Sharp CDC2900 - 3-CD Compact Stereo System User manual

– 1 –
CD-C622/C2900
No. S3908CDC622//
CONTENTS Page
IMPORTANT SERVICE NOTES (For U.S.A. Only) ........................................................................................................... 2
SPECIFICATIONS ..............................................................................................................................................................3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 6
QUICK GUIDE ................................................................................................................................................................... 7
DISASSEMBLY.................................................................................................................................................................. 9
REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 12
ADJUSTMENT ................................................................................................................................................................. 13
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 15
WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 16
BLOCK DIAGRAM ........................................................................................................................................................... 17
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD..............................................................................................20
VOLTAGE ........................................................................................................................................................................ 41
TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 42
FUNCTION TABLE OF IC................................................................................................................................................ 47
FL DISPLAY......................................................................................................................................................................54
REPLACEMENT PARTS LIST/EXPLODED VIEW
PACKING OF THE SET (For U.S.A. Only)
CD-C622
• 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-C622 mini component system consisting of CD-C622 mini
componentsystem,CP-C622 and rear (GBOXS0021AWM1)speaker
system.
Illustration: CD-C622
Illustration: CD-C2900
CD-C2900
CD-C2900 mini component system consisting of CD-C2900 mini
component system and CP-C2900 speaker system.

CD-C622/C2900
– 2 –
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
pinchedorthathardwareisnotlodgedbetweenthechassis
and other metal parts in the audio product.
2. Inspect all protective devices such as insulating materials,
cabinet,terminalboard,adjustmentandcompartmentcovers
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
havingareturnpathtothechassis(antenna,metalcabinet,
screw heads, knobs and control shafts, escutcheon, etc.)
and measure the AC voltage drop across the resistor.
AllcheckmustberepeatedwiththeAClinecordplugconnection
reversed.
Anyreading of0.3voltRMS(thiscorrespondsto0.2 milliamp.
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the audio
product to the owner.
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
TEST PROBE
0.15 µ F
1.5k ohms
10W
VTVM
AC SCALE

– 3 –
CD-C622/C2900
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)
Front speaker section
Type: 2-way type [5-1/4" (13 cm)
woofer and super tweeter]
Maximum input power: 60 W
Rated input power: 30 W
Impedance: 6 ohms
Dimensions: Width; 8-11/16" (220 mm)
Height; 11-13/16" (300 mm)
Depth; 8-9/16" (217 mm)
Weight: 5.7 lbs. (2.6 kg)/each
Type: 3-way type [5" (13 cm) woofer,
2" (5 cm) tweeter and super
tweeter]
Maximum input power: 100 W
Rated input power: 50 W
Impedance: 6 ohms
Dimensions: Width; 7-7/8" (200 mm)
Height; 11-13/16" (300 mm)
Depth; 10" (256 mm)
Weight: 6.4 lbs. (2.9 kg)/each
Rear speaker section (CD-C622 Only)
Type: 4" (10 cm) full range speaker
Maximum input power: 20 W
Rated input power: 10 W
Impedance: 16 ohms
Dimensions: Width; 6-3/4" (170 mm)
Height; 6-3/4" (170 mm)
Depth; 3-1/2" (88 mm)
Weight: 0.9 lbs. (0.4 kg)/each
CP-C622
CP-C2900
GBOXS0021AWM1
General
Power source: AC 120 V, 60 Hz
Power consumption: Stand-by; 0.3 W
(CD-C622) Power on; 95 W
Power consumption: Stand-by; 0.3 W
(CD-C2900) Power on; 100 W
Dimensions: Width; 10-5/8" (270 mm)
Height; 11-13/16" (300 mm)
Depth; 13-13/16" (351 mm)
Weight: 13.7 lbs. (6.2 kg)
Amplifier section
Output power: 40 watts minimum RMS per
(CD-C622 Except for channel into 4 ohms from 60 Hz
Canada) to 20 kHz, 10 % total harmonic
distortion
Output power: Front speakers;
(CD-C622 For Canada) MPO; 108 W (54 W + 54 W)
(10 % T.H.D.)
RMS; 60 W (30 W + 30 W)
(10 % T.H.D.)
Rear speakers;
MPO; 36 W (18 W + 18 W)
(10 % T.H.D.)
RMS; 20 W (10 W + 10 W)
(10 % T.H.D.)
Output power: 50 watts minimum RMS per
(CD-C2900 Except for channel into 6 ohms from 60 Hz
Canada) to 20 kHz, 10 % total harmonic
distortion
Output power: MPO; 180 W (90 W + 90 W)
(CD-C2900 For Canada) (10 % T.H.D.)
RMS; 100 W (50 W + 50 W)
(10 % T.H.D.)
Output terminals: Front speakers; 6 ohms
(CD-C622) Rear Speakers; 16 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
Output terminals: Speakers; 6 ohms
(CD-C2900) Headphones; 16-50 ohms
(recommended; 32 ohms)
Input terminal: Video/Auxiliary (audio signal);
500 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)
Specifications for this model are subject to change without
prior notice.
SPECIFICATIONS
CD-C622/C2900

