Sharp CDC-831-W Service manual

CD-C831W

SERVICE MANUAL

No. S5934CDC831W/

CD-C831W

CD-C831W mini component system consisting of CD-C831W (Main unit), CP-C831 (Front speaker) and GBOXS0025AWM1 (Surround speaker).

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

CONTENTS

Page

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

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

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

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

OPERATION MANUAL ...................................................................................................................................................... 6

DISASSEMBLY.................................................................................................................................................................. 7

REMOVING AND REINSTALLING THE MAIN PARTS..................................................................................................... 9

ADJUSTMENT ................................................................................................................................................................. 10

NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 12

BLOCK DIAGRAM ........................................................................................................................................................... 13

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD..............................................................................................16

VOLTAGE ........................................................................................................................................................................ 32

WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 33

TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 34

FUNCTION TABLE OF IC................................................................................................................................................ 39

FL DISPLAY......................................................................................................................................................................46

PARTS GUIDE/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-C831W

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

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

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.

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.

QACCB0008AW00

QACCE0011AW00

92LCoRDZ1652A

Figure 2 AC POWER SUPPLY CORD AND AC PLUG ADAPTOR

QACCL0002AW00

92LCoRD577B

92LPLUG027

– 2 –

92LPLUG155A

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

SPECIFICATIONS

CD-C831W

General

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

50/60 Hz

Power consumption: 89 W

Dimensions: Width; 270 mm (10-5/8")

Height; 300 mm (11-13/16") Depth; 351 mm (13-13/16")

Weight: 6.4 kg (14.1 lbs.)

Amplifier section

Output power: MPO; 144 W (72 W + 72 W)

(10 % T.H.D.) RMS; 80 W (40 W + 40 W) (10 % T.H.D.) RMS; 66 W (33 W + 33 W) (0.9 % T.H.D.)

Input terminal: Video/Auxiliary (audio signal);

500 mV/47 kohms

Output terminals: Front speakers; 6 ohms

Surround Speakers; 16 ohms Headphones; 16-50 ohms (recommended; 32 ohms)

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)

Tuner section

Frequency range: FM; 88 - 108 MHz

AM; 531 - 1,602 kHz

CD-C831W

Cassette deck section

Type: Compact cassette tape Frequency response: 50 - 14,000 Hz (Normal tape) Motor: DC motor with electronic

governor x 1

Signal/noise ratio: 55 dB (TAPE 1, playback)

50 dB (TAPE 2, recording/

playback)

Bias and erasure system: AC Tape speed: 4.76 cm/sec. (1-7/8 ips.) Wow and flutter: 0.15 % (WRMS) Heads: TAPE-1: Playback x 1

TAPE-2: Record/Playback x 1

Erase x 1

CP-C831

Front speaker section

Type: 2-way [13 cm (5-1/4") woofer

and 5 cm (2") tweeter]

Maximum input power: 60 W Rated input power: 30 W Impedance: 6 ohms Dimensions: Width; 220 mm (8-11/16")

Height; 300 mm (11-13/16") Depth; 217 mm (8-9/16")

Weight: 2.6 kg (5.7 lbs.)/each

GBOXS0025AWM1

Surround speaker section

Type: 10 cm (4") full range speaker Maximum input power: 20 W Rated input power: 10 W Impedance: 16 ohms Dimensions: Width; 170 mm (6-3/4")

Height; 170 mm (6-3/4") Depth; 88 mm (3-1/2")

Weight: 0.4 kg (0.9 lbs.)/each

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

– 3 –

CD-C831W

NAMES OF PARTS

CD-C831W

Front Panel

1. Disc Number Selector Buttons

2. Disc Tray

3. Multi Indicator

4. Disc Skip Button

5. Open/Close Button

6. Extra Bass Indicator

7. FM Stereo Mode Indicator

8. FM Stereo Indicator

9. (CD) Repeat Indicator

10. (CD) Play Indicator

11. (CD) Pause Indicator

12. (CD) Disc Number Indicators

13. (CD/TUNER) Memory Indicator

14. Timer Play Indicator

15. Timer Record Indicator

16. Sleep Indicator

16. Dynamic PTY Indicator

17. Spectrum Analyzer/ Volume Level Indicator

18. (TAPE 2) Racord Indicator

123 45

6 7

8

9 10

11

12

13

14 15

17 18

16

19. Timer Set Indicator

20. (CD) Track Down/Review Button (TUNER) Preset Down Button (TAPE 2) Rewind Button

21. (CD) Track Up/Cue Button (TUNER) Preset Up Button (TAPE 2) Fast Forward Button

