Sharp CD-C449W User manual

– 1 –
CD-C449W/K449W
KARAOKECIRCUIT
No.S8875CDC449W/
CONTENTS Page
SAFETY PRECAUTION FOR SERVICE MANUAL ........................................................................................................... 2
SPECIFICATIONS ............................................................................................................................................................. 3
VOLTAGE SELECTION......................................................................................................................................................3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 7
DISASSEMBLY.................................................................................................................................................................. 9
REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 12
ADJUSTMENT ................................................................................................................................................................. 13
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 17
TYPES OF TRANSISTOR AND LED................................................................................................................................17
WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 18
BLOCK DIAGRAM ........................................................................................................................................................... 19
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD............................................................................................. 22
TROUBLESHOOTING ..................................................................................................................................................... 46
FUNCTION TABLE OF IC................................................................................................................................................ 50
FL DISPLAY..................................................................................................................................................................... 57
REPLACEMENT PARTS LIST/EXPLODED VIEW
CD-C449W
CD-K449W
• 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
●SRS, the SRS Logo (●) and the Sound Retrieval System
are registered trademarks of SRS Labs, Inc. in the United
States.
CD-K449W
SECTION CD-C449W
CD-C449W mini component system consisting of
CD-C449W mini component system and
CP-C449 speaker system.
CD-K449W mini component system consisting of
CD-K449W mini component system and
CP-C449 speaker system.

CD-C449W/K449W
– 2 –
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,THEPOWERISTURNEDONWITDOUTACOMPACTDISCINPOSITIONANDTHE
PICK-UP IS ON THE OUTER EDGE THE LASER WILL LIGHT FOR SEVERAL SECONDS TO DETECT A DISC. DO NOT
LOOK INTO THE PICK-UP LENS.
2-THE LASER POWER OUTPUT OF THE PICK-UP UNIT AND REPLACEMENT SERVICE PARTS ARE ALL FACTORY
PRE-SET BEFORE SHIPMENT.
DO NOT ATTEMPT TO RE-ADJUST THE LASER PICK-UP UNIT DURING REPLACEMENT OR SERVICING.
3-UNDER NO CIRCUMSTANCES STARE INTO THE PICK-UP 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.
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 proce-
dures other than those specified herein may result in
hazardous radiation exposure.
As the laser beam used in this compact disc player is
harmful to the eyes, do not attempt to disassemble the
cabinet. Refer servicing to qualified personnel only.
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
CAUTION-INVISIBLE LASER RADIATION WHEN OPEN. DO NOT STARE INTO
BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS.
VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD. STIRRA
EJ IN I STRALEN OCH BETRAKTA EJ STRALEN MED OPTISKA INSTRUMENT.
ADVERSEL-USYNLIG LASERSTRALING VED ABNING. SE IKKE IND I
STRALEN-HELLER IKKE MED OPTISKE INSTRUMENTER.
VARO! AVATTAESSA OLET ALTTIINA NAKYMATON LASERSATEILYLLE.
ALA TUIJOTA SATEESEEN ALAKA KATSO SITA OPTISEN LAITTEEN LAPI.
VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD.
STIRRA EJ IN I STRALEN OCH BETRAKTA EJ STRALEN GENOM OPTISKT
INSTRUMENT.
ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.
VARO ! Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen.
VARNING! Osynlig laserstralning när denna del är öppnad och spärren är urkopplad. Betrakta ej strälen.