CD-C622/C2900
– 4 –
NAMES OF PARTS
Rear Panel
1. CD Digital Output Socket
2. AC Power Input Socket
3. FM/AM Loop Aerial Socket
4. Video/Auxiliary (Audio Signal) Input Sockets
5. Front Speaker Terminals (CD-C622 Only)
6. Rear Speaker Terminals (CD-C622)
6. Speaker Terminals (CD-C2900)
Front Panel
1. Disc Number Selector Buttons
2. Disc Tray
3. Multi-function 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. Spectrum Analyzer/ Volume Level Indicator
13. (TAPE 2) Racord INdicator
14. (CD) Disc Number Indicators
15. (CD/TUNER) Memory Indicator
16. Timer Indicator
17. Sleep Indicator
18. (TAPE 2) Record Pause Button
19. (CD) Track Down/Review Button
(TUNER) Preset Down Button
(TAPE 2) Rewind Button
20. (CD) Track Up/Cue Button
(TUNER) Preset Up Button
(TAPE 2) Fast Forward Button
21. Timer/Sleep Button
22. Clock Button
23. Timer Set Indicator
24. Power Button
25. Equalizer Mode Selector Button
26. Dimmer Button
27. Extra Bass/Demo Mode Button
28. Headphones Socket
29. Function Selector Buttons
30. Memory/Set Button
31. (CD/TAPE) Stop Button
32. (TAPE) Play Button
(CD) Play/Repeat Button
33. Tuning and Time Up/Cue Buttons
34. Volume Up/Down Buttons
35. (TAPE 1) Cassette Compartment
36. (TAPE 2) Cassette Compartment
CD-C622/C2900
25
3
14
6
7
8
10
11
12 13
16
17
14 15
9
18 19 20
33
21
22 25 26
23 27
28 29 30 31 32 34
24
36
35
3
5
1
2
4
6
(Illistration: CD-C622)

– 5 –
CD-C622/C2900
CP-C622
Front Speaker
1. Super Tweeter
2. Woofer
3. Bass Reflex Ducts
4. Speaker Wire
1. Super Tweeter
2. Tweeter
3. Woofer
4. Bass Reflex Ducts
5. Speaker Wire
Rear Speaker (CD-C622 Only)
1. Full Range Speaker
2. Speaker Wire
CP-C2900
GBOXS0021AWM1
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. Power Button
22. Extra Bass Button
23. Volume Up/Down Buttons
1
2
34
12
3
5
4
1
2
CD-C622/C2900 1
8
3
410
9
5
6
7
11
12
13 14 16 17 18
20
19
21 23
2
15
22

CD-C622/C2900
– 6 –
OPERATION MANUAL
CLOCK
POWER
MEMORY/ SET
TUNING/ TIME ( )
SETTING THE CLOCK
1
Press the POWER 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.
"AM 12:00" →The 12-hour display will appear. (AM 12:00 - PM 11:59) "AM 0:00" →The 12-hour display will appear. (AM 0:00 - PM 11:59) "0:00" →The 24-hour display will appear. (0:00 - 23:59)
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.)
Note:
In the event of a power failure or when the AC power lead is disconnected, the clock display will go out. When the AC power supply is restored, the clock display will flash on and off to indicate the time when the power failure occurred or when the AC power lead was disconnected.
If this happens, follow the procedure below to change the clock time.
To change the clock time:
Press the CLOCK button. Within 5 seconds, press the MEMORY/SET button. Perform steps 6 - 9 above.
To see the time display:
Press the CLOCK button.
The time display will appear for about 5 seconds.
To change the time display mode:
Perform steps 1 - 2 in the section "RESETTING THE MICRO- COMPUTER", on page 19. Perform steps 1 - 9 above.
(Main unit operation)
In this example, the clock is set for the 12-hour (AM 12:00) system.
AM 12:00 AM 0:00 0:00
2 3
4
7
6 5
8 9
1
2
1
2
3
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 enter the stand-by mode.
2
Whilst pressing down the button and the but- ton, hold down the POWER 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.
2
1,2

