Sharp CDBK-250-W Service manual

CD-BK250W/CD-BK2600W/CD-BK270W

SERVICE MANUAL

No. S5136CDBK250W

MINI COMPONENT SYSTEM

MODEL CD-BK250W

CD-BK250W Mini Component System consisting of
CD-BK250W (main unit) and CP-BK250 (speaker system).

Illustration: CD-BK250W/CD-BK2600W

MINI COMPONENT SYSTEM

MODEL CD-BK2600W

CD-BK2600W Mini Component System consisting of
CD-BK2600W (main unit) and CP-BK2600 (speaker system).

MINI COMPONENT SYSTEM

MODEL CD-BK270W

Illustration: CD-BK270W

CONTENTS

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

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

AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................. 2

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

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

OPERATION MANUAL ...................................................................................................................................................... 7

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

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

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

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

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

VOLTAGE ........................................................................................................................................................................ 38

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 39

TYPES OF TRANSISTOR AND LED............................................................................................................................... 39

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 40

TROUBLESHOOTING..................................................................................................................................................... 41

FUNCTION TABLE OF IC................................................................................................................................................ 45

FL DISPLAY..................................................................................................................................................................... 53

REPLACEMENT PARTS LIST/EXPLODED VIEW

CD-BK270W Mini Component System consisting of
CD-BK270W (main unit), CP-BK270 (front speakers) and
GBOXS0070AWM1 (surround speakers).

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

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-BK250W/CD-BK2600W/CD-BK270W

SAFETY PRECAUTION FOR SERVICE MANUAL

WARNINGS

THE AEL (ACCESSIBLE EMISSION LEVEL) OF THE LASER POWER OUTPUT IS LESS THAN CLASS 1 BUT THE LASER
COMPONENT IS CAPABLE OF EMITTING RADIATION EXCEEDING THE LIMIT FOR CLASS 1. THEREFORE IT IS
IMPORTANT THAT THE FOLLOWING PRECAUTIONS ARE OBSERVED DURING SERVICING TO PROTECT YOUR EYES
AGAINST EXPOSURE TO THE LASER BEAM.

1-WHEN THE CABINET IS REMOVED, THE POWER IS TURNED ON WITHOUT A COMPACT DISC IN POSITION AND THE

PICKUP IS ON THE OUTER EDGE 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 UNIT AND REPLACEMENT SERVICE PARTS ARE ALL FACTORY

PRESET BEFORE SHIPMENT.

DO NOT ATTEMPT TO READJUST THE LASER PICKUP UNIT DURING REPLACEMENT OR SERVICING.
3-UNDER NO CIRCUMSTANCES STARE INTO THE PICKUP LENS AT ANY TIME.
4-CAUTION-USE OF CONTROLS OR ADJUSTMENTS, OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE

SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.

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.

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 (110 V, 127 V, 220 V or 230 V-240 V AC).

AC POWER SUPPLY CORD AND AC PLUG ADAPTOR

QACCA0003AW00

QACCE0010AW00

QACCL0005AW00

QPLGA0003AWZZ QPLGA0004AWZZ

QACCJ0007AW00

– 2 –

CD-BK250W/CD-BK2600W

General

Amplifier

CD player

Tuner

Cassette deck

Power source

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

Power consumption

130 W

Dimensions

Width: 270 mm (10-11/16")
Height: 330 mm (13")
Depth: 340 mm (13-3/8")

Weight

7.4 kg (16.1 lbs.)

Output power

Front speakers:
MPO: 160 W (80 W + 80 W) (10 % T.H.D.)
RMS: 100 W (50 W + 50 W) (10 % T.H.D.)
RMS: 70 W (35 W + 35 W) (0.9 % T.H.D.)
Surround speakers:
MPO: 80 W (40 W + 40 W) (10 % T.H.D.)
RMS: 50 W (25 W + 25 W) (10 % T.H.D.)
RMS: 34 W (17 W + 17 W) (0.9 % T.H.D.)

Output terminals

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

Input terminals

Video/Auxiliary (audio signal): 500 mV/47 kohms
Microphone: 1 mV/600 ohms

Type

3-disc multi-play compact disc player

Signal readout

Non-contact, 3-beam semiconductor 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

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

2-way type speaker system
5 cm (2") Tweeter
13 cm (5-1/4") Woofer

Maximum input power

100 W

Rated input power

50 W

Impedance

8 ohms

Dimensions

Width: 220 mm (8-11/16")
Height: 330 mm (13")
Depth: 217 mm (8-9/16")

Weight

3.0 kg (6.6 lbs.)/each

Type

10 cm (4") full-range speaker

Maximum input power

50 W

Rated input power

25 W

Impedance

16 ohms

Dimensions

Width: 200 mm (7-7/8")
Height: 93 mm (3-11/16")
Depth: 170 mm (6-3/4")

Weight

0.5 kg (1.1 lbs.)/each

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

Tuner

Frequency range

Cassette deck

Frequency response
Signal/noise ratio

Wow and flutter

CP-BK250/CP-BK2600

Type

Maximum input power
Rated input power
Impedance
Dimensions

Weight

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

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

AC 110/127/220/230 - 240 V, 50/60 Hz
130 W
Width: 270 mm (10-11/16")

Height: 330 mm (13")
Depth: 340 mm (13-3/8")

7.2 kg (15.7 lbs.)