– 3 –
CD-C449W/K449W
●General
Power source: AC 110/127/220/230-240 V,
50/60 Hz
Power consumption: 120 W
Dimensions: Width; 270 mm (10-5/8")
Height; 316 mm (12-1/2")
Depth; 343 mm (13-1/2")
Weight: 9.2 kg (20.3 lbs.)
●Amplifier section
Output power: PMPO; 1200 W
MPO; 240 W (120 W + 120 W)
(10 % T.H.D.)
RMS; 150 W (75 W + 75 W)
(10 % T.H.D.)
Output terminals: Speakers; 8 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
CD digital output (optical)
Input terminals: Video/Auxiliary (audio signal)
1/2; 500 mV/47 kohms
Microphone 1/2; 1 mV/4.7 kohms
(CD-K449W only)
●Tuner section
Frequency range: FM; 88 - 108 MHz
SW2; 9.5 - 21.85 MHz
SW1; 3.2 - 7.3 MHz
MW; 531 - 1,602 kHz
●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: 0.15 % (WRMS)
●Compact disc player section
Type: 3-disc multi-play compact disc
player
Signal readout: Non-contact, 3-beam semi-
conductor laser pickup
D/A converter: 1-bit D/A converter
Frequency response: 20 - 20,000 Hz
Dynamic range: 90 dB (1 kHz)
●Speaker section
Type: 3-way type [130 mm (5-1/8")
woofer, 50 mm (2") tweeter and
super tweeter]
Maximum input
power: 150 W
Impedance: 8 ohms
Dimensions: Width; 220 mm (8-11/16")
Height; 316 mm (12-1/2")
Depth; 284 mm (11-3/16")
Weight: 3.6 kg (7.9 lbs.)/each
SPECIFICATIONS
QACCA0001AW00
VOLTAGE SELECTION
The voltage selector is located on the AC voltage selector box. If adjustment is necessary, use a screwdriver in order to turn the
selector in either direction until the correct voltage figure is displayed in the window next to the adjustment screw.
Figure 2 AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
QACCE0008AW00
AQCCJ0003AW00
CD-C449W/K449W
CP-C449

– 3 –
CD-C449W/K449W
●General
Power source: AC 110/127/220/230-240 V,
50/60 Hz
Power consumption: 120 W
Dimensions: Width; 270 mm (10-5/8")
Height; 316 mm (12-1/2")
Depth; 343 mm (13-1/2")
Weight: 9.2 kg (20.3 lbs.)
●Amplifier section
Output power: PMPO; 1200 W
MPO; 240 W (120 W + 120 W)
(10 % T.H.D.)
RMS; 150 W (75 W + 75 W)
(10 % T.H.D.)
Output terminals: Speakers; 8 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
CD digital output (optical)
Input terminals: Video/Auxiliary (audio signal)
1/2; 500 mV/47 kohms
Microphone 1/2; 1 mV/4.7 kohms
(CD-K449W only)
●Tuner section
Frequency range: FM; 88 - 108 MHz
SW2; 9.5 - 21.85 MHz
SW1; 3.2 - 7.3 MHz
MW; 531 - 1,602 kHz
●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: 0.15 % (WRMS)
●Compact disc player section
Type: 3-disc multi-play compact disc
player
Signal readout: Non-contact, 3-beam semi-
conductor laser pickup
D/A converter: 1-bit D/A converter
Frequency response: 20 - 20,000 Hz
Dynamic range: 90 dB (1 kHz)
●Speaker section
Type: 3-way type [130 mm (5-1/8")
woofer, 50 mm (2") tweeter and
super tweeter]
Maximum input
power: 150 W
Impedance: 8 ohms
Dimensions: Width; 220 mm (8-11/16")
Height; 316 mm (12-1/2")
Depth; 284 mm (11-3/16")
Weight: 3.6 kg (7.9 lbs.)/each
SPECIFICATIONS
QACCA0001AW00
VOLTAGE SELECTION
The voltage selector is located on the AC voltage selector box. If adjustment is necessary, use a screwdriver in order to turn the
selector in either direction until the correct voltage figure is displayed in the window next to the adjustment screw.
Figure 2 AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
QACCE0008AW00
AQCCJ0003AW00
CD-C449W/K449W
CP-C449

