Sharp CP-C831, GBOXS0025AWM1 Service Manual

– 1 –

CD-C831W

No. S5934CDC831W/

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

CD-C831W

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

SERVICE MANUAL

This document has been published to be used for after sales service only. The contents are subject to change without notice.

SHARP CORPORATION

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

CD-C831W

– 2 –

SAFETY PRECAUTION FOR SERVICE MANUAL

WARNINGS

THE AEL (ACCESSIBLE EMISSION LEVEL) OF THE LASER POWER OUTPUT IS LESS THAN CLASS 1 BUT THE LASER COMPONENT IS CAPABLE OF EMITTING RADIATION EXCEEDING THE LIMIT FOR CLASS 1. THEREFORE IT IS 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.

QACCB0008AW00

VOLTAGE SELECTION

The voltage selector is located on the AC voltage selector box. If adjustment is necessary, use a screwdriver in order to turn the selector in either direction until the correct voltage figure is displayed in the window next to the adjustment screw.

Figure 2 AC POWER SUPPLY CORD AND AC PLUG ADAPTOR

QACCE0011AW00

92LCoRDZ1652A

QACCL0002AW00

92LCoRD577B

92LPLUG027

92LPLUG155A

– 3 –

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

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

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

CP-C831

GBOXS0025AWM1

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

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

SPECIFICATIONS

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

CD-C831W

– 4 –

NAMES OF PARTS

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

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

CD-C831W

17 18

14

35

6

123 45

7 8

13

15

11

12

10

9

16

19

33

25 26 27

28

29

30

31

20

21

24

22

23

32

34

37

36

– 5 –

CD-C831W

Front Speaker

1. Tweeter

2. Woofer

3. Bass Reflex Ducts

4. Speaker Wire

Surround Speaker

1. Full Range Speaker

2. Speaker Wire

CP-C831

GBOXS0025AWM1

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

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

5

1

6

2

3

4

7 8

9

1

2

3

4

1

2

1

8

3 4

10

9

5 6

7

11 12

13 14

16 17 18

20

19

21 23

2

15

22

CD-C831W

– 6 –

OPERATION MANUAL

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.

– 7 –

CD-C831W

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.

Figure 7-2

Figure 7-3

CD-C831W

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

the CD cover, and close. (Note 1)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

8

Headphones PWB

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

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

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

(J1) x12

8-2

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

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

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

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

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

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

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

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

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

STEP REMOVAL

PROCEDURE

FIGURE

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.

Figure 7-1

CD-C831W

Top Cabinet

(A1) x2 ø3x12mm

(B2) x1

Side Panel (Left)

Side Panel (Right)

(B1) x1 ø3x10mm

(B1) x4 ø3x8mm

Back Board

(D1) x6 ø3x10mm

Back Board

Main PWB

CD Tray Cover

CD Player Unit

(C1) x3

(C2) x1

(C3) x2

1

2

Pull

(C2) x1

LOCK LEVER

CD-C831W

– 8 –

Figure 8-1

Figure 8-2

Figure 8-3

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 8-4

Figure 8-5

(G1) x1 ø3x10mm

(F1) x3 ø3x10mm

(E1) x1 ø3x10mm

(F1) x1 ø3x10mm

(E1) x2 ø3x10mm

(F4) x1

(G2) x1

Front Panel

Main PWB

Tuner PWB

(F2) x2

(F5) x1

(F3)x1

(F2) x2

(E2) x1

(G3) x1

Front Panel

Display PWB

Switch PWB

Open

Cassette Holder

Tape Mechanism

(J1)x2 ø3x10mm

(J1)x7 ø3x10mm

(J1)x3 ø3x10mm

(H1)x1 ø3x10mm

(K1)x5 ø3x10mm

(H2)x1

Headphones PWB

(J3)x1

(J2)x2

(M1) x1 ø3 x10mm

(L1) x1 ø3 x10mm

Turntable

Disc Tray

(L2) x1

(M2) x1

CD Player Unit

Washer

(N1) x1 ø3 x10mm

(N2) x2

CD Player Unit

CD Servo PWB

(P1) x4

ø3 x12mm (Q1) x1 ø2.6 x10mm

CD Changer Mechanism

CD Mechanism

Shift Lever

CD Player Base

– 9 –

CD-C831W

CP-C831

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

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

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

STEP REMOVAL

PROCEDURE

FIGURE

Figure 9-1

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.

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.

Figure 9-3

REMOVING AND REINSTALLING THE MAIN PARTS

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.

Figure 9-2

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.