MPO: 240 W (120 W + 120 W) (10 % T.H.D.)
RMS: 150 W (75 W + 75 W) (10 % T.H.D.)
RMS: 104 W (52 W + 52 W) (0.9 % T.H.D.)
Speakers: 6 ohms
Headphones: 16 - 50 ohms (recommended: 32 ohms)
Video/Auxiliary (audio signal): 500 mV/47 kohms
Microphone: 1 mV/600 ohms

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)

FM: 88 - 108 MHz
AM: 531 - 1,602 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
5 cm (2") Tweeter
13 cm (5-1/4") Woofer
150 W
75 W
6 ohms
Width: 220 mm (8-11/16")

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

3.0 kg (6.6 lbs.)/each

CD-BK250W/CD-BK2600W/CD-BK270W

SPECIFICATIONS

CD-BK270W

CP-BK270

GBOXS0070AWM1

– 3 –

CD-BK250W/CD-BK2600W/CD-BK270W

NAMES OF PARTS

Front panel

CD-BK250W/CD-BK2600W/CD-BK270W

1. Disc Tray

2. Timer Set Indicator

3. On/Stand-by Button

4. Tape 2 Cassette Compartment

5. Tape 1 Cassette Compartment

6. Equalizer Mode Select Button

7. Volume Up and 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. Tape 2 Reverse Play 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 Socket

21. CD or Tape Stop Button

22. CD Play, Tape 1 Play or Tape 2 Forward Play Button

23. Tape 2 Reverse Mode Select Button

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

25. Tuning and Time Down Button

26. Memory/Set Button

27. Tape 2 Record Pause Button

28. CD Track Down or Fast Reverse, Tape 2 Fast Wind,
Tuner Preset Down Button

29. Microphone Level Control

30. Microphone Socket

1
2

3

17
18

19
20

6

8

7

9
10

4
5

161514131211

21
22
23
24

Display

CD-BK250W/CD-BK2600W/CD-BK270W

1. Extra Bass Indicator

2. FM Stereo Mode Indicator

3. FM Stereo Receiving Indicator

4. Karaoke Mode Indicator

5. CD Repeat Play Indicator

6. CD Pause Indicator

7. CD Play Indicator

8. Tape 2 Record Indicator

9. Tape Reverse Mode Indicator

10. Disc Number Indicators

11. Timer Play Indicator

12. Memory Indicator

13. Tape 2 Reverse Play Indicator

14. Tape 1 Play or Tape 2 Forward Play Indicator

15. Sleep Indicator

16. Timer Recording Indicator

17. Spectrum Analyser/Volume Level Indicator

1
2

34 5 6

17 17

25 26 27

7

17

29 3028

8
9

13 14 15 16

10
11

12

– 4 –

Rear panel

CD-BK250W/CD-BK2600W

1. FM 75 Ohms Aerial Terminal

2. FM Aerial Earth Terminal

3. AM Loop Aerial Socket

4. Span Selector Switch

5. Video/Auxiliary (Audio Signal) Input Sockets

6. Speaker Terminals

7. AC Power Lead

8. AC Voltage Selector

CD-BK250W/CD-BK2600W/CD-BK270W

1
2
3
4
5
6

CD-BK270W

1. Surround Speaker Terminals

2. FM 75 Ohms Aerial Terminal

3. FM Aerial Earth Terminal

4. AM Loop Aerial Socket

5. Span Selector Switch

6. Video/Auxiliary (Audio Signal) Input Sockets

7. Front Speaker Terminals

8. AC Power Lead

9. AC Voltage Selector

8

7

1
2
3
4
5
6

7

9

8

Speaker system

CP-BK250/CP-BK2600

1. Tweeter

2. Woofer

3. Bass Reflex Duct

4. Speaker Wire

– 5 –

1

2

3

3

4

CD-BK250W/CD-BK2600W/CD-BK270W

Front speaker

CP-BK270

1. Tweeter

2. Woofer

3. Bass Reflex Duct

4. Speaker Wire

Surround speaker (CD-BK270W Only)

