Sharp CD-C422 Service Manual

Illustration: CD-C422/C422C

CD-C422/C422C/C2800/C2800C

SERVICE MANUAL

No. S3820CDC422//

CD-C422/C422C

CP-C422, REAR SPEAKER SYSTEM,
Constitute CD-C422/C422C.

CD-C2800/C2800C

CP-C2800, REAR SPEAKER SYSTEM,
Constitute CD-C2800/C2800C.

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

Illustration: CD-C2800/C2800C

CONTENTS

IMPORTANT SERVICE NOTES (For U.S.A. Only) .......................................................................................................... 2

SPECIFICATIONS .............................................................................................................................................................2

NAMES OF PARTS .......................................................................................................................................................... 3

OPERATION MANUAL..................................................................................................................................................... 5

QUICK GUIDE .................................................................................................................................................................. 6

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

REMOVING AND REINSTALLING THE MAIN PARTS.................................................................................................. 10

ADJUSTMENT................................................................................................................................................................ 11

NOTES ON SCHEMATIC DIAGRAM ............................................................................................................................. 13

WAVEFORMS OF CD CIRCUIT..................................................................................................................................... 14

BLOCK DIAGRAM .......................................................................................................................................................... 15

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD.............................................................................................18

TROUBLESHOOTING (CD CHANGER CONTROL / CD SECTION)............................................................................. 32

FUNCTION TABLE OF IC .............................................................................................................................................. 36

FL DISPLAY.................................................................................................................................................................... 42

REPLACEMENT PARTS LIST/EXPLODED VIEW

PACKING OF THE SET (For U.S.A. Only)

Page

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-C422/C422C/C2800/C2800C

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

IMPORTANT SERVICE NOTES (For U.S.A.Only)

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard)
Before returning the audio product to the user, perform the
following safety checks.

1. Inspect all lead dress to make certain that leads are not
pinched or that hardware is not lodged between the chassis
and other metal parts in the audio product.

2. Inspect all protective devices such as insulating materials,
cabinet, terminal board, adjustment and compartment
covers or shields, mechanical insulators etc.

3. To be sure that no shock hazard exists, check for leakage
current in the following manner.

* Plug the AC line cord directly into a 120 volt AC outlet.
* Using two clip leads, connect a 1.5k ohm, 10 watt resistor

paralleled by a 0.15µF capacitor in series with all exposed
metal cabinet parts and a known earth ground, such as
conduit or electrical ground connected to earth ground.

* Use a VTVM or VOM with 1000 ohm per volt, or higher,

sensitivity to measure the AC voltage drop across the
resistor (See diagram).

* Connect the resistor connection to all exposed metal parts

having a return path to the chassis (antenna, metal cabinet,
screw heads, knobs and control shafts, escutcheon, etc.)
and measure the AC voltage drop across the resistor.

VTVM

AC SCALE

1.5k ohms
10W

0.15 µ F

TO EXPOSED
METAL PARTS

TEST PROBE

CONNECT TO
KNOWN EARTH
GROUND

All check must be repeated with the AC line cord plug connection
reversed.
Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp.
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the audio
product to the owner.

SPECIFICA TIONS

CD-C422/C422C/

C2800/C2800C

General

Power source: AC 120 V, 60 Hz
Power consumption: 50 W
Dimensions: Width; 10-5/8" (270 mm)

Height; 11-13/16" (303 mm)
Depth; 13-7/16" (341 mm)

Weight: 11.2 lbs. (5.1 kg)

Amplifier section

Output power: 20 watts minimum RMS per channel into
(CD-C422/C2800) 4 ohms from 100 Hz to 20 kHz, 10 %

total harmonic distortion

Output power: MPO; 60 W (30 W + 30 W)
(CD-C422C/C2800C) (10 % T.H.D.)

RMS; 40 W (20 W + 20 W)
(10 % T.H.D.)