– 7 –
CD-C622/C2900
MINI COMPONENT SYSTEM
Quick Guide/Guía rápida
CD-C622
Remote control x 1
Controlador remoto x 1
2 “AA” batteries Dos pilas “AA”
Remote Sensor Sensor remoto
2
Preparation for use /
Preparación para su uso
1
Check the supplied accessories /
Compruebe los accesorios suministrados
FM/AM loop antenna x 1
Antena de cuadro de
FM/AM x 1
AC power cord x 1
Cable de alimentación
de CA x 1
Batteries are not included. Las pilas no están incluidas.
8” - 20’ (0.2m - 6m) 0,2m - 6m
Speaker connection
Conexión de los altavoces
Antenna connection
Conexión de las antenas
Rear speaker (Right) Altavoz trasero (Derecho)
Rear speaker (Left) Altavoztrasero(Izquierdo)
Front speaker (Right) Altavoz delantero
(Derecho)
Front speaker (Left) Altavoz delantero
(Izquierdo)
AM Loop Antenna
Antena de cuadro
de AM
FM Antenna Antena de FM
AC 120 V, 60 Hz 120 V de CA, 60 Hz
Wire with the white line
Cable con la
línea blanca
Red Rojo
Red Rojo
Black Negro
Turning the power on and off
Conexión y desconexión de la alimentación
Remote control
Controlador remoto
POWER
POWER
15
15
Black Negro
Wire with the white line Cable con la
línea blanca
3
Listening to a CD /
Audición de discos CD
4
Listening to a tape /
Audición de una cinta
5
Listening to the radio /
Audición de la radio
6
Recording from CDs /
Grabaciones de discos CD
7
Sound control /
Control del sonldo
Label facing up Etiqueta hacia arriba
To stop the playback
Para detener la reproducción
To stop the playback
Para detener la reproducción
Load the disc to be
recorded.
Introduzca el disco
que va a grabar.
CD recording
starts.
La grabación de
CD empieza.
Volume
Volumen
Extra bass (X-BASS)
Graves extra (X-BASS)
Pre-programmed equalizer
Ecualizador preprogramado
VOLUME
FLAT HEAVY-1 HEAVY-2
SOFT-2 SOFT-1 VOCAL
To stop the playback
Para detener la reproducción
TAPE 1 TAPE 2
TAPE 2

CD-C622/C2900
– 8 –
MINI COMPONENT SYSTEM Quick Guide/Guía rápida
CD-C2900
Remote control x 1
Controlador remoto x 1
2 “AA” batteries Dos pilas “AA”
Remote Sensor
Sensor remoto
2
Preparation for use /
Preparación para su uso
1
Check the supplied accessories /
Compruebe los accesorios suministrados
FM/AM loop antenna x 1
Antena de cuadro de
FM/AM x 1
AC power cord x 1
Cable de alimentación
de CA x 1
Batteries are not included. Las pilas no están incluidas.
8” - 20’ (0.2m - 6m) 0,2m - 6m
Speaker connection
Conexión de los altavoces
Antenna connection
Conexión de las antenas
Front speaker (Right)
Altavozdelantero (Derecho)
Front speaker (Left)
Altavozdelantero
(Izquierdo)
AM Loop Antenna
Antena de cuadro
de AM
FM Antenna Antena de FM
AC 120 V, 60 Hz 120 V de CA, 60 Hz
Red Rojo
Red Rojo
Black Negro
Black Negro
Turning the power on and off
Conexión y desconexión de la alimentación
Remote control
Controlador remoto
POWER
POWER
15
15
3
Listening to a CD /
Audición de discos CD
4
Listening to a tape /
Audición de una cinta
5
Listening to the radio /
Audición de la radio
6
Recording from CDs /
Grabaciones de discos CD
7
Sound control /
Control del sonldo
Label facing up Etiqueta hacia arriba
To stop the playback
Para detener la reproducción
To stop the playback
Para detener la reproducción
Load the disc to be
recorded.
Introduzca el disco
que va a grabar.
CD recording
starts.
La grabación de
CD empieza.
Volume
Volumen
Extra bass (X-BASS)
Graves extra (X-BASS)
Pre-programmed equalizer
Ecualizador preprogramado
VOLUME
FLAT HEAVY-1 HEAVY-2
SOFT-2 SOFT-1 VOCAL
To stop the playback
Para detener la reproducción
TAPE 1 TAPE 2
TAPE 2

