Sharp CDK-491-W Service manual

SERVICE MANUAL

Manufactured under license from Dolby Laboratories. "Dolby", "Pro Logic" and the double-D symbol are trademarks of Dolby Laboratories. Confidential Unpublished Works. ©1992-1997 Dolby Laboratories, Inc. All rights reserved.

CD-K491W

No.S0883CDK491W/

CD-K491W

CD-K491W mini component system consisting of CD-K491W mini component system, CP-K491, CP-SW491, centre (GBOXS0010AWM3) and surround (GBOXS0011AWM3) speaker system.

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

QSOUND and the QLogo are registered trademarks of QSound Labs, Inc.

QSound is protected under US Patent Nos. 5,105,462 and 5,208,860 and foreign counterparts.

CONTENTS

Page

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

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

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

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

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

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

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

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

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 16

TYPES OF TRANSISTOR AND LED................................................................................................................................16

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

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD............................................................................................. 22

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 52

TROUBLESHOOTING ..................................................................................................................................................... 53

FUNCTION TABLE OF IC................................................................................................................................................ 57

FL DISPLAY..................................................................................................................................................................... 68

REPLACEMENT PARTS LIST/EXPLODED VIEW

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-K491W

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 WITDOUT A COMPACT DISC IN POSITION AND THE

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 procedures other than those specified herein may result in hazardous radiation exposure.

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

Laser Diode Properties

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

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

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

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

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

VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD. STIRRA EJ IN I STRALEN OCH BETRAKTA EJ STRALEN GENOM OPTISKT INSTRUMENT. ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.

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.

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.

QACCA0001AW00

QACCE0008AW00

QACCJ0003AW00

QACCL0005AW00

QACCB0006AW00

92LPLUG027

Figure 2 AC POWER SUPPLY CORD AND AC PLUG ADAPTOR

– 2 –

92LPLUG155A

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

CD-K491W

SPECIFICATIONS

● General

Power source: AC 110/127/220/230 - 240 V,

50/60 Hz

Power consumption: 200 W Dimensions: Width; 270 mm (10-5/8")

Height; 316 mm (12-1/2") Depth; 343 mm (13-1/2")

Weight: 10.5 kg (23.2 lbs.)

● Amplifier section

Output power: PMPO; 2,000 W (total)

Front speakers;

MPO; 142 W (71 W + 71 W)

(10 % T.H.D.)

RMS: 80 W (40 W + 40 W)

(10 % T.H.D.)

Centre speaker;

MPO; 71 W

(10 % T.H.D.)

RMS: 40 W

(10 % T.H.D.)

Surround speakers;

MPO; 142 W (71 W + 71 W)

(10 % T.H.D.)

RMS: 80 W (40 W + 40 W)

(10 % T.H.D.)

Sub woofer;

MPO; 71 W

(10 % T.H.D.)

RMS: 40 W

(10 % T.H.D.)

Output terminals: Front speakers; 8 ohms

Centre speaker; 8 ohms Surround speakers; 8 ohms Sub woofer; 8 ohms Monitor; 1 Vp-p/75 ohms Headphones; 16 - 50 ohms (recommended; 32 ohms)

Input terminals: DVD 1 (Digital); Optical

DVD 2 (Digital); Coaxial VCR 1/AUX 1; 500 mV/47 kohms VCR 2/AUX 2; 500 mV/47 kohms DVD 1/VCR 1; 1 Vp-p/75 ohms DVD 2/VCR 2; 1 Vp-p/75 ohms Microphone 1/2; 1 mV/4.7 kohms

● 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: 100 dB (1 kHz)

CP-K491

● Front speaker section

Type: 3-way, 130 mm (5-1/8") woofer,

50 mm (2") tweeter and super tweeter

Maximum input power: 80 W Rated input power: 40 W Impedance: 8 ohms Dimensions: Width; 220 mm (8-11/16")

Height; 316 mm (12-1/2") Depth; 284 mm (11-3/16")

Weight: 3.4 kg (7.5 lbs.)/each

GBOXS0010AWM3

● Centre speaker section

Type: 2-way, 120 mm (4-3/4") woofer

and 50 mm (2") tweeter

Maximum input power: 80 W Rated input power: 40 W Impedance: 8 ohms Dimensions: Width; 270 mm (10-5/8")

Height; 142 mm (5-5/8") Depth; 220 mm (8-11/16")

Weight: 1.8 kg (4.0 lbs.)

GBOXS0011AWM3

● Surround speaker section

Type: 2-way, 100 mm (4") woofer and

50 mm (2") tweeter

Maximum input power: 80 W Rated input power: 40 W Impedance: 8 ohms Dimensions: Width; 200 mm (7-7/8")

Height; 134 mm (5-5/16") Depth; 240 mm (9-1/2")

Weight: 1.4 kg (3.1 lbs.)/each

CP-SW491

● Sub woofer section

Type: 160 mm (6-1/2") woofer Maximum input power: 80 W Rated input power: 40 W Impedance: 8 ohms Dimensions: Width; 220 mm (8-11/16")

Height; 316 mm (12-1/2") Depth; 294 mm (11-5/8")

Weight: 3.8 kg (8.4 lbs.)

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

– 3 –

CD-K491W

NAMES OF PARTS

■ Front panel

1. Disc Tray

2. Disc Number Selector Buttons

3. Disc Skip Button

4. Open/Close Button

5. Left Front Speaker Indicator

6. LFE Indicator

7. Centre Speaker Indicator

8. Right Front Speaker Indicator

9. Dolby Pro Logic Indicator

10. Dolby Virtual Indicator

11. Left Surround Speaker Indicator

12. Surround Signal Indicator

13. Sub Woofer Indicator

14. Right Surround Speaker Indicator

15. Dolby Digital Indicator

16. (CD) Disc Number Indicator

17. (TAPE) Direction Indicator

18. (CD) Play Indicator

19. (CD) Repeat Play Indicator

20. (CD) Pause Indicator

21. (TAPE) Record Indicator

22. (TAPE) Reverse Mode Indicator

23. Spectrum Analyzer Indicator

24. (TUNER) FM Stereo Indicator

25. (TUNER) FM Stereo Mode Indicator

26. Karaoke Maker Indicator

27. Timer Record Indicator

28. (CD) Random Play Indicator

29. Extra Bass Indicator

30. Timer Play Indicator

31. Sleep Indicator

32. (CD/TUNER) Memory Indicator

1

6

5

1213 14

11

89

7

234

16

30

15

24

25

26

10

18 192021 22

27

23

31

28

17

29

32

33. Function Selector Buttons

34. Surround Mode Selector Buttons

35. Equalizer Selector/Demo Mode Button

36. Extra Bass Button

37. Volume Control

38. On/Stand-by Button

39. Headphone Socket

40. Karaoke Maker Switch

41. Microphone Sockets

42. Microphone Level Controls

43. Digital Echo Control

– 4 –

33

39 41 43

38

34 35

40

42

36 37

62 63

VIDEO OUT

MONITOR

SPAN

SELECTOR

FM/MW(kHZ)

50/9

100/10

1

234

5

67

8

10 11

13

15 16

17 18

9

12

14

44 45

46 47 48 49 50 51

52

53 54 55

56

57 58 59 60

61

44. Clock Button

45. Sleep Button

46. Reverse Mode Button

47. CD Pause Button

48. Jog Dial

49. (CD/TAPE) Stop Button

50. Record Pause Button

51. Menu Button

52. Item Button

53. Timer Button

54. Memory Button

55. Clear Button

56. (CD) Track Down/Review Button

57. (TAPE 2) Reverse Play Button

58. (CD) Play/Repeat Button

59. (CD) Track Up/Cue Button

60. (TAPE) Normal Edit Button

61. (TAPE) High Edit/Beat Cancel Button

(TAPE 2) Fast Wind Button (TUNER) Tuning Down Button

(TAPE 1) Play Button (TAPE 2) Forward Play Button

(TAPE) Fast Wind Button (TUNER) Tuning Up Button

CD-K491W

62. (TAPE 1) Cassette Compartment

63. (TAPE 2) Cassette Compartment

■ Rear panel

1. DVD 1 Digital Input Socket (Optical)

2. DVD 2 Digital Input Socket (Coaxial)

3. DVD 1/VCR 1 Video Input Socket

4. DVD 2/VCR 2 Video Input Socket

5. Video Output Socket

6. CD Digital Output Socket (Optical)

7. VCR 1/AUX 1 Input Socket

8. VCR 2/AUX 2 Input Socket

9. Span Selector Switch

10. 75 Ohm FM Aerial Socket

11. Aerial Earth Terminal

12. SW1/SW2/MW Aerial Terminal

13. AC Voltage Selector

14. AC Power Lead

15. Front Speaker Terminals

16. Centre Speaker Terminals

17. Surround Speaker Terminals

18. Sub Woofer Terminals

– 5 –

CD-K491W

CP-K491 CP-SW491

Front speakers

1. Super Tweeter

2. Tweeter

3. Woofer

4. Bass Reflex Duct

5. Speaker Terminals

Sub Woofer

1. Woofer

2. Bass Reflex Duct

3. Speaker Terminals

1 2

5

3

1

3

2

4

GBOXS0010AWM3

Centre speaker

1. Tweeter

2. Woofer

3. Speaker Terminals

1 2

■ Remote control

1. Remote Control Transmiter LED

2. Surround Mode Selector Buttons

3. Sub Woofer Level Control Buttons

4. Setup Up/Down Buttons

5. Menu Button

6. Item Button

● Tuner control section

7. Preset Up/Down Buttons

● CD control section

8. Track Up/Cue Button

9. Track Down/Review Button

10. Memory Button

11. Disc Skip Button

12. Stop Button

13. Play/Repeat Button

14. Pause Button

15. Clear Button

16. Random Button

GBOXS0011AWM3

Surround speakers

1. Tweeter

2. Woofer

3. Speaker Terminals

1

3

2

3

1

2

7

3

5

6

10

4

8 9

15 16

17

18 19 20

11 12

13 14

● Tape control section

17. (TAPE 2) Record Pause Button

18. (TAPE 2) Reverse Play Button

19. Stop Button

20. (TAPE 1) Play Button (TAPE 2) Forward Play Button

21. (TAPE 2) Fast Wind Buttons

● Common section

22. Extra Bass Button

23. Equalizer Mode Button

24. Function Selector Buttons

25. On/Stand-by Button

26. Volume Control Buttons

27. Dimmer Button

– 6 –

22 23 24

25

21

26 27

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 42).