Output terminals: Front speakers; 5.4 ohms

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

Input terminal: Video/Auxiliaary (audio signal);

245 mV/47 kohms

Tuner section

Frequency range: FM; 87.5 - 108 MHz

AM; 530 - 1,720 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)

Front speaker section

CP-C422

Type: 2-way type [5-1/4" (130 mm) woofer and

super tweeter]

Maximum input power: 30 W
Impedance: 5.4 ohms
Dimensions: Width; 7-1/8" (180 mm)

Height; 11-13/16" (300 mm)
Depth; 8-1/16" (204 mm)

Weight: 4.6 lbs. (2.1 kg)/each

CP-C2800

Type: 3-way type [4" (100 mm) woofer, 2" (50mm)

tweeter and super tweeter]

Maximum input power: 30 W
Impedance: 5.4 ohms
Dimensions: Width; 7-1/8" (180 mm)

Height; 11-13/16" (300 mm)
Depth; 8-1/16" (204 mm)

Weight: 4.6 lbs. (2.1 kg)/each

Rear speaker section

REAR SPEAKER SYSTEM

Type: 4" (100 mm) full range speaker
Maximum input power: 10 W
Impedance: 16 ohms
Dimensions: Width; 6-11/16" (170 mm)

Height; 4-3/4" (120 mm)
Depth; 6-7/8" (175 mm)

Weight: 1.3 lbs. (0.6 kg)/each

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

Compact disc player section

Type: 3-disc multi-play compact disc player
Signal readout: Non-contact, 3-beam semiconductor

laser pickup

D/A Converter: 1-bit D/A converter
Frequency response: 20 - 20,000 Hz
Dynamic range: 90 dB (1 kHz)

– 2 –

NAMES OF PARTS

CD-C422/C422C/

C2800/C2800C

Front Panel

1. Disc Tray

2. Disc Skip Button

3. Open/Close Button:

4. Disc Number Indicator

5. Timer Indicator

6. Record Indicator

7. Sleep Indicator

8. Extra Bass Indicator: X-BASS

9. Function/CD Track/CD Counter/Frequency/Preset
Channel/Volume/Timer/Sleep Time Indicator

10. Memory Indicator

11. FM Stereo Mode Indicator: ST

12. FM Stereo Indicator:

13. CD Repeat Indicator:

14. CD Play Indicator:

15. CD Pause Indicator:

CD-C422/C422C/C2800/C2800C

12

3

45678

REC

SLEEP

1 2 3

X-BASS

101112

9

13

MEMORY ST

kHz
MHz

14 15

16. Power Button

17. Memory/Set Button

18. Record Pause Button:

19. Extra Bass/Equalizer Mode Button: X-BASS

20. Volume Up/Down Buttons:

21. Function Selector Buttons

22. Clock Button

23. Timer/Sleep Button

24. (CD)Track Down/Review Button:
(TUNER)Preset Down Button:

25. Stop Button:

26. Play/Repeat Button:

27. (CD)Track Up/Review Button:
(TUNER)Preset Up Button:

28. Random/Demo Button

29. Tuning and Time Up/Down Buttons:

30. Headphone Socket

31. (TAPE 1) Cassette Compartment

32. (TAPE 2) Cassette Compartment

21

22

16 17 18 19 20

23 24

25

26 27 28

31 32

29
30

Rear Panel

1. Speaker Terminals

2. AC Power Input Socket

3. FM/AM Loop Aerial Socket

4. Video/Auxiliary (Audio Signal) Input Sockets

– 3 –

3

1

4

2

CD-C422/C422C/C2800/C2800C

Speaker Section
Front Speaker

CP-C422

1. Super Tweeter

2. Woofer

3. Bass Reflex Duct

4. Speaker Wire

CP-C2800

5. Tweeter

6. Super Tweeter

7. Woofer

8. Bass Reflex Ducts

9. Speaker Wire

Rear Speaker

REAR SPEAKER SYSTEM

10. Full Range Speaker

11. Speaker Wire

CP-C422

1
2

3

4

CP-C2800

5
6

7

8

9

CD-C422/C422C/

C2800/C2800C

Remote Control

1. Remote Control Transmitter LED
CD Control section

2. Disc Number Select Buttons

3. Track Down/Review Button:

4. Track Up/Cue Button:

5. Disc Skip Button

6. Play/Repeat Button:

7. Stop Button:

8. Memory Button

9. Clear Button

10. Random Button

11. Pause Button:
Tuner control section

12. Preset Up/Down Buttons:
Tape control section

13. (TAPE 1/2) Stop Button:

14. (TAPE 1) Play Button:

15. (TAPE 2) Record Pause Button:

16. (TAPE 2) Play Button:

17. (TAPE 2) Rewind Button:

18. (TAPE 2) Fast Forward Button:

19. Function Selector Buttons

20. Extra Bass/Equalizer Mode Button

21. Power Button

22. Volume Up/Down Buttons:

10

13
14

15
19

21

11

1

2

5
6

3
4

98

10

7

11

12

16

17
18

20

22

– 4 –

OPERATION MANUAL

SETTING THE CLOCK

(Main unit operation)

1

Press the POWER button to turn the power off.

2

Press the CLOCK button.

3

Within 3 seconds, press the MEMORY/SET button.

4

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

display mode.

"AM 12:0 0" → The 12-hour display will appear.

(AM 12:00 - PM 11:59)

"AM 0:00 " → The 12-hou r display will appear.

(AM 0:00 - PM 11:59)

"0:00" → The 24 -hour disp lay will appe ar.

(0:00 - 23:59)

● Note that this can only be set when the unit is first installed

or it has been reset (see page 16).

5

Press the MEMORY/SET button.

6

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

● Press the TUNING/TIME 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 ( o r ) 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.)

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.

POWER

CLOCK

MEMORY/

SET

TUNING/

TIME

( )

AM 12:00 AM 0:00 0:00

2

3

4

7

6

5

8

9

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

time.

To change the clock time:

When the POWER button is set to OFF.

① Press the MEMORY/SET button.

② Perform steps 6 - 9 above.

When the POWER button is set to ON.

① Press the CLOCK button.

② Within 3 seconds, press the MEMORY/SET button.

③ Perform steps 6 - 9 above.

To see the time display:

Press the CLOCK button.

● The time display will appear for about 3 seconds.

To change the time display mode:

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

COMPUTER", on page is a circuit diagram.

② Perform steps 1 - 9 above.

In this example, the clock is set for the 12-

hour (AM 12:00) system.

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 POWER button to turn the power off.

2

While pressing down the VOLUME button and the /

button, hold down the POWER button for at least 1 sec-

ond.

1,2

2

2

Caution:

● The operation explained above will erase all data stored in

memory including clock and timer settings, and tuner and CD

presets.

CD-C422/C422C/C2800/C2800C

– 5 –

CD-C422/C422C/C2800/C2800C

MINI COMPONENT

SYSTEM

Quick-Guide

Guía rápida

Preparation for use

Preparación para su uso

Turning the power on and off

Conexión y desconexión de la alimentación

Remote co ntrol

Control remot o

LEFTLEFT

RATED SPEAKER IMPEDANCE:

5.4 OHMS MIN . 16 OHMS MIN .

RIGHTRIGHT

FRONT

SPEAKERS

REAR

SPEAKERS

FM Antenna

Antena de FM

AC 120 V, 60 Hz

120 V de CA, 60 Hz

Red

Rojo

Black

Negro

AM Loop Antenna

Antena de cuadro

de AM

Wire with the white line

Cable con la línea blanca

Red

Rojo

Black

Negro

POWER

POWER

+

+

15

15

● 2 "AA" batteries

●

Dos pilas "AA"

● Batteries are not

included.

●

Las pilas no

están incluidas.

Remote Sensor

Sensor remoto

8" - 20' (0.2m - 6m)

0,2m - 6m

Sound contr ol

Control de l sonido

● Volume

●

Volumen

● Extra-BASS/Equalizer

●

Graves extra/Ecualizador

VOLUME

/EQUALIZER

UP • • •

X-BASS

DOWN •

VOLUME

VOLUME

UP • • •

DOWN •

/EQUALIZER

X-BASS

X-BASS /

EQUALIZER

TUNER

(BAND)

ST

FM STERO

FM MONO

AM

TUNING/TIME

TAPE

(1 2)

TAPE 1

TAPE 2

C D

TAPE 2

REC PAUSE

CD playback

Reproducción de discos compactos

C D

OPEN

/CLOSE

OPEN

/CLOSE

● Label facing up

●

Etiqueta hacia arriba

Radio operation

Funcionamiento de la radio

Tape playback

Reproduc ción de cint as

Recording from CDs

Grabación de discos compactos

● Load the disc to be

recorded.