22. Timer/Sleep Button

23. Clock Button

24. On/Stand-by Button

25. Equalizer Mode Selector Button

26. Dimmer Button

27. Extra Bass/Demo Mode Button

28. Headphone Socket

29. Function Selector Buttons

30. (TAPE 2) Record Pause Button

31. Memory/Set Button

32. (CD/TAPE) Stop Button

33. (TAPE) Play Button (CD) Play/Repeat Button

34. Tuning and Time Up/Down Buttons

35. Volume Up/Down Buttons

36. (TAPE 1) Cassette Compartment

37. (TAPE 2) Cassette Compartment

22

23

24

28

29

19

30

36

20

31

32

33

21

34

37

25 26 27

35

– 4 –

CD-C831W

Rear Panel

1. AC Voltage Selector

2. AC Power Input Socket

3. AM Aerial Terminal

4. Aerial Earth Terminal

5. FM 75 Ohms Aerial Socket

6. Video/Auxiliary (Audio Signal) Input Sockets

7. Span Selector Switch

8. Surround Speaker Terminals

9. Front Speaker Terminals

CP-C831

Front Speaker

1. Tweeter

2. Woofer

3. Bass Reflex Ducts

4. Speaker Wire

GBOXS0025AWM1

Surround Speaker

1. Full Range Speaker

2. Speaker Wire

3

4 5

6 7

1 2

8 9

1

2

4

3

Remote Control

1. Remote Control Transmitter LED CD Control section

2. Disc Number Select Buttons

3. Memory Button

4. Pause Button

5. Clear Button

6. Track Down/Review Button

7. Track Up/Cue Button

8. Disc Skip Button

9. Play/Repeat Button

10. Stop Button

11. Random Button Tuner control section

12. Preset Up/Down Buttons Tape control section

13. (TAPE 1) Play Button

14. (TAPE 2) Record Pause Button

15. (TAPE 1/2) Stop Button

16. (TAPE 2) Play Button

17. (TAPE 2) Rewind Button

18. (TAPE 2) Fast Forward Button Common section

19. Equalizer Mode Selector Button

20. Function Selector Buttons

21. On/Stand-by Button

22. Extra Bass Button

23. Volume Up/Down Buttons

1

2

1

2 3

4 5

6 7

16 17 18

13 14

15

19 20

21 23 22

8 9

10 11 12

– 5 –

CD-C831W

TUNING/

TIME

( )

MEMORY/

SET

CLOCK

ON/

STAND-BY

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/SET button.

4

Press the TUNING/TIME ( or ) button to select the time

display mode.

"0:00" → The 24- hour displa y 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-hou r 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.

5

Press the MEMORY/SET button.

6

Press the TUNING/TIME ( or ) button to adjust the hour.

Press the TUNING/TIME ( or ) button once to advance

the time by 1 hour. Hold it down to advance continuously.

When the 12-hour display is selected, "AM" will change auto-

matically to "PM".

7

Press the MEMORY/SET button.

8

Press the TUNING/TIME ( or ) button to adjust the

minutes.

Press the TUNING/TIME ( or ) button once to advance

the time by 1 minute. Hold it down to change the time in 5

minute intervals.

The hour setting will not advance even if minutes advance from

"59" to "00".

9

Press the MEMORY/SET button.

The clock starts operating from "0" seconds. (Seconds are not

displayed.)

To see the time display:

Press the CLOCK button.

The time display will appear for about 5 seconds.

AM 12:00AM 0:000:00

2

3

4

7

6

5

8

9

Note:

The clock display will flash on and off at the push of the

CLOCK button when the AC power supply is restored after a

power failure occurs or after the AC power lead is discon-

nected.

If this happens, follow the procedure below to change the clock

time.

To change the clock time:

Press the CLOCK button.

Within 5 seconds, press the MEMORY/SET button.

Perform steps 6 - 9 above.

To change the time display mode:

Perform steps 1 - 2 in the section "RESETTING THE MICRO-

COMPUTER".

Perform steps 1 - 9 above.

(Main unit operation)

In this example, the clock is set for the

24-hour (0:00) system.

SETTING THE CLOCK

1

2

1

2

3

PREPARATION FOR USE

15

Remote control

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.

0.2 m - 6 m

(8" - 20')

AM/FM 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 AM

station. The illustration shows the 9 kHz interval zones (regions

1 and 3), and the 10 kHz interval zone (region 2).

Before using the unit, set the SPAN SELECTOR switch (on the

rear panel) to AM 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 AM

interval (50 kHz FM interval), and "100/10" for 10 kHz AM

interval (100 kHz FM interval).

3

Whilst pressing down the button and the

button, hold down the ON/STAND-BY button for at least 1

second.

Caution:

The operation explained above will erase all data stored in

memory including clock and timer settings, and tuner and CD

presets.

SPAN SELECTOR

FM/AM(kHz)

50/9

100/10

2

1,2

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

Whilst pressing down the button and the

button, hold down the ON/STAND-BY button for at least 1

second.

Caution:

The operation explained above will erase all data stored in

memory including clock and timer settings, and tuner and CD

presets.

OPERATION MANUAL

– 6 –

DISASSEMBLY

Caution on Disassembly

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

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

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

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

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

CD-C831W

STEP REMOVAL

1 Top Cabinet 1. Screw ..................... (A1) x4 7-1

2 Side Panel 1. Screw ..................... (B1) x6 7-1

(Left/right) 2. Hook....................... (B2) x2

3 CD Player Unit/ 1. Turn on the power supply, 7-2

CD Tray Cover open the disc tray, take out

4 Back Board 1. Screw ..................... (D1) x6 7-2

5 Tuner PWB 1. Screw ..................... (E1) x3 8-1

6 Main PWB 1. Screw ..................... (F1) x4 8-1

7 Front Panel 1. Screw ..................... (G1) x1 8-1

8

Headphones PWB

9 Display PWB/ 1. Screw .....................

Switch PWB 2. Hook ....................... (J2) x2

10 Tape Mechanism 1. Open the cassette holder. 8-2

11 Turntable 1. Screw ..................... (L1) x1 8-3

12 Disc Tray 1. Screw ..................... (M1) x2 8-3

13 CD Servo PWB 1. Screw ..................... (N1) x1 8-4

(Note 2) 2. Socket .................... (N2) x4

14 CD Changer 1. Screw ..................... (P1) x4 8-5

Mechanism

15 CD Mechanism 1. Screw ..................... (Q1) x1 8-5

the CD cover, and close. (Note 1)

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

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

4. Socket .................... (C3) x2

2. Socket .................... (E2) x1

2. Socket .................... (F2) x4

3. Flat Wire................. (F3) x1

4. Tip Wire.................. (F4) x1

5. Flat Cable............... (F5) x1

2. Socket .................... (G2) x1

3. Hook....................... (G3) x2

1. Screw ..................... (H1) x1 8-2

2. Support Bracket ..... (H2) x1

3.Socket ..................... (J3) x1

2. Screw...................... (K1) x5

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

2. Guide ..................... (M2) x2

Note 1:

How to open the changer manually. (Fig. 7-3)

1. 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.

Note 2:

1. After removing the connector for the optical pickup from the

connector, wrap the conductive aluminium foil around the front end of connector to protect the optical pickup from electrostatic damage.

PROCEDURE

(J1) x12

FIGURE

8-2

CD-C831W

(B2) x1

(B1) x1 ø3x10mm

Side Panel (Right)

CD Player Unit

Back Board

(A1) x2 ø3x12mm

Back Board

(C3) x2

(B1) x4 ø3x8mm

(C2) x1

Pull

LOCK LEVER

Figure 7-1

(D1) x6 ø3x10mm

Figure 7-2

Figure 7-3

Top Cabinet

(B2) x1

CD Tray Cover

1

CD-C831W

Side Panel (Left)

(B1) x1 ø3x10mm

Main PWB

(A1) x2 ø3x12mm

(C1) x3

(C2) x1

1

2

– 7 –

CD-C831W

(P1) x4

ø3 x12mm (Q1) x1 ø2.6 x10mm

CD Changer Mechanism

CD Mechanism

Shift Lever

CD Player Base

(F2) x2

(E1) x2 ø3x10mm

(F1) x1 ø3x10mm

(N1) x1 ø3 x10mm

(F5) x1

(F2) x2

(G2) x1

(F4) x1

(F3)x1

(G3) x1

Tuner PWB

Switch PWB

Main PWB

Figure 8-1

(J2)x2

(G1) x1 ø3x10mm

(J3)x1

Front Panel

(E2) x1

(G3) x1

(F1) x3 ø3x10mm

(E1) x1 ø3x10mm

CD Servo PWB

(N2) x2

CD Player Unit

Figure 8-4

(J1)x2 ø3x10mm

(J1)x7 ø3x10mm

(J1)x3 ø3x10mm

(H2)x1

(H1)x1 ø3x10mm

(L2) x1

(M1) x1 ø3 x10mm

(K1)x5 ø3x10mm

Figure 8-2

(L1) x1 ø3 x10mm

Washer

Display PWB

Headphones PWB

Open

Cassette Holder

Tape Mechanism

Turntable

Disc Tray

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 8-5

(M2) x1

CD Player Unit

(M2) x1

Figure 8-3

(M1) x1 ø3 x10mm

– 8 –

CD-C831W

(A1) x2 ø2.6 x5mm

Loading Motor

Motor PWB

CP-C831

STEP REMOVAL

1 Front Speaker 1. Front Panel ............ (A1) x1 9-1

2. Tip .......................... (A2) x2

3. Screw ..................... (A3) x6

Note:

The Surround speakers can be easily disassembled. Therefore the disassembling method is not described. For details refer to the disassembling drawing in the Parts Guide.

PROCEDURE

FIGURE

REMOVING AND REINSTALLING THE MAIN PARTS

Tweeter

Front Panel

(A1)x1

(A3)x2 ø3x10mm

(A3)x4 ø4x12mm

Woofer

Figure 9-1

(A2)x2

Screw Driver

CD MECHANISM SECTION

Perform steps 1, 2, 3, 11, 12, 13, 14 and 15 of the disassembly method to remove the CD mechanism.

How to remove the loading motor (See Fig. 9-2)

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

How to remove the pickup (See Fig. 9-3)

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

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

3. Remove the pickup.

Note

After removing the connector for the optical pickup from the connector, wrap the conductive aluminium foil around the front end of connector to protect the optical pickup from electrostatic damage.

(B1) x2 ø2.6 x6mm

Figure 9-2

Stop Washer (B3) x1

Pickup

– 9 –

Shaft (B2) x1

CD Mechanism Gear (B4) x1

Figure 9-3

CD-C831W

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter Specified Value

Play: TW-2412 Tape 1: Over 80 g

• Torque Check

Torque Meter

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 Adjusting

Normal MTT-111 VRM1 3,000 ± Speaker speed 30 Hz terminal

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 AM Band — 531 kHz (fL): T306 *2

Coverage 1.1 ± 0.1 V AM 990 kHz 990 kHz (fH): T302 *1

Tracking

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

Frequency

Tape 2: Over 80 g

Specified Value

Tape 1 Tape 2

Specified

Point

Frequency

Display

Value

Setting/

Adjusting

Parts

Instrument

Connection

Instrument

Connection

• FM Notes:

1: Description of the "FM IF Adjustment" is not carried on this

Manual. It is because the IF coil in the FM front end section has been best adjusted in the factory so that its further adjustment is not needed at the field. When replacing the FM front end assembly, no adjustment is needed either.

2: The parts in the FM front end section are prepared in a

complete unit, so you can't obtain each part individually

• FM Mute Level

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

Frequency

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

Frequency

Display

Adjusting

Parts

Instrument

Connection

Terminal

CD ERROR CODE DESCRIPTION

When a malfunction occurs during CD operation, an error code will be displayed to identify the function in CD operation which failed.

Error State Code 0001 Cannot detect pickup-in SW 0101 Tray close operation error 0105 Tray close operation error 0201 Tray open operation error 0203 Tray open operation error 0304 Disc skip operation error 0305 Disc skip operation error

0307 Disc skip operation error

TAPE MECHANISM PWB

VRM1

SWM1

FAS SW

TAPE SPEED

TP302

R357

IC303

T351

AM IF

VR351

FM MUTE LEVEL

AM BAND COVERAGE

TUNER PWB

R336

FE301

T306

TP301

T302

SO301 ANTENNA TERMINAL

AM TRACKING

Figure 10 ADJUSTMENT POINTS

– 10 –

TEST MODE

1 2 3

2

1

10ms

0.50 V IC1 20 FE

10ms

0.50 V IC1 7 TE

Enlarged View

TRACKING OFF-SET ADJUST

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

• TEST mode

Function — CD test mode

Setting of TEST mode Indication of CD TST mode (Fig. 11-1) OPEN/CLOSE operation is manual operation. The pickup can be moved by using the (

<MEMORY> LASER ON

<MEMORY> Tracking on the spot. SERVO OFF PLAY

) or ( ) key.

<MEMORY> Tracking on the spot. SERVO ON PLAY

IL is not performed.

CD-C831W

<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 11-1

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. 11-2)

2. Tracking offset (Fig. 11-3)

3. E/F balance (tracking error balance) (Fig. 11-4)

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

FOCUS OFF-SET ADJUST

0.1s

0.50 V IC1 7 TE

TRACKING OFF-SET ADJUST

1 2

Figure 11-2

200 ms 1V/diV IC 1 15

200 ms 1V/diV IC 1 7

TO

TE

TRACKING/ ERROR BARANCE

1

ADJUST

2

Figure 11-4

– 11 –

Figure 11-3

CD-C831W

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 SW601 SPAN SELECTOR SW701 ON/STAND-BY ON—OFF SW703 CLOCK ON—OFF SW704 TIMER/SLEEP ON—OFF SW705 DISC 1 ON—OFF SW706 DISC 2 ON—OFF SW707 DISC 3 ON—OFF SW708 DISC SKIP ON—OFF SW709 OPEN/CLOSE ON—OFF SW710 REV ON—OFF SW711 REC PAUSE ON—OFF SW712 MEMORY/SET ON—OFF SW713 STOP ON—OFF SW714 TUNER/BAND ON—OFF

100/10 –50/9

• 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.