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 anticlockwise,

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 anticlockwise,

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:

➀ Press the MEMORY button.

➁ Perform steps 6 - 9 above.

When the unit is on:

➀ Press the CLOCK button.

➁ Within 5 seconds, press the MEMORY button.

➂ 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:

➀ Perform steps 1 and 2 in the section "RESETTING THE MI-

CROCOMPUTER", on page 42.

➁ Perform steps 1 - 9 above.

CLOCK

ON/

STAND-BY

MEMORY

TUNING

( )

Jog dial

In this example, the clock is set for the

12-hour (AM 12:00) system.

0:00 AM 12:00 AM 0:00

2

3

4

5

6

7

8

9

SPAN

SELECTOR

FM/MW(kHz)

50/9

100/10

(Continued)

■FM/MW interval (span)

The International Telecommunication Union (ITU) has established

that member countries should maintain either a 10 kHz or a 9

kHz interval between broadcasting frequencies of any MW sta-

tion. 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 EQUALIZER/DEMO button.

Caution:

● The operation explained above will erase all data stored in

memory including clock and timer settings, and tuner and CD

presets.

RESETTING THE MICROCOMPUTER

ON/

STAND-BY

EQUALIZER

/DEMO

Reset the microcomputer by performing the following

procedure for the cases shown below:

● To erase all of the stored memory contents, or

● If the display does not function properly, or

● The unit does not operate properly.

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 EQUALIZER/DEMO button.

Caution:

● The operation explained above will erase all data stored

in memory including clock and timer settings, and tuner

and CD presets.

(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.

Notes concerning use:

● Replace the batteries if control distance decreases or 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

0.2 m - 6 m

(8" - 20')

CD-K491W

– 7 –

CD-K491W

DISASSEMBLY

Caution on Disassembly

Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance:

1. Take cassette tape and compact disc out of the unit.

2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.

3. Take off nylon bands or wire holders where they need to be removed when disassembling the unit. After servicing the unit, be sure to rearrange the leads where they were before disassembling.

4. Take suffcient care on static electricity of integrated circuits and other circuits when servicing.

CD-K491W

STEP REMOVAL

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

2 Side Panel 1. Screw ..................... (B1) x8 8-1

(Left/right)

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

CD Tray Cover open the disc tray, take out

4 Dolby PWB 1. Flat cable ............... (D1) x2 9-1

5 Tuner PWB 1. Socket.................... (E1) x1 9-1

6 Rear Panel 1. Screw ..................... (F1) x11 8-2

7 Main PWB 1. Flat cable ............... (G1) x2 9-1

8 Karaoke PWB 1.Screw ...................... (H1) x3 9-2

9 Front Panel 1. Flat wire ................. (J1) x1 9-2

10

Power Amp. PWB

with Heat Sink 2. Screw ..................... (K2) x6

11

Power Supply PWB

12 Display PWB 1. Knob ....................... (M1) x2 9-4

13 CD Switch PWB 1. Screw..................... (N1) x3 9-4

14 Headphones 1. Screw ..................... (P1) x1 9-4

15 Tape Mechanism 1. Open the cassette Lid.

16 Turntable 1. Screw ..................... (R1) x1 9-5

17 Disc Tlay 1. Screw ..................... (S1) x2 9-5

18 CD Servo PWB 1. Screw ..................... (T1) x1 9-6

19 CD Changer 1. Screw ..................... (U1) x4 10-1

Mechanism

20 CD Mechanism 1. Screw ..................... (V1) x1 10-1

the CD cover, and close. (Note 1)

2. Hook....................... (C1) x3

3. Hook....................... (C2) x2

4. Screw ..................... (C3) x1

5. Socket .................... (C4) x3 8-2,9-1

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

3. Screw ..................... (D3) x12

2. Screw ..................... (E2) x5

2. Flat wire .................

3. Socket...................... (G3) x5

4. Screw....................... (G4) x3

2. Screw...................... (J2) x2

1. Socket .................... (K1) x3 9-2

1. Screw ..................... (L1) x6 9-3

2. Nut.......................... (M2) x1

3. Screw ..................... (M3) x12

2. Screw ..................... (Q1) x6 9-4

2. Cover ..................... (R2) x1

2. Guide ..................... (S2) x2

2. Socket .................... (T2) x4

PROCEDURE

................................... 9-1

(G2) x3

FIGURE

( B1 ) x2 ø3 x8mm

Side Panel (Right)

( B1 ) x4 ø3 x8mm

CD Player Unit

( C3 ) x1 ø3 x8mm

CD-K491W

( A1 ) x2 ø3 x12mm

Rear Panel

( C4 ) x2

( F1 ) x10 ø3 x8mm

LOCK LEVER

(C2) x1

Pull

Figure 8-1

CD Tray Cover

Rear Panel

Figure 8-2

Top Cabinet

( A1 ) x2 ø3 x12mm

Side Panel (Left)

( B1 ) x2 ø3 x8mm

Hook ( C1) x3

1

1 2

( C2 ) x1

Front Panel

Main PWB

Tuner PWB

Note 1:

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

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.

Figure 8-3

– 8 –

CD-K491W

(D1) x1

(F1) x1 ø3 x10mm

(C4) x1

(D2) x1

(D3) x8 ø3x10mm

(E2) x1 ø3x10mm

(D3) x4 ø3x10mm

Rear Panel

(H1)x2 ø3x10mm

Karaoke PWB

Dolby PWB

(D1) x1

(G3)

(G3) x1

(G2) x1

@

x2

(G1) x2

(G2) x2

(E1) x1

Tuner PWB

Figure 9-1

(G4) x2 ø3x10mm

Front Panel

(E2) x4 ø3 x10mm

Front Panel

(G3) x2

Main PWB

(G4) x1 ø3x10mm

Front Panel

(N1)x3 ø3x10mm

(M3)x12 ø3x10mm

Tape Mechanism

CD Switch PWB

(Q1)x6 ø3x10mm

Figure 9-4

( R1 ) x1 ø3 x10mm

( R2 ) x1

(M1)x2

Washer

(M2)x1

Display PWB

Headphones PWB

Open

(P1)x1 ø3x10mm

Cassette Holder (Left/Right)

(H1)x1 ø3x10mm

(K2)x5 ø3x10mm

(L1)x4 ø4x8mm

Power Supply PWB

( K1 ) x1

Power Amp. PWB

Figure 9-2

( K2 ) x1 ø3x10mm

(L1)x1 ø3x10mm

(K1 ) x2

(J1 ) x1

( J2 ) x2 ø3x10mm

( S1 ) x1 ø3 x10mm

( S2 ) x1

( T2 ) x2

CD Player Unit

Turntable

Disc Tray

( S1 ) x1 ø3 x10mm

( S2 ) x1

Figure 9-5

( T1 ) x1 ø3 x10mm

CD Servo PWB

(L1)x1 ø3x10mm

Figure 9-3

( T2 ) x2

CD Player Unit

Figure 9-6

– 9 –

CD-K491W

( U1 ) x4 ø3 x12mm

( V1 ) x1 ø2.6 x10mm

Shift Lever

CD Changer Mechanism

CD Player Base

CD Mechanism

Be careful when installing the CD changer mechanism. Install the CD changer mechanism on the CD player base after the shift lever has been set in the highest position.

Figure 10-1

CP-K491

STEP REMOVAL

1 Front Speaker 1. Net.......................... (A1) x1 10-2

2. Baffle Board ........... (A2) x1

3. Screw ..................... (A3) x2

4. Screw ..................... (A4) x4

5. Screw ..................... (A5) x2

PROCEDURE

FIGURE

CP-K491

Tweeter

Baffle Board

(A2)x1

Net

(A1)x1

Woofer

Screw driver

Super

Tweeter

(A5)x2

ø3x10mm

Tweeter

(A3)x2

ø3x10mm

CP-SW491

STEP REMOVAL PROCEDURE FIGURE

1 Sub woofer 1. Net.......................... (A1) x1 10-3

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

3. Screw ..................... (A3) x4

Note:

The center and rear speakers can be easily disassembled. Therefore the disassembling method is not discribed. For details refer to the disassembling drawing in the Parts Guide.

(A4)x4

ø4x16mm

Woofer

Figure 10-2

CP-SW491

Net ( A1 ) x1

( A3 ) x4 ø4 x16mm

Woofer

– 10 –

( A2 ) x1

Screwdriver

Figure 10-3

REMOVING AND REINSTALLING THE MAIN PARTS

( A1 ) x2 ø2.6 x5mm

Loading/Up/ Down Motor

Motor PWB

CD MECHANISM SECTION

Perform steps 1, 2, 3,16, 17, 18, 19 and 20 of the disassembly method to remove the CD mechanism.

How to remove the loading motor (See Fig. 11-1)

1. Remove the screws (A1) x 2 pcs., to remove the loading motor.

How to remove the pickup (See Fig. 11-2)

1. Remove the screws (B1) x 2 pcs., to remove the shaft (B2).

2. Remove the stop washer (B3) x 1 pc., to remove the gear (B4).

3. Remove the pickup.

( B1 ) x2 ø2.6 x6mm

CD-K491W

Figure 11-1

Stop Washer ( B3 ) x1

Pickup

Shaft ( B2 ) x1

CD Mechanism Gear ( B4 ) x1

Figure 11-2

– 11 –

CD-K491W

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter

Play: TW-2412 Tape 1: Over 80 g

• Torque Check

Torque Meter

Tape 1

Play: TW-2111 30 to 60 g. cm 30 to 100 g.cm Fast forward: TW-2231 — 50 to 100 g.cm Rewind: TW-2231 — 50 to 100 g.cm

• Tape Speed

Test Tape

Normal MTT-111 VRM01 3,000 ± Speaker speed 30 Hz terminal

Adjusting

Point

Specified Value

Tape 2: Over 80 g

Specified Value

Specified

Value

Tape 2

Instrument

Connection

(Load resistance: 8 ohms)

TUNER SECTION

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

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage

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

Coverage 1.1 ± 0.1 V SW1 Band — 3.2 MHz (fL): T307 *2

Coverage 2.0 ± 0.1V SW1 Band — 7.3 MHz (fH): TC305 *2

Coverage 7.7 ± 0.2 V SW2 Band — 9.5 MHz (fL): T308 *2

Coverage 2.1 ± 0.1V SW2 Band — 21.85 MHz (fH): TC304 *2

Coverage 7.7 ± 0.2V MW 990 kHz 990 kHz T302 *1

Tracking SW1 3.9 MHz 3.9 MHz (fL): T303 *1

Tracking SW1 7.1 MHz 7.1 MHz (fH): TC303 *1

Tracking SW2 11.65 MHz 11.65 MHz (fL): T304 *1

Tracking SW2 21.45 MHz 21.45 MHz (fH): TC302 *1

Tracking

Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

TAPE MECHANISM PWB

VRM01

TAPE

FAS SW

Figure 12

SPEED

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

– 12 –

• FM RF

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

Test Stage

Band — 87.5 kHz (fL): LT02 *1 Coverage 3.7 ± 0.1 V

RF 98 MHz 98 MHz LT01 *2

*1. Input: Antenna, Output: TP301 *2. Input: Anetnna, Output: Speaker Terminal

Frequency

10 - 30 dB

Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

• Setting the Test Mode

Keeping the PAUSE button and TUNER button pressed, turn on POWER. Then, the frequency is initially set in the memory as shown in Table. Call it with the PRESET button to use it for adjustment and check of tuner circuit.