GBOXS0070AWM1

1. Full-Range Speaker

2. Speaker Wire

1

2

3

3

4

1

2

Remote control

CD-BK250W/CD-BK2600W/CD-BK270W

1. Remote Control Transmitter

2. Echo Level Up and Down Buttons

3. Karaoke Mode Button

4. Disc Number Select Buttons

5. CD Clear Button

6. Tape 2 Record Pause Button

7. CD Track Down or Fast Reverse, Tape 2 Fast Wind,

Tuner Preset Down Button

8. Equalizer Mode Select Button

9. Tape 2 Reverse Play Button

10. CD Button

11. Tuner (Band) Button

12. On/Stand-by Button

13. Extra Bass Button

14. CD Random Button

15. CD Memory Button

16. CD Pause Button

17. CD Track Up or Fast Forward, Tape 2 Fast Wind,

Tuner Preset Up Button

18. CD or Tape Stop Button

19. CD Play or Repeat, Tape 1 Play,

Tape 2 Forward Play Button

20. Video/Auxiliary Button

21. Tape (1 2) Button

22. Volume Up and Down Buttons

10
11
12

13

1

2
3

14

4

15

5
6

16
17

18
7
8
9

19

20
21

22

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.

– 6 –

OPERATION MANUAL

Setting the Clock

In this example, the clock is set for the 24-hour (0:00) 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 24-hour or 12­hour display and then press the MEMORY/SET button.

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

"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)
Note that this can only be set when the unit is first installed or it has been reset.

[Refer to "Clearing all the memory (reset)".]

(0:00 - 23:59)

CD-BK250W/CD-BK2600W/CD-BK270W

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.
Hold it 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.

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

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

1 Clear all the programmed contents. [Refer to "Clearing all the memory (reset)".]
2 Perform "Setting the Clock" from the beginning.

System Connections

Setting the AC voltage selector

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.

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).

Connecting the AC power lead

After making all connections, plug the unit. If you plug the unit first,
the unit will enter the demonstration mode.

Note:

Unplug the AC power lead from the AC socket if the unit will not be in use for a pro­longed period of time.

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 ).

1

2

Setting the FM/AM span selector

The International Telecommunication Union (ITU) has established that member coun­tries should maintain either a 100 kHz or a 50 kHz interval between broadcasting fre­quencies of FM stations and 10 kHz or 9 kHz for AM station. The illustration shows
the 50/9 kHz zones (regions 1 and 3), and the 100/10 kHz zone (region 2).
Before using the unit, set the SPAN SELECTOR switch (on the rear panel) to the
interval (span) of your area.

To change the tuning zone:

1 Press the ON/STAND-BY button to enter the stand-by mode.
2 Set the SPAN SELECTOR switch (on the rear panel) as follows.

For 50 kHz FM interval (9 kHz in AM) 50/9
For 100 kHz FM interval (10 kHz in AM) 100/10

3 Whilst 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 programme.

– 7 –

CD-BK250W/CD-BK2600W/CD-BK270W

y

Troubleshooting Chart

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

General

The clock is not on time. Did a power failure occur? Reset the

When a button is pressed, the unit
does not respond.

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

Symptom Possible cause

clock.
Set this unit to the power stand-by mode

and then turn it back on.
If the unit still malfunctions, reset it.

Are the headphones connected?
Are the speaker wires disconnected?
Is the karaoke mode set to "L-CH", "R-CH"

or "V-CANCEL"?

CD player

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.

Symptom Possible cause

Does the disc satisfy the standards?
Is the disc distorted or scratched?
Is the unit located near excessive vibra-

tions?
Is the disc very dirty?
Has condensation formed inside the unit?

Tuner

Radio makes unusual noise con­secutively.

Symptom Possible cause

Is the unit placed near the TV or comput­er?

Is the FM aerial or AM loop aerial placed
properly? Move the AC power lead away
from the aerial if located near.

Cassette deck

Symptom Possible cause

Cannot record. Is the erase-prevention 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,

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

Is the tape stretched?

dirty?

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

Karaoke

Symptom Possible cause

The vocal part of a multiplexed
disc is not heard.

Is the karaoke mode set to "L-CH", "R-CH"
or "V-CANCEL"?

Remote control

Symptom Possible cause

The remote control does not oper­ate.

Is the AC power lead 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?

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 the previous operation, unplug and plug in the unit,

and then turn the power on.

Note:

If neither operation above restores the unit, clear all the memory by resetting it.

Clearing all the memory (reset)

1 Press the ON/STAND-BY button to enter the power stand-by mode.
2 Whilst 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 programme.

Before transporting the unit

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

Remove all CDs inserted in the unit.

4 Press the OPE N/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 lead from the AC socket.

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

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

Notes concerning use:

Replace the batteries if the operating distance is reduced or if the operation
becomes erratic. Purchase 2 "AA" size batteries (UM/SUM-3, R6, HP-7 or similar).
Periodically clean the transmitter on the remote control and the sensor on the unit
with a soft cloth.
Exposing the sensor on the unit to strong light may interfere with operation.
Change the lighting or the direction of the unit.
Keep the remote control awa

from moisture, heat, shock, and vibrations.