CD-C449W/K449W
– 4 –
NAMES OF PARTS
CD-C449W/K449W
■Front panel
11. (CD) Disc Tray
12. (CD) Disc Number Select Buttons
13. (CD) Disc Skip Button
14. (CD) Open/Close Button
15. (CD) Disc Number Indicators
16. SRS Indicator
17. (TAPE 2) Direction Indicators
18. (TAPE 2) Reverse Mode Indicator
19. (CD) Play Indicator
10. (CD) Repeat Play Indicator
11. (CD) Pause Indicator
12. (TAPE 2) Record Indicator
13. Timer Record Indicator
14. Timer Play Indicator
15. Sleep Indicator
16. Extra Bass Indicator
17. (CD) Random Play Indicator
18. (CD/TUNER) Memory Indicator
19. (TUNER) FM Stereo Indicator
20. (TUNER) FM Stereo Mode Indicator
21. Karaoke Indicator (CD-K449W Only)
22. Spectrum Analyzer
23. Function Selector Buttons
24. Equalizer Mode Selector Buttons
25. Extra Bass Button
26. Volume Control
27. On/Stand-by Button
28. Headphone Socket
29. Karaoke Maker Switch (CD-K449W Only)
30. Microphone Sockets (CD-K449W Only)
31. Microphone Level Controls (CD-K449W Only)
32. Digital Echo Control (CD-K449W Only)
33. 3D Surround/Demo Mode Button
34. Clock Button
35. Sleep Button
36. (TAPE 2) Reverse Mode Button
37. (CD) Pause Button
38. Jog Dial
39. (CD/TAPE) Stop Button
40. (TAPE) Record Pause Button
41. Balance Control Buttons
42. Timer Button
43. Memory Button
44. (CD) Clear Button
45. (CD) Track Down/Review Button
3(TAPE 2) Fast Wind Button
3(TUNER) Tuning Down Button
46. (TAPE 2) Reverse Play Button
47. (CD) Play/Repeat Button
3(TAPE 1) Play Button
3(TAPE 2) Forward Play Button
48. (CD) Track Up/Cue Button
3(TAPE 2) Fast Wind Button
3(TUNER) Tuning Up Button
49. Editing Speed Selector Buttons
1342
13
18
5678
910 11 12
19 20
24
23 25 26
27 28 29 30 31 32 33
34 35 36 37 38 39 40 41
42 43 44 45 46 47 48 49
1415 16
17
21 22

– 5 –
CD-C449W/K449W
11. (TAPE 1) Cassette Compartment
12. (TAPE 2) Cassette Compartment
■Rear panel
11. CD Digital Output Socket
12. Video/Auxiliary (Audio Signal) Input Sockets
13. Span Selector Switch
14. FM 75 Ohms Aerial Terminal
15. Aerial Earth Terminal
16. SW1/SW2/MW Aerial Terminal
17. AC Voltage Selector
18. AC Power Lead
19. Speaker Terminals
■Speaker section
11. Super Tweeter
12. Tweeter
13. Woofer
14. Bass Reflex Ducts
15. Speaker Terminals
12
7
8
123
4
5
6
9
1
2
3
4
5
CP-C449

CD-C449W/K449W
– 6 –
■Remote control
11. Remote Control Transmitter LED
●CD control section
12. Disc Number Select Buttons
13. Track Down/Review Button
14. Track Up/Cue Button
15. Disc Skip Button
16. Play/Repeat Button
17. Stop Button
18. Memory Button
19. Clear Button
10. Random Button
11. Pause Button
●Tuner control section
12. Preset Up/Down Buttons
●Tape control section
13. (TAPE 2) Record Pause Button
14. (TAPE 2) Reverse Play Button
15. (TAPE 1) Play Button
3 (TAPE 2) Forward Play Button
16. (TAPE 1/2) Stop Button
17. (TAPE 2) Fast Wind Buttons
●Common section
18. 3D Surround Pass Button
19. Equalizer Mode Button
20. Function Selector Buttons
21. Balance Control Buttons
22. On/Stand-by Button
23. Dimmer Button
24. 3D Surround Mode Button
25. Extra Bass Button
26. Volume Up/Down Buttons
1
2
3
4
10
13
89 11
5
6
7
15
16
17
24
25
20
21
22
23
12
14
18
19
26