Preset

No.

21 ~ 40

FM Preset

1 87.50 MHz 6 531 kHz 11 3.2 MHz 16 9.5 MHz 2 108.00 MHz 7 1,602 kHz 12 7.3 MHz 17 21.85MHz 3 90.00 MHz 8 603 kHz 13 3.9 MHz 18 11.65 MHz 4 106.00 MHz 9 1,404 kHz 14 7.1 MHz 19 21.45 MHz 5 98.00 MHz 10 990 kHz 15 5.06 MHz 20 15.1 MHz

No.

MW

Preset

No.

SW1

Preset

No.

SW2

CD-K491W

• FM Detection

Signal generator: 10.7 MHz, FM sweep

Test Stage

IF 10.7 MHz 98 MHz TT01 *1

*1. Input: Antenna, Output: TP301 *2. Input: Anetnna, Output: Speaker Terminal

• FM Mute Level

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

Frequency Adjusting

98.00 MHz 98.00 MHz VR351 *1 Input: Antenna (25 dBµV) Output: Speaker

*1. Adjust so that an output signal appears.

Frequency

Display

Frequency

Display

Setting/

Adjusting

Parts

(Turn the core of transformer TT01 fully counterclock wise)

Parts

Instrument

Connection

Instrument

Connection

Terminal

R357

TUNER PWB

T351

AM IF

IC303

TP302

VR351

FM Mute Level

fL fH

SW2 Coverage

SW1 Band Coverage

fL fH

T307 TC305

T308 TC304

FM Band Coverage

LT02

T306

MW Band Coverage

FM IF FM RF

TT01

TP301

LT01

SW2 Tracking

fH fL

T304TC302

T303TC303

T302

MW Tracking

SO301 ANTENNA TERMINAL

fH fL

SW1 Tracking

Figure 13 ADJUSTMENT POINTS

– 13 –

CD-K491W TEST MODE

• Setting the test mode Any one of test mode can be set by pressing several keys as follows. <CD> + <EQ> + <POWER> TEST: CD operation test

• TEST mode

Function — CD test mode

Setting of TEST mode Indication of CD TST mode (Fig. 14-1) OPEN/CLOSE operation is manual operation. The pickup can be moved by using the (

LASER ON

<MEMORY> Tracking on the spot. SERVO OFF PLAY

) or ( ) key.

<MEMORY> Tracking on the spot. SERVO ON PLAY

IL is not performed.

<STOP>

STOP

<PLAY> key input

TOC. IL is performed, and the ordinary PLAY is performed. If the following key is pressed during PLAY, it is possible to specify directly any Track No. <Disc Number 1> key: Track 4 <Disc Number 2> key: Track 9

Press <STOP> key.

Stop

<Disc Number 3> key: Track 15

Note:

Only in STOP state it is possible to slide the pickup with the ( ) or ( ) key. VOL. --- Last memory

BAL. --- CENTER R.GEQ. --- FLAT X-BAS --- OFF

Canceling method - POWER OFF

Figure 14-1

CD SECTION

Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary to readjust it. Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.

• Automatic adjustment item

1. Focus offset (Fig. 14-2)

2. Tracking offset (Fig. 14-3)

3. E/F balance (tracking error balance) (Fig. 14-4)

4. RF level AGC function (HF level: constant)

5. RF level automatic follow-up of the tracking gain This automatic adjustment is performed each time a disc is changed. Therefore,

each disc is played back using the optimal settings.

0.1s

0.50 V IC1 20 FE

0.1s

0.50 V IC1 7 TE

FOCUS OFF-SET ADJUST

TRACKING OFF-SET ADJUST

1 2

10ms

0.50 V IC1 20 FE

10ms

0.50 V IC1 7 TE

Figure 14-2

200 ms 1V/diV IC 1 15

200 ms 1V/diV IC 1 7

TO

TE

TRACKING/ ERROR BARANCE

1

ADJUST

2

Figure 14-4

– 14 –

Figure 14-3

Enlarged View

TRACKING OFF-SET ADJUST

1 2

DVD 1 /VCR 1

DVD 2 /VCR 2

DVD 1 /VCR 1

DVD 2 /VCR 2

When you connect this unit to a DVD player which is playing a disc with the trademark, you can enjoy realistic, powerful sound by playing back the recorded signal through 6 speakers with the sound coming from the front left, front right, centre, surround left, surround right and sub woofer speakers.

To listen to a disc using the Dolby Digital mode:

1

Connect a DVD player. (See page 39.)

2

Press the DVD 1/VCR 1 or DVD 2/VCR 2 button to select "DVD 1" or "DVD 2".

3

Start the DVD player.

Note:

● When the Dolby Digital surround mode is being used, the equalizer will be set to FLAT.

Type of Dolby digital signal

There are different types of Dolby digital signals. The type of Dolby digital signal being input into this unit can be checked in the display.

Display Channels available Display Channels available

Normal PCM playback Front (L, R) + surround

(L, R)

Centre only (monaural) Front (L, R) + centre

Front (L, R) (When the surround mode is set to Normal or Phantom, sound will also be heard from the surround speakers.)

Front (L, R) + centre + surround (monaural)

Front (L, R) + surround (monaural)

Front (L, R) + centre + surround (L, R)

● If a low frequency sound effect (Low Frequency Effect) contains a Dolby digital signal, "LFE" will light in the display. When this "LFE" is lit, low frequency signals will be output from the sub woofer.

DOLBY DIGITAL

SURROUND EFFECT CONTROL

This product allows you to enjoy 4 surround modes.

Normal mode:

When you play a sound source that has the (5.1 channels) or trademarks, you can enjoy surround sound using all 6 speakers.

Phantom mode:

When you play a sound source that has the or trademarks, you can enjoy surround sound using 5 speakers, but not the centre speaker.

Virtual Dolby Surround:

You can enjoy a three-dimensional surround stereo image using just the 2 front speakers.

Enhanced Virtual Surround:

You can enjoy surround sound, using only the 2 front speakers, but this mode increases the three-dimensional stereo image effect even more.

CD-K491W

– 15 –

CD-K491W

NOTES ON SCHEMATIC DIAGRAM

• Resistor: To differentiate the units of resistors, such symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with “Fusible” is a fuse type.

• Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means micro-micro-farad and the unit of the capacitor without such a symbol is microfarad. As to electrolytic capacitor, the expression “capacitance/withstand voltage” is used. (CH), (TH), (RH), (UJ): Temperature compensation (ML): Mylar type (P.P.): Polypropylene type

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

REF. NO DESCRIPTION POSITION POSITIONREF. NO DESCRIPTION

SW1 OPEN/CLOSE ON—OFF SW2 MECHA UP ON—OFF SW3 DISC NUMBER ON—OFF SW4 PICKUP IN ON—OFF SW991 VOLTAGE SELECTOR 230-240V SWD01 VOLUME JOG ON—OFF SWD02 JOG ON—OFF SWD03 X-BASS ON—OFF SWD04 PRE EQ. ON—OFF SWD05 MENU ON—OFF SWD06 ITEM ON—OFF SWD12 TUNING UP/CUE ON—OFF SWD13 STOP ON—OFF SWD14 NORMAL EDIT ON—OFF SWD15 HIGH EDIT ON—OFF SWD16 REC/PAUSE ON—OFF SWD17 F-PLAY ON—OFF SWD23 QSOUND ON—OFF SWD26 VIRTUAL ON—OFF SWD27 PHANTOM ON—OFF SWD28 NORMAL ON—OFF SWD29 BYPASS ON—OFF SWD30 TUNING DOWN/REWIND ON—OFF SWD31 CD PAUSE ON—OFF

• The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chassis with no signal given.

1. In the tuner section,

( ) indicates AM < > indicates FM stereo

2. In the main section, a tape is being played back.

3. In the deck section, a tape is being played back.

( ) indicates the record state.

4. In the power section, a tape is being played back.

5. In the CD section, the CD is stopped.

• Parts marked with “ ” ( ) are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

SWD32 REVERSE MODE ON—OFF SWD33 R-PLAY ON—OFF SWD34 CLOCK ON—OFF SWD35 MEMORY ON—OFF SWD36 TIMER ON—OFF SWD37 SLEEP ON—OFF SWD38 CLEAR ON—OFF SWD39 DVD/VIDEO 1 ON—OFF SWD40 DVD/VIDEO 2 ON—OFF SWD41 TAPE 1/2 ON—OFF SWD42 TUNER/BAND ON—OFF SWD43 CD ON—OFF SWD48 POWER/STAND-BY ON—OFF SWD49 KARAOKE ON—OFF SWD50 DISC 1 ON—OFF SWD51 DISC 2 ON—OFF SWD52 DISC 3 ON—OFF SWD53 DISC SKIP ON—OFF SWD54 OPEN/CLOSE ON—OFF SWF02 SPAN SELECTOR 50/9 SWM3 REC FWD ON—OFF SWM4 REC RVS ON— OFF SWM5 F.A.S ON—OFF SWM6 CAM ON—OFF

2SC1845 F 2SC2236 Y 2SC2878 A 2SC2878 B 2SC535 C 2SD468 C KRA102 M KRA107 M KRC102 M

FRONT

E

(S)

(1)

VIEW

C (G) (2)

B

(D)

(3)

KRC104 M KRC107 M KTA1266 GR KTA1268 GR KTA1270 Y KTA1271 Y KTA1273 Y KTC3199 GR KTC3203 Y

FRONT

VIEW

FRONT

VIEW

B

C

E

(D)

(G)

(S)

(3)

(2)

2SD2012 2SB1375

(1)

SLR325MG SLR325VR KL052UL SLR505MC LMKD515B

Figure 16 TYPES OF TRANSISTOR AND LED

– 16 –

FRONT VIEW

KV1236Z23

2

FRONT

VIEW

3

1

KRA107 S KRC102 S KRC107 S

8

27

1

2

3

4

5

98

6

7

20

12

13

242530

31

3222

34

35

36

10 11

272628

29

PU-IN SW

XL1

XIN

LD0

FIN2

JP–

CV+

SLC

SL1

FIN1EF

TO

FD

SPO

NC

SLD

SL–

SL+

DRF

CL

DAT

CE

VCC1

6

+5V

PICKUP IN

SW4

FOCUS COIL

TRACKING COIL

M1

DISC

MOTOR

M

M2

SLIDE

MOTOR

PICKUP UNIT

9

IC2

LC78622K

SERVO/SIGNAL

CONTROL

+B1

IC3

M56748FP

DRIVER

IC1

LA9241M

SERVO AMP.