(A1) x2 ø2.6 x5mm

Loading Motor

Motor PWB

(B1) x2 ø2.6 x6mm

Shaft (B2) x1

Stop Washer (B3) x1

Gear (B4) x1

CD Mechanism

Pickup

Screw Driver

Woofer

(A3)x4 ø4x12mm

(A3)x2 ø3x10mm

(A2)x2

Front Panel

(A1)x1

Tweeter

CD-C831W

– 10 –

MECHANISM SECTION

ADJUSTMENT

Figure 10 ADJUSTMENT POINTS

• Driving Force Check

Torque Meter Specified Value

Play: TW-2412 Tape 1: Over 80 g

Tape 2: Over 80 g

• Torque Check

Torque Meter

Specified Value

Tape 1 Tape 2

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

Point

Specified

Value

Instrument

Connection

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

Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

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

• 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

Adjusting

Parts

Instrument

Connection

Frequency

Display

Frequency

• FM Mute Level

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

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

Terminal

VRM1

TAPE SPEED

FAS SW

SWM1

TAPE MECHANISM PWB

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

TP302

R357

T351

VR351

FM MUTE LEVEL

R336

TP301

FE301

IC303

T306

T302

SO301 ANTENNA TERMINAL

TUNER PWB

AM IF

AM BAND COVERAGE

AM TRACKING

– 11 –

CD-C831W

TEST MODE

Figure 11-2

Figure 11-3

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.

CD SECTION

Figure 11-1

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

• 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 (

) or ( ) key.

<MEMORY> LASER ON

<PLAY> key input

Press <STOP> key.

Stop

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 <Disc Number 3> key: Track 15

<MEMORY> Tracking on the spot. SERVO OFF PLAY

<MEMORY> Tracking on the spot. SERVO ON PLAY

STOP

Figure 11-4

IL is not performed.

<STOP>

1 2 3

2

0.1s

0.50 V IC1 20 FE

0.1s

0.50 V IC1 7 TE

1

FOCUS OFF-SET ADJUST

TRACKING OFF-SET ADJUST

2

1

10ms

0.50 V IC1 20 FE

10ms

0.50 V IC1 7 TE

Enlarged View

TRACKING OFF-SET ADJUST

2

1

TO

TE

200 ms 1V/diV IC 1 15

200 ms 1V/diV IC 1 7

TRACKING/ ERROR BARANCE ADJUST

CD-C831W

– 12 –

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/

230–240V SWM 3 FOOL PROOF ON—OFF SWM 4 F.A.S. ON—OFF SWM 5 CAM ON—OFF

SW1 OPEN/CLOSE ON—OFF SW2 MECHA UP ON—OFF SW3 DISC NUMBER ON—OFF SW4 PICKUP IN ON—OFF SW601 SPAN SELECTOR

100/10 –50/9 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

• 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.

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

Figure 12 TYPES OF TRANSISTOR AND LED

(1) (2) (3)

(S) (G) (D)

E C B

FRONT

VIEW

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

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

L1154GT4 SLI342YCB SLI342DCB SLI342UCB SLI342UCB SLI342YCJ

2SA1318

SVC348S

FRONT VIEW

FRONT

VIEW

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

1 2 3

– 13 –

CD-C831W

Figure 13 BLOCK DIAGRAM (1/3)

27

1

2

3

4

1

8

6

7

18244020

45

15

23

16 26

27

7 2

25 20

29

35

14

21

22

3839284142 37 36

PU-IN SW

XL1

XIN

LD0

FIN2

JP–

CV+

SLC

SL1

FIN1EF

FD

SPO

NC

SLD

SL–

SL+

DRF

CL

DAT

CE

VCC1

6

+5V

PICKUP IN

SW4

FOCUS COIL

TRACKING COIL

M1

SPINDLE

MOTOR

M

M2

SLED

MOTOR

PICKUP UNIT

9

2

4 8

IC2

LC78622NE

SERVO/SIGNAL

CONTROL

+B1

IC3

M63001FP

FOCUS/

TRACKING/

SPIN/SLED

DRIVER

IC1

LA9241M

SERVO AMP.

RES. CQCK. COIN

SQOUT. RWC. WRQ

~

CL, DAT, SELIAL CONTROL/CE

Q51

SL+. SL–. DRF

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

+B1

62

64

45

36 23

43

37

38 39 40

33 38 39 46

24 25

10

1

2

3

4

5

6

10

26

58

53

~

64

62 51

10 12

11

22

20

32 40 4344

53 52 51

54 31 30

29 23 27 16 15

41

44

Q1

Q52

+4.3V

Q81

+7.3V (B1)

REGULATOR

TO MAIN SECTION

(TO IC601)

XOUT

EFMO

EFMIN

CLV+

JP–

CONT2

CONT1

LCHO

LVSS

RVSS

RCHO

VVDD

VDD

LVDD

RVDD

XVDD

SW1

OPEN/CLOSE

SW2

MECHA UP

SW3

DISC No.