– 9 –
CD-C622/C2900
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.Takeoffnylonbandsorwireholderswheretheyneedbe
removed when disassembling the unit. After servicing
theunit, be sureto rearrange theleads where theywere
before disassembling.
4. Take suffcient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 9-2
Figure 9-3
CD-C622/C2900
1 Top Cabinet 1. Screw ..................... (A1) x4 9-1
2 Side Panel 1. Screw ..................... (B1) x6 9-1
(Left/right) 2. Hook....................... (B2) x2
3 CD Player Unit/ 1. Turn on the power supply, 9-2
CD Tray Cover open the disc tray, take out
the CD cover, and close.
(Note 1)
2. Hook....................... (C1) x3
3. Hook....................... (C2) x2
4. Socket .................... (C3) x3
4 Back Board 1. Screw ..................... (D1) x5 9-2
(with Digital
Output PWB)
5 Main PWB 1. Screw ..................... (E1) x3 10-1
2. Socket .................... (E2) x4
3. Flat Wire................. (E3) x1
4. Tip Wire.................. (E4) x1
5. Flat Cable .............. (E5) x1
6 Front Panel 1. Screw ..................... (F1) x1 10-1
7 Display PWB/ 1. Socket .................... (G1) x1 10-2
Switch PWB 2. Screw .....................
(G2) x12
8 Tape Mechanism 1. Open the cassette holder. 10-2
2. Screw...................... (H1) x5
9 Headphones PWB 1. Screw ..................... (J1) x1 10-2
2. Support Bracket ..... (J2) x1
10 Turntable 1. Screw ..................... (K1) x1 10-3
2. Cover ..................... (K2) x1
11 Disc Tray 1. Screw ..................... (L1) x2 10-3
2. Guide ..................... (L2) x2
12 CD Servo PWB 1. Screw ..................... (M1) x1 10-4
(Note 2) 2. Socket .................... (M2) x4
13 CD Changer 1. Screw ..................... (N1) x4 10-5
Mechanism
14 CD Mechanism 1. Screw ..................... (P1) x1 10-5
STEP REMOVAL PROCEDURE FIGURE
Note 1:
How to open the changer manually. (Fig. 9-3)
1. Change, turn fully the lock lever in the arrow direction
throughtheholeontheloadingchassisbottominthisstate.
After that, push forward the CD player base.
Note 2:
1. After removing the connector for the optical pickup fromthe
connector wrap the conductive aluminium foil around the
front end of connector so as to protect the optical pickup
from electrostatic damage.
Figure 9-1
CD-C622/C2900
LOCK
LEVER
(Illustration: CD-C622)
Top Cabinet
(A1)x2
ø3x12mm
(A1)x2
ø3x12mm
Side Panel
(Left)
Side Panel
(Right)
(B1)x1
ø3x8mm
(B1)x1
ø3x8mm
(B1)x4
ø3x8mm (B2)x1
(B2)x1
Back Board
(D1)x5
ø3x8mm
Back Board
Main PWB
CD Tray Cover
CD Player
Unit
Hook
( C1) x3
( C2 ) x1
(C3) x3
1
1
2
Pull
(C2) x1

CD-C622/C2900
– 10 –
Figure 10-1
Figure 10-2
Figure 10-3
Care when installing the CD changer mechanism.
InstalltheCDchangermechanismontheCDplayerbaseafter
the shift lever has been set in the highest position.
Figure 10-4
Figure 10-5
( L1 ) x1
ø3 x10mm
( L1 ) x1
ø3 x10mm
( K1 ) x1
ø3 x10mm
Turntable
Disc Tray
( K2 ) x1
( L2 ) x1
( L2 ) x1
CD Player Unit
Washer
( M1 ) x1
ø3 x10mm
( M2 ) x2
( M2 ) x2 CD Player Unit
CD Servo PWB
( N1 ) x4
ø3 x12mm
( P1 ) x1
ø2.6 x10mm
CD Changer
Mechanism
CD Mechanism
Shift Lever
CD Player Base
(F1)x1
ø3x8mm
(E2)x2
(E1)x2
ø3x8mm
(E1)x1
ø3x10mm
(E3)x1
(E5)x1
(E2)x2
(E4)x1
(G1)x1
Front Panel
Main PWB
Front Panel
Display PWB
Switch PWB
Open
Cassette
Holder
Tape Mechanism
(G2)x2
ø3x10mm
(G2)x10
ø3x10mm
(J1)x1
ø3x10mm (H1)x5
ø3x10mm
Headphones
PWB
(G1)x1
(J2)x1