6

1

9

5

+B1

+12V(+B6)

RES. CQCK. COIN

SQOUT. RWC. WRQ

~

CL, DAT, SELIAL CONTROL/CE

Q93

Q91

SL+. SL–. DRF

7

3

9

8

7

6

5

4

3

2

1

GND (D)

MECHA UP

GND (D)

DISK NO.

OPEN/CLOSE

GND (D)M–M+

GND (M)

9

8

7

6

5

4

3

2

1

CNP10

M

+5V

+B8

62

64 45 3623 43

31

24

25

10 10

265853

101220

324043

44

5352515431302923271615

4144

Q1

Q52

+4.3V

Q81 +7.3V (+B8)

REGULATOR

TO MAIN SECTION

IC81

TA7291S

LORDING MOTOR

DRIVER

XOUT

EFMO

EFMIN

CLV+

JP–

CONT2

CONT1

CONT4

DOUT

VVDD

VDD

LVDD

RVDD

XVDD

SW1

OPEN/CLOSE

SW2

MECHA UP

SW3

DISC No.

M3

LOADING

SOLM1

TO MAIN

SECTION

CNS10

CD-K491W

Figure 17 BLOCK DIAGRAM (1/5)

– 17 –

CD-K491W

5

6

ANAROG RCH

TO MAIN SECTION

ANAROG LCH

LOW PASS FILTER &

DIFFERENTIAL AMP

2

IN

A-GND

2 1

IN

A-GND

LOW PASS FILTER &

DVD2

DIGITAL

IN

JA11

DVD2

DIGITAL

IN

FROM CD UNIT

ICA12

NJM4580M

+B7

8

4

+B7

8

4

IN

1

6

AINR–

OUT

AINL–

IN

6

ICA11

NJM4580M

DIFFERENTIAL AMP

TOS

ICA14

GP1F38R

ICA15

TC74HCU04

INVERTER

IN

1 4

IN

13

14

7

+B13

D4-GND

OUT

7

6

8

10

AINL+

OUT

AINR+

3

AINR–

4

AINL+

5

AINL–

6 2 8

18 19

20 22

25

A-GND

ICA16

TC74HCU15

SWITCH

IN

3

IN

4

IN

5 8

1

D4-GND

11

6

ICA13

1

7

~

13

PWDA

PWAD

23

24

16 17 15 11 12 13

A/D,D/A

AK4520A

14

CONVERTER

27 26

21

10

9

+B13+B9

14

D-OUT

7 9 2

+B13

16

15

DEM0 DEM1 SCK CLK CLK2L/R SL/SR IN D-OUT

LS OUT RS OUT

DGTL2

DGTL1

DGTL2

V1/V2

D-IN

SL/SR OUT

83

79

61

36

4

D3-GND

CLK2L/R OUT

CLK2OUT

9

97

92

91

85

62

8

60

JH51 VIDEO1 IN

VIDEO2 IN

MONITOR

OUT

QH51

+B7

ICH51

NJM2246M

SWITCH

1

3

7

2

4

8

6

+B7

V-GND

Figure 18 BLOCK DIAGRAM (2/5)

– 18 –

SWITCHING

DGTL2

QH53

QH52

SWITCHING

V1/V2

DGTL2

V1/V2

LS/RS

OUT

CLK2L/R

OUT

TO MAIN SECTION

SSSOSCK SIDEMO1

DEMO0

AC3 RESET

SUB

ON/OFF

WOOFER

CD-K491W

AD RESET

+B12

97

1

62

0

SCK CLK CLK2L/R

CLK2OUT

SCK2IN

95

66

92

94

85

86

44

53

29

19

8

2

37

GND

65

ICA18

ZR38600

DOLBY AC-3 /5.1

MPEG2 AUDIO

DECORDER

48

78

90

5

30

12

17

6

D3-GND

68

71

VDD

45

35

+B13

SSSORESET

34

82

87

3

70

55

59

67

FL/FR OUT

SCK

SI

80

89

54

93

81

84

ICB01

NJM4580M

MIX AMP

CENTER

SUB

WOOFER

OUT

L

1

7

R

SUB

WOOFER

ON/OFF

SWITCHING

+B7

8

3 5

4

IN

–B12

QA01 QA02

QA03

MIX

SUB

WOOFER

OUT

A-GND

SUB

WOOFER

FL/FR

12 13

10

2 9

14

+B12

5

CENTER WOOFER

6

7

–B12

FL/FR

SUB

PD

6

DEM0

12

DEM1

13

XT1

5

LRCK

9 7

8

ICA19

1

3

BICK

IN

D3-GND

PD

6

DEM0

12

DEM1

13

XT1

5

LRCK

9

BICK

ICA20

7 8

IN

1 3

D3-GND

ICA21

NJM4580M

–15dB AMP

4 1

8

11

7

ICA22

BU4066BCE

SWITCH

16 20 22

2

14

D/A

15

AK4321

24

CONVERTER

18 17

11

21

10

A-GND

16 20 22

2

14

D/A

15

AK4321

24

CONVERTER

18 17

11

10

21

A-GND

+B7

8

5

4

–B12

FL FR

OUT

+B12

CENTER

SUB

WOOFER

SUB

WOOFER

IN

TO MAIN SECTION

SUB

WOOFER

OUT

FL/FR

OUT

CENTER

OUT

Figure 19 BLOCK DIAGRAM (3/5)

– 19 –

+B12

+B13

VOLTAGE

REGURATER

VOLTAGE

REGURATER

QB01

VOLTAGE

REGURATER

UN-SWITCHED

–B6–B12

+B7

+B9

CD-K491W

4

1

RIN

PASS FILTER

SO301

ANTENNA

TERMINAL

FM

GND

SW1 SW2

MW

T302

MW ANT.

FM BAND

BFT01

231

MW OSC.

T306

1

TA7358AP

FM FRONT END

38

5

FM

LT01

SW1/SW2 ANT.

T303 T304

Q308 Q309

ICT01

RF

LT02

T307 T308

FM

OSC

SW1/SW2 OSC.

QT01

Q306 Q307

7

6

9

AMP

SW1 +B SW2 +B

FM +B

MW +B

FM IF TT01

Q360

Q362

FMOSC

+B7

FM IF CF302

FM IF IN

VR351

FM MUTE LEVEL

X352

4.5MHz

FM

7

20

+B7

Q363

+B7

AM IF

T351

321 REGOUT

FM IF DET./FM MPX./AM IF

AM OSC

IN

AFC

OUT

AM IN

1

OSC

LC72131

PLL CONTROLLER

9

+B7

Q364

7

STEREO

AM RF IN

FM IN

IC302

CE

AM IF CF352

IC303

LA1832

FM MONO/ST MONO/ST

1011161522

43

5

DI

CL

4

IN

IF OUT

IF IN

2113

6

DO

FM IF

CF351

GND

VOLTAGE

REGURATER

+B7

+12V

1712

VCC

985

Q361

8

+B7

X351

456KHz

17

16

18

OUT

IN

SD

1561412101321222324

RL

MUTING

Q353 Q354

ICH11

MOTOR

DRIVE

8

+B7

ICH11

MOTOR

DRIVE

4

-B6

7

2

SPE IN

6

1

JR11

VCR/AUX1

JR12

VCR/AUX2

TAPE 1

TAPE 2

L

MM1

TAPE

MOTOR

SWM3

REC FWD

SWM6

CAM SW

SWM5

T1 RUN2SW

SWM4

REC REV

SWM1

T1 CrO

SWM2

T2 CrO

SOLM1

SOLENOID

PB HEAD

REC/PB

M

L-CH R-CH

HEAD L-CH R-CH

R

PHM1

2

ERASE

HEAD

MOTOR DRIVER

+B6

P.B

+B2

QL14

SPEED

DRIVER

REC

AC BIAS

DRIVER

VRM1 TAPE

QL15 QL19

P.B

QK03 QK05 QK04 QK06 QK17 QK18

DRIVER

REC/PB

QK09

QK10

QL18

QL12

QL13

SWITCHING

QL17

QL11

QL16

T1/T2 SOLENOID

PLAYBACK&RECORD AMP

L(T1)

R(T1) L(T2) R(T2)

L NF

R NF

POP REDUCE

L REC R REC

QK07

REF

QK08

+B7

QK11

QK28

LK04

QK31 QK32

BIAS OSC.

TA MOT SW

HI SPEED

TA MOT H/L

T22RUN

T2 FWD-REC

CAM SW

2

T1/T2 CrO

T2 REV-REC

2

T1 Cr0

T2 Cr0

2

ICK01 AN7345K

1

P.B.

24

2

23

3 4

T1/T2

H/N

6

REC

9

16 14 13

NOR/

T1/T2

12

HIGH

15 19

P.B

L

4

21

R

5

20

L R REC

7

18

8

17

ALC

10

SWITCHING

QK25

QK13 QK14

L NF R NF

SWITCHING

2

Cr0

TC4052BF

DUAL 4CH ANALOG

MULTIPLEXER

PB MUTE

QK17 QK18

MUTING

REC MUTE

QK21 QK22

MUTING

SWITCHING

HI SPEED

QK15 QK16

QK19

SWITCHING

BAIS

QK26QK24

QK27

BEAT CHANCEL

ICZ08

T1/T2

REC/PB

Cr0

TUNER

TAPE

VCR 1

VCR 2

PB-EQ

BAIS

2

FUNC-A

10

L

12

1

R L

14

R

5

L

15

2

R L

11

4

R

7

–B10

LEVEL SHIFT

QK29 QK40

SWITCHING

QK30

QZ03 QZ04

FUNC-B

9

L

13

3

R

16

+B10

ICZ09

NJM4565M

LINE AMP.

