Sharp CD-BK300W User manual

– 1 –
CD-BK300W
No. S5133CDBK300W
CONTENTS
Page
SAFETY PRECAUTION FOR SERVICE MANUAL ........................................................................................................... 2
VOLTAGE SELECTION..................................................................................................................................................... 2
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................. 3
SPECIFICATIONS ............................................................................................................................................................. 3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 6
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
MINI COMPONENT SYSTEM
MODEL CD-BK300W
• 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.
SHARP CORPORATION
CD-BK300W Mini Component System consisting of
CD-BK300W(main unit)and CP-BK300(speaker system).

CD-BK300W
– 2 –
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.
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
IMPORTANTTHATTHEFOLLOWINGPRECAUTIONSAREOBSERVEDDURINGSERVICINGTOPROTECTYOUREYES
AGAINST EXPOSURE TO THE LASER BEAM.
1-WHENTHECABINETISREMOVED,THEPOWERISTURNEDONWITHOUTACOMPACTDISCINPOSITIONANDTHE
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.
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.
Turntheselector witha screwdriver untilthe appropriatevoltagenumber appearsinthe window(110 V, 127V, 220Vor 230V-240V AC).

– 3 –
CD-BK300W
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-BK300W
CP-BK300
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
General
Amplifier
CD player
Tuner
Cassette deck
Power source AC 110/127/220/230 - 240 V, 50/60 Hz
Power consumption 210 W
Dimensions Width: 270 mm (10-11/16")
Height: 330 mm (13")
Depth: 372 mm (14-11/16")
Weight 8.7 kg (19.2 lbs.)
Output power MPO: 480 W (240 W + 240 W) (10 % T.H.D.)
Main speaker (woofer and tweeter): 200 W (100 W + 100 W)
Subwoofer: 280 W (140 W + 140 W)
RMS: 250 W (125 W + 125 W) (10 % T.H.D.)
Main speaker (woofer and tweeter): 100 W (50 W + 50 W)
Subwoofer: 150 W (75 W + 75 W)
RMS: 188 W (94 W + 94 W) (0.9 % T.H.D.)
Main speaker (woofer and tweeter): 72 W (36 W + 36 W)
Subwoofer: 116 W (58 W + 58 W)
Output terminals Speakers: 6 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 3-way type speaker system
5 cm (2") Tweeter
13 cm (5-1/4") Woofer
16 cm (6-1/2") Subwoofer
Maximum input power
(Total) 250 W
Rated input power
(Total) 125 W
Impedance 6 ohms
Dimensions Width: 287 mm (11-5/16")
Height: 330 mm (13")
Depth: 281 mm (11-1/16")
Weight 5.0 kg (11.1 lbs.)/each
QACCA0003AW00 QACCL0005AW00
QACCB0011AW00
QACCE0010AW00
QACCZ0007AW00
QACCJ0007AW00
QPLGA0003AWZZ QPLGA0004AWZZ

CD-BK300W
– 4 –
NAMES OF PARTS
CD-BK300W
Front panel
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 Control
8. Extra Bass/Demo Mode Button
9. Disc Tray Open/Close Button
10. Disc Number Select Button (with Indicator)
11. Disc Skip Button
12. Tuning and Time Up Button
13. Tape 2 Reverse Play Button (with Indicator)
14. CD Button
15. Tuner (Band) Button
16. Tape (1 2) Button
17. Video/Auxiliary Button
18. Dimmer Button
19. Clock Button
20. Timer/Sleep Button
21. Headphone Socket
22. CD or Tape Stop Button (with Indicator)
23. CD Play, Tape 1 Play or Tape 2 Forward Play Button
(with Indicator)
24. Tape 2 Reverse Mode Select Button
25. CD Track Up or Fast Forward, Tape 2 Fast Wind,
Tuner Preset Up Button
26. Tuning and Time Down Button
27. Memory/Set Button
28. Tape 2 Record Pause Button
29. CD Track Down or Fast Reverse, Tape 2 Fast Wind,
Tuner Preset Down Button
30. Microphone Level Control
31. Microphone Socket
678 9
10
11
18 23
22
171615141312
26 27 28 30 3129
24
25
19
20
21
4
5
1
2
3
Display
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 Analyzer/Volume Level Indicator
1
234 6
8
17
17 17
913 14 15 16
7
10
11
12
5