– 7 –
CD-C449W/K449W
OPERATION MANUAL
SETTING THE CLOCK
1 Press the ON/STAND-BY button to enter the stand-by mode.
2 Press the CLOCK button.
3 Within 5 seconds, press the MEMORY button.
4 Turn the jog dial to select the time display mode.
"0:00" → The 24-hour display will appear.
(0:00 - 23:59)
"AM 12:00" →The 12-hour display will appear.
(AM or PM 12:00 - 11:59)
"AM 0:00" →The 12-hour display will appear.
(AM or PM 0:00 - 11:59)
●Note that this can only be set when the unit is first installed
or it has been reset (see page 28).
5 Press the MEMORY button.
6 Adjust the hour by turning the jog dial.
●When the jog dial is turned one click clockwise, the time will
increase by 1 hour. When it is turned one click anti-clockwise,
the time will decrease by 1 hour.
Keep turning the jog dial to change the time continuously.
●When the 12-hour display is selected, "AM" will change auto-
matically to "PM".
7 Press the MEMORY button.
8 Adjust the minutes by turning the jog dial.
●When the jog dial is turned one click clockwise, the time will
increase by 1 minute. When it is turned one click anti-clock-
wise, the time will decrease by 1 minute.
Keep turning the jog dial to change the time continuously.
●The hour setting will not advance even if minutes advance
from "59" to "00".
9 Press the MEMORY button.
●The clock starts operating from "0" seconds. (Seconds are not
displayed.)
Note:
●In the event of a power failure or when the AC power lead is
disconnected, the clock display will go out.
When the AC power supply is restored, the clock display will
flash on and off to indicate the time when the power failure
occurred or when the AC power lead was disconnected.
If this happens, follow the procedure below to change the clock
time.
To change the clock time:
When the unit is in the stand-by mode:
① Press the MEMORY button.
② Perform steps 6 - 9 above.
When the unit is on:
① Press the CLOCK button.
② Within 5 seconds, press the MEMORY button.
③ Perform steps 6 - 9 above.
To see the time display:
Press the CLOCK button.
●The time display will appear for about 5 seconds.
To change the time display mode:
① Perform steps 1 - 2 in the section "RESETTING THE MICRO-
COMPUTER", on page 28.
② Perform steps 1 - 9 above.
In this example, the clock is set for the 24-hour
(0:00) system.
Jog dial
ON/STAND-BY
CLOCK
MEMORY TUNING
( )
0:00 AM 12:00 AM 0:00
2
3
4
5
6
7
8
9

CD-C449W/K449W
– 8 –
■
FM/MW interval (span)
The International Telecommunication Union (ITU) has estab- lished that member countries should maintain either a 10 kHz or a 9 kHz interval between broadcasting frequencies of any MW 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 SELECTOR switch (on the rear panel) to MW tuning 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 to "50/9" for 9 kHz MW interval (50 kHz FM interval), and "100/10" for 10 kHz MW interval (100 kHz FM interval).
3
Press the ON/STAND-BY button whilst holding down the button and the FLAT button.
Caution: ●The operation explained above will erase all data stored in
memory including clock and timer settings, and tuner and CD presets.
FM/MW
(kHz)
50/9 100/10
SPAN
SELECTOR
RESETTING THE MICROCOMPUTER
Reset the microcomputer under the following conditions: ●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.
2
Press the ON/STAND-BY button whilst holding down the button and the FLAT button.
Caution: ●The operation explained above will erase all data stored in
memory including clock and timer settings, and tuner and CD presets.
ON/STAND-BY
FLAT
(Continued)
■
Remote control
●When inserting or removing the batteries, push them towards
the battery terminal.
●Installing the batteries incorrectly may cause the unit to mal-
function.
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 dam- age 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 control
and the sensor on the main unit with a soft cloth.
●Exposing the sensor on the main unit to strong light may in-
terfere with operation. Change the lighting or the direction of the unit.
●Keep the remote control away from moisture, excessive heat,
shock, and vibrations.
+-
-
+
15
15
●2 "AA" size bat-
teries (UM/SUM- 3, R6, HP-7 or similar)
0.2 m - 6 m (8" - 20')

