20.Function Selector Buttons

21.On/Stand-by Button

22.Extra Bass Button

23.Volume U

/Down Buttons

– 5 –

CD-BP1200W/1250W

g

PREPARATION FOR USE

OPERATION MANUAL

Connecting the AC po wer lead

Check the setting of the AC voltage selector located on the
rear panel before plugging the unit into an AC sock et. 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).

1

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.

2

To an AC socket

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 Australia and New Zealand:

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

.

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.

– 6 –

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

– 7 –

CD-BP1200W/1250W

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-BP1200W/1250W

STEP REMOVAL

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

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........................

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

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

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

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

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

10 Disc Tray 1.

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

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

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

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

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

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

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

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

arrow direction.

2.

3.

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

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

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.

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.

PROCEDURE

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

(E1) x8 9-2

(G1) x9

Turn fully the lock lever in the

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. ..............

(K1) x6

FIGURE

9-3

8-3

9-1

9-5

(Fig. 9-1)

CD-BP1200W/1250W

Top Cabinet

Front Panel

(B2)x1
ø3x10mm

(A1)x2
ø3x12mm

Side Panel
(Left)

Side Panel
(Right)

(B2)x1
ø3x10mm

(B1)x2
ø3x12mm

(A1)x2
ø3x12mm

Rear
Panel

Figure 8-1

CD Tray Cover

(C2) x3

1

2

CD Player
Unit

(C3)x1

Front Panel

(C3) x1

Pull

Rear
Panel

(C1)x1
ø3x12mm

CD Servo
PWB

(C4)x2

1

Main PWB

(D1)x8
ø3x8mm

Figure 8-2

Lock Lever

CD Player Unit
(Bottom View)

Figure 8-3

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.

– 8 –

Clamp Lever

CD Player Unit
(Top View)

CD-BP1200W/1250W

(J2) x1

Turntable

(E2)x1

(E3)x1

(E2)x1

(E1)x7
ø3x10mm

Main PWB

Figure 9-1

(F1)x3
ø3x8mm

Cam Gear Rib

(E2)x2

Front Panel

(E1)x1
ø3x10mm

Headphones
PWB

(E4)x1

(J1) x2

1

Disc Tray

Loading Chassis

Figure 9-4

(K1) x3

2

Disc Tray

(K1) x3

Loading Chassis

(G1)x9
ø3x10mm

Tape
Mechanism

(H1)x5
ø3x10mm

Figure 9-2

(G2)x1

Display PWB

Figure 9-3

Front Panel

Open

Cassette
Holder

– 9 –

(L3) x2

(L2) x3

(L3) x2

(L1)x1
ø3x8mm

Figure 9-5

CD Servo

PWB

Figure 9-6

Disc Tray

CD-BP1200W/1250W

CD

(M2) x3

Mechanism

(M1) x1

(M1) x1

Disc Tray

Figure 10-1

CP-BP1200/1250

STEP REMOVAL

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

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

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

PROCEDURE

FIGURE

Driver should
be pried away
from Speaker Box.

Screwdriver

(A1)x1

(A2)x1

Figure 10-2

Speaker Box

Speaker

(A3)x4
ø3.5x13mm

Speaker Box

Figure 10-3

– 10 –

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.

Erase Head

(A1)x2
Ø2 x 9mm

Figure 11-1

CD-BP1200W/1250W

TAPE 2

Record/Playback
Head

TAPE 1

Playback
Head

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.

TAPE 2

Motor

(F1) x2

Ø 2.6 x 5mm

TAPE 2

(B1)x1
Ø2x9mm

Pinch Roller
(C1)x1

FF/REW
Belt
(D2)x1

Figure 11-2

Pull

Figure 11-3

(B1)x1
Ø2x5mm

<B>

Motor

Pull

TAPE 2
Main Belt
(D1)x1

<A>

Pinch
Roller
Pawl

Motor

TAPE 1
Main Belt
(E1)x1

– 11 –

(D1)x1
Main Belt

(E1)x1
Main Belt

Figure 11-4Figure 11-5

TAPE 1

FF/REW
Belt
(E2)x1

CD-BP1200W/1250W
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.