– 11 –
CD-C622/C2900
CP-C622
1 Front Speaker 1. Front Panel ............ (A1) x1 11-1
2. Tip .......................... (A2) x2
3. Screw ..................... (A3) x4
STEP REMOVAL PROCEDURE FIGURE CP-C622
Figure 11-1
Figure 11-2
CP-C2900
CP-C2900
1 Front Speaker 1. Front Panel ............ (A1) x1 11-2
2. Tip .......................... (A2) x2
3. Screw ..................... (A3) x2
4. Screw ..................... (A4) x2
5. Screw ..................... (A5) x4
STEP REMOVAL PROCEDURE FIGURE
Note:
The rear speakers can be easily disassembled.
Therefore the disassembling method is not discribed.
For details refer to the disassembling drawing in the Parts
Guide.
Screw Driver
Woofer
Piezo (A3)x4
ø4x12mm (A2)x2
Front Panel
(A1)x1
(A4)x2
ø3x10mm
(A3)x2
ø3x10mm
Front Panel
(A1)x1
Screw Driver
Woofer
Tweeter
Super
Tweeter
(A5)x4
ø4x14mm
(A2)x2

CD-C622/C2900
– 12 –
How to remove the pickup (See Fig. 12-2)
1.Remove thescrews (B1) x2 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 12-2
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. 12-1)
1. Remove the screws (A1) x 2 pcs., to remove the loading
motor.
Figure 12-1
( A1 ) x2
ø2.6 x5mm
Loading / Up
/ Down Motor
Motor
PWB
( B1 ) x2
ø2.6 x6mm
Shaft
( B2 ) x1
Stop Washer
( B3 ) x1
Gear
( B4 ) x1
CD Mechanism
Pickup
Note
After removing the connector for the optical pickup fromthe
connectorwraptheconductivealuminiumfoilaroundthefront
end of connector so as to protect the optical pickup from
electrostatic damage.

– 13 –
CD-C622/C2900
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
Tape 2
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
Specified
Value
Adjusting
Point Instrument
Connection
Test Tape
Normal MTT-111 Volume in 3,000 ±Speaker
speed motor. 30 Hz terminal
(MM1) (Load
resistance:
8 ohms)
ADJUSTMENT
Specified Value
Tape 1
•Tape Speed
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna, Output: TP302
*2. Input: Antenna, Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
IF 450 kHz 1,720 kHz T351 *1
Band — 530 kHz (fL): T333 *2
Coverage 1.1 ±0.1 V
Tracking 990 kHz 990 kHz (fL): T331 *1
Test Stage Frequency Frequency
Display Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker terminal
•FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Band — 87.50 MHz L303(fL): *1
Coverage 3.4 V ±50 mV
RF 98.00 MHz 98.00 MHz L302 *2
(10-30 dB)
Test Stage Instrument
Connection
Frequency Frequency
Display Serring/
Adjusting
Point
•Detection
Signal generator: 10.7 MHz, FM sweep generator
Detection 10.7 MHz 98.00 MHz T352 Input: Pin 1 of
IC303
Output: TP302
IF 10.7 MHz 98.00 MHz T301(Turn Input: Pin 1 of
the core of IC301
transformer Output: TP302
T352 fully
counter-
clookwise.)
Instrument
Connection
Test
Stage Adjusting
Parts
Frequency
Display
Frequency
Adjusting
Parts Instrument Connection
Frequency
Display
Frequency
•VCO Frequency
* Adjust for 76 kHz ±200 Hz.
Notes:
After preparing the test circuit shown in Fig 13-2, 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.
Figure 13-2
98.00 MHz 98.00 MHz VR351* Pin 13, Pin 21
(60 dB) and ground
of IC303
Figure 13-1 ADJUSTMENT POINTS
TAPE MECHANISM
MM 1
Motor
Volume in motor
Pin 13 of IC303 Pin 21 of IC303
D
G
S
10 kΩ
TO FREQUENCY
COUNTER
FET : 2SK19 or 2SK54
IC301
IC303
MAIN PWB
13
1
1
21
FM BAND
COVERAGE fL
T301
L301
L303
TP301
L302
T351
T333
T352
T331
TP302
R340
VR351
VCO
AM IF
FM RF
FM DET
FM IF
AM TRACKING
fL
AM BAND
COVERAGE fL
CNP301
AM LOOP
ANTENNA