–B10

L

R

IN

3

5

4

8

+B10

1

7

OUT

L

R

TO DOLBY SECTION

QG04

J602

MIC2

J602

MIC1

DET

VOICE C

MIC

1

IN

6

MIC2 IN MIC SW

31

MIC1

VOL IN

5

VR602

MIC2

VOLUME

33 34

Q631

VOLTAGE

REGULATOR

19 18

VCCMIC

IC601

M65845FP

MIC AMP.

MIC2

VOL IN

10 25

VR601

MIC1

VOLUME

+B7

GND

OUT

ECHO

VOL IN

VR603

DIGITAL ECHO

VOLUME

26

IN

27

L

29 28

R

L-OUT

20

40

L-IN

Figure 20 BLOCK DIAGRAM (4/5)

– 20 –

CD-K491W

F1

1

7

5

VEE

SWD01

JOG SW

–VP

QV18

QX13 QX14 QY51

F995

F997

T2.5A L 250V

F998

T1.6A L 250V

VOLTAGE REGULATOR

VF2 (AC)

SWD02

QX51

F1

F2 F2

QV19

RLYX11 RLYY51 RELAY

TRANSFORMER

FD01

+B2

RXD01

REMOTE

STB

RES

SCK

10

8

9

S-MUTE

S-W RELAY

CENTER RELAY

SURROUND RELAY

C-MUTE

SR-MUTE

SW-MUTE

QR11

QR13

QR12

QP13 QP14 QP15

VOLTAGE

REGURATER

VOLTAGE

REGULATOR

Q903

VOLTAGE

REGULATOR

Q902 Q901

Q906 Q905

Q904

SWITCHING

VOLTAGE

REGULATOR

Q909 Q908

SENSOR

RES STB

DAT

COM

SCK

RES

99

CQCK

5

COIN

3

SQ OUT

4

WRQ

11

RWC

100

CD SL+

2

CD SL–

1

CD-PUIN

14

CD-DRF

13 18 56

VDD

90

15

VSS

57

89

RESET IN

12

16 17

SYSTEM STOP

28

CD O/C

86

CD U/D

85

CD DNO

84

7666656463545251

POWER

S-W-MUTE

CENTER-MUTE

SURROUND-MUTE

POWER

QV16 QV17

L-IN

QP11 QP12

R-IN

C-IN

SL-IN

SR-IN

SW-IN

QX17 QX18

QP17

–12V

F999

T500mA L 250V

29 12

1

95 96 97

+B4

OSC

X201

4.19MHz

SWITCHING

16

ICV01

12

STK407-27 POWER AMP.

18

16 12

ICX01 STK407-27 POWER AMP.

18

SWITCHING

Q913 Q914

REGULATOR

4

3

,

10

8

~

8885

~

91 94

~

LEDD01~ LEDD23~28

+B3

+B4 (5V BACK UP)

RESET

QG01

P.FAIL DET

POSISTOR

14

7

+B

–B

5

3

+B

–B

5

3

14

+B

–B

D991

VOLTAGE

Q911 Q910

TO DOLBY SECTION

TUNER MUTE

L-IN

R-IN C-IN

SL-IN

SR-IN

SW-IN

SR-OUT

1545444241

SR-IN

+B7

SPE1~5

T1 RUN T2 RUN

T2 A FP

T2 B FP T1 CrO T2 CrO CAM-SW

TAPE SOL

TA MOT

HIGH SP

FR SP

BIAS

BEAT CUT

TA R/P

TA PB EQ.

REC MUT

T1/T2

PB MUTE

VOICE-C MIC DET

VR ST

39

17 16

11

ICZ10

M62446FP

9 8

ELECTRO-

6

VOLUME

ICZ02,04,06

1

NJM4565D

IN/OUT FILTER

AMP

ICZ01

LC7522

G.E. VOL

ICZ03,05,07

1

NJM4565M

IN/OUT FILTER

AMP

13 12

9

10

31

+B7

VOLTAGE REGURATER

TU-SD

TU-DO

AD RES

CE1

~

19

2362615560 78 79

29 30 31 32

2

33

2

34 35 36 37 38 39

SYSTEM MICROCOMPUTER

40 41 42 43 44 45 46

77 81

FUNC A

VR ST

L-OUT

31 32

R-OUT C-OUT

33

SL-OUT

34 35

SR-OUT SW-OUT

36 30

5

42

8

4

16

1

17 14

8

4

VR CLK

VR DATA

–B10

+B10 +B11

+B10

–B10

+B10 –B10

+B10

–B10

585969707167

53

DI

TU CL

CLK2

DI CLK

68 4748

FUNC B

VR CLK

VR DATA

40

41

6ch

NIC

BYP

AC3_SI

DIGITAL2

AC3_RES

DIGITAL1

SP CONF

AC3_SS

87 88 919293

ICF01

IX0254AW

AMP

QS2AC

VOLT SW

QS2SPRED

–B6

–B10

+B2

+B6

+B7

MO AR

+B10

AC

+B8

TO CD UNIT

+B9

+B12

AC3_SCK

AC3_SO

94 95

737475

QS2MO

H/P SW

IN

L R

REGULATOR

DEM 1

V1/V2

DEM 0

COM

96

98

97

6

50

2482

492726

FAN

PROT

SP LEVEL

POSISTOR

FRONT RELAY

+B7

OUT

8

5

7

3

1

4

ICP11 NJM4565M LOW BOOST AMP.

–B6

–15V

VOLTAGE REGULATOR

QZ01

+4.6V

UN-SWITCHED

+12V(MOTOR)

VOLTAGE

REGULATOR

+12V(ANALOG)

QZ02

VOLTAGE

+7.3V(CD)

+5V(AC-3)

VOLTAGE

QP91

REGULATOR

DAT

7

S-MUTE

QP13 QP14 QP16

L R

1

R

E

7

1

R

E

2

SPE IN

18

D

26

IN

27

L

29

UT

28

R

3

CHO

E

L-OUT

R-OUT

C-OUT

SL-OUT

1617181920

ICQ01 QS7777PF Q-SOUND

40

L-IN

R-IN

C-IN

SL-IN

FL DIPLAY

39 53

31

5

~

,

2

7

4

3

5

0

5

4

5

~ ~ ~ ~

ICD01

IX0233AW

SYSTEM

MICROCUMPUTER

VDD VSS

158918

4672 90 51 13142728

+B2

+B6

MEMORY BACK UP

QG02

+B3

QG03 ZDF01

FAN

H/P SW SP DET RELAY

PROT

QV13 QV14 QY11

L-OUT

9 8

R-OUT

20

1

C-OUT

7

SL-OUT

9

SR-OUT

8

20

SW-OUT

1

D992~D995

D996~D999

VF1 (AC)

~

7

3

7

1

+5V UNSWITCH +B2

T8A L 250V

Q951

–VP

F996

2

62 57

16

17

21

26

~

QX16

POWER

T991

XD01

KEY IN

TO CD UNIT

QV22 QY21

RLYV11 RLYY11 RELAY

QY52 QX20

T.F

VF2 (AC)

VF1 (AC)

KEY MATRIX

SWD03~SWD06 SWD12~SWD17 SWD23, SWD26~SWD43 SWD50~SWD54

+B6

QV20 QV21

+ – + – +

M

M901 FAN MOTOR

JV91 HEADPHONES

TMV01 SPEAKER

TERMINAL L-CH GND R-CH GND C-CH

–

GND

+

SL-CH GND

– +

SR-CH

–

SW-CH

+

GND

–

GND

TMV01 SPEAKER TERMINAL

230~240V

F992

T2.5A L 250V

220V 127V 110V

AC POWER SUPPLY CORD AC110/127/220/230-240V 50/60Hz

F991

T2.5A L 250V

SW991

VOLTAGE

SELECTOR

F991 T5A L 250V

Figure 21 BLOCK DIAGRAM (5/5)

– 21 –

CD-K491W

3 2

C

2

SQ OUT(DSP)

A

B

C

LT0H30M1

D

TR+ FO+

FO–

TR–

ACTUATOR

LD

K E B

GND

A F C

2200P

1M

MON

1M

2200P

CNS1B

K

5

E

4

A

3

B

2

F

1

CNS1A

1 2 3 4 5

R2

1K

R13

C2

1K

TE

R14 27K

3.3K

1.5V

0.01

C85

0.001

C54

R11

6.8K R12

100

R16

R21 22K

C12

0.1

C4

0.1

C1

47/16

4.8V

Q1

4.2V

KTA1266 GR

9

R8

R9

15K

100

R10

0.033

2.2K

0.001

C8

0.068

C9

0.047

R15 12K

C10

180P

8

1K

R20

R22 22K

2.5V

C5

C6

0.033 C7

0.1/50

2.5V

2.4V

2.5V

1/50

2.4V

2.5V NC

2.5V

R19

R1

10

C3

2.5V

C11

0.1

1K

2.5V

1 2 3

4 5 6

7

8 9

10 11

12

13 14 15 16

R17 33K

VREF

VCC1

FIN2

FIN1

E F

TB TE–

TE

TESI

SCI

TH

TD– TD

JP TO

FD

R18

15K

REF

1

4.8V

C33

C34

0.33/50

0.47/50

C32

0.01

560

R46

1V

0V

4.2V

2.2V

–

BHI

LDS

LDO

+

RF

–

+

–

+

REF

–

+

REF

–

+

REF

+

–

REF

–

+

REF

+

GEN

–

TO

REF

+

REF

GEN

–

REF

+

–

+

–

FA

FD–

19

18

17

2.5V

R23

10K

R24

47K

1V

PHI

FE1

REF

VCR

–

VCR

+

VCR

+

–

+

TGL1

–

THDL

JP

FSC

FOSTA

REF

GEN

+

–

REF

+

–

AGND

FE

FE–

FA–

2.4V

C13

C14

0.01

20

330P

R25

1.5K

21

R26

82K

SP

22

0V

2.5V

C30

C31

0.1/50

220/6.3

4.8V

2.5V

VR

LF2

REF1

+

–

REF

+

DEF

– –

+

HFL

+

DRF

–

IC1

LA9241M

SERVO AMP.