SW715 VIDEO ON—OFF SW716 TAPE ON—OFF SW717 CD ON—OFF SW721 DISPLAY MODE ON—OFF SW722 FF ON—OFF SW723 TUNING UP ON—OFF SW724 TUNING DOWN ON—OFF SW725 PLAY ON—OFF SW726 VOLUME DOWN ON—OFF SW727 VOLUME UP ON—OFF SW728 X-BASS/DEMO ON—OFF SW729 EQUALIZER ON—OFF SW730 DIMMER ON—OFF SW801 VOLTAGE SELECTOR 110/127/220/

SWM 3 FOOL PROOF ON—OFF SWM 4 F.A.S. ON—OFF SWM 5 CAM ON—OFF

230–240V

E C B (S) (G) (D) (1) (2) (3)

2SA1015 GR 2SA1318 2SC2389 SE 2SC3331 KRC102 M KRC104 M KRC107 M

FRONT

VIEW

KTA1266 GR KTA1271 Y KTA1273 Y KTA1274 Y KTD2058 Y KTC3199 GR KTC3203 Y

FRONT

VIEW

B C E (D)(G)(S) (3) (2) (1)

2SA1318

1 2 3

SVC348S

Figure 12 TYPES OF TRANSISTOR AND LED

– 12 –

FRONT VIEW

L1154GT4 SLI342YCB SLI342DCB SLI342UCB SLI342UCB SLI342YCJ

TO MAIN SECTION

(TO IC601)

SW2

MECHA UP

10

9

SW3

8

SW1

DISC No.

7

5

6

M3

LOADING

OPEN/CLOSE

M

2

3

1

4

CD-C831W

SOLM1

TO MAIN SECTION

CNS10

+7.3V (B1)

+5V

+B1

Q52

CNP11

2

5

4

1

33 38 39 46

43

XVDD

41

RVDD

36

LVDD

23

VDD VVDD

6

LC78622NE

SERVO/SIGNAL

44

XL1

Q1

XOUT

45

XIN

2

4 8

22

64

VCC1

SERVO AMP.

62

LD0

6

3

38 39 40

37

LVSS

RVSS

LCHO

RCHO

IC2

CONTROL

EFMO

EFMIN

10 12

11

9

~

32 40 4344

JP–

IC1

LA9241M

FIN2

2

1

Q51

27

CLV+

~

SLC

CV+

FIN1EF

3

20

4

24 25

CONT1

JP–

SL1

DAT

DRF

SPO

CONT2

26

58

~

53 64

~

RES. CQCK. COIN

SQOUT. RWC. WRQ

62 51

53

CE

52 51

CL

54 31

SL+

30

SL–

29

SLD

23

NC

27 16

FD

15

CL, DAT, SELIAL CONTROL/CE

SL+. SL–. DRF

GND (D)

10

25 20

7 2 1

9

MECHA UP

GND (D)

DISK NO.

OPEN/CLOSE

7

8

6

+B1

M63001FP

TRACKING/

SPIN/SLED

23

6

GND (D)M–M+

5

3

4

+B5

18244020

IC3

FOCUS/

DRIVER

7

45

GND (M)

2

1

3839284142 37 36

16 26

15

CNP10

PU-IN SW

35 29

22 21 14

~~

8

27

REGULATOR

Q81

+4.3V

PICKUP UNIT

FOCUS COIL

TRACKING COIL

Figure 13 BLOCK DIAGRAM (1/3)

– 13 –

M1

SPINDLE

MOTOR

M

M2

SLED

MOTOR

M

PICKUP IN

SW4

CD-C831W

3 F

O

M

W

7 E

FM 75 ohms

GND

AM

SO301

ANTENNA

TERMINAL

FE301

FM FRONT END

2867 3 4

AM RF

AM ANT

T302

F OUT

OSC

T306

VT

AM OSC

+B4

FM +B

FM IF

CF302

FM MUTE LEVEL

FMOSC

+B4

Q360

VOLTAGE REGULATOR

FM

VR351

AM IF

FM IF IN

7

T351

12 3 4589

REG INOUT VCC

FM/AM IF MPX.

AM OSC

23

22

24

IN

AFC

OUT

X352

4.5MHz

2220

15

1

OSC

IC302

LC72131

PLL (TUNER)

CF352

IC303

LA1832

21

STEREO

AM RF IN

INAM

FM IN

1116

3 6

CE

1

5

GND

13

MONO/ST

FM MONO/ST

10

4

5

DI

CL

Q371

DO

FM DET

67 SD

+B4

CF351

17 19

IF

OUT

10

PHASE

VOLTAGE REGURATER

+B4

IF IN

1213

21

X351

Q361 MPX

17

456kHz

11

+5V

12

20

18 16

FM/AM

OUT

MPX VCO CUT

MPX

IN

14

15

RL

MUTING

TUNER MUTE

Q353 Q354

3 5

3

IC563

KIA4558P

OPE AMP.

IC562

KIA4558P

OPE AMP.