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.

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.

Disc Tray

(B1) x2
ø2.6 x6mm

T/T Up/Down Motor

(A1)x2

Figure 12-1

Stop Washer
(B3) x1

(A1)x3

Pulley

Drive Belt
(A2) x1

Motor

ADJUSTMENT

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

Pickup

Shaft
(B2) x1

Gear

CD Mechanism

(B4) x1

Figure 12-2

• Tape Speed

Test Tape

Normal MTT-111 Variable
speed Resistor in terminal

Adjusting

Point

motor. (Load

TAPE MECHANISM

Specified

Value

3,000±30 Hz

Motor

Instrument

Connection

Speaker

resistance:
6 ohms)

– 12 –

Variable Resistor
in motor

Figure 12-3

CD-BP1200W/1250W

TUNER SECTION

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

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage 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

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

Frequency

Display

Setting/

Adjusting

Parts

SO302

FM TERMINAL

FM BAND
COVERAGE fL

TP301

Instrument

Connection

CNP302

AM LOOP

ANTENNA

IC301

R381

T301

T351

• FM RF

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

Test Stage

Frequency

Frequency

Display

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)

Setting/

Adjusting

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

MAIN PWB

L312

FM RF

T303

AM BAND
COVERAGE fL

AM
TRACKING fL

T306

1

T302

FM IF

Instrument

Connection

Point

Figure 13-1 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 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

AM IF

TP302

R357

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

[Servo System Error]

[Error during close operation]

[Error during open operation]

[Error during skip operation]

or Disc SW do not change to low.

T

T

1

3

Stopped

FDO

TE

CH1=500mV

DC 10:1

CH2=200mV

DC 10:1

CH3=1V

DC 10:1

1999/04/05 20:26:47

500ms/div

(500ms/div)

NORM:20kS/s

– 13 –

EFBL

2

Smoothing : ON CH1 : 0.000V
BW : FULL

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

Figure 13-2

=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

CD-BP1200W/1250W

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
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

50/9kHz-100/10kHz

• 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.

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

/

FRONT

VIEW

E C B

(S) (G) (D)
(1) (2) (3)

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

Figure 14 TYPES OF TRANSISTOR AND LED

– 14 –

4204SRT7

FRONT
VIEW

TO MAIN SECTION

(TO IC601)

TO DISPLAY SECTION

CD-BP1200W/1250W

SW3

SW2

DISC

CLAMP

3

NUMBER

+

5

4

M

6

UP/DOWN

MOTOR

-

SW1
OPEN/
CLOSE

12

M3
T/T

BI4

XL1

16.9344MHz

R-CH

L-CH

AGND

DGND

2

1

75

65

CE
CL

66
67
68
69
70
71
72

52

51

CONT6

DI
DO
INT
WRQ
RES
DEF
XOUT

XIN

VDD5V

VVDD

735183644 49 50 7 14 15 16

45 46

76

CONT7

LC78641E

SERVO/SIGNAL

CONTROL

ADAVDD

VDD

LVDD

LCHO

IC2

RVDD

5

3

4

47 48 32 31

LVSS

RVSS

RCHO

HFL

XVDD

+5V(+B3)

CNP11

Q2

CONT4

FE

RFEV

30

CONT2

CONT3

CONT5

SLD0
SPD0

FD0
TD0

TE

CDINT

CE

DO

DI

DRF

WRQ

217

74
64
40
19
13

3

33

26
25
24
23

5

43

SW4

PICKUP IN

6

CLK

89

CD RES

CLAMP SW

GND

10

CNP12

12

12

56

3

4

56

3

4

CNS4

CNP4

CONSTANT

VOLTAGE

+3.3V

PICKUP UNIT

+5V

Q1

+5V

30

23
11

9

FIN1

12

+3.3V

FIN2

18 19 20

17

TE

HFL

IC1

LA9235M

SERVO AMP.