– 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

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-BK250W/CD-BK2600W/CD-BK270W

STEP

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

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

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

4 Rear Panel with 1. Screw .................... (D1) x11 9-2

5 Main PWB 1. Screw ...................... (E1) x3

6 Front Panel 1. Screw .......................(F1) x2 10-3

7 Display PWB 1. Knob........................ (G1) x1 10-4

8 Tape Mechanism 1. Open the cassette holder. .. 10-4

9

10 Mic PWB 1. Screw ...................... (K1) x2 10-4

11 Turntable 1. Hook......................... (L1) x2 10-5

12 Disc Tray 1.

13 CD Servo PWB 1. Screw ...................... (N1) x1 11-1

14 CD Mechanism 1. Hook........................ (P1) x2 11-2

REMOVAL

(Left/Right)

CD Tray Cover open the disc tray, take out

Fan Motor

Headphones PWB

(Note 2) 2. Hook........................ (N2) x2

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

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

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

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

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

1. Screw .................... (D1) x14

(For CD-BK270W)

2. Socket ..................... (D2) x1

2. Socket ..................... (D2) x2

(For CD-BK270W)

2. Socket ..................... (E2) x4 10-3

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

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

2. Screw ....................(G2) x12

3. Flat Cable ............... (G3) x1

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

1. Screw .......................(J1) x1 10-4

2. Tip ........................... (K2) x1

(CD-BK270W Only)

2. Cover ....................... (L2) x1

2.

3.

3. Socket ..................... (N3) x4

2. Hook........................ (P2) x3

PROCEDURE

(For CD-BK250W/CD-BK2600W)

(For CD-BK250W/CD-BK2600W)

Turn fully the lock lever in the
arrow direction
While holding the lock lever,rotate
the cam gear until the cam gear
rib engages with the clamp lever.

Push the slide chassis backward
to engage the claw with the
groove and remove it in the
direction of the arrow..(M1) x6

.

CD-BK250W/CD-BK2600W/CD-BK270W

DISASSEMBLY

Note 1: How to open the changer manually. (Fig. 10-1)

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

2.

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

cam gear rib engages with the clamp lever.

3. After that, push forward the slide chassis.

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 so as to protect the optical pickup from electro­static damage.

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.

CD-BK250W/CD-BK2600W/CD-BK270W

FIGURE

9-2,10-3

10-1
10-2

10-6

Illustration: CD-BK270W

(C3)x1

Pull

(D2)x1

(D2)x1

CD-BK270W
ONLY

(C1)x1
ø3x10mm

Rear
Panel

(D1)x3
ø3x10mm

CD-BK270W
ONLY

– 9 –

CD Servo
PWB

(D1)x9
ø3x10mm

Figure 9-1

(C4)x2

Main PWB

Figure 9-2

(Fig. 10-2)

1

Pull

(D1)x2
ø3x10mm

CD Tray Cover

(C2)x3

1

2

CD Player
Unit

(C3)x1

(E1)x1
ø3x10mm

Lug Wire

CD-BK250W/CD-BK2600W/CD-BK270W

Figure 10-1

Lock Lever

CD Player Unit
(Bottom View)

Clamp Lever

Display
PWB

(G2)x12
ø3x10mm

Tape
Mechanism

Lug Wire

(H1)x5
ø3x10mm

(J1)x1
ø3x10mm

Headphones
PWB

(G3)x1

Lug Wire

Figure 10-4

(L2)x1

(G1)x1

(K1)x2
ø3x10mm

CD-BK270W
ONLY

(K2)x1

Mic PWB

Front
Panel

Open

Cassette
Holder

(E2)x1

Power PWB

(E3)x1

Transformer
PWB

(E2)x1

(E1)x2

ø3x10mm

(E2)x1

Figure 10-2

(E2)x1

CD Player Unit
(Top View)

Cam Gear Rib

(E4)x1

Headphones
PWB

Front
Panel

Turntable

Slide
Chassis

(L1)x2

CD Player Unit

Figure 10-5

(M1)x3

3

2

Main PWB

Figure 10-3

Mic PWB

(F1)x2

ø3x8mm

1

(M1)x3

Figure 10-6

– 10 –

CD-BK250W/CD-BK2600W/CD-BK270W

(N2)x2

(N3)x2

(N1)x1
ø3x8mm

(N3)x2

CD Servo

PWB

Figure 11-1

Slide
Chassis

CD
Mechanism

(P1)x1

(P2)x3

(P1)x1

Slide
Chassis

Figure 11-2

CP-BK250/CP-BK2600/CP-BK270

STEP

Front Panel

REMOVAL PROCEDURE

1 Front Panel 1. Net.......................... (A1) x1 11-3

2 Woofer 1. Screw ..................... (B1) x4 11-4

3 Tweeter 1. Screw ..................... (C1) x2 11-4

(A1)x1

Screwdriver

Driver should
be pried away

Speaker Box

from Speaker Box.

Figure 11-3

FIGURE

(C1)x2

ø3x10mm

Tweeter

(B1)x4

ø4x12mm

Woofer

Figure 11-4

– 11 –

CD-BK250W/CD-BK2600W/CD-BK270W

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.