●

Introduzca el disco

que va a grabar.

● CD recording

starts.

●

La grabación de

CD empieza.

Precaution

Precaución

● The sound level at a given volume setting de-

pends on a combination of speaker efficiency,

location and many other factors. It is advisable

to avoid exposure to high volume levels, which

occur while turning the unit on with the volume

control setting up high, or while continually lis-

tening at high volume levels.

● Only discs bearing the logo as shown can be

played in this unit.

●

El nivel de sonido en una posición de volumen

fijado depende de una combinación del rendi-

miento de las altavoces, la posición y muchos

otros factores. Es aconsejable evitar un aumen-

to de volumen. Esto se produce, por ejemplo,

al conectar el aparato con el volumen puesto

en una posición alta. Evite continuar la audición

prolongada a altos niveles de sonido.

●

En este aparato sólo pueden reproducirse los

discos que tengan el logotipo mostrado.

– 6 –

DISASSEMBLY

( B1 ) x1
ø3 x12mm

( B2 ) x2
ø3 x12mm

( B2 ) x2
ø3 x12mm

( B1 ) x1
ø3 x12mm

Top Cabinet

Side Panel
(Right)

Back Board


Side Panel
(Left)

( A1 ) x2
ø3 x12mm

( A1 ) x2
ø3 x12mm

CD Tray Cover

CD Player Unit

( D1 ) x4
ø3 x8mm

Hook
( C1) x3

( C2 ) x1

( C3 ) x4

Back Board


Main PWB

Front Panel

1

1

2

A

Pull

(C2) x1

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-C422/C422C/

C2800/C2800C

STEP

REMOVAL PROCEDURE

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

2 Side Panel 1. Screw ..................... (B1) x2 7-1

(Left/right) 2. Screw ..................... (B2) x4

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) x4

4 Back Board 1. Screw ..................... (D1) x4 7-2

5 Switch PWB/ 1. Screw ..................... (E1) x6 8-1,2

Display PWB/ 2. Screw ..................... (E2) x1

Main PWB 3. Socket .................... (E3) x4

6 Front Panel 1. Screw ..................... (F1) x2 8-2

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

2. Screw...................... (G1) x6

8 Turntable 1. Screw ..................... (H1) x1 8-3

2. Cover ..................... (H2) x1

9 Disc Tray 1. Screw ..................... (J1) x2 8-3

2. Guide ..................... (J2) x2

10 CD Changer 1. Screw ..................... (K1) x4 8-4

Mechanism

11 CD Mechanism 1. Screw ..................... (L1) x1 8-4

FIGURE

CD-C422/C422C/C2800/C2800C

CD-C422/C422C/

C2800/C2800C

Figure 7-1

Figure 7-2

< A >

Note 1:

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

1. Insert the tip of fine screwdriver into the hole of CD player
base, and press down the worm wheel < A > .

2. 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.

– 7 –

LOCK 
LEVER

Figure 7-3

CD-C422/C422C/C2800/C2800C

( E1 ) x2

ø3 x10mm
( E1 ) x3
ø3 x10mm

( E1 ) x1
ø3 x 8mm

( E2 ) x1
ø3 x10mm

Switch PWB

Front Panel

Display
PWB

( H1 ) x1
ø3 x10mm

( H2 ) x1

Washer

Turntable

( G1 ) x6
ø3x10mm


Power Supply 
PWB

( E3 ) x1


Figure 8-1

Figure 8-2

Main PWB

( E3 ) x1


( F1 ) x2
ø3x10mm


( E3 ) x2


Front Panel

Open

Cassette
Holder

Tape
Mechanism

( J1 ) x1
ø2 x 4mm

( J2 ) x1

CD Player Unit

(L1 ) x1
ø2.6 x10mm

Shift Lever

CD Player Base

Disc Tray

( J1 ) x1
ø2 x 4mm

( J2 ) x1

Figure 8-3

( K1 ) x4
ø2.6 x 5mm

CD Changer
Mechanism

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 8-4

– 8 –

CD-C422/C422C/C2800/C2800C

CP-C422

STEP REMOVAL PROCEDURE FIGURE

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

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

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

CP-C422


( A1 ) x1

( A3 ) x4
ø3 x34mm

Woofer

( A2 ) x1

Screwdriver

Figure 9-1

STEP REMOVAL PROCEDURE FIGURE

1 Front Speaker 1. Net .......................... (A1) x1 9-2

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

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

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

CP-C2800CP-C2800

( A1 ) x1

( A3 ) x4
ø4x14mm

( A4 ) x4
ø4x14mm

( A2 ) x1

Tweeter

Woofer

Screwdriver

Figure 9-2

– 9 –

CD-C422/C422C/C2800/C2800C

REMOVING AND REINSTALLING THE MAIN PARTS

CD MECHANISM SECTION

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

How to remove the loading motor
(See Fig. 10-1)

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

Loading Up / Down Motor

Motor
PWB

( A1 ) x2
ø2.6 x5mm

Figure 10-1

How to remove the pickup (See Fig. 10-2)

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

Shaft
( B2 ) x1

Stop Washer
( B3 ) x1

Pickup

CD Mechanism
Gear
( B4 ) x1

Figure 10-2

– 10 –

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter Specified Value

Play: TW-2412 Tape 1: Over 80 g

Tape 2: Over 80 g

• Torque Check

Torque Meter

Play: TW-2111 30 to 60 g. cm 30 to 60 g.cm
Fast forward: TW-2231 — 60 to 120 g.cm
Rewind: TW-2231 — 60 to 120 g.cm

• Tape Speed

Test Tape

Normal MTT-111 Volume in 3,000 ± Speaker
speed motor. 30 Hz terminal

Adjusting

(MM1) (Load

TUNER SECTION

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

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Test Stage Frequency Frequency

IF 450 kHz 1,720 kHz T381 *1
Band — 530 kHz (fL): T333 *2

Coverage 1.1 ± 0.1 V
Tracking 990 kHz 990 kHz (fL): T331 *1

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

TAPE MECHANISM

Tape 1

Point

Display

MM 1
Motor

Specified Value

Specified

Value

Setting/

Adjusting

Parts

Tape 2

Instrument

Connection

resistance:
8 ohms)

Instrument

Connection

CD-C422/C422C/C2800/C2800C

• FM RF

Signal generator: 1 kHz, 75 kHz dev., FM modulated

Test Stage

Frequency

Frequency

Display

Serring/

Adjusting

Point

Band — 87.50 MHz T301(fL): *1
Coverage 1.3 V ± 50 mV

RF 98.00 MHz 98.00 MHz L312 *2

(10-30 dB)

*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker terminal

• Detection

Signal generator: 10.7 MHz, FM sweep generator

Test

Frequency

Stage

Detection 10.7 MHz 98.00 MHz T382 Input: Pin 1 of

IF 10.7 MHz 98.00 MHz T302(Turn Input: Pin 1 of

Frequency

Display

Adjusting

Parts

the core of IC301
transformer Output: TP302
T381 fully
counter­clookwise.)

• VCO Frequency

Frequency

Frequency

Display

98.00 MHz 98.00 MHz VR381* Pin 13, Pin 21
(60 dB) and ground

Adjusting

Parts

* Adjust for 76 kHz ± 200 Hz.

Notes:

After preparing the test circuit shown in Fig 11-2, connect the
Pin 13 , Pin 21 and ground of the IC303 with test circuit, and
measure the Value.
At this time, apply a standard unmodulated signal input and
adjust the VCO.

G

Pin 21 of IC303

FET : 2SK19 or 2SK54

D

S

10 kΩ

Pin 13 of IC303

Instrument
Connection

Instrument

Connection

IC303
Output: TP302

Instrument

Connection

of IC303

TO FREQUENCY
COUNTER

Volume in motor

FM BAND
COVERAGE fL

FM DET

FM IF

1

IC302

20

CF351

IC303

17 21

13

TP303

VR381

VCO

TP302

Figure 11-1 ADJUSTMENT POINTS

– 11 –

T301

AM IF

IC301

T302

L312

T382

CF301

1

T333

AM BAND
COVERAGE fL

Figure 11-2

1

L301

MAIN PWB

FM RF

TP301

1

FM

2
3

AM LOOP ANTENNA

CNP301

T331

AM TRACKING
fL

CD-C422/C422C/C2800/C2800C

1 2 3

TEST MODE

• 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. 12-1)
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.

<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

Press <STOP> key.

Stop

to specify directly any Track No.
<Disc Number 1> key: Track 4
<Disc Number 2> key: Track 9
<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 12-1

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. 12-2)

2. Tracking offset (Fig. 12-3)

3. E/F balance (tracking error balance) (Fig. 12-4)

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 12-2

200 ms
1V/diV
IC 1 15

200 ms
1V/diV
IC 1 7

TO

TE

TRACKING/
ERROR
BARANCE

1

ADJUST

2

Figure 12-4

– 12 –

10ms

0.50 V
IC1 20 FE

10ms

0.50 V
IC1 7 TE

Figure 12-3

Enlarged
View

TRACKING
OFF-SET
ADJUST

1
2

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.

CD-C422/C422C/C2800/C2800C

• 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.

REF. NO

SW1 OPEN/CLOSE ON—OFF
SW2 MECHA UP ON—OFF
SW3 DISC NUMBER ON—OFF
SW4 PICKUP IN ON—OFF
SW701 RANDOM/DEMO ON—OFF
SW702 VOLUME DOWN ON—OFF
SW703 X-BASS/EQUALIZER ON—OFF
SW704 VOLUME UP ON—OFF
SW705 REC/PAUSE ON—OFF
SW706 FF ON—OFF
SW707 STOP ON—OFF
SW708 PLAY ON—OFF
SW709 REW ON—OFF
SW710 TUNING UP ON—OFF
SW711 TUNING DOWN ON—OFF
SW712 POWER ON—OFF
SW713 CLOCK ON—OFF
SW714 TIMER/SLEEP ON—OFF
SW715 MEMORY ON—OFF

DESCRIPTION

POSITION POSITION

REF. NO

SW716 CD ON—OFF
SW717 TUNER/BAND ON—OFF
SW718 TAPE ON—OFF
SW719 VIDEO/AUX ON—OFF
SW723 DISC SKIP ON—OFF
SW724 OPEN/CLOSE ON—OFF
SWM 3 FOOL PROOF ON—OFF
SWM 4 F.A.S. ON—OFF
SWM 5 CAM ON—OFF

DESCRIPTION

E

(1)

KTA1266 GR
KTA1271 Y
KRC102 M
KTC3194 Y
KRA102 M
KRA109 M
KTC3200 GR
KTC3199 GR

FRONT

VIEW

B

C

(3)

(2)

KRC104 M
KTC3203 Y
KRC107 M

FRONT

VIEW

ECB

KTA1273 Y

Figure 13 TYPES OF TRANSISTOR

– 13 –

FRONT

VIEW

ECB

2SD2012 Y

CD-C422/C422C/C2800/C2800C

WAVEFORMS OF CD CIRCUIT

FOCUS SERCH

5ms

0.50 V

1

IC1 20 F.E

5ms

5.0 V

2

IC1 54 DRF

STOP PLAY

0.5ms

6

10.0 V
IC1 33 JP+

0.5ms

10.0 V

7

IC1 32 JP-

0.5ms

8

9

0.50 V
IC1 14 JP

0.5ms

1.00 V
IC1 7 TE

3
1

3

4

5

3

4

5

6

7
8
9

0.5ms

1.00 V
IC 41 42 HF

0.5ms

5.0 V
IC 37 HFL

0.5ms

5.0 V
IC 36 TES

0.5ms

1.00 V
IC 41 42 HF

0.5ms

5.0 V
IC 37 HFL

0.5ms

5.0 V
IC 41 42 TES

50ms

10.0 V
IC1 33 JP+

50ms

10.0 V
IC1 32 JP-

50ms

0.50 V
IC1 14 JP

50ms

1.00 V
IC1 7 TE

CUE

1
2

3

REVIEW

1
2

3

CUE

10

11

10

11

12

20ms

1.00 V
IC1 27 SPO

20ms

2.00 V
IC1 13 CLV+

50ms

1.00 V
IC1 27 SPO

50ms

2.00 V
IC1 13 CLV+

5s
100mV
IC1 29 SLD

PLAY

NORMAL DISC
TN0=01

PLAY

TCD-712 (140mm)
TN0=01

PLAY

TCD-712

6
7
8
9

6
7

8

9

0.5ms

10.0 V
IC1 33 JP+

0.5ms

10.0 V
IC1 32 JP-

0.5ms

0.50 V
IC1 14 JP

0.5ms

1.00 V
IC1 7 TE

50ms

10.0 V
IC1 33 JP+

50ms

10.0 V
IC1 32 JP-

50ms

0.50 V
IC1 14 JP

50ms

1.00 V
IC1 7 TE

REVIEW

– 14 –

12

0.5s
100mV
IC1 29 SLD

1

1

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

SP

SLD

SL–

SL+

DRF

CL

DAT

CE

VCC1

6

+5V

PICKUP IN

SW4

FOCUS COIL

TRACKING COIL

M1

SPIN

MOTOR

M

M

M2

SLIDE

MOTOR

PICKUP UNIT

9

IC2

LC78623D

SERVO/SIGNAL

CONTROL

+B1

IC5

M56748FP

DRIVER

IC1

LA9241M

SERVO AMP.

6

1

9

5

+B1

+12V(+B5)

( TO IC401 )

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)

SOL

9

8

7

6

5

4

3

2

1

CNP10

M

+5V

62

64 45 3623 43

37

38

39

40

24

25

10 10

265853

101220

324043

44

5352515431302923271615

4144

Q1

TO MAIN SECTION

IC91

TA7291

MOTOR

CONTROL

XOUT

EFMO

EFMIN

CLV+

JP–

CONT2

CONT1

RCHO

RVSS

LVSS

LCHO

VVDD

VDD

LVDD

RVDD

XVDD

SW1

OPEN/CLOSE

SW2

MECHA UP

SW3

DISC No.

M3

LOADING

SOLM1

TO DISPLAY

SECTION

CNS10

CD-C422/C422C/C2800/C2800C

Figure 15 BLOCK DIAGRAM (1/3)

– 15 –

CD-C422/C422C/C2800/C2800C

O

M

FM&AM LOOP ANT

FM BPF

L301

AM TRACKING

T331

VD331 VD332

IC301

FM FRONT END

1

TA7358AP

4

3

FM RF FM OSC

L312

57

FM

6

8

OSC

T301

Q301

OSC BUFF

+B4

FM IF

T302

9

AM BAND

T333

COVERAGE

CF301

FM +B

FM IF IN

FM/AM IF MPX.IF

IC303

LA1805

FM OSC

SWITCHING

Q351

AM IF

T382

3

1

AM MIX

24

2223

AM+B

AM OSC IN

VT

FM

+B4

21

6

5

AM IF

VCC

GND

AM RF IN

X352

4.5MHz

20

7

22

1

OSC

PLL CONTROLLER

10

ST

MPX VCO ADJ

T381

FM DET

20 13 15

FM DET

DET OUT

7

STEREO

FM IN

AMIN

15 16

11

IC302

LC72131

VR381

VCO

MPX IN

CE

4

3

DI

CL

5

MO/ST

L
R

FM/AM

111617

FM/AM

SWITCHING

Q381

VOLTAGE

REGURATER

DO

6

17

21

MON

9

10

F

+B4

ST

FM

FROM CD SECTION

TAPE 1

PB HEAD

L-CH
R-CH

TAPE 2
REC/PB

HEAD

L-CH

R-CH

ERASE
HEAD

SO401

AUX IN

VIDEO

TAPE

TUNER

CD

PLAYBACK&RECORD/

PLAYBACK AMP.

IC501

AN7345K

L (T1)

1

24

BIAS
OCS

Q515
Q516

R (T1)

L (T2)

R (T2)

L NF
R NF

POP REDUCE

L REC
R REC

REF

SWITCHING

Q571
L501

2

23

3
4

T1/T2

6

REC

9

16

14

NOR/
HIGH

12

Q581 Q582

SWITCHING

SWITCHING

Q511



~

Q514

REC

P.B

AC BIAS

P.B.

L

R

H/N

T1/T2

1915

SWITCHING

Q583

13

L

4

21

R

5

20

L

REC

7

18

R

8

L NF

17

R NF
ALC

10

SWITCHING

+B4

Q566

P.B

Q575
Q576

MUTING

BIAS
Q565

REC

T1/T2

BIAS

Figure 16 BLOCK DIAGRAM (2/3)

– 16 –

CD-C422/C422C/C2800/C2800C

9

10

M/AM
TCHING

381

TAGE
RATER

TFM

+B4

MONO/ST

FM

FL701

DISPLAY

2

1~

TAPE

MOTOR

3

M

Q703

SWM3

FOOL PROOF

SWM4
F. A. S

SOLM1

SOLENOID

SWM5

CAM

Q701

6
1

80
79
77

72
71
70

~

65
64

~

61

~

~

3330 31 32

T1/T2

TAPE REC

TAPE BIAS

9

8

7

SYSTEM CONTROL
MICROCOMPUTER

60

57

TAPE F.P.

T1 RUN PLSE

TAPE MECHA STOP

+B2

CD DSP SQOUT

CD DSP COIN

CD DSP RWC

CD DSP WRQ

CD DSP CQCK

16151413121110

IC701

IX0191AW

VDD

TAPE SOL

TAPE MOTOR

Q706

MEMORY
BACK UP

CD DSP RES

RESET

CD T/T OPEN/CLOSE

+B2

3

UNSWITCH
+B1

L-CH INPUT

T2 RRUN PLSE

CD UP DOWN/DISC NO

2423222120191817

42 41434445464748495051 4352535455565859

POWER

CD SL–

CD SL+

1

RX701

2

R-CH INPUT

25

~

27

AVDD

29

AVREF

30
33
34
35

CL

36

CE

37

DI

38

DO

39

DRF

40

CD PUIN

VDD
+B2

XL702

4.19MHz

SYSTEM STOP

RESET

RESET

Q702

KEY

SW701
SW719

~



TO CD SECTION
TO CD SECTION

TO POWER SECTION
+B5

PHM1

SW723
SW724

TO CD SECTION

TO CD SECTION

Q704
Q705

ZD701

VIDEO

TAPE

TUNER

CD

PRESET GRAPHIC EQUALIZER

+B4

CLDICE

23

24 25 57

L

16
33

R
L

17
32

R

L

19
30

R

L

21
28

R

VDD

IC401

LC75394E

AUDIO PROCESSOR

GRAPHIC EQUALIZER

VREF

LVREF

14 35 56 63 50 26 27123711381039

TO CD SECTION

RVREF

+B1

+B1

+B4

+B5

45

4

VSS

AVSS

+5V

+5V
SERVO

+12V (AUDIO)

+12V (DRIVER)

7

42

5

VOLTAGE

REGULATOR

VOLTAGE

REGULATOR

44

IC942

Q941

43

8

9

40

41

6

VOLUME

X-BASS

OUT

58
55

VOLTAGE

REGULATOR

IC941

L
R

13

14

ZD901

POWER AMP.

L-IN
R-IN

9
7

VCC

NF

8

11

4

3

Q901

VOLTAGE

REGULATOR

IC961

LA4550

MUTE

12

D901 ~ D904

D905 ~ D908

D909
D911

L-OUT
2
5

R-OUT

~



T.F

JA961
HEADPHONES

SO961

FRONT SPEAKER

TERMINAL

+
–

–
+

+
–

–
+

AC POWER

SUPPLY CORD

AC 120V 60Hz

Figure 17 BLOCK DIAGRAM (3/3)

– 17 –

PT901