CD-C622/C2900
– 14 –
TEST MODE
Figure 14-2 Figure 14-3
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. 14-2)
2. Tracking offset (Fig. 14-3)
3. E/F balance (tracking error balance) (Fig. 14-4)
4. RF level AGC function (HF level: constant)
5. RF level automatic follow-up of the tracking gain
This automatic adjustment is performed each time a disc is changed. Therefore,
each disc is played back using the optimal settings.
CD SECTION Figure 14-1
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. 14-1)
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 14-4
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

– 15 –
CD-C622/C2900
•The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the chas-
sis 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
electrolyticcapacitor,theexpression“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 POSITION
SW714 TUNER/BAND ON—OFF
SW715 VIDEO ON—OFF
SW716 TAPE ON—OFF
SW717 CD 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
SWM 3 FOOL PROOF ON—OFF
SWM 4 F.A.S. ON—OFF
SWM 5 CAM ON—OFF
REF. NO DESCRIPTION
SW1 OPEN/CLOSE ON—OFF
SW2 MECHA UP ON—OFF
SW3 DISC NUMBER ON—OFF
SW4 PICKUP IN ON—OFF
SW701 POWER 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
Figure 15 TYPES OF TRANSISTOR AND LED
(1) (2) (3)
(S) (G) (D)
E C B
FRONT
VIEW
KTA1266 GR
2SA1015 GR
2SA1318
2SC3331
2SC535 C
KRA102 M
KRA109 M
KRC102 M
KRC104 M
KRC107 M
KTA1271 Y
KTA1273 Y
KTA1274 Y
KTD2058 Y
KTC3200 GR
KTC3203 Y
L1154GT4
SLI342YCB
SLI342DCB
SLI342UCB
SLI342YCJ
FRONT VIEW

CD-C622/C2900
– 16 –
WAVEFORMS OF CD CIRCUIT
3
5ms
0.50 V
IC1 20 F.E
1
5ms
5.0 V
IC1 54 DRF
STOP PLAY
FOCUS SERCH
1
3
5
4
2
6
7
8
9
10
11
3
4
5
6
7
8
9
6
7
8
10
11
12
9
6
7
8
9
12
0.5ms
1.00 V
HF
0.5ms
5.0 V
HFL
0.5ms
5.0 V
TES
1
2
3
CUE
0.5ms
1.00 V
HF
1
2
3
0.5ms
5.0 V
HFL
0.5ms
5.0 V
TES
REVIEW
50ms
10.0 V
JP+
CUE
50ms
10.0 V
JP-
50ms
0.50 V
JP
50ms
1.00 V
TE
0.5ms
10.0 V
JP+
0.5ms
10.0 V
JP-
0.5ms
0.50 V
JP
0.5ms
1.00 V
TE
REVIEW
50ms
10.0 V
JP+
50ms
10.0 V
JP-
50ms
0.50 V
JP
50ms
1.00 V
TE
0.5ms
10.0 V
JP+
0.5ms
10.0 V
JP-
0.5ms
0.50 V
JP
0.5ms
1.00 V
TE
PLAY
20ms
1.00 V
SPO
NORMAL DISC
TN0=01
20ms
2.00 V
CLV+
PLAY
TCD-712 (140mm)
TN0=01
50ms
1.00 V
SPO
50ms
2.00 V
CLV+
PLAY
TCD-712
5s
100mV
SLD
1
0.5s
100mV
SLD
1

– 17 –
CD-C622/C2900
Figure 17 BLOCK DIAGRAM (1/3)
27
1
2
3
4
1
8
6
7
18 24 40 20
4 5
15
23
16 26
27
7
2
2520
29
21 22 35
14
38
39 28 41 42
37 36
PU-IN SW
XL1
XIN
LD0
FIN2 JP–
CV+
SLC
SL1
FIN1 E F
TO
FD
SPO
NC
SLD
SL–
SL+
DRF
CL
DAT
CE
VCC1
6
+5V
PICKUP IN
SW4
FOCUS COIL
TRACKING COIL
M1
SPINDLE
MOTOR
M
M
M2
SLED
MOTOR
PICKUP UNIT
9
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 3623 43
37
31 38 39 40
24 25
10
1
2
2
1
3
3
2
1
4
5
6
10
265853
10 12 20
32 40 43 44
5352515431302923271615
4144
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
BI1B
2
1
BI1A
CNP99
+5V
2
4 8
33 38 39 46
~
646251
11
22