– 5 –
CD-BK300W
CD-BK300W
Remote control
1. Remote Control Transmitter
2. Echo Level Up and Down Butto
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
1
2
15
16
17
18
19
20
22
3
6
4
7
8
9
10
13
12
11
5
14
21
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.
Rear panel
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
1
3
2
4
5
6
7
8

CD-BK300W
– 6 –
OPERATION MANUAL
CP-BK300
1. Subwoofer
2. Bass Reflex Duct
3. Tweeter
4. Woofer
5. Speaker wire for SUBWOOFER terminals
6. Speaker wire for MAIN terminals
5
6
3
4
2
1
System Connections
Setting the AC voltage selector
Check the setting of the AC voltage selector located on the rear panel before plug-
ging 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 num-
ber 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 pro-
longed period of time.
AC Plug Adaptor
In areas (or countries) where an AC socket as shown in illustration is used, con-
nect 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 coun-
tries should maintain either a 100 kHz or a 50 kHz interval between broadcasting fre-
quencies 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:
Caution:
This operation will erase all data stored in memory including clock, timer settings,
tuner preset, and CD programme.
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.

– 7 –
CD-BK300W
Setting the Clock
In this example, the clock is set for the 24-hour (0:00) display.
Note:
The "CLOCK" or time will flash at the push of the CLOCK button when the AC power
supply is restored after a power failure or unplugging the unit.
Readjust the clock as follows.
To readjust the clock:
Perform "Setting the Clock" from the beginning. If the time display is flashing, step 3
(for selecting the 24-hour or 12-hour display) will be skipped.
To change the 24-hour or 12-hour display:
1
Press the ON/STAND-BY button to turn the power on.
2
Press the CLOCK button and within 5 seconds, press the MEMO-
RY/SET button.
3
Press the TUNING/TIME ( or ) button to select 24-hour or 12-
hour display and then press the MEMORY/SET button.
"0:00" The 24-hour display will appear.
(0:00 - 23:59)
"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 step 3 under "If trouble occurs".)
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.
1 Clear all the programmed contents. [Perform to step 3 under "If trouble occurs" on.]
2 Perform "Setting the Clock" from the beginning.
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.
0.2 m - 6 m
(8" - 20')
Remote sensor