PD

TIN2

TIN1

34

7

TE-

8

LDD

1

2 1725 4142 3839

22

21

VCC1

+5V

18

VCC4

40
24

VCC2

FOCUS/TRACKING/

23

SPIN/SLED DRIVER

VCC3

28

45671516 26 27

M

M

IC3

M63001FP

FE

FE-

RFEV

LASER

DRIVER

+3.3V

Q3

M2

SLED

MOTOR

M1

SPINDLE

MOTOR

FOCUS COIL

TRACKING COIL

35

29
22
21
14

8

Figure 15 BLOCK DIAGRAM (1/3)

– 15 –

CD-BP1200W/1250W

FM ANTENNA

TERMINAL

SO302

AM LOOP
ANTENNA

1
2

1

CNP302

1
2

BF301

3

T303

1

FM FRONT END

3

FM

L312

RF

AM

TRACKING

IC301

TA7358AP

4

5

T306

8

7

FM

OSC

T301

Q302

AM BAND

COVERAGE

6

9

FM +B

T302

SWITCHING

FM OSC

VT

Q360

1

CF303

20

4.5MHZ

1

PLL(TUNER)

FM

3

23

AM OSC IN

X352

IC302

LC72131

22

450kHz

1

T351

21

AM MIX

IC303

LA1832S

FM IFDET/

FM MPX. /AM IF

24

21

AM RF IN

AM OSC OUT

15

16

FM/AM

7

9

3

CF352

4

AM IF

7

STEREO

11

MO/ST

10

5

GND

FM/AM

CE

3

OUT

18

FM+B

DI

4

21

10.7mHz

CF351

9

CLK

5

8

FM

DET

16

VDD

+B2

X351
456kHz

13

1 7

MO/ST

VCO

L

14

R

15

FM/AMMPX IN

12

DO

6

17

PLAYBACK

HEAD

TAPE 1

REC

PLAYBACK

HEAD

TAPE 2

L-CH

R-CH

L-CH
R-CH

FROM CD

SECTION

CNP11

REC

P.B.

AC BIAS

SWITCHING

Q104~

Q107

CNS602

1
2
3
4
5

REDUCE

SWITCHING

Q108
Q109

R

L

IC101

AN7345K

PLAYBACK AND RECORD/

PLAYBACK AMP.

L(T1)

1

R(T1)

24

L(T2)

2

R(T2)

23

L NF

3

R NF

22

POP

T1/T2

6

L REC

9

REF

16
14

12

REC

NOR/

R REC

15

SWITCHING

Q103

P.B

13

21

+B2

L

10

TAPE

R

15

AUDIO PROCESSOR

L

11

TUNER

R

14

L

12

CD

R

13

7

8

+B2

L

4

PB

R

IC601

LC75341

18

17

+B2

23

3

CLK

MUTING

Q110
Q111

DI

1

CE

2

24
21

R
L

4

SYSTEM

MUTE

Q601
Q602

REC/PLAY

5

20

H/N

RECRL

7

18

L NF

8

R NF

17

ALC

10

T1/T2 HIGH

19

ERASE

HEAD

BIAS
OSC

Q114

L104

Q101

SWITCHING

Q102

SWITCHING

Q112
L103

BIAS

Q113

Figure 16 BLOCK DIAGRAM (2/3)

– 16 –

BAIS

+B2

SW601

SPAN SELECTOR

CD-BP1200W/1250W

R. PLAY
F. PLAY

Q702
Q703

212322

T2 PLAY
T1 PLAY

SYS. STOP

AVDD

CEDICL

SOLENOID

LED722

40

39
38
37
36
35
34
33

~

31

DO

24

+B4

MOTOR
DRIVER

Q706

Q705

Q704

1

RX701

TAPE
MOTOR

M

3

+B4

2

KEY
SW701-SW703
SW709-SW721
SW723-SW725

FL701

FL DISPLAY

~~

11

30

21

10

4

60

59575655545352

71

333231

5051

49484746 44434241

+B4

45

VDD

78

IC701

IX0337AW

SYSTEM

MICROCOMPUTER

RESET

~

11

10

12139

1516

VDD

17

20

~

Q701

80

~~

99

100

VDD

41

65

7

SYSTEM

MUTE

Q601
Q602

REC/PLAY

+B2

SP. DET.