– 9 –
CD-C449W/K449W
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 cover, and close.
(Note 1)
2. Hook....................... (C1) x3
3. Hook....................... (C2) x2
4. Screw ..................... (C3) x1
5. Socket .................... (C4) x3
4 Tuner PWB 1. Socket .................... (D1) x1 10-1
2. Screw ..................... (D2) x5
5 Rear Panel 1. Screw ..................... (E1) x11 9-2
................................... 10-1
6 Main PWB 1. Flat cable ............... (F1) x2 10-1
2. Flat wire ................. (F2) x3
3. Socket...................... (F3) x3
4. Screw....................... (F4) x3
7 Karaoke PWB 1. Screw ..................... (G1) x2 10-2
(CD-K449W only)
8 Front Panel 1. Flat wire ................. (H1) x1 10-2
2. Screw...................... (H2) x2
9 Power Amp. PWB 1. Socket .................... (J1) x2 10-2
2. Screw ..................... (J2) x6
10 Power Supply PWB 1. Screw ..................... (K1) x6 10-3
11 Display PWB 1. Knob....................... (L1) x2 10-4
2. Nut.......................... (L2) x1
3. Screw ..................... (L3)x12
12 CD Switch PWB 1. Screw ..................... (M1) x3 10-4
13 Headphones PWB 1. Screw ..................... (N1) x1 10-4
14 Tape Mechanism 1. Screw ..................... (P1) x6 10-4
15 Turntable 1. Screw ..................... (Q1) x1 10-5
2. Cover ..................... (Q2) x1
16 Disc Tlay 1. Screw ..................... (R1) x2 10-5
2. Guide ..................... (R2) x2
17 CD Servo PWB 1. Screw ..................... (S1) x1 10-6
(Note2) 2. Socket .................... (S2) x4
18 CD Changer 1. Screw ..................... (T1) x4 11-1
Mechanism
19 CD Mechanism 1. Screw ..................... (U1) x1 11-1
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 nylon bands or wire holderswherethey need to
beremovedwhendisassemblingtheunit.Afterservicing
theunit,be sure to rearrange the leadswherethey were
before disassembling.
4. Take suffcient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 9-2
Figure 9-3
CD-C449W/K449W
STEP REMOVAL PROCEDURE FIGURE
Figure 9-1
CD-C477W/K449W
LOCK
LEVER
CD Tray Cover
CD Player
Unit
( E1 ) x10
ø3 x8mm ( C3 ) x1
ø3 x8mm
Hook
( C1) x3
( C2 ) x1
( C4 ) x2
( C4 ) x1
Rear Panel
Main PWB
Front Panel
1
1
2
Tuner PWB
Pull
(C2) x1
( B1 ) x2
ø3 x8mm
( B1 ) x4
ø3 x8mm ( B1 ) x2
ø3 x8mm
Top Cabinet
Side Panel
(Right)
Rear Panel
Side Panel
(Left)
( A1 ) x2
ø3 x12mm
( A1 ) x2
ø3 x12mm
Note 1:
How to open the changer manually. (Fig. 10-3)
1. Then, turn fully the lock lever in the arrow direction through
the hole on the loading chassis bottom in this state.
After that, push forward the CD player base.
2. Afterremovingtheconnectorfortheopticalpickupfromthe
connector wrap the conductive aluminium foil around the
front end of connector so as to protect the optical pickup
from electrostatic damage.