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.

Erase Head

(A1)x2
Ø2x6mm

Figure 12-1

TAPE 2

TAPE 1

Clutch Ass'y

Record/Playback
Head

Clutch Ass'y

Playback
Head

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.

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

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

Motor

Clutch Ass'y

TAPE 2

(B1)x1
Ø2x9mm

Pinch Roller
(C1)x1

FF/REW
Belt
(D2)x1

(B1)x1
Ø2x5mm

Figure 12-2

Pull

<B>

Figure 12-3

Motor

Pull

Pinch
Roller
Pawl

<A>

TAPE 2
Main Belt
(D1)x1

Motor

TAPE 1
Main Belt
(E1)x1

(F1)x2

Ø2.6x5mm

– 12 –

Main Belt
(D1)x1

Main Belt
(E1)x1

Figure 12-4Figure 12-5

TAPE 1

FF/REW
Belt
(E2)x1

CD-BK250W/CD-BK2600W/CD-BK270W

CD MECHANISM SECTION

Perform steps 1, 2, 3, 11,12, 13 and 14 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) x 1 pc.

2. Remove the screws (B3) x 2 pcs., to remove the shaft
(B4) x 1 pc.

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.

Slide
Chassis

(B3)x2
ø2.6x6mm

Loading Motor

(A1)x2

Figure 13-1

Stop Washer
(B1)x1

Pulley

Drive Belt
(A2)x1

Loading
Motor PWB

(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

Pickup

Shaft
(B4)x1

Gear

CD Mechanism

(B2)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

TAPE MECHANISM

Instrument

Connection

resistance:
6 ohms)

– 13 –

Tape
Motor

Variable Resistor in motor

Figure 13-3

CD-BK250W/CD-BK2600W/CD-BK270W
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 1,602 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 Frequency

Display

Setting/

Adjusting

Parts

FM BAND
COVERAGE fL

SO302

FM ANTENNA

TERMINAL

Instrument

Connection

T301

T351

• FM RF

Signal generator: 1 kHz, 40 kHz dev., FM modulated

Test Stage

FM Band — 87.50 MHz T301(fL): *1
Coverage 1.3 V ± 0.1 V

FM RF 98.00 MHz 98.00 MHz L312 *2

Frequency Frequency

Display

(10-30 dB)

Adjusting

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

CNP301

IC301

AM LOOP
ANTENNA

T302

FM IF

L312

FM RF

T303

AM BAND
COVERAGE fL

MAIN PWB

AM
TRACKING fL

R316

TP301

T306

Setting/

Point

Instrument

Connection

AM IF

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)

CH1=500 mV

DC 10:1

FDO

TE

T

CH2=200 mV

DC 10:1

T

1

3

Stopped

State Code

CH3=1 V

DC 10:1

1999/04/05 20:26:47

500 ms/div

(500 ms/div)

NORM:20 kS/s

– 14 –

EFBL

2

Smoothing : ON CH1 : 0.000 V
BW : FULL

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

Figure 14-2

=Record Length=

Main : 100K
Zoom : 2k

CH2
v/DIV
200 mV

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

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-BK250W/CD-BK2600W/CD-BK270W

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.

XX: Hex value

STOP

<<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-BK250W/CD-BK2600W/CD-BK270W

Standard Specification of Stereo System Error Message Display 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

CD-BK250W/CD-BK2600W/CD-BK270W

SW3

SW2

DISC

CLAMP

SW1

OPEN/

CLOSE

NUMBER

T/T UP DOWN

M

M3

LOADING

XL1

33.8688MHz

+3.3V

316452

316452

OC. DISC NO

CLAMP SW

CD RES

CLK

DI

DO

CE

DRF

+5(+B5)

+5(+B5)

AGND

DGND

L-CH

R-CH

CNP7

61

CE

62

CLK

63

DI

64

DO

65

WRQ

66

RES

615432

42

LCHO

LC78645E

CD SERVO

XOUT

48

XIN

49

VVDD

XVDD

RFVDD

5

ADAVDD

7

18

LVDD

46

41

47

WRQ

4543 44 25 70

LVSS

RVSS

RCHO

IC1

RVDD

FIN2

FIN1

54

3271689

Q3

71

CONT2

CONT3

CONT4

CONT5

SLDO

SPDO

LDD

LDS

TIN2

TIN1

80

79

987

10

FD0
TD0

CNP8

75
69
57
56
55
51
50
40

37
28
19

26

23
22
21
20

+5V

316452

17 25

12

18

VCC1

40

VCC4

FOCUS/TRACKING/

24

VCC2

23

VCC3

SPIN/SLED

BI4

CNS4

CNP4

41 8339

IC2

M63001FP

DRIVER

42

35

29
22

21

14

8

+3.3V

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

SW4

PICKUP

IN

Figure 17 BLOCK DIAGRAM (1/3)

– 17 –

CD-BK250W/CD-BK2600W/CD-BK270W

4

5

8

M

C

FM

ANTENNA

JK1

MIC

VRK1

MIC

VOLUME

MIC IN

ICK1

M65856SP

MIC AMP.