CD-BK300W
– 8 –
Troubleshooting Chart
Many potential "problems" can be resolved by the owner without calling a service
technician.
If something is wrong with this product, check the following before calling your autho-
rised SHARP dealer or service centre.
General
CD player
Tuner
Cassette deck
Karaoke
Remote control
Symptom Possible cause
The clock is not on time. Did a power failure occur? Reset the
clock.
When a button is pressed, the unit
does not respond. Set this unit to the power stand-by mode and then turn it back on.
Ifthe unit still malfunctions, reset it. (Refer
to step3 under "If trouble occurs"
No sound is heard. Is the volume level set to "0"?
Are the headphones connected?
Are the speaker wires disconnected?
Isthekaraokemode set to "L-CH", "R-CH"
or "V-CANCEL"?
Symptom Possible cause
Playback does not start. Is the disc loaded upside down?
Playback stops in the middle or is
not performed properly. Does the disc satisfy the standards?
Is the disc distorted or scratched?
Playback sounds are skipped, or
stopped in the middle of a track. Is the unit located near excessive vibra- tions?
Is the disc very dirty?
Has condensation formed inside the unit?
Symptom Possible cause
Radio makes unusual noise con-
secutively. Is the unit placed near the TV or comput- er?
Is the FM aerial or AM loop aerial placed
properly? Move the AC power lead away
from the aerial if located near.
Symptom Possible cause
Cannot record. Is the erase-prevention tab removed?
Cannot record tracks with proper
sound quality. Is it a normal tape? (You cannot record on a metal or CrO tape.)
Cannot erase completely.
Sound skipping. Is there any slack?
Is the tape stretched?
Cannot hear treble. Are the capstans, pinch rollers, or heads
dirty?
Sound fluctuation.
Cannot remove the tape. If a power failure occurs during playback,
the heads remain engaged with the tape.
Do not open the compartment forcibly.
Wait until electricity resumes.
Symptom Possible cause
The vocal part of a multiplexed
disc is not heard. Isthekaraokemode set to "L-CH", "R-CH" or "V-CANCEL"?
Symptom Possible cause
The remote control does not oper-
ate. 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:
Caution:
This operation will erase all data stored in memory including clock, timer settings,
tuner preset, and CD programme.
Before transporting the unit
1 Set the unit to the stand-by mode and turn the power on again.
2 If the unit is not restored in step 1, unplug and plug in the unit, and then turn
the power on.
3 If neither step 1 nor 2 restores the unit, do the following:
Press the ON/STAND-BY button to enter the power stand-by mode.
Whilst pressing down the button and the X-BASS/DEMO button, press the
ON/STAND-BY button until "CLEAR AL" appears.
1 Press the ON/STAND-BY button to turn the power on.
2 Press the CD button.
3 Press the OPEN/CLOSE button to open the disc tray.
Remove all CDs inserted in the unit.
4 Press the OPEN/CLOSE button to close the disc tray.
Make sure that "NO DISC" is displayed.
5 Press the ON/STAND-BY button to enter the stand-by mode, and then unplug
the AC power lead from the AC socket.

– 9 –
CD-BK300W
1 Top Cabinet 1. Screw ....................... (A1) x4 9-1
2 Side Panel 1. Screw ....................... (B1) x8 9-1
(Left/Right)
3 CD Player Unit/ 1. Turn on the power supply,... 9-2
CD Tray Cover open the disc tray, take out
the CD tray cover, and close.
(Note 1)
2. Screw .......................(C1) x1
3. Hook......................... (C2) x3
4. Hook......................... (C3) x2
5. Socket ......................(C4) x2
4 Rear Panel with 1. Screw .......................(D1) x9 9-2
Fan Motor 2. Socket ......................(D2) x1
5 Main PWB 1. Screw ....................... (E1) x1 9-2
2. Flat Cable ................ (E2) x1 10-2
3. Socket ...................... (E3) x5 10-2,10-3
6 Amp. PWB 1. Screw ....................... (F1) x5 10-3
2. Socket ...................... (F2) x1
3. PWB Holder ............. (F3) x2
7 Front Panel 1. Screw .......................(G1) x1 10-3
8 Display PWB 1. Knob......................... (H1) x1 10-4
2. Screw ..................... (H2) x13
3. Flat Cable ................ (H3) x1
9 Tape Mechanism 1. Open the cassette holder. ... 10-4
2. Screw ........................(J1) x5
10 Headphones PWB 1. Screw ....................... (K1) x1 10-4
11 Mic PWB 1. Screw ....................... (L1) x1 10-4
12 Turntable 1. Hook........................ (M1) x2 10-5
2. Cover ...................... (M2) x1
13 Disc Tray 1. Turn fully the lock lever in the. 9-3
arrow direction .
2. While holding the lock lever,rotate 10-1
the cam gear until the cam gear
rib engages with the clamp lever.
3. Push the slide chassis backward to 10-6
engage the claw with the groove
and remove it in the direction
of the arrow. ................. (N1) x6
14 CD Servo PWB 1. Screw ....................... (P1) x1 11-1
(Note 2) 2. Hook......................... (P2) x2
3. Socket ...................... (P3) x4
15 CD Mechanism 1. Hook.........................(Q1) x2 11-2
2. Hook.........................(Q2) 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.Takeoff nylonbandsor wireholderswhere theyneedto
beremovedwhendisassemblingtheunit.Afterservicing
theunit,be suretorearrange the leadswherethey were
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 9-2
Figure9-3
CD-BK300W
STEP REMOVAL PROCEDURE FIGURE
Figure 9-1
CD-BK300W
Note 1: How to open the changer manually. (Fig. 9-3)
1. In this state, turn fully the lock lever in the arrow direction through
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. (Fig. 10-1)
3. After that, push forward the slide Chissis.
Note 2:
1. After removing the connector for the optical pickup from the
connector,wraptheconductivealuminiumfoilaroundthefrontend
of the connector so as to protect the optical pickup from electro-
static 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.
Lock Lever
CD Player Unit
(Bottom View)
(B1) x 4
ø3 x 10mm (B1) x 2
ø3 x 10mm
Rear
Panel
(B1) x 2
ø3 x 10mm
Side Panel
(Right)
Side Panel
(Left)
(A1) x 2
ø3 x 12mm
(A1) x 2
ø3 x 12mm Top Cabinet
(E1) x 1
ø3 x 10mm
(C3) x 1
(D1) x 2
ø3 x 10mm
CD Player
Unit
CD Tray Cover
Pull
(C3) x 1
(C4) x 2 (C2) x 3
1
1
2
CD Servo
PWB
(C1) x 1
ø3 x 10mm
(D1) x 6
ø3 x 10mm
Amp.
PWB
(D2)x1
Rear
Panel
Main PWB
Transformer PWB
Lug Wire
(D1) x 1
ø3 x 10mm