VCC

+

–

REF

+

–

REF

GL

FSTA

REF

S.Q.R

THD

+

–

REF

FE1

+

–

REF

SP–

SPI

SPG

2423

26

25

2.5V

10K

C16

R28

0.0047 R29 56K

R31

1.2K

R27 39K

C18

0.47/50

VCC2

JP

C17

R30

SPO

27

2.5V

0.001

6.8K

4.8V

FSS

EFBAL FOSTA TOSTA 2FREQ

LASER FSTA

8/12CM SLOF

+

–

+

–

10

REF

SLEO

28

2.5V

0V

DRF

R33

1.2K

C20

CE

DAT

CV– CV+ JP– JP+

JPCLO

SLOF

OR

REF

47/16

R34 22K

4V4V0V

CL

CE CL

LATOH

SLOF

SLD

C19

1/50

R32

10K

REF

+

–

29

2.5V

0V

2.4V

49505152535455565758596061626364

0V

NC

48

R45

JP–

32

SLI

0V

C21

47 46

45 44

2.5V

43

2.4V

42

1.5V

41

40 39 38 37 36 35 34 33

R36

0.0033

220K

2.5V 0V

2.4V

C27

HF

TP1

0V 0V

4.8V

0V

6

R37 82K

0V

4.8V

2.5V

0.001

R40

5.6K C24

2.2P

4.7K

0V

C35

1/50

C29

7

GND

4.7/50

C26

0.033

R41 47K

C25

27P

R43

56K

C28

0.1

R44 33K

R42

47K

R38 470

R39

1K

1SS133

C2

0.00

D1

CLK

DEF

TBC

2

FSC

DGND

REF

+

–

SLC

3

RFS–

+

–

RFSM

RF

CV+

4

CV–

SLOF

HFL

5

TES

TOFF

TGL

+

–

JP+

SL–

SL+

30

31

2.2V

R35

220K

C15

0.01

K

1

A

2

B

3

E

4

F

5

CNP1

K

5

E

4

A

3

B

2

F

1

TR–

1

TR+

2

FO+

3

FO–

4

GND

5

PD

6

VR

7

LD

8

PICKUP UNIT

E

CNS2B

TR–

1

TR+

2

FO+

3

FO–

4

GND

5 6

PD VR

7

LD

8

F

+

M1

M

Spindle

Motor

G

Pickup

M2

Sled

Motor SW4

In

M

–

+ –

6

5 4 3 2 1

CNS3B

CNP3A

6 5 4 3 2 1

CNS2A

1 2 3

4

5 6

7 8

CNS3A

6 5 4 3 2 1

1 2 3 4 5 6 7 8

CNP2

CNP3

6 5 4 3 2 1

PD

LD

TR– TR+ FO+ FO–

CD2GND

SP+ SP– SL2+ SL2– CD2PUIN

C36

100/16

2.5V

1

2.5V

2

0V

3

2.5V

4

2.5V

5

2V

6

2V

7

0V

8

0V

9

0V

10

IC3

0V

11

0V

12

2V

13

2.5V

14

2.5V

15

0V

16

4.7V

17

0V

18

36

0V

35

0V

34

0V

33

2.5V 32

2.5V 31

1.8V 30

1.8V 29

0V

28

0V

27

0V

26

0V

25

2V

M56748FP

/SLIDE DRIVER

FOCUS/TRACKING/SPIN

2.5V

4.7V

0.7V

R48

24

2V

10K

23 22

21 20 19

+B

CD MOTOR PWB-K

12

+B

D3

RL104A

D2

RL104A

CNP12

D4

RL104A

RWC(DSP)

1

WRQ(DSP)

CO IN(DSP)

2

3

H

• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.

1

23456

Figure 22 SCHEMATIC DIAGRAM (1/20)

– 22 –

C23

WRQ(DSP)

0.0027

1

S133

A

C22 220P

R47

10K

C57

0.001

C37

0.022

R57 1K R58 1K R59 1K

R61 1K

C39

0.047

0.047 R52 27K

R53 1.2K

11

R62 1K R63 1K

R51

3.3M R50

680

C40

4.8V

2.5V

C38

0.01

0V 0V

1.9V

0V 0V

2.5V

0V

4.8V 0V 0V

0V

0V 0V

R60

1K

/CS

TEST5

TEST1

DEF1

1

TA1

2

0V

PDO

3

VVSS

4

ISET

5

VVDD

6

FR

7

VSS

8

EFMO

9

SLICE LEVEL

EFMIN

CONTROL

10

TEST2

11

CLV+

12

CLV

CLV2

DIGITAL SERVO

13

V/P

14

HLF

15

SERVO

TES

COMMAND

16

TOFF

TGL

17

18 19 20 21 22 23 24 25 26 27 28 29

4.8V 0V

4.8V

IC2

LC78622K

SERVO/SIGNAL

CONTROL

C56

0.022 CD2LD2M–

+B

IC81

TA7291S

LOADING MOTOR DRIVER

0V

6.4V1V0V

6.5V

4 3 2 1

6

5

7

NC

3.9

C82

47/16

R83

C81

47/16

R85

56

(1/2W)

C46

NC

4M

16M

/RES

/CQCK

TEST11

INTERFACE

VCO CLOCK

OSC CONTROL

SYNC-DETECT

EFM DEMODULATE

JP+

JP2

PCK

FSEQ

0V

2.5V

4.8V

NC

R81

2.9V

0V

3.9K

8

9

R82

6.8K

100P

FSX

COIN

RWC

SQOUT

WRQ

µ-COM

2Kx8

RAM

ERROR COERECT

FLAG CONTROL

EXTERNAL

OUTPUT

VDD

CONT1

CONT2

CONT3

CONT4

0V

0V0V0V

R88 1K

R90 1K

R89 1K

0V

CD2LD2M+

C45

C44

100P

NC

SFSY

SBCK

SUB-CODE

X-TAL

GENERATOR

DIGITAL FILTER

CONT5

C2F

EMPH

30 31

NC

0V

4.8V

Q51 KRC107 M 3

1

0V

+B

Q93

KRC102 M

3

2

0V

1

C47

100P

NC

49505152535455565758596061626364

PW

4FS

DIGITAL

OUT

DOUT

2.5V

0V

2

R80

6.8K

12V

R86

2.2K

C48

100P

EFLG SBSY

XVSS

XIN

XOUT

XVDD

MUTER

RVDD

RCHO RVSS

LVSS

1BIT DAC

LCHO

LVDD MUTEL

TEST4

TEST3

32

0V

NC

R54

330

Q91

KTA1271 Y

12V

10K

R87

C49

100P

2.2V

48 47

0V

46

2.1V

45

2.2V

44

4.8V

43

4.8V

42

4.5V

41

2.0V

40

0V

39

0V

38

0V

37

4.5V

36

4.8V NC

35 34

33

0V

D91

1SS133

CD2D2NO

M– M+

C53

0V

R55 150

SOL

CNP10

0.022

C83

0.022

C43

330/6.3

+B

C41 12P

C42 15P

R93 220

0.82µH

C50

1 2 3 4

5

6

7 8 9

10

+B

D81

1SS133

L61

C51

0.022

100/16

+B

BI99

1 2 3

CNS99

SOL GND(M) M– M+ GND(D) OPEN CLOSE DISC NO. GND(D) MECHA UP GND(D)

CD SERVO PWB-B

XL1

16.934MHz

D82

1SS133

CD-GND

+7.3V

Q52

KTC3203 Y

+5V

1 2

TO MAIN PWB

3

1 2 3 4

5

6

7

8

9

10

CNS10

R64

22

C52

100/16

CNPR11

P28 2-C

BIM05

+7.3V

1 2 1

CNS5

R66

330

1 2 3 4 5 6

+B

ZD61

MTZJ4.7B

+B

SOLENOID 2

SENSOR PWB-J

–

M

+

SW2 MECHA UP

2

+12V

M3 T/T UP/DOWN LOADING

SW1 OPEN/ CLOSE

SW3 DISC NUMBER

CD-K491W

1 2 3

CNP11

+B

LOCK

TO MAIN PWB

P24 1-C

CNSF11

OP/CLOS

UP/DOWN

CO IN(DSP)

SQ OUT(DSP)

234

D2GND

RES(DSP)

CQ CK(DSP)

DRF (ASP)

8

6

5

7

CNSF12

TO MAIN PWB

P24 1-D

SLD+

9

SLD–

PUIN SW

11

10

DISC NO.

12 13

14

• The numbers 1 to 12 are waveform numbers shown in page 52.

7

8 9 10 11 12

Figure 23 SCHEMATIC DIAGRAM (2/20)

– 23 –

CD-K491W

A

CNPF01

10

GND(D)

9 8

TO DISPLAY PWB P36 1-C

CNSD01

GND(D) +4.6V(D) +12V(M) COM1 RESET DATA1 STB SCK1

7 6

COM

5

RES

4

DAT

3

STB

2

SCK

1

B

TO

CD SERVO

PWB

P23 12-C

CNP11

GND(CD) +7.3V(CD) +12V(M)

CNSF11

1 2 3

BIF11

1 2 3

C

BIF12

CNSF12

RWC

11

WRQ

22

COIN

33

SQOUT

44

CQCK

55 66

RES DRF

CNP12

DISC_NO UP/DOWN

D_GND

SLD+

SLD–

PUIN

OP/CL

77 88 99

10

10 11 11 12 12

13

13 14 14

QG04

KTA1266 GR

TO

P23 7-H

CD SERVO PWB

D

GND(CD2) GND(CD1) GND(D) +7.3V(CD)

+B

+12V(M)

+B

+4.6V(D)

+B

RG11

1K

22K

@

RF76

RF77

POWER

VOICE-C

77

76

PF4

PF5

SCK

Si0

5

CQCK

SQOUT 1K

1K

RF04

RF05

10K

1K

@

RF74

RF75

QS_AC

QS_SPRED

74

75

PF3

PF2

PL6

80

P06

1

P07

2

SI1

SO1

6

7

DAT

COM

RF07 1K

RF06 1K

1K

@

RF73

RF71

RF70

RF69

RF68

VR ST

VR CLK

VR DATA

FUNC B

QS_MO

73

72

70

6869

71

PF1

PF0

PE5

PE6

PE7

SYSTEM CONTROL

MICROCOMPUTER

SCK1

P17

P16

INT0

RES(MAIN)

10 11 12 131415

8

9

STB

DRF

SCK

RES

WRQ

DS_RES

1K

RF09 1K

RF10 1K

RF11 1K

RF12

RF13 1K

RF08 1K

RG04

GND(A)