LATCH

CLK

DATA
LOUT

9

ROUT

L IN

12

R IN

13
22

VCC

+B5

QK1

40

41
42

36
35
31

32

23

AM

ANTENNA

5
6

2
3

KIA4558P

OPE AMP.

SO302

CNP301

1
2

+B4

8

ICK2

FM FRONT END

BF301
B.P.F

AM TRACKING

T303 T306

L

7
1

R

IC301

TA7358AP

1

432

5

7

FM

L312 T301

RF

FM

AM BAND
COVERAGE

IC302

LC72131

PLL(TUNER)

SWITCHING

JK690

VIDEO/AUX IN

R

AUX

L

CNP7

FROM CD SECTION

8

OSC

OSC

Q302

6
9

FM

+B

FM

CNS601

FM IF

OSC BUFF

CF303T302

VT

20 22 11

+B4

FM

Q360

1
2
3

X352

4.5 MHZ

OSC

TUNER

450kHz

T351

CF352

AM IF

21

AM MIX

21

AM OSC IN

AM RF IN

1615

9

7

L

R

L

TAPE

R

L

R

L

CD

R

10.7 MHz
X351

CF351

456 kHz

FM+B

13

FM

DET

VCO

14

L

MO/ST

R

15

FM/AM

MPXIN

12

1623

4

AM IF

18

7

98517

GND

FM/AM

OUT

IC303

LA1832S

STEREO

FM IF DET.

FM MPX./

AM IF MPX.

CLK

DO

DI

CE

6

5413

MO/ST

FM/AM

10

9
16
10
15
11
14

AUDIO PROCESSOR

12
13

LR
7

17

21

23

IC601

LC75341

18 178

3

+B4

CE

CLK

1

DI

2

24
21

4

R
L

–20 dB

ATT

+B

Q601
Q602

L-CH

TAPE 1

TAPE 2

R-CH

L-CH
R-CH

ERASE

HEAD

P.B. HEAD

REC PB HEAD

REC

P.B.

AC BIAS

SWITCHING
Q103­Q104

Q105
Q106

BIAS

Q111

L103

OSC

L(T1)

1

24

R(T1)
L(T2)

2

23

R(T2)
L NF

3

R NF

22

6
9

16
14

REF

12

SWITCHING

Q112
SWITCHING

T1/T2
REC

NOR/
HIGH

15

POP REDUCE

L REC
R REC

SWITCHING

Q114

13

P.B

L

4

21

R

5

20

H/N

7

18

L NF

8

R NF

17

10

ALC

T1/T2

19

Q113

Q109

SWITCHING

+B4

PB

RECRL

IC101
AN7345K
PLAYBACK AND RECORD
/PLAYBACK AMP.

BIAS

Q110

Q107
Q108

MUTING

–B2

+B4

8

IC561

4

IC562

IC561,IC

KIA455

OPE A

RE

1
7

Figure 18 BLOCK DIAGRAM (2/3)

– 18 –

CD-BK250W/CD-BK2600W/CD-BK270W

4

+B4

FL701

FL DISPLAY

47

4344 42 40

CEDIDO

–

Q914

PT801

POWER

4948

AVDD

CLK

RL914

T.F.

RX701

39

36
35
34
33

–

31

REMOTE

1

SENSOR

+B5

SW701-SW703
SW712-SW732

Q906

CD-BK250W/CD-BK2600W: 6 ohms
CD-BK270W: 8 ohms

CD-BK270W ONLY

3

2

KEY

SW601

SPAN

SELECTOR

TO CD

SECTION

+B3

JK701
HEADPHONES

+B5

M901

M

FAN

MOTOR

SO901
SPEAKER
TERMINAL

SR1

SURROUND

SPEAKER

TERMINAL

SW801

VOLTAGE

SELECTOR

230-240 V

220 V
127 V
110 V

+B5

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

13 44

Q907
Q908

Vcc

13

9

-B1

+B1

IC902

KTC2026

IC903

KIA7810AP

+5V

SW5V

6 132

Q701-Q703

67
78

80

VLOAD

79

81

–

89

90

–

92

93

-

100

12456 78

+B5

Q902
Q903
Q905
Q904

L-OUT

7

10

R-OUT

IC901
STK4029S
POWER AMP.

IC904

351

kHz

14

L
R

15

SP. DET.

1

DI

2

CE

24

LK

–20 dB

R

21

ATT

4

R

07
08

ING

B2

Q601

L

Q602

REC/PLAY

+B4

8

1

IC561

4

IC562

7

IC561,IC562

KIA4558P

OPE AMP.

28

29

T1/T2

1

L

15

R

–

+Vcc

8

(2/2)

IC701

VF1

IX0427AW

CONSTANT VOLTAGE REGULATOR

M12

+B3

VF2

+B4
A+10V

VOLTAGE REGULATOR

–VF

+B5

KIA7805AP

16

14

5761 56 54535251 5055 49 48

31

23

IC701

IX0427AW(1/2)

SYSTEM

MICROCOMPUTER

VDD

RESET

–B2

D901

D902~D905

RESET

1112 13

1 0 16 1 7 20 2123152224

9

XL700

4.194304 MHz

Q709

F901

T4A L 250V

F902

T4A L 250V

F904

T2A L 250V

F903

T2A L 250V

Q901

32

+B5

4546

VDD

VDD

+B5

+B5

TRANSFORMER

BIAS

Figure 19 BLOCK DIAGRAM (3/3)

– 19 –

CD-BK250W/CD-BK2600W/CD-BK270W

_

T

6

5

5

5

6

/

6

5

5

0

0

5

1
1

220/10

A

MAIN PWB-A1(1/3)

1
2

B

3
4

CNP7

5

P29 12 - D

6

TO CD SERVO PWB

CNS601

C

D

R-CH

1
2

L-CH

3
4

CD_+B

5
6

BI601

(A_+B) SW_5V

1

CD_+B SW_5V

2

GND

3

L-CH

4

GND

5

R-CH

6

GND

7

M_+12V

8

A+10V

9

GND

10

GND

11

SP_DET

12

P22 1 - F, G

SP_RLY

13

TO POWER SECTION

SW_5V

14

UN_SW_5V

15

–VP

17

VF2

18

VF1

19

P_IN

20

–15V

21

A_GND

CD_GND

A_+B

+B

+B

+B

+B

+B
+B

-B

R618

330

R619

330

AUDIO PROCESSOR

1

C620

1/50

C606

0.15
C614

1/50

C618

1/50

C624
1/50

10

11
12

2
3
4
5
6
7
8
9

DI
CE

VSS
LOUT

LBASS
LTRE

LIN
LSEL0
L4
L3
L2
L1

C610

R604

1/50

10K

390

R612

R614

R615

3.3K

3.3K

Q601

KTC3199 GR

390

R613

KTC3199 GR

22K

R620

C636

0.001

C635

0.001
R611

2.2K

Q602

C639

1/50

R610

2.2K

R621

C608

R606

0.1

3.9K

C612

0.0027

C616

4.7/50

C622

1/50

R608

1.2K

C626

0.0056

22K

R616

2.2K

Q604

C638

KTC3199 GR

0.001

C637

0.001
R617

2.2K

Q603

KTC3199 GR

C640

22/50

+B

+B

-B -B

R601

R602

1K

1K

–

+

IC601

LC75341

CCB

INTERFACE

–

+

+

–

+

AUX
DECK
TUNER

CD

C601

220/16

24

CLK

+B

VDD

23

–

+

VREF

+

–

ROUT

+

–

RBASS

RTRE

–

RSEL0

+

–

+B

C6
22/

22

C

21
20

C60

0.15

19

RIN

18

C

1/

17

C

4.7

R4

16

C6

1/

R3

15

C6

1/

R2

14

C

1/

R1

13

C623

1/50

E

F

G

TAPE 1

PLAYBACK HEAD

R-CHL-CH

ERASE HEAD

R-CH

L-CH

TAPE 2

RECORD/

PLAYBACK HEAD

Q112~Q114: SWITCHING

R147

10K

R148

4.7K

Q113

KRC104 M

2

213

R111

R101

R102

47K

R107

4.7K

R109

4.7K

R110

47K

R108

1

15K

1K

1K

Q106

C136

0.022

R146

10K

Q112

KTA1266 GR

C101

T1_R

1

1

A_GND

2

2

T1_L

3

3

CNP101

M_GND

1

ERASE

1

2

6
5
4
3
2
1

2
3
4
5
6

CNS102

T2_R2

3

A_GND

4

T2_R1

5

T2_L1

6

T2_L2

7

BI102

560P

C102
560P

C103
180P

C104
180P

Q101

2SC1845 F

R103

2.2K
R105

3.3K

Q103

2SC1845 F

Q104

R106

3.3K

2SC1845 F

R104

2.2K
Q102

2SC1845 F

Q101~Q106: SWITCHING

3

Q114

KRC104 M

Q105

KTC3199 GR

560P

C105

KTC3199 GR

560P

C106

R112 15K

R
C107

330P

L

R149

150

C141

C108
330P

R114

1K

100/16

R113

1K

L

100/25

100/25

C111

C112

C113

0.033
R117

100K

C110
330P

C114

0.033

R116

56

+B

R

R137
220K

C150

10/50

R115

56

33K

R121

C115

R123

560P

5.6K

C117

47/25

R119

3.9K

C109
330P

–

+

112K

Hich=T1

112K

+

–

5

321

4

R118

R120

100K

3.9K
R124

5.6K

C116

C118

560P

47/25

R122

PLAYBACK AND RECORD/

PLAYBACK AMP.

R125

C119

0.0022

6

C121

0.022
C122

C120

33K

IC101

AN7345K

68K

R129

3.3/50

0.0022

R127

R128

6.8K

3.9K

7

6.8K

R126

C123

C124

3.9K

270P

270P

R130

R139

10K

Q107

KTC3199 GR

MUTING

R133

1.5K

R131

C127

C125
22/50

–

+

Hich=CHROME

+

–

8

C126
22/50

R132

C128

1.5K

100

0.022

56K
56K

100

0.022

C129

C130

0.0033

9

0.0033

C131

C132
47/25

R138

10K

R135

47/25

10 11

R134
10K

ALC

REC

Q

KTC3

MU

10K

C134

C133

22/50

1415161718192021222324

NOR/CRO2

RIPPLE

ALC

H

• NOTES ON SCHEMATIC DIAGRAM can be found on page 39.

1

23456

Figure 20 SCHEMATIC DIAGRAM (1/11)

– 20 –

P30 6 - C

0

0022

3

3/50

68K

TO MIC PWB

CNPK1

1 2 3 4 5 6 7 8 9

A_GND

A_+10V

KOK OUT(R)

KOK OUT(L)

KOK IN(L)

1 2 3 4 5 6 7 8 9

KOK IN(R)

DI

CLK

10

MIC IN

KOK LATCH

10

CD-BK250W/CD-BK2600W/CD-BK270W

CNSK1

BIK1

+B

FM SIGNAL
PLAYBACK SIGNAL

IC601
C75341
PROCESSOR

–

+

CCB

+

TERFACE

–

+

–

–

+

+

–

+

–

AUX
DECK
TUNER

CD

+B +B

R137
220K

Q107

C150

10/50

KTC3199 GR

MUTING

3.9K

R127

1.5K

R131

270P

C123

6.8K

R129

C125
22/50

Hich=CHROME

7

8

C126
22/50

6.8K

R128

.

270P

C124

.

3.9K

R126

1.5K

R130

K
RECORD/

AMP.

CLK
VDD

VREF

ROUT

RBASS

RTRE

RSEL0

R139

10K

100

R133

C127

0.022

–

+

56K
56K

+

–

100

R132

C128

0.022

RIN

R4
R3
R2
R1

C129

C130

24
23
22
21

20
19
18
17
16
15
14
13

0.0033

9

C132
47/25

0.0033

-B

C131

C601

220/16

+B

C603
22/50

C605

0.15

C623

1/50

REC_R

R138

10K

KTC3199 GR

MUTING

10K

R135

47/25

C133

22/50

NOR/CRO2

ALC

ALC

10 11 12

R134
10K

C607

0.1

C613

1/50

C615

4.7/50
C617

1/50

C619

1/50
C621

1/50

Q108

C134

220/10

131415161718

RIPPLE

C135

0.022

VCC

GND

IC101

AN7345K

0.0027

R622
220K

R607

C611

R158

C137

3.9K

220

C609
1/50

R609

1.2K

C625

0.0056

R623
220K

R136

KTA1266 GR

47K

R143

22K

R144

(ML)

0.047

R603

1K

R605

10K

220K

+B

R140

Q109

SWITCHING

82

R142

C138

0.0082
(PP)

C139

0.039(ML)

+B

+B

47K

Q111

KTC3203 Y

4.7

R145

L103

330µH

1

2

Q110

KRC104 M

BIAS

R141

4.7K

BIAS

C140

47/25

+B

+B

3

+B

VIDEO SIGNAL
RECORD SIGNAL

CD SIGNAL
MIC SIGNAL

TUN_SM

D_GND
T_BIAS

T_T1/T2

REC/PLAY

SMUTE

SPA_SIG

A_GND

M_+12V

+B

-B
–20dB

M_GND

SW_5V

+B

UN_SW 5V

+B

SP_DET
SP_RLY

TUN_SM

CLK

TUN_R

(A_GND)GND

TUN_L

A+10V

+B

(D_GND)GND

R692

C690
390P

C691
390P

33K

R693

33K

DS1SS133

DS1SS133

R690

6.8K

R691

6.8K

CLK

–15V

VF1
–VF
VF2

P_IN

DO

CE

D690

D691

CE
DO

DI

DI

C693

0.001

CNP701

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18

19
20
21

22
23
24
25
26
27
28
29
30

31
32

SPAN SELECTOR

10 kHz/100 kHz

9 kHz/50 kHz

22
23
24
25
26
27

P25 11 - H

28
29

30
31

L-CH

VIDEO/AUX

R-CH

CHASSIS

FFC701

1

32

SW601

TO TUNER SECTION

JK690

IN

CNS701

P27 12 - C

TO DISPLAY PWB

7

8 9 10 11 12

Figure 21 SCHEMATIC DIAGRAM (2/11)

– 21 –