A10V

+B4

Q901
Q902

IC901

R

5

LA4282
POWER AMP.

L

2

KTC2026
SILICON

IC905

IC902

KIA7810AP
VOLTAGE
REGULATOR

Vcc

10

+B1

3

7

11

13

D907-D910

D911-D914

R-OUT
L-OUT

XL701

4.1943MHz

Q707

F901

T2.5A L 250V

F902

T1.6A L 250V

+B4

IC704

3

KIA704ZAP

RESET

PT801

POWER TRANSFORMER

TO CD

SECTION

1

+B4

2

SW801

VOLTAGE SELECTOR

220V

230-240V

127V
110V

JK901

HEADPHONES

SO902

SPEAKER

TERMINAL

FRONT
SPEAKER

SURROUND
SPEAKER

CD-BP1250W ONLY

SO902
AC INPUT
SOCKET

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

BAIS

+B4

+5V

IC904

KIA7805AP
CONSTANT
VOLTAGE REGULATOR

Figure 17 BLOCK DIAGRAM (3/3)

– 17 –

TF801

CD-BP1200W/1250W

R

.

0

R
6

1

2

A

CD SERVO PWB-B

C54

47/10

R55

68K

+B

TIN1
FIN1
FIN2
TIN2

C55

0.01

C7
10/16

R25
10K

+B

R50

47

C23

0.047

IC1

LA9235M

FIN1

FIN2

TIN1

TIN2

C6
100/10

REF1
VREF

C8

0.1
LDD
GND
LDON

AGON
EFBL

TEST0

TES1

SERVO AMP.

REF

AGCON

PH/BH

30

ODRV

29

28

REF

PH

27
26
25

DH

24
23
22

REF

21

LPF

20

REF

LPF

19

REF

18
17
16

1

REF

2

REF

3

REF

4

REF

5

REF

6
7

APC

8
9

10

ODRV

11

AGCON

12
13
14
15

ODRV

REF

REF

REF
REF

LPF

REF

VCC

RFSW

120K

RF-

RF
NC

PH
BH

RFEV
FE­FE
TE­TE
HFL

TEST

C11

0.47/6.3

C12

0.1

R42

100K

10K

C18

R7

3P

6.8K
(CH)

R6

R5

27K

39K

5

C13

0.01

C14

0.33

R3

R4

C19

100/10

R10
27K

C20

0.1
R8

330

C17

0.0047

C42
68P

C82

0.022

4

D93

DS1SS133

C25

0.1

C41

100/10

C24

2.2/50

C22

100P

R15
10K

R43

220K

1

C

R
1

R80
1M

C26

0.047

C28

47/10

EFBL

CNS1A

CNS1B

Vcc

7

7

7

Vref

6

E

B

5

A

4

B

3

F

2

C

1

7

6

6

6
5
4
3
2

1

R51 68K

5

5

R52 68K

4

4

R53 68K

3

3

R54 68K

2

2

1

1

CNP1

R56
68K

C

+B

C51

C53

47/10

0.001

2.7V

R47

3.3

D

1.5V

Q3

KTA1266GR
LASER DRIVER

3.3V

E

F

ACTUATOR

PICKUP UNIT

G

CD MOTOR PWB-C

SPINDLE

MOTOR

SLED

MOTOR

SW4

PICKUP IN

H

13

C52

0.01

+B

TDO

TR+
FO+

FO­TR-

M1

M2

TR­TR+

FO+
FO­GND

+

M

­+

M

-

VR
LD

CNP3A

1

1

2

2

3

3

4

4

5

5

6

6

PD

7

7

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

100/16

SP-

6

SP+

5

SL+

4

SL-

3

PUIN

2

GND(D)

1

CNP3

+B

TO

FDO

FD
FO

C46

0.022

FO+

FO-

TR+

TR-

GND

SL-

SL+
SLDO
VCC1

STANDBY

Vref

MUTE

C50

C49

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 14.

1

23456

Figure 18 SCHEMATIC DIAGRAM (1/9)

– 18 –