1K

100

1K

@

RF65

RF64

RF63

RF62

RF66

RF67

FUNC A

S.W.MUT

SYS_MUT

TUN_MUT CLCE1

CENT_MUT

REAR_MUT

PE0

PE1

PE2

PE3

PE4

IX0254AW

P74

PUIN

RF14 1K

10K

PD6

PD7

ICF01

VDD1

CF2

CF1

VSS1

P75

AN0

18 19 20 21 22 23 24 25 262728 29 30

16 17

VSS

0.0

RF17

SP_4K

1K

@

XF01

15P

CG05

RF19

CG06 15P

+B

1K

@

RF61

RF60

TUN_SD

DO(TU)

(DI)PD5

AN1

SP_1K

SP_250Hz 1K

1K

@

RF21

RF20

RG38 100K

RG25

1K

@

1K

@

RF59

RF58

DI(TU,VR,PR)

58596061626364656667

57

PD2

PD4

(DO)PD3

AN2

AN3

AN4

SP_16K

SP_63Hz

1K

@

RF22

RF23

@

10K

1K

@

RF55

VSS

VDD

5556

VSS2

VDD2

51

PC5

30

AN5

AN6

POSISTOR

TUN_SM

SP LEVEL

1K

10K

1K

@

RF25

RF24

RF26

PA0

PD1

AN7

1K

@

RF27

RG23

10K

10/100

SWF02

SPAN

SELECTOR

RG24

10K

@

RG06

RF82 RF83 RF84 RF85 RF86 RF87 RF88

RF91 RF92 RF93 RF94 RF95 RF96 RF97 RF98

AC32SO

QG92

KTC3199 GR

7

SO

RG94

10K

RF81

1K

@ @ @ @ @ @ @

@ @ @ @ @ @ @ @

RG95

1K 1K 1K 1K 1K 1K 1K 1K

IC

@

RG07

RG08

+B

CFWU02

+B

1SS133

9/50

MIC_DET

1K

H/P SW

AUTO_SCAN

10K

CD_DNO_SW

1K

CD_U/D_SW

1K 1K

CD_O/C_SW

1K

DGTL1

1K

DGTL2

AC3_RES

AC3_SS

AC3_SIN

AC3_SO

AC3_SCK

V1/V2 DEM0 DEM1

94

10K

RG96

470K

DH06

VSS

VDD

RES

1K

@

RF99

RF80

RWC

1K

@

RG56

1K

81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

10 0

10K

RG05

10K

@

RF79

9K/10K

SP_CONF

79

80

PL5 PL4 PL0 PL1 PL2 PL3 P30 P31 VSS3 VDD3 P32 P33 P34 P35 P00 P01 P02 P03 P04(PCCL) P05

1234

SLD–

SLD+

1K

RF02

RF01

1K

@

RF78

AD RES

78

PF7

COIN 1K

RF03

PF6

SO0

1K

@

RF54

RF53

S.W.RLY

CLK2

5354

PD0

PC7

INT1

INT2

SP PROT

SYS_STOP

1K

RF28

1K

@

RF52

RF51

CENT_RLY

REAR_RLY

51

52

PC4

50

PC6

49

PC3

48

PC2 PC1

47 46

PC0

45

PB7

44

PB6

43

PB5

42

PB4

41

PB3

40

PB2

39

PB1 PB0

38

PA7

37

PA6

36 35

PA5

34

PA4 PA3

33

PA2

32

PA1

31

INT3

RF30

1K

T1_RUN

T2_RUN

RG19 47K

RF29 1K

+4V(µ-CON) GND(µ-CON)

FRNT_RLY FAN CONT VOLT_SW AMP PB_MUT TA_T1/T2 REC_MUT TA_PB-EQ TA_R/P BEAT CUT

TA_BIAS FR SPEED(M) HIGH_SP TA MOTOR TAPE_SOL CAM_SW T2_CRO S T1_CRO S T2_B-FP S T2_A-FP S

+B

RG16

47K

RG26

10K

RF50 1K RF49 1K RF48 1K RF47 1K RF46 1K RG55 1K RF44 1K RF43 1K RF42 1K RF41 1K RF40 1K RF39 K RF38 1K RF37 1K RF36 1K RF35 1K RF34 1K RF33 1K RF32 1K RF31 1K

0.022

CG56

CG57

RG17

RG15

47/25

+4V

10K RG20 10K RG21 10K RG22 10K

10K

+B

E

F

G

H

CNP303

P33 12-A

TUN MUTE

TO TUNER PWB

P27 12-B

TO MECHA SECTION

P27 12-E

TO DECK SECTION

GND(D)

CL DO

CE(CE1)

DI

+12V(A)

GND(A)

L-CH

10

R-CH

11 11

SD

TA_FR SPEED

TA_MOT_SW

M +12V

TA_SOL

T2_A_FP

TA_CAM_SW

M_GND T1_RUN T2_RUN

T2_B_FP

T1_CrO T2_CrO

TA_T1/T2

PB_MUT

PRE L-CH

HIGH_SP

PRE R-CH

GND(A)

+12V(A)

TA_BIAS

REC L-CH

REC R-CH

TA_R/P

REC_MUT

BEAT_CUT

TA_PB-EQ

GND(D)

BIF13

CNSF13

1

22 33 44 55 66 77 88 99

10

1

2

3

4

5

6

7

8

9

10 11

2 2

12

13 14 15 16 17 18 19 20 54 55 23 24 25 26 27

+12V(A)

GND(A)

M2GND

CG08

0.001

RG01

220K

TUN L

+B

–B

+B

CH29

0.022

–B

+B

CH28

RH17

1.5K CH30

0.0056 (ML)

RH20

1.5K

CH16

RH25

1.5K

CH19

0.47/50

RH30

1.5K

RH35

1.5K CH25

0.027

0.022

1/50

CH22

(ML)

0.1

+12V(A) –15V

CH13 330P

CH17

0.047(ML)

CH20

0.015

CH23

0.0047

CH26

0.0012

+B

RH11 150K

2

–

8

1

(1/2)

4

+

3

–B

RH14 560K

RH15

33K

RH21 560K

RH22

33K

RH26 560K

RH27

33K

RH31 560K

RH32

33K

RH36

560K

RH37

33K

RH12

1K

6

47P

CH10

5

MOTOR DRIVER

DH16

1SS133

DH11

1SS133

CH15

0.22/50

DH12

1SS133

CH18

0.22/50

DH13

1SS133

CH21

0.22/50

DH14

1SS133

CH24

0.22/50

DH15

1SS133

CH27

0.22/50

RH13

150K

–

(2/2)

+

ICH11

NJM4558M

RH16 470K

DH17

1SS133

RH24

470K

DH18

1SS133

RH29 470K

DH19

1SS133

RH34 470K

DH20

1SS133

RH39

470K

7

16KHz SPE-1

63Hz SPE-2

250Hz SPE-3

1KHz SPE-4

4KHz SPE-5

+B

GND(A) REC L-CH REC R-CH PRE L-CH PRE R-CH

TUN R

TAPE L

TAPE R

AUX 2

AUX 1

GND(A)

L-CH OUT

TO PRE SECTION

R-CH OUT

VIDEO2 IN VIDEO1 IN

P28 2-G

AUX 2

81

1885801884

GND(A)

L-CH OUT

+12V

–1

R-CH OUT

• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.

1

23456

Figure 24 SCHEMATIC DIAGRAM (3/20)

– 24 –

CD-K491W

+4V

RG17

10K

RG20 10K RG21 10K RG22 10K

RG15

10K

CD GND(D2) CD GND(D1) GND(D) +7.3V(CD) +12V(M)

+B

ZDF01

MTZJ3R3A

+4.6V(D)

+B

RESET

POINT

DG02

1SS133

RG30

RG29

CG01

150

470/10

+B

–B

RESET

QG01

KRC102 M

RG37

1K

DG05

CG04

1SS133

0.01 LG01

TUN L

TAPE L

AUX 1 AUX 2

TUN R

AUX 1 AUX 2

2.2µH

78 15 80 81 82 17 84

TO VOLUME SECTION

85

P30 6-H

+B

TAPE R

+B

2 3

1

RG36

3.3K DG04

1SS133

CG03

RG35

3.3/50

1K

0.01

QG02

CG02

KTC3199 GR

+4V

VR CLK

67

VR DATA

68

VR LA TCH

69

CLK2

70

VR DI

71

FUNC A

72

FUNC B

73 54 55 58 56 57 76

P30 4-A

27

AC3-SW-CHOUT

76

AC3-RS-CHOUT

57

TO VOLUME SECTION

AC3-LS-CHOUT

56

AC3-C-CH OUT

58

AC3-R-CH OUT

55

AC3-L-CH OUT

54

SPEC ANA

77

–15V

28

+12V

19

AGND

18

LT IN

86

AGND

18

RT IN

87

RG34

10K

RG39

82

L OUT R OUT C IN(C OUT) SL IN(LS OUT) SR IN(RS OUT) SW IN(SW OUT)

GND(D)

RG33

10K

RG32

100

QG03

KTC3199 GR

CONTROL

DG03

1SS133

RG31

1K

+B

–B

+B

–B

+B

–B

+B

–B

+B

–B

+B

–15V

28

GND(A)

18

+12V(A)

19

GND(D)

27

+4.6V(D)

29

SWF-MUTE

30

31

REAR-MUTE

32

CENT-MUTE S-MUTE

33

AMP CONT

34 35

SW RLY(4)

36

REAR RLY(3)

37

CENT RLY(2)

38

VOLT SW

39

SP PROT

40

POSISTOR

41

H/P SW

42

SP LEVEL

43

FAN CONT

44

FRNT RLY(1)

45

POWER +12V(M)

3

GND(M)

7

+7.3V(CD)

46 47

CD GND(D1)

48

CD GND(D2)

49

VGND

50

+5V(AC32A)

51

GND(D3) GND(D4)

52 53

+5V(AC32B) OUT(L)

54 55

OUT(R)

56

RL OUT RR OUT

57 58

C OUT

59

C IN RL IN

60 61

RR IN

62

IN(L)

63

IN(R)

18

GND(A) +12V(A)

19 64

QS_SPRED

69

QS_AC

66

QS_MO

VCAN

1

OUT(L)

2

IN(L)

3

GND(A)

4

+12V(A)

5

OUT(R)

6

IN(R)