CD-BK300W
– 10 –
Figure 10-1
Figure 10-2
Figure 10-3
Figure 10-4
Figure 10-5
Figure 10-6
Clamp Lever
CD Player Unit
(Top View)
Cam Gear Rib
Turntable
Slide
Chassis
(M2) x 1
CD Player Unit
(M1) x 2
1
3
2
(N1) x 3
(N1) x 3
Main PWB
Main PWB
Amp.
PWB
Transformer
PWB
(E2) x 1
Power PWB
(E3) x 1
(E3) x 1
(E3) x 1
(E3) x 1
Mic PWB
Front Panel
Amp.
PWB
(F1) x 2
ø3 x 10mm
(F1) x 2
ø3 x 10mm
(F2) x 1
(F3) x 1
(F1) x 1
ø3 x 8mm (G1) x 1
ø3 x 8mm
Push (F3) x 1
Push
Headphones
PWB
(F4) x 1
Front
Panel
(E3) x 1
Tape
Mechanism
(H3) x 1
(H2) x 13
ø3 x 10mm
(J1) x 5
ø3 x 10mm
(H1) x 1
Display PWB
Headphones
PWB
Open
Front Panel
Cassette
Holder
Tape
Mechanism
(K1) x 1
ø3 x 10mm
Mic PWB
Lug Wire
(L1) x 1
ø3 x 10mm

– 11 –
CD-BK300W
1 Side Panel/ 1. Screw ..................... (A1) x4 11-3
Front Panel 2. Net.......................... (A2) x1
3. Caching Holder ...... (A3) x4
4. Screw ..................... (A4) x4
2 Subwoofer 1. Screw ..................... (B1) x4 11-4
3 Woofer 1. Screw ..................... (C1) x4 11-4
4 Tweeter 1. Screw ..................... (D1) x2 11-4
STEP REMOVAL PROCEDURE FIGURE
Figure 11-3
Figure 11-1 Figure 11-2
CP-BK300
Figure 11-4
(P3) x 2
(P2) x 2
(P3) x 2
CD Servo
PWB Slide
Chassis
(P1) x 1
ø3 x 8mm
(Q2) x 3
(Q1) x 1 (Q1) x 1
CD
Mechanism
(A1) x 4
ø4 x 20mm
(A4) x 2
ø4 x 20mm
(A3) x 2
(A3) x 2
Fromt Panel
Side Panel
(A2) x 1
Net
(A4) x 2
ø4 x 20mm
(C1) x 4
ø4 x 16mm
(B1) x 4
ø4 x 16mm
(D1) x 2
ø3 x 10mm
Tweeter
Woofer
Subwoofer