CD-C622/C2900
– 18 –
Figure 18 BLOCK DIAGRAM (2/3)
5 6
21
16
22
13
20
16
21
17
1 3
24 23
15
20
1
22
15
9
10
11
7
11
3 4 5 6
10
GNDAM IF FM DET
FM DET
FM IN
IC302
LC72131
PLL (TUNER)
OSC
VR351
MPX VCO ADJ
AM IF
AM MIX
AM IN AM+B
AM RF IN
X352
4.5MHz
FMOSC
AM TRACKING AM BAND
COVERAGE
T351
+B4 +B4
T352
IC303
LA1805
FM/AM IF MPX.
DET OUT
L
R
STEREO
AM OSC IN
Q343
Q350
VT
DO DI CL CE
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
17
+B4
VOLTAGE
REGURATER
SWM3
FOOL PROOF
SWM4
F.A.S
SOLM1
SOLENOID
SWM5
CAM
5
16
4
17
3
18
2
19
1
20
9
IC601
M62439SP
AUDIO PROCESSOR
L
L
R
R
L
RL
R
L
R
L
R
TUNER
AUX
TAPE
CD
3
IC704
1
+B7 2
BAIS
T1/T2
REC
MUTING
Q121
Q122
–B4
FM/AM
SWITCHING
13
8
9
1
2 3 4 5 7 8
6
Q302
FM IF IN
FM IF
FM RF
FM
OSC
T301
FM OSC
FM
ANTENNA
FM B.P.F
IC301
TA7358AP
FM FRONT END
L303
L302
OSC BUFF
L301
7
FM
Q344
FM +B
SWITCHING
CF301
FM+B MO/ST
VCO
FM/AM
BIAS
OCS
15 19
11 10
MONO/ST
JK601
VIDEO/AUX
MPXIN
AM LOOP
ANTENNA
T331 T333
CF351

– 19 –
CD-C622/C2900
Figure 19 BLOCK DIAGRAM (3/3)
Q704
315
9
10
11
R
351
V
CO ADJ
L
R
Q343
+B4
A
GE
A
TER
SWM3
P
ROOF
SWM4
F.A.S
S
OLM1
E
NOID
SWM5
CAM 1 2 3 4
15 2516 26 28 373839
FL701
DISPLAY
9 8 7 6 5 4 3 2 1
IC701
IX0280AW
SYSTEM CONTROL
MICROCOMPUTER
P
E
SSOR
L
R
VDD
UNSWITCH
+B7
MEMORY
BACK UP
VDD
XL701
4.19MHz
+B5 +B7
KEY
SW701
~SW730
Q908
+B5
M
Q960
+B1
RL901
622
ONLY
TO CD
SECTION
M901
FAN MOTOR
JK970
HEADPHONES
SO901
SPEAKER
TERMINAL
T.F
T801
POWER
TRONSFORMER
RL801
AC POWER
SUPPLY CORD
AC 120V, 60Hz
T802
POWER
TRONSFORMER
Q803
Q802
+B6
+B7 UNSWITCH
3
IC704
1 2
BAIS
T1/T2
REC
U
TING
Q
121
Q
122
–B4
A
M
T
CHING
D801
D803~D806
Q801 D807
~D809
2 3
1
+B7
RX701
Q705
Q706
Q707
2
1 3
6
7 L-OUT
IC901
STK40704
POWER AMP.
–B +B R-OUT
13
8
Q601
Q602
ZD801
Q603
Q604
+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
MO/ST
C
O
FM/AM
~~~
14
10
15
101112131415161718192021222324
25
2627
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
737260595857
56
5554
535251
MONO/ST
VDD
PHM1
N
D810~D813
FRONT
FRONT
SPEAKER
REAR
SPEAKER
F802
4A/125V
F803
4A/125V
F805
2A/250V
29 36
~
M
MM1
TAPE MOTOR
+B7
+B7

CD-C622/C2900
– 20 –
Figure 20 SCHEMATIC DIAGRAM (1/10)
A
B
C
D
E
F
G
H
123456
• NOTES ON SCHEMATIC DIAGRAM can be found on page 15.
D1
1SS133
C77
100/16
R36
220K
C57
0.001
R1
22
R35
220K
C21
0.0033
C20
47/16
C82
100/16
C55
100/16
R56
6.8K
C36
100/16
IC3
M63001FP
FOCUS/TRACKING/SPIN
/SLED DRIVER
C37
0.022
R47
10K
C25
27P R39
1K
C15
0.01
R41
47K
R43
56K
R44
33K
R42
47K
R28
10K
R29
56K
C17
0.001
R30
6.8K
R19
1K
C3
1/50
R34
3.3K
R11
6.8K
C6
0.033
R10
2.2K C5
0.033
C54
0.001
R8
15K
R9
100K
C16
0.0047
R27
39K
R25
1.5K
R23
10K
R24
47K
R17
33K
C29
4.7/50
C28
0.1
C14
0.01
C4
0.1/50
C35
1/50
Q1
2SA1318
R18
15K
C11
0.1
IC1
LA9241M
SERVO AMP.
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
16
15
14
13
12
11
1
0
9
8
7
6
5
4
3
2
1
C13
330P
R26
82K
R37
82K
C19
1/50
R33
1.2K R32
10K
C32
0.01
C31
220/6.3
C30
0.1/50
C27
0.001
C24
2.2P
R40
5.6K
C26
0.033
R31
1.2K
C18
0.47/50
R16
3.3K
C10
180P
C8
0.068
C7
0.1/50
R12
100
C9
0.047
R13
1K
R14
27K
C12
0.1
R2
1K C1
47/16
C2
0.01
R46
560
R38
470
C23
0.0027
R45
4.7K
C22
220P
R22
820
R21
1.5K
C34
0.33/50
C33
0.47/50
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
R15
12K
CNP1
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
19
20
21
42
41
40
39
38
37
C76
0.022
CNP12
CNP2
CNS12
P29 12 - B
TO DISPLAY P
W
CNP3
6
5
4
3
2
1
2
3
4
5
1
CNS1A
CNS1B
2
3
4
5
1
CNS2B CNS2A
6
5
4
3
2
6
5
4
3
2
1
CNS3B
1
CNS3A
6
5
4
3
2
1
CNP3A
2
3
4
5
1
PICKUP UNIT
CD MOTOR PWB-C
M
M2
SLED
MOTOR
M
M1
SPINDLE
MOTOR
SW4
PICKUP
IN
SL_+
SL_–
CD_PUIN
SP+
SP–
(SPN)VCC2
VCC4
LD_M+
LD_M–
VCC3
M–
M+
SOL+
SOL–
SP–
SP+
SPO
SOL–
SOLD
MUTE
Vref
STANDBY
VCC1
SLD
SL–
SL+
GNDGND
TR+
TR–
FO–
FO+
FO (GAIN)
FD
TO
GND
HF
TP1
TE
NC
NC
TBC
JPCLO
SLOF
SLOF
SLOF
FSC
FE1
FOSTA
FSC
EFBAL
REF
JP
REF
REF
CV+
CV–
JP–
JP+
2FREQ
LASER
8/12CM
FSTA
S.Q.R
FOSTA
TOSTA
LATOH
FSTA
SLOF
CL
CE
DRF
HFL
DEF
VCC
THD
GL
THDL
TGL1
VCR
VCR
VCR
VCR
FE1
REF
REF
RF
REF
DGND
SLI
FIN2
FIN1
EREF
F
TB
TE–
TE
TESI
SCI
REF
REF
REF
REF REF
REF
REF
REF
REF
REF
TO
REF
JP
REF
TH
TD
TD–
JP
TO
FD
GEN
GEN
GEN
FD–
FA–
FA FE
FE–
AGND
SP
SPI
SPG
SP–
SPO
SLEO SLD
SL– SL+
REF
REF
REF
REF
OR
REF
RF
SLC
RFS–
RFSM
JP–
JP+
TGL
TOFF
TES
HFL
SLOF
CV–
CV+
–
+
–
+
–
+
RES(DSP) WRQ(DSP) RWC(DSP) CQ CK(DSP) CO IN(DSP) SQ OUT(DSP) DRF(ASP) D_GND SLD+ SLD–
VCC1
DEF
CLK
DAT
CL
CE
DRFFSS
VCC2
REF1
VR
LF2
PHI
LDO
BHI
LDS
K
A
B
E
F
PD
TR–
TR+
FO+
FO–
LD
+B
+B
+B
+B +B
+B
+B
+B
VREF
+B
F
B
A
E
K
TR–
TR+
FO+
FO–
GND
PD
VR
LD
CD_GND
LD
K
E
B
LD GND
A
F
C
LT0H30M1
TR–
TR+
FO+
FO–
GND
PD
VR
LD
MON
TR+
FO+
FO–
ACTUATOR
TR–
F
B
A
E
K
+
–
+
–
1
0
9
8
7
65
4
3
21
5
4
3
2
1
8
7
6
5
4
3
2
1
8
4
1
8
1
7
2
3
7
3
4
6 6
5
5
2
1
8
3
7
4
6
5
2
R20
1K
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
2
3
4
5
6
7
10
1
8
9