8

SWM

FOOL PROO

SWM4 F.A.S

SOLM1

SOLENOID

SWM5

CAM

–B1+B5

8

4

1

6 7

1

4

–B1+B5

+B7

KIA

F S

R

FROM CD SECTION CNP11

TAPE 1

PB HEAD

TAPE 2

REC PB HEAD

L-CH

R-CH

L-CH R-CH

ERASE HEAD

REC

P.B

AC BIAS

CNS11

1 2 3

SWITCHING

Q103~Q106

PLAYBACK AND RECORD

POP REDUCE

L REC R REC

AN7345K

/PLAYBACK AMP.

L(T1)

1

24

R(T1)

L(T2)

2

23

R(T2)

L NF

3 4

R NF

T1/T2

6

REC

9

16 14

REF

12

NOR/ HIGH

15 19

SWITCHING SWITCHING

Q107 Q108

Q109

SWITCHING

BIAS OCS

Q128 L104

IC101

T1/T2

Q111

P.B.

H/N

13

4

21

5

20

7

18

8

17 10

Q110

L R

L R REC

L NF R NF

ALC

+B4

PB

JK601

VIDEO/AUX

L

R

Q113 Q114

SWITCHING

Q124 L103

AUX TAPE

TUNER

CD

11

M62439SP

1

20

IC601

5

L

16

R

4

L

17

R

3

L R

18

AUDIO PROCESS

L

2

R

19

BAIS Q126

10

9

Q121 Q122

MUTING

Figure 14 BLOCK DIAGRAM (2/3)

– 14 –

SWM3

PROOF

SWM4

F.A.S

SOLM1

LENOID

SWM5

CAM

7

KIA7042AP

SP

ESSOR

Q121 Q122

MUTING

FM/AM SWITCHING

IC704

1

2

RESET

+B4

R

13

8

L

SW601

SPAN

SELECTOR

3

REC

T1/T2

M

MM1

TAPE MOTOR

Q702 Q703

ZD801

+B7

1

RX701

3

2

+B7

KEY SW701~SW717 SW721~SW730

Q601 Q602

Q603 Q604

+B1

+B4

+B5

+B2

1 2 3

535251

50 49 48 47 46

VDD

45 44 43 42 41 40 39 38 37 36

35 34

AVDD

33 32 31

282930

PHM1

–B1

+7.3V

+12V(ANALOG)

+12V(MOTOR)