CD-BK300W
– 12 –
REMOVING AND REINSTALLING THE MAIN PARTS
TAPE MECHANISM SECTION
Perform steps 1 to 7 and 9 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.
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.
Figure 12-1
Figure 12-2
Figure 12-3
Figure 12-4Figure 12-5
(A1) x 2
Ø2 x 6mm
TAPE 2
Record/Playback
Head
Erase Head
Clutch Ass'y
(B1) x 1
Ø2 x 9mm (B1) x 1
Ø2 x 5mm
TAPE 1
Playback
Head
Clutch Ass'y
Pinch Roller
(C1) x 1 <A>
Pull
<B>
Pull
Pinch
Roller
Pawl
TAPE 2 TAPE 1
Main Belt
(E1) x 1
TAPE 2
Main Belt
(D1) x 1
TAPE 1
FF/REW
Belt
(D2) x 1
FF/REW
Belt
(E2) x 1
Motor
Motor
Main Belt
(D1) x 1
Main Belt
(E1) x 1
(F1) x 2
Ø2.6 x 5mm
Motor
Clutch Ass'y

– 13 –
CD-BK300W
(A1) x 2
(A1) x 1
Loading MotorLoading
Motor PWB
Slide
Chassis
(A1) x 2
Pulley
Drive Belt
(A2) x 1
Loading
Motor
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.Removethe screws (B3) x2pcs., to removetheshaft (B4).
3. Remove the pickup.
Note
After removing the connector for the optical pickup from the
connectorwraptheconductivealuminiumfoilaroundthefront
end of connector so as to protect the optical pickup from
electrostatic damage.
Figure 13-2
CD MECHANISM SECTION
Perform steps 1, 2, 3, 12, 13, 14 and 15 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.
Figure 13-1
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 13-3
(B3) x 2
ø2.6 x 6mm
Shaft
(B4) x 1
Stop Washer
(B1) x 1
Gear
(B2) x 1
CD Mechanism
Pickup
TAPE MECHANISM
Tape
Motor
Variable Resistor in motor

CD-BK300W
– 14 –
Test Stage Frequency Frequency
Display Setting/
Adjusting
Parts
Instrument
Connection
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
*1. Input: Antenna Output: TP301
*2. Input: Antenna Output: Speaker terminal
•FM RF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
FM Band — 87.50 MHz T301(fL): *1
Coverage 1.3 V ±50 mV
FM RF 98.00 MHz 98.00 MHz L312 *2
(10-30 dB)
Test Stage Instrument
Connection
Frequency Frequency
Display Setting/
Adjusting
Point
Figure 14-1 ADJUSTMENT POINTS
Figure 14-2
Items adjusted automatically
(1)Offsetadjustment (The offset voltagebetweenthe 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)Gainadjustment(The gainiscompensatedinsidetheIC
sothatthe loopgainat the gaincrossoverfrequency will
be 0 dB.)
* Focus gain adjustment
* Tracking gain adjustment
•Adjustment
Since this CD system incorporates the following automatic
adjustment functions, readjustment is not needed when
replacingthepickup. Therefore,differentPWBsandpickups
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.
IC301
AM IF
FM IF FM RF
T303
T306
T302 L312
AM
TRACKING fL
AM BAND
COVERAGE fL
T301
T351
FM BAND
COVERAGE fL
MAIN PWB
CNP301
AM LOOP
ANTENNA
SO302
FM ANTENNA
TERMINAL
TP302
R357
R316
TP301
T
T
EFBL
FDO
TE
Stopped
CH1=500 mV
DC 10:1 CH2=200 mV DC 10:1 CH3=1 V DC 10:1 500 ms/div
(500 ms/div)
NORM:20 kS/s
1
2
3
=Record Length=
Smoothing : ON CH1 : 0.000 V
CH2 : 0.000 V Main : 100 K Zoom : 2 k Mode : SINGLE Type : EDGE CH1
Delay : 0.0 ns
Hold off : 0.2 µs
CH3 : 0.00 V
CH4 : 0.00 V
BW : FULL
=Trigger==Filter= =Offset=
CH2
v/DIV
200 mV
1999/04/05 20:26:47