M3

LOADING

SOLM1

TO MAIN SECTION

CNS10

+B5

~~

CNP11

CD-C831W

– 14 –

Figure 14 BLOCK DIAGRAM (2/3)

X351

456kHz

FM DET

CF351

+B4

VOLTAGE REGURATER

+5V

FM +B

VT

T306

T302

CF302

DO

CE

CL

DI

FE301

FM FRONT END

Q360

MPX VCO CUT

RL

Q354

Q353

PHASE

Q361 MPX

MPX

IN

FM/AM

OUT

IF IN

IC303

LA1832

FM/AM IF MPX.

IF

OUT

SD

FM MONO/ST

MONO/ST

AM RF IN

AFC

IN

OUT

VR351

FM MUTE LEVEL

AM OSC

REG INOUT VCC

FM IF IN

12 3 4589

17 19

20

18 16

15

14

12

11

10

67

13

21

22

23

24

FM IF

FM

X352

4.5MHz

OSC

STEREO

IC302

LC72131

PLL (TUNER)

INAM

FM IN

FMOSC

T351

AM IF

GND

OSC

F OUT

AM OSC

VOLTAGE REGULATOR

AM ANT

AM RF

CF352

TUNER MUTE

MUTING

SO301 ANTENNA TERMINAL

2867 3 4

1

5

4

3 6

5

21

17

1213

10

1116

15

2220

7

1

Q371

1

6 7

4

8

3

5

FM 75 ohms

GND

AM

1

24

2

23

3 4

4

21

5

20

6

7

17

8

9

16

10

14 12

13

18

H/N

T1/T2

R-CH

L-CH

L-CH R-CH

P.B

REC

TAPE 2

TAPE 1

L NF

L(T1)

R(T1)

L(T2)

R(T2)

R NF

L R

POP REDUCE

L REC R REC

L R REC

P.B.

REC

ALC NOR/ HIGH

T1/T2

REF

L NF R NF

PB HEAD

REC PB HEAD

SWITCHING

Q103~Q106

AC BIAS

IC101

AN7345K

PLAYBACK AND RECORD

/PLAYBACK AMP.

PB

ERASE HEAD

SWITCHING

BAIS Q126

Q124 L103

Q128 L104

Q111

Q110

Q109

Q107 Q108

SWITCHING SWITCHING

SWITCHING

+B4

1 2 3

CNS11

FROM CD SECTION CNP11

SWM

3

FOOL PROO

F

SWM4 F.A.S

SOLM1

SOLENOID

SWM5

CAM

5

16

4

17

3

18

2

19

1

20

9

IC601

M62439SP

AUDIO PROCESS

O

L R

L

R

L R L R L R

TUNER

AUX TAPE

CD

+B7

–B1+B5

MUTING

Q121 Q122

Q113 Q114

F

M

S

W

BIAS OCS

15 19

11

10

JK601

VIDEO/AUX

KIA

7

R

E

4

8

–B1+B5

IC563

KIA4558P

OPE AMP.

IC562

KIA4558P

OPE AMP.

– 15 –

CD-C831W

Figure 15 BLOCK DIAGRAM (3/3)

Q704

D701 ~D704

ZD802

RL801

110V

230-240V

127V

220V

SWM3

L

PROOF

SWM4

F.A.S

SOLM1

LENOID

SWM5

CAM

1 2 3

4

15 2516

26

28

37 3839

FL701

DISPLAY

9

8

7

6

5

4 3 2 1

IC701

IX0281AW OR IX0310AW

SYSTEM CONTROL

MICROCOMPUTER

SP

ESSOR

L

R

VDD

UNSWITCH

+B7 MEMORY BACK UP

VDD

XL701

4.19MHz

+B5

+B7

KEY SW701~SW717 SW721~SW730

Q908

+B5

M

Q960

+B5

RL901

TO CD SECTION

M901 FAN MOTOR

JK970 HEADPHONES

SO901 SPEAKER TERMINAL

T.F

T801

POWER

TRANSFORMER

AC POWER SUPPLY CORD

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

T802

POWER

TRANSFORMER

Q803

Q802

+B6

+B7

UNSWITCH

3

IC704

1

7

2

BAIS

T1/T2

REC

MUTING

Q121 Q122

+B4

FM/AM SWITCHING

D801

D803~D806

Q801

D807 ~D809

2

3

1

+B7

RX701

Q705 Q706 Q707

2

1

3

6 7

L-OUT

IC901 STK407040B POWER AMP.