7

GND

8

MIC

9

P29 9-G

TO PRE SECTION

P31 7-H

TO QSOUND SECTION

FROM KARAOKE PWB

CNSU02

P32 3-A

X 2

1

188580

L-CH OUT

R-CH OUT

VIDEO2 IN IN

RE SECTION

P28 2-G

AUX 2

81

GND(A)

+12V(A)

–15V

R-CH OUT

FWA01

(AC3_B)

10

P35 8-H

CFWA01

TO DOLBY PWB

1

FWA02

20

P34 5-H

CFWA02

TO DOLBY PWB

1

CFWU01

SW IN(SW OUT)

10

C IN(C OUT)

9

L OUT(LIN)

8

SL IN(LS OUT)

7

R OUT(RIN)

+B

–B

+B

FM SIGNAL

PLAYBACK SIGNAL

765756585554

6

SR IN(RS OUT)

5

AGND

4

V-SW(V1/V2)

3

LT IN

2

RT IN

1

A-15V

20 19

AGND

18

A+12V

17

+5V

16

VGND

+5V(AC3_A)

15

+5V(AC3_A)

14 13

GND(D3)

12

GND(D4)

11

DEM1 DEM0

10

9

SP CONF

8

DGTL1

7

SO

6

DGTL2

5

SS AD RES

4

SI

3

AC3_RES

2

SCK

1

CFWU02

RECORD SIGNAL

AC3-C-CH OUT

AC3-L-CH OUT

AC3-R-CH OUT

AC3-LS-Ch OUT

AC3-RS-CH OUT

AC3-SW-CH OUT

TO PRE SECTION

MAIN PWB-A(1/5)

P28 4-G

7

8 9 10 11 12

Figure 25 SCHEMATIC DIAGRAM (4/20)

– 25 –

CD-K491W

CK31

CK29

7

M G

R

G

A

B

C

D

E

TAPE2

RECORD/ PLAYBACK HEAD

R-CH L-CH

ERASE

HEAD

F

G

TAPE2 HEAD

PWB-M

TAPE MECHANISM ASSEMBLY

MM1 TAPE

MOTOR

M

TAPE1

PLAYBACK HEAD

L–CH

R–CH

1 2 3 4 5 6

BI102

SWM3 REC FWD

SWM6 CAM SW

SWM5 F.A.S

SOLM1 SOL

SWM4 REC RVS

TAPE SV MECHA.

FWM2

L

SPEED H +

VRM1

3.3K(B)

–

1 2

PHM1

3 3 2 2

1

CNPK1

CNSK1

7

6

6 5

5

4

3

2

1

CNPK2

CNSK02

TAPE

RM1

2.7K

CK01 680P

CK02 680P

CK05

330P

RK89

QK03

2SC1845 F

QK05

2SC1845 F

1K

RK90

QK06

2SC1845 F

QK04

2SC1845 F

REC FWD

CAM SW

RUN PULSE

REC RVS

0V

CK06

330P

0V

MOT+B

M-GND

F.A.S

+B

SOL

0V

L H

0.7V

RK05

3.3K

RK11 15K

RK12 15K

0.7V

RK06

3.3K

0.7V

RK04

2.2K

RK03

2.2K

MOT L

1 1

MOT H

MOT +B

T2 A-FP

CAM SW

M-GND

T1 RUN-SW

T2 PH-OUT

SOL

T2 B-FP T1 CrO T2 CrO

RK01 1K

RK02

1K

QK09

8.7V

RK13 10K

REC

2 2

+B

11 12

2

13

2

KTC3199 GR

RK14 10K

3 3 4 4 5 5 6 6 7 7 8 8 9 9

10 10 11 12 13

REC

KTA1266 GR

8.7V

8.0V

PLAYBACK SIGNAL RECORD SIGNAL

WTL11

QK07

0V

RK09

4.7K

RK07

RK08 47K

RK10

4.7K KTC3199 GR

CK09

0.022

0V

47K

0V

QK08

2

0V

REC

0V

1

3

3.8V

QK10 KRC104 M

CK07

CK08

3.8V

0.001

1

0V

CL11

0.01

23

0V

QK11 KRC104 M

QL12

KTA1266 GR

DRIVER

RK17 1K

RK18 1K

RK15

4.7K

RL13

6.8K

QL11

KTA1266 GR

DRIVER

0V

RL12

2.2K

0V 0V

0V

+B

CL12

47/16

+B

PB EQ(CrO

RK19 56

CK15 47/16

CK11 330P

CK13 330P

2 3 4

1

HIGH=T1

23

24

0.6V

0V

CK14 330P

CK12 330P

CK16 47/16

RK20 56

PB EQ(CrO2)

RK69 220

CK60 100/16

PB EQ(CrO

RL11 33K

RL14 33K

KTA1273 Y

0V

QL15

KTA1271 Y

DRIVER

0V

DL12

1SS133

2

)

RK21 100K

CK17

0.033

0.6V

22

CK18

0.033

RK22 100K

2

)

QL14

112K

– +

+ –

112K

QK14 KRC104 M

12V

RL20

1.2K

KRC104 M

0V

RK23

3.9K

CK19 560P

3.0V

0.3V

CK22 1/50

CK20 560P

RK24

3.9K

12V

RL15 10K

RL17 10(1/2W)

RL18 10K

QK13

1

0V

RK27

8.2K CK23

0.01 RK25

5.6K

CK21 1/50

21

RK26

5.6K

CK24

0.01

RK28

8.2K

0V

1

3

2 3

0V

RK30 10K

CK26

0.0082

2

+B

0V

0V0V

+B

5

20

QL13

KRC104 M

SWITCHING

2

0V

RL16

2.2K

RL19

2.2K

RK34 68K

RK31 33K

CK25

0.0082

RK29 10K

1.3V

CK27

0.022

RK32

33K

1

1.3V

KRC104

SWITCHIN 2

0V

4.0V

3

0V

RK33 22K

19

6

RK37

6.8K

CK28

RK36

QL17

1

RK35

0V

3.3/25

6.8K

3

0V

K 2

12V

6.8K

0V0V0V0V

7

HI

18

RK38

6.8K

4.

C 2

H

• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.

1

23456

Figure 26 SCHEMATIC DIAGRAM (5/20)

– 26 –

L17 104 M CHING

0V

12V

4.0V

3

QL18

KRC104 M 2

0V

1

CD-K491W

MAIN PWB-A(2/5)

TA-F/R SPEED

0V

3

12V

QL19

KRC104 M

DRIVER 2

0V

1

+B

0V

3

DL11

0V

1SS133

RL24

3.3K

CL13

3.3/50

1

2

4.1V

0V

3

QL16 KRC107 M

TA-MOT-SW

M-12V TA-SOL

T2-A-FP

TA-CAM-SW M-GND T1-RUN T2-RUN

T2-B-FP T1-CrO

2

TA–F/R SPEED

1

2

TA-MOT-SW

M-12V

3

TA-SOL

4

T2-A-FP

5

TA-CAM-SW

6

M-GND

7

T1-RUN

8

T2-RUN

9

T2-B-FP

10

T1-CrO

11

T2 CrO

12

2

H:CrO2 L:NORM

P24 1-G

TO MAIN SECTION

3

6.8K

37 K

7

18

V

RK38

CK29

470P

CK31

270P

CK33 22/25

0V

HIGH=HI-SP

CK34 22/25

CK32 270P

6.8K

CK30

RK47

CK10

10K

47/25

CK35

CK37

0.022

0.018 2

KRC104 M

RK39

560

SWITCHING

RK41

82

LK01

1.8mH

0.6V

8

–

56K

+

PLAYBACK AND RECORD

+

/PLAYBACK AMP.

–

56K

17

0.6V

LK02

1.8mH RK42

RK40

82

560

2

CK38

470P

0.018

CK36

0.022

SWITCHING

QK16

KRC104 M

HI.SP

1

3

QK15

CK39

0.0033

ICK01

AN7345K

CK40

0.0033

3

1

3.0V

HI.SP

0V

CK41 47/25

0.3V

9

16

CK42 47/25

PB.MUTE

MUTING QK17 2SC2878 A

RK43

0V 0V

10K CK43

0V

0.022

1

0V

2

RK45 10K

RK49 10K

CK45

22/25

RK50

10K

3.7V

0V

14

15

NOR/HIGH

RIPPLE

ALC

1110

0V

3.0V

RK46 10K

RK48 10K

CK44

0.022

SWITCHING

QK19 KRC104 M

3

0V0V

CK46 220/10

6.0V

13

VCC

GND

12

0V

RK52 1K

MUTING

QK18

2SC2878 A

HI.SP

0V

CK47

0.022

TA T1/T2 H:T1 L:T2

13 14

PB.MUTE H:ON L:OFF

15

PRE L-CH

16

HI. SP H:LOW L:HIGH PRE R-CH

CK55

0.022

QK30

KRC104 M

RK73 56K

RK72 56K

17

GND(A)

18

+B

12V(A)

19

20

BIAS H:ON L:OFF

+B

REC L-CH

54

REC R-CH

55

TA R/P H:PB L:REC

23

+B

24

REC MUTE

25

BEAT CANCEL

26

TA PB EQ L:NORM H:CrO2

GND(D)

27

P24 1-H

TO MAIN SECTION

0V

RK57

4.7K

RK58 150(1/2W)

CK62

0.047 (ML)

CK50

0.0082 (P.P)

CK51

0.027 (ML)

KTA1266 GR

RK66 27K

QK28 2SC2236 Y

SWITCHING

QK24

RK60 270

RK67 47K

0V

RK68

4.7

LK04 330µH

11.7V

LK03 1mH

RK62 47K

11.7V

0V

RK61 270

0V

CK52 47/16

RK64

4.7K

BIAS

RK63

0V

SWITCHING

QK25

KTA1266 GR

MUTING

QK22

KTC3199 GR

0V

SWITCHING

KRC104 M

23

11.6V

10K

RK65

0V

2

0V

KRC104 M

0.7V

RK54 10K

QK26

1

10K

QK27

0V

0.7V

0V

RK53 10K

0V

3

0V

QK29,QK30, QK40:SWITCHING

QK40

KRC107 M

RK55 22K

RK56 22K

0V

MUTING QK21 KTC3199 GR

0V

QK29

11.7V

RK74 68K

3

0V

1

RK81

11.7V

6.8K

2

3

0V

1

11.7V

3

0V

2

0V

1

0V

2

RK75 68K

7

8 9 10 11 12

Figure 27 SCHEMATIC DIAGRAM (6/20)

– 27 –