+5.6V

Q821

FL701

DISPLAY

~~~

15 2516

4

IX0281AW OR IX0310AW

SYSTEM CONTROL

MICROCOMPUTER

+B5

IC901

14

STK407040B

10

POWER AMP.

–15V

VOLTAGE

REGULATOR

Q822

T500mA L 250V VOLTAGE

REGULATOR

Q824

VOLTAGE

REGULATOR

Q823

VOLTAGE

REGULATOR

26

–B 1

Q801

28

IC701

VDD

+B7

2

F832

~

29

+B

3

36

37 3839

D701 ~D704

XL701

4.19MHz

15

D803~D806

D807 ~D809

ZD802

7170696867666564636261 80797877

737260595857565554

101112131415161718192021222324252627

8

9

7

Q704

FRONT

L-OUT

6

R-OUT

7

D801

767574

4 3 2 1

6

5

+B5

Q908

F802

T4A L 250V

F803

T4A L 250V

F805

T2A L 250V

Q705 Q706 Q707

81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100

VDD

TO CD SECTION

Q960

T801

POWER

TRANSFORMER

RL901

T.F

MEMORY BACK UP

+B5

JK970 HEADPHONES

230-240V

220V

127V

110V

UNSWITCH +B7

M901

M

FAN MOTOR

SO901 SPEAKER TERMINAL

SURROUND SPEAKER

FRONT SPEAKER

SW801 VOLTAGE SELECTOR

RL801

CD-C831W

AC POWER SUPPLY CORD

BAIS

+5V

+B6

UNSWITCH

+B7

Q803

Figure 15 BLOCK DIAGRAM (3/3)

– 15 –

Q802

D810~D813

T802

POWER

TRANSFORMER

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

CD-C831W

R137

38

C154

A

B

C

D

E

F

ERASE HEAD

G

P23 12 - C

PLAYBACK HEAD R-CH

L-CH

PLAYBACK HEAD

R-CH

L-CH

CNS11

R-CH

1

A_GND

2

L-CH

3

CD_GND

4

CNP11

+7V

5

+12V

6

TO CD SERVO PWB

TAPE1

TAPE2

RECORD/

P18 1 - E

TO POWER SECTION

CNS101

TAPE1_R

1

A_GND

2 3

TAPE1_L

CNS102

M_GND

1

ERASE

2

TAPE2_R2

3

A_GND

4

TAPE2_R1

5

TAPE2_L1

6

TAPE2_L2

7

BI601

1

2 3 4 5 6

12

13

1 2

3

10

2

14

1 2 3

CNP102 CNP101

1 2 3 4 5 6 7

+B

CD_+B

CD_GND

L A_GND R

A_12V

A_GND M_GND

+B

FM SIGNAL

R635

330

R636 330

+B

PLAYBACK SIGNAL

R621 10K

Q603 2SC3331

R615

3.9K

C625

0.001

R645

R619

2.2K R620

2.2K

C626

0.001

Q604

R616

3.9K

2SC3331

R622 10K

C627 22/25

Q109 ~ Q111: SWITCHING

C102

0.001 C101

0.001

C106 180P

C105 180P

C109

0.047 R113

10K

9.3V

0V

Q104

0V

2SC2389 SE

0V

0.7V

Q106

2SC2389 SE

Q105

2SC2389 SE

0V

2SC2389 SE

Q103 ~ Q108: SWITCHING

C635

0.0047

Q601 2SC3331

100K

2SC3331

C634

R646 100K

0.0047

R625 22K

Q109 2SA1318

0.7V R104

2.2K R106

3.3K

0.7V

R105

3.3K R103

2.2K

Q103

Q602

R114 10K

R115

4.7K

8.6V

0.7V

C623

0.001

C624

0.001

C629 22/25

R109

R107

R613 10K

R617

2.2K

R108

R110

4.7K

0V

47K

4.7K

0V

C621

0.1/50

R618

2.2K

Q110

KRC104 M

0V

2

1

0V

2

KRC104 M

R112 10K

R102 1K

R101 1K

0V

Q108

Q107

2SC3331

C603

4.7/50

R611 330

R614 10K

R628

22K

3.4V

3

3 Q111

C108 0.001

2SC3331

C107

0.001

C622

0.1/50

3.4V

C601

4.7/50

C605

4.7/50

R155 150

C153 100/16

Q113

2SC3331

C112 330P

C111 330P

R111 10K

RECORD SIGNAL

R639 47K

C617 10/50

C619

0.022

+B

R173

5.6K

R171 220K

R120

56

C118

0.033 R122

100K C116 47/25

C113 330P

C115 47/25

R121

100K

C117

0.033 R119

56

C613

0.22

1 2 3 4 5 6 7 8 9

10 11

ZD601 MTZJ2.4B

R629 330(1/2W)

+B

C155

C114 330P

222324

–

+

Hich=T1

+

–

R607 1.5K R605 1.5K R603 1.5K R601 1.5K C611 0.033

C615

0.22

2.2K

R609

R169

680

R118

1K

R117

1K

20

R608 1.

19

R606 1.

18

R604 1.

17

R602 1.

16 15

IC601

14

M62439SP

13 12

AUDIO PROCESSOR

R610 10K

R623 10K

R175 1K

R174

5.6K

R172 220K

Q114

2SC3331

R170

3.3/50

680

C156

3.3/50

C120

R132

33K

560P

R126

5.6K

R124

3.9K

C122 1/50

21

112K

4 3 2 1

5

C121 1/50

3.9K

R131 33K

R125

5.6K

C127

C119 560P

R123

C612 0 C614 0

R612

R136

R134

68K

1920

6

C128

0.022

R135

8.2K

22K

8.2K

R1

3.3/50

H

• NOTES ON SCHEMATIC DIAGRAM can be found on page 12.

1

23456

Figure 16 SCHEMATIC DIAGRAM (1/9)

– 16 –

CD-C831W

R134

L

608 1.5K

06 1.5K 04 1.5K

02 1.5K 612 0.033 614 0.22

22K

R612

C616

10P