–B

+B

R-OUT

13

8

Q601 Q602

ZD801

Q603 Q604

+B1

–B1

+B4

+B5

+B2

+7.3V

+12V(ANALOG)

+12V(MOTOR)

+5.6V

+5V

Q821

Q822

Q824

Q823

VOLTAGE

REGULATOR

VOLTAGE

REGULATOR

VOLTAGE

REGULATOR

VOLTAGE

REGULATOR

Q702 Q703

AVDD

~~~

14 10

15

101112131415161718192021222324252627

282930

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

7170696867666564636261 80797877

767574

737260595857565554

535251

VDD

PHM1

D810~D813

FRONT

FRONT SPEAKER

SURROUND SPEAKER

F802

T4A L 250V

F803

T4A L 250V

F832

T500mA L 250V

F805

T2A L 250V

29

36

~

M

MM1

TAPE MOTOR

SW601

SPAN

SELECTOR

+B7

–15V

KIA7042AP

RESET

SW801 VOLTAGE SELECTOR

CD-C831W

– 16 –

Figure 16 SCHEMATIC DIAGRAM (1/9)

A

B

C

D

E

F

G

H

1

23456

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

R602 1.

R604 1.

R606 1.

R608 1.

R605 1.5K

R601 1.5K

C603

4.7/50

R603 1.5K

C605

4.7/50

R607 1.5K

C601

4.7/50

C627 22/25

R625 22K

R639 47K

R615

3.9K

R101 1K

C108 0.001

Q108

2SC3331

R108

47K

R110

4.7K

R109

4.7K

R112 10K

R117

1K

C113 330P

R114 10K

Q110

KRC104 M

Q111

KRC104 M

R111 10K

R102 1K

C111 330P

C153 100/16

R155 150

ZD601 MTZJ2.4B

C614 0

C612 0

R612

22K

R610 10K

C619

0.022

R623 10K

C617 10/50

IC601

M62439SP

AUDIO PROCESSOR

10 11

12

13

14

15

16

17

18

19

20

9

8

7

6

5

4

3

2

1

C613

0.22

C611 0.033

C615

0.22

R609

2.2K

R621 10K

R613 10K

C621

0.1/50

R611 330

R115

4.7K

R104

2.2K R106

3.3K

R105

3.3K R103

2.2K

R113 10K

C109

0.047

Q109 2SA1318

Q106

2SC2389 SE

Q104

2SC2389 SE

Q105

2SC2389 SE

Q103

2SC2389 SE

C102

0.001 C101

0.001

C105 180P

C106 180P

CNP102 CNP101

R172 220K

R171 220K

C114 330P

R118

1K

C112 330P

Q107

2SC3331

R107

47K

C107

0.001

R619

2.2K R620

2.2K

R616

3.9K

R622 10K

C622

0.1/50

R629 330(1/2W)

R635

330

R636 330

C629 22/25

R628

22K

R617

2.2K

R618

2.2K R614

10K

C623

0.001

C624

0.001

Q602

2SC3331

Q601 2SC3331

C634

0.0047

C635

0.0047

R646 100K

R645

100K

C626

0.001

C625

0.001

Q604 2SC3331

Q603 2SC3331

C115 47/25

C116 47/25

R135

8.2K

C127

0.022

C128

3.3/50

R137

C121 1/50

R123

3.9K

C119 560P

C117

0.033

R1

38

R132

33K

R120

56

C120 560P

R126

5.6K

R119

56

C118

0.033 R122 100K

R124

3.9K

C122 1/50

R125

5.6K

R121 100K

R131 33K

6

5

4 3 2 1

C156

3.3/50

C154

C155

3.3/50

R173

5.6K

R169

680

Q113

2SC3331

R174

5.6K

R170 680

R175 1K

Q114

2SC3331

P18 1 - E

TO POWER SECTION

BI601

P23 12 - C

TO CD SERVO PWB

CNP11

1 2

3

2

TAPE1_R

TAPE1_L

A_GND

M_GND ERASE TAPE2_R2

TAPE2_R1 TAPE2_L1

9.3V

8.6V

9.3V

0V

3.4V

0V

0.7V

0V

0.7V

0V

0.7V

0V

0.7V

0V

CNS11

+12V

+7V

CD_GND

L-CH

A_GND

R-CH

–

+

Hich=T1

+

112K

+B

CD_+B

CD_GND