– 15 –
CD-BK300W
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.
Do TOC IL. Do normal play
When these following key is input
into PLAY key, track number can
be appoint directly
<<PLAY>> key input. <<MEMORY>> key input.
<< 1>> key: Track 4
<< 2>> key: Track 9
<< 3>> key: Track 15
<<STOP>> key input.
STOP
Laser ON.
<<MEMORY>> key input.
Tracking OFF play at that
specific point.
<<MEMORY>> key input.
Tracking ON play from
that specific point.
<<STOP>> key input.
STOP
IL isn't done
VOL — Last memory
BAL — CENTER
P.GEQ — FLAT
X-BASS — OFF
To cancel : Power OFF
Sliding the PICKUP with
<< >>, << >> button
must only be in STOP mode.
<<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"
Adjustmentresultautomaticallywill
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"
<<MEMORY>> key input.

CD-BK300W
– 16 –
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:

– 17 –
CD-BK300W
Figure 17 BLOCK DIAGRAM (1/3)
+5V
CNS4 BI4
CNP4
M3
T/T UP DOWN
LOADING
+3.3V
TO DISPLAY SECTION
TO MAIN SECTION
CONSTANT
VOLTAGE
Q2
LASER
DRIVER
+3.3V
Q1
+5V
PICKUP UNIT
IC1
LC78645E
CD SERVO
VVDD LDD LDS
M
SW3
DISC
NUMBER
SW2
CLAMP
SW1
OPEN/
CLOSE
CNP8
CNP7
TRACKING COIL
FOCUS COIL
SW4
PICKUP
IN
M2
SLED
MOTOR
M1
SPINDLE
MOTOR
M
M
R-CH
Q3
XVDD RVDD LVDD ADAVDD RFVDD
XL1
33.8688 MHz
OC. DISC NO CLAMP SW CD RES CLK DI DO CE DRF WRQ
+5V (+B6) +5V (+B6)
DGND L-CH
AGND
VCC3
VCC2
VCC4
VCC1
IC2
M63001FP
FOCUS/TRACKING/
SPIN/SLED
DRIVER
XIN
XOUT
RES
WRQ
DO
DI
CLK
CE
TIN2 TIN1 FIN2 FIN1
TD0
FD0
SPDO
SLDO
CONT5
CONT2 CONT3 CONT4
RCHO
RVSS
LVSS
LCHO
80
42
79
75
20
540
18
24
23 14
8
21
22
29
35
41
47 46
710
987
15
12
17 25 42
41 8339
4765 16
82
26 27
316452
316452
316452
54
71
61
62
63
69
57
56
55
51
50
40
37
19
28
26
23
22
21
3271689
615432
4543 44 25 70
64
65
66
48
49
18

CD-BK300W
– 18 –
Figure 18 BLOCK DIAGRAM (2/3)
VIDEO IN
AUX
R
LR
L
R
L
R
L
R
R
L
L
JK601
FM
+B +B4
CLK
+B4
AM IF
OSC BUFF
AM
FM IF
FM
OSC
B.P.F
CNP301
CNS11
–20dB
ATT
Q103-
Q106
–B2
+B4
KIA4558P
OPE AMP.
IC701
(
IX042
7
IC703
IC702
Q121
Q122
Q603
Q604 Q605
Q606
10.7MHz
450kHz
FM
ANTENNA
REC/PLAY
CLK
CE
DI
SYSTEM
MUTE
DO DI CE
MO/ST
SWITCHING
+B4
FM/AM
IC302
LC72131
PLL(TUNER)
FM/AM
OUT
L
R
BIAS
T1/T2
MUTING
P.B.
REC
AC BIAS
TAPE
TUNER
CD
MIC
PB
FROM CD SECTION
CNP7
ERASE
HEAD
SWITCHING
SWITCHING
SWITCHING
BIAS
Q110
Q111
Q109
Q126
SWITCHING
Q124
L103
OSC
BIAS Q128
L104
Q107
Q108
REC. P.B. HEAD
TAPE 2
P.B. HEAD
TAPE 1
L-CH
R-CH
L-CH
R-CH
IC601
LC75341
AUDIO PROCESSOR
H/N
P.B
+B4
R
L
REC
R
L
L NF
R NF
ALC
REC
T1/T2
T1/T2
NOR/
HIGH
REF
R REC
L REC
POP REDUCE
R NF
L NF
SWITCHING L(T2)
R(T2)
R(T1)
L(T1)
IC101
PLAYBACK AND
RECORD/
PLAYBACK AMP.
R
L
FM/AMMPXIN
STEREO
AM RF IN
AM OSC IN
FM
Q360
VT
OSC
X352
4.5MHZ
AM BAND
COVERAGE
AM TRACKING
T303 T306
Q302
X351
456kHz
MO/ST VCOFM
DET
FM+BGNDAM IF
CF351
IC303
LA1832S
FM IFDET.
FM MPX./
AM IF MPX.
AM MIX
CF352
T351
FM
RF
OSC
FM
L312 T301
CF303
T302
IC301
TA7358AP
FM FRONT END
BF301
7
8
412
8
2
9
3
1
CNP301
JK1
MIC
1
2
2
1
24
2
23
3
22
6
9
16
14
12
15 19
10
17
18
8
7
20
5
21
13
4
34578
9
6
2
1
12 45981713
14
15
1216182123
20 1 22 15 16 11
17
2110
16
10
15
11
14
12
13
7
3
79
9
7 18 8 17 3
1
23
2
24
21
4
456
L
R
ICK1
M65856SP
MIC AMP.
ICK2
KIA4558P
OPE AMP.
LATCH
MIC IN
VRK1
MIC
VOLUME
CLK
DATA
LOUT
ROUT
L IN
R IN
VCC
+B5
+B4
98
7
5
6
2
3
1
12
13
23
QK1
32
31
35
36
42
41
40

– 19 –
CD-BK300W
Figure 19 BLOCK DIAGRAM (3/3)
T801
POWER TRANSFORMER
110 V
127 V
220 V
230-240 V
SW801
VOLTAGE
SELECTOR
AC POWER
SUPPLY CORD
AC 110/127/220/
230-240 V, 50/60 Hz
+B6
IC704
IC704
BU2092F
INPUT/OUTPUT
EXPANDER
4
18
1
2
3
–VF
VF2
VF1
Q801
+B6
+B5
+5V
UN-SW5V
KIA7805AP
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
AN78L05
Q852
Q821
+B4
+B3
+B1
–B1
+B2
–B2
+B6
+B3
+B5
- -
+B4
+B4
-
JOG
JOG701
-
Q701-Q703
Q710-Q712
R
L
IC903
KIA4558P
OPE AMP.
R
R
LL
–20dB
ATT
+B5
RX701
REMOTE
SENSOR
.
IC701(2/2)
IX0427AW
D804~D807
D803
D802
RY902
SPAN
SELECTOR
SP RELAY
ON-OFF
RESET
RY901
JK670
HEADPHONES
M901
FAN
MOTOR
FAN MOTOR
DRIVER
M
+B6
M902
FAN
MOTOR
M
Q910
Q909
Q709
Q902
Q901
Q903
Q904
Q906
Q905
Q907
Q908
6
03
6
04 Q605
Q606
Q851
Q850
IC902
STK4029S
POWER AMP.
A+10V
M12V
F805
T2A L 250V
F806
T2A L 250V
F804
T5A L 250V
F802
T4A L 250V
F801
T4A L 250V
+Vcc–Vcc
L-OUT
R-OUT F803
T5A L 250V
CLK
MAIN
REC/PLAY
VLOAD
RESET
SUBWOOFER
+B5 +B5
+B5
+B5
VDD VDD
KARAOKE
LATCH
VDD
R-OUT
L-OUT
SP. DET.
-
SYSTEM
MUTE
CE DI DO
XL701
4.194304MHz
--
–Vcc
+Vcc
IC901
STK40271
POWER AMP.
BIAS
T1/T2
AVDD
KEY
SW701-SW703
SW709-SW717
SW722-SW734
TO CD
SECTION
T.F.
IC701(1/2)
IX0427AW
SYSTEM MICROCOMPUTER
FL701
FL DISPLAY
8
13614 1520 29343553 5657582
3
2
1
7
1
28
29
2
1
15 13 11
9
1
7
3
2
6
5
1
15 7
8913 11
8
7
6541 7 9 10111213 151617 20212223
22
23
58
24
31
33
34
35
36
37
38
39
404142434445464849505152535455565761
61
60
78
79
80
85
86
91
92
100
SO901
~~~
~

CD-BK300W
– 20 –
Figure 20 SCHEMATIC DIAGRAM (1/10)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 39.
CD SIGNAL
CD MOTOR PWB-G
CD SERVO PWB-C
4
1
9
101112131415161718192021
22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
8765432
9
1
0
1
1
1
2
1
3
1
4
1
5
1
6
1
7
1
8
1
9
2
0
8
7
6
5
4
3
2
1
TP3
TP2 TP1
L
VCC4
M–
M+
VCC3
SPO VCC2
SLDO
VCC
STANDBY
VREF
MUTE
FD
SP–
SL– SL+
SP+
TR– TR+ FO+ FO– GND
GND
GND
FO–
FO–
LD
VR
PD
FO+
TR+
TR–
C
F
B
A
E
GND
PUIN
SL+
SL–
SP–
SP+
VREF
VCC
PICKUP UNIT
TR–
TR–
TR+
TR+
FO+ FO+
FO– PD
VR
LD
F
C
B
A
E
VCC
VREF
SLIDE
SPIN
+
+
–
–
PU-IN
1
2
3
4
5
6
1
2
3
4
5
6
5
3
6
2
7
1
4
5
3
6
2
7
1
4
5
3
6
2
7
1
4
5
3
6
2
7
1
4
4
1
3
6
5
2
4
1
3
6
5
2
M
M
4
8
5
2
1
7
3
6
4
8
5
2
1
7
3
6
4
8
5
2
1
7
3
6
4
8
5
2
1
7
3
6
+
+
–
–+
–
+
+
–
–
+
–
+
–
+
–
2
LASER
DRIVER
CNP1
CNS1A CNS1B
R6
33K
R5
12K
R4
12K R3
33K
R1
12K
R2
12K
C1
47/25
C2
0.01
CNP2
CNS2A CNS2B
C38
0.01
C39
100/10
R44
12K
C41
100/10
CNP3
CNS3A CNS3B
R13
1K
R14
C12
100P
C11
0.22/50
C10
10/50
C9
100/10
C50
22P
(CH)
R12
330
C7
100P
R10
27K
C5
0.047(ML)
R11
10K
R9
3.3
Q1
KTA1266 GR
C4
0.001
C49
47/25
C3
47/25
C8
0.0047
C6
0.1
IC2
M63001FP
FOCUS/TRACKING/
SPIN/SLED DRIVER
C40
220/6.3
R7
47
M1
SPINDLE
MOTOR
M2
SLED
MOTOR
SW4
PICKUP IN