C606

4.7/50

C604

4.7/50

C620

10/50

CD SIGNAL

C602

4.7/50

R640 47K

R626 2.2K

C628

–B

0.22

(1/2W)

R630

330

R624 330

C618

0.022 ZD602

MTZJ2.4B

–B

R642 47K

+B

R633

C631

390P C632

390P

SW601

22K

R634 22K

D601

1SS133

D602

1SS133

100/10

D_GND

CLK

DO CE

A_12V A_GND

TUN_L

TUN_R

C630

0.022

DI

R631

22K R632

C654

4.7/50

R652

220K

R654

5.6K

R650

680

Q650 2SC3331

C650

3.3/50

R641 47K

C653

4.7/50

Q651 2SC3331

R651 680

C652

R653

220K R638 220K

R655

5.6K

R637 220K

+B

C651

3.3/50

R656

1/50

1K

+B

22K

SPAN SELECTOR

FM/AM(KHz)

50/9

–B

1 2 3 4 5 6 7 8 9

CNS303

L-CH

R-CH

JK601 VIDEO IN

CNP303

P24 6 - A

TO TUNER PWB

9

6

R136

68K

R135

8.2K

C128

3.3/50

MUTING

C154

47/16

R138

6.8K

18

7

R137

6.8K

Q122

2SC3331

0V

C130

470P

R140 560

C132

0.001

C134 22/25

17

Hich=CHROME

8

C131

0.001

R139 560

C129 470P

R156 220K

R154 10K

0.7V

R142

56

C140

0.0033

C136

0.068

16

–

+

56K

+

56K

–

9

C133 22/25

R141

56

C135 0.068

C139 0.0033

REC_R

R153 10K

R146

10K

C142

1/50

C145

15 14 13

Nor/CrO2

ALC 10 11 12

C141 1/50

R145 10K

0.7V Q121 2SC3331

MUTING

22/25

RIPPLE

ALC

C146

GND

220/10

Vcc

REC_L

0V

R157 220K

0V

R158

220

11.7V

Q124

0V

2SA1015 GR

SWITCHING

L103

IC101

AN7345K

100µH

PLAYBACK AND

R167 100K

RECORD/PLAYBACK AMP.

R166 47K

C150

0.0039

+B

R164

R160 150

BIAS OSC

KTC3203 Y

C151

0.027 (ML)

11.6V

4.7K

Q128

R162 47K

11.6V

1

0V

2

Q126

KRC104 M

BIAS

0V

L104

330µH

3 0V

0V

R168 12

+B

C152 47/25

CLK

A_GND

VF1

-VP VF2

SPN_P HI_CUT S_MUTE

SP_DET SP_RLY

T_T1 T2

T_BIAS

REC/PLAY

D_GND

M_12V

+B

–B

+B

–B

SPA_SIG

–15V

+5V

M_12V

–15V

SP_DET

SP_RLY

MAIN PWB-A1(1/2)

DO

CE

DI

CNP701

VF1 –VF VF2 +5V

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20 21 22

7 6

17 15 16

8 4 5

CNS701

P20 1 - D

TO DISPLAY PWB

P18 1 - E

TO POWER SECTION

7

8 9 10 11 12

Figure 17 SCHEMATIC DIAGRAM (2/9)

– 17 –

CD-C831W

F832

T500mA

L 250V

D821

1SS133

D820

1SS133

C909

2200/50

R830

820 (3W)

C910

2200/50

C918

47/50

D904

1SS133

D903

1SS133

D906 1SS133

Q907

2SC3331

Q906

2SC3331

R928

1K

R930

10K

Q904

2SC3331

R93

56K

C938 47/50

R925

0.1(1W)

D833

1SS133

D832

1SS133

C828

0.1

(ML)

C827

0.1

(ML)

C833

0.1

(ML)

Q822

KIA7806P

31

Q821

AN78L05

1

Q824

KIA7812P 3 1

R827

22K

C826

47/25

C829

3300/25

R825

33

R832

22K

C825

22/25

C824

0.047(ML)

IC901

STK407-040B

POWER AMP.

Q823

KTD2058 Y

C904

10/50

R912 100(1/4W)

C907

10/50

R916

1K

R917 56K

C916

15P

C915 120P

C917 47/50

R918

680

R921

22K

R922

680

R923

56K

C924

15P

R924

1K

C923

47P

D803

1N4004S

D 1

D804

1N4004S

1234

5

6

7

8

9

10

11

12 13

14

15

Q905

2SC3331

R931

10K

R929

1K

C921

0.022

R939

56K

C920

0.022

R926

0.1 (1W)

R803

47K

C802

100/35

ZD801

MTZJ6.2A

C803

R802

2

C830

47/25

C821

0.047(ML)

R837

10K

C832

0.1(ML)

C831

47/25

2

C911 100/50

C912 100/50

R913

100 (1/4W)

Fusible

R966

22K

C905

220P

C902

220P

R903

100K

R901

100K

C903

1/50

C901

1/50

R904

68K

R902

68K

R905

1K

R907

1K

1

2

3

4 5

6

7

8

9

10

11

12

13

14 15 16 17

2

3

R801

12K

NC

A_GND

D_GND

M_12V

–15V

SP_RLY

A_GND

L

R

SP_DET

CD_GND M_GND

A_12V

+5V

–VF VF2 VF1

CD_+B

(2Ch)

+

–

–Vcc

+Vcc

Ch1

Ch2

Ch1

Ch2

Out

+B1

+B2

+B

–B

CNS806

P21 12 - E

TO DISPLAY PWB

MAIN PWB-A1(2/2)

FM SIGNAL

P16 2 - D, P17 12 - G

TO MAIN SECTION

D T

Fusible

R

VOLTAGE

REGULATOR

VOLTAGE

REGULATOR

VOLTAGE

REGULATOR

A

B

C

D

E

F

G

H

• NOTES ON SCHEMATIC DIAGRAM can be found on page 12.

1

23456

Figure 18 SCHEMATIC DIAGRAM (3/9)

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