L A_GND

A_12V

A_GND M_GND

3

2

1

3

2

CNS101

R-CH

L-CH

PLAYBACK HEAD

TAPE1

CNS102

RECORD/

PLAYBACK HEAD

TAPE2

R-CH

L-CH

ERASE HEAD

FM SIGNAL

RECORD SIGNAL

1

6

4 5

3

2

1

6

4 5

3

2

7

6

5

4

3

1 2

1

3

2

3

2

1

7

6

5

4

3

1 2

R134

68K

R

12

13

10

14

TAPE2_L2

PLAYBACK SIGNAL

1920

21

222324

R136

8.2K

Q109 ~ Q111: SWITCHING

Q103 ~ Q108: SWITCHING

– 17 –

CD-C831W

Figure 17 SCHEMATIC DIAGRAM (2/9)

7

8 9 10 11 12

CNP303

R640 47K

R642 47K

6

02 1.5K

C604

4.7/50

6

04 1.5K

C606

4.7/50

6

06 1.5K

608 1.5K

C602

4.7/50 C654

4.7/50

C652 1/50

C651

3.3/50

C653

4.7/50

C650

3.3/50

C620

10/50

ZD602

MTZJ2.4B

R641 47K

R653 220K

R655

5.6K

R651 680

R157 220K

L103

100µH

Q121 2SC3331

R153 10K

R630

330

(1/2W)

C628

0.22

614 0.22

612 0.033

R612

22K

C616

10P

R626 2.2K

R624 330

C618

0.022

C631 390P

C632 390P

R632

22K

R633 22K

R634 22K

R652

220K

R650

680

R654

5.6K

R656

1K

L104

330µH

R168 12

R162 47K

R164

4.7K

C150

0.0039

R167 100K

R166 47K

R160 150

R631

22K

R638 220K

R637 220K

JK601

9

8

7

6

5

4

3

2

1

CNP701

R158

220

Q124

2SA1015 GR

Q128

KTC3203 Y

C151

0.027 (ML)

C152 47/25

Q126

KRC104 M

IC101

AN7345K

PLAYBACK AND

RECORD/PLAYBACK AMP.

R141

56

R135

8.2K

C129 470P

R139 560

C141 1/50

C128

3.3/50 C131

0.001

C146

220/10

R146

10K

C135 0.068

C139 0.0033

R145 10K

R137

6.8K

C145

22/25

C140

0.0033

C130

470P

C142

1/50

R140 560

C132

0.001

R138

6.8K

C134 22/25

C136

0.068

R142

56

C133 22/25

9

8

7

6

Q122

2SC3331

C154

47/16

R156 220K

C630

0.022

D601

1SS133

D602

1SS133

CNS701

P20 1 - D

TO DISPLAY PWB

P18 1 - E

TO POWER SECTION

7 6

8 4 5

MAIN PWB-A1(1/2)

SP_DET SP_RLY

+5V

VF2

–VF

VF1

–15V

M_12V

REC_R

+5V

–15V

SPA_SIG

A_GND

M_12V

D_GND

REC/PLAY

T_BIAS

T_T1 T2

S_MUTE

HI_CUT

SP_RLY

SP_DET

SPN_P

VF2

-VP

VF1

DO

CLK

CE

DI

0V

0.7V

0V

11.6V

0V

VIDEO IN

0V

Vcc

ALC

GND

ALC

RIPPLE

Nor/CrO2

+

–

Hich=CHROME

56K 56K

0V

+B

–B

+B

DI

A_12V

D_GND

SW601

SPAN SELECTOR

FM/AM(KHz)

CLK

CE

DO

TUN_L

A_GND

TUN_R

–B

+B

–B

+B

–B

1

2

P24 6 - A

TO TUNER PWB

L

CD SIGNAL

L-CH

R-CH

R154 10K

REC_L

R134

68K

11.7V

0V

11.6V

3

17 15 16

10

9

8

7

6

5

4

3

2

1

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

10 11 12

17

18

9

16

15 14 13

R136

8.2K

MUTING

SWITCHING

BIAS

BIAS OSC

CNS303

Q650 2SC3331

Q651 2SC3331

50/9

100/10

CD-C831W

– 18 –

A

B

C

D

E

F

G

H

1

23456

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

Figure 18 SCHEMATIC DIAGRAM (3/9)

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

Sharp CP-C831, GBOXS0025AWM1 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual