Sharp CD-C290X User manual

– 1 –
CD-C290X
SERVICE MANUAL
No. S9910CDC290X
CONTENTS Page
SAFETY PRECAUTION FOR SEVICE 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
WAVEFORMS OF CD CIRCUIT..................................................................................................................................... 16
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD.............................................................................................17
TROUBLESHOOTING (CD CHANGER CONTROL / CD SECTION) ............................................................................ 34
FUNCTION TABLE OF IC .............................................................................................................................................. 38
FL DISPLAY.....................................................................................................................................................................45
REPLACEMENT PARTS LIST/EXPLODED VIEW
SHARP CORPORATION
CD-C290X mini component system consisting of
CD-C290X mini component system,CP-C290
speaker system.
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
CD-C290X
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
●SRS technology Licensed from SRS Labs. SRS technol-
ogy holds the following patents: U.S. Patent No.
4,748,669 and U.S. Patent No. 4,841,572.
●SRS, the SRS Logo (●) and the Sound Retrieval System
are registered trademarks of SRS Labs, Inc. in the United
States.

CD-C290X
– 2 –
SAFETY PRECAUTION FOR
SERVICE MANUAL
Precaution to be taken when replacing and servicing the
Laser Pickup.
The AEL (Accessible Emission Level) of Laser Power Output
forthismodelisspecifiedtobelowerthanClassIRequirements.
However, the following precautions must be observed during
servicing to protect your eyes against exposure to the Laser
beam
(1) When the cabinet has been removed, the power is turned
on without a compact disc, and the Pickup is on a position
outerthanthelead-inposition,theLaserwilllightforseveral
seconds to detect a disc. Do not look into the Pickup Lens.
(2) The Laser Power Output of the Pickup inside the unit and
replacementservicepartshavealreadybeenadjustedprior
to shipping.
(3) No adjustment to the Laser Power should be attempted
when replacing or servicing the Pickup.
(4) Under no circumstances look directly into the Pickup Lens
at any time.
(5)CAUTION -Use ofcontrols oradjustments, orperformance
of procedures other than those specified herein may result
in hazardous radiation exposure.
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
VOLTAGE SELECTION
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.
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 proce-
dures other than those specified herein may result in haz-
ardous 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
The voltage selector is located on the AC voltage selector box. If adjustment is necessary, ensure to remove plug of AC cord from
ACsocket anduseascrewdriverto turntheselectorineitherdirection.The correctvoltagefigureisdisplayedinthe windowbelow
to the adjustment screw.
Figure 2 POWER SUPPLY CORD AND PLUG ADAPTOR
QACCE0007AW00
QPLGA0004AWZZ

–3 –
CD-C290X
SPECIFICATIONS
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
Specifications for this model are subject to change
without prior notice.
General
Power source: AC 110/127/220/230-240 V,
50/60 Hz
Power consumption: 47 W
Dimensions: Width; 270 mm (10-5/8")
Height; 303 mm (11-13/16")
Depth; 341 mm (13-7/16")
Weight: 5.6 kg (12.3 lbs.)
Amplifier section
Output power: PMPO; 600 W (total)
MPO; 60 W (30 W + 30 W)
(10 % T.H.D.)
RMS; 40 W (20 W + 20 W)
(10 % T.H.D.)
RMS; 28 W (14 W + 14 W)
(0.9 % T.H.D.)
Output terminals: Speakers; 4 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
Input terminals: Video/Auxiliary (audio signal);
245 mV/47 kohms
Tuner section
Frequency range: FM; 88-108 MHz
AM; 531-1,602 kHz
Cassette deck section
Frequency
response: 50-14,000 Hz (Normal tape)
Signal/noise ratio: 55 dB (TAPE 1, playback)
50 dB (TAPE 2, recording/
playback)
Wow and flutter: 0.15 % (WRMS)
Compact disc player section
Type: 3-disc multi-play compact disc player
Signal readout: Non-contact, 3-beam semi-
conductor laser pickup
D/A converter: 1-bit D/A converter
Frequency response: 20 - 20,000 Hz
Dynamic range: 90 dB (1 kHz)
Speaker section
Type: 2-way [10 cm (4") woofer and 5 cm
(2") tweeter]
Rated input power: 20 W
Maximum input power: 40 W
Impedance: 4 ohms
Dimensions: Width; 180 mm (7-1/8")
Height; 300 mm (11-13/16")
Depth; 204 mm (8-1/16")
Weight: 2.1 kg (4.6 lbs.)/each

CD-C290X
–4 –
NAMES OF PARTS
CD-C290X
123
4
MEMORY ST
kHz
MHz
1 2 3
REC SLEEP X-BASS
SRS ( )
56789
10 1112
14
15 16
13
17 18 19 20 21
22
23
24 25 26 27 28 29
30
31
32 33
Front panel
11. Disc Tray
12. Disc Number Select Buttons
13. Disc Skip Button
14. Open/Close Button:
15. Disc Number Indicator
16. Timer Indicator
17. Record Indicator
18. Sleep Indicator
19. Extra Bass Indicator: X-BASS
10. Memory Indicator
11. FM Stereo Mode Indicator: ST
12. FM Stereo Indicator:
13. CD Play Indicator:
14. CD Repeat Indicator:
15. SRS Indicator: SRS ( )
16. CD Pause Indicator:
17. On/Stand-by Button
18. Memory/Set Button
19. Record Pause Button:
20. Extra Bass/Equalizer Mode Button: X-BASS
21. Volume Up/Down Buttons: /
22. Function Selector Buttons
23. Clock Button
24. Timer/Sleep Button
25. (CD) Track Down/Review Button:
3(TUNER) Preset Down Button:
26. Stop Button:
27. Play/Repeat Button:
28. (CD) Track Up/Cue Button:
3(TUNER) Preset Up Button:
29. 3D Surround Mode Button
30. Tuning and Time Up/Down Buttons:
31. Headphone Socket
32. (TAPE 1) Cassette Compartment
33. (TAPE 2) Cassette Compartment

–5 –
CD-C290X
CP-C290
1
2
3
4
5
6
7
8
9
12
11
10
1
2
3
4
5
6
7
11
12
109
8
14
13
15
19
23
20
18
17
16
22
21
Rear panel
11. Span Selector Switch
12. Speaker Terminals
13. AC Voltage Selector
14. AC Power Input Socket
15. Video/Auxiliary (Audio Signal) Input Sockets
16. FM 75 Ohms Aerial Terminal
17. Aerial Earth Terminal
18. AM Aerial Terminal
Speaker section
19. Tweeter
10. Woofer
11. Bass Reflex Duct
12. Speaker Wire
Remote control
11. Remote Control Transmitter LED
CD control section
12. Disc Number Select Buttons
13. Track Down/Review Button: /
14. Track Up/Cue Button: /
15. Disc Skip Button
16. Play/Repeat Button:
17. Stop Button:
18. Memory Button
19. 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. 3D Surround Mode Button
22. On/Stand-by Button
23. Volume Up/Down Buttons: /

CD-C290X
–6 –
OPERATION MANUAL
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.
1Press the ON/STAND-BY button to enter the stand-by mode. 2While pressing down the VOLUME button and the
button, hold down the ON/STAND-BY button for at least
1 second.
1,2
2
2Caution:
The operation explained above will erase all data stored in
memory including clock and timer settings, and tuner and CD
presets.
SETTING THE CLOCK
1Press the ON/STAND-BY button to enter the stand-by mode. 2Press the CLOCK button. 3Within 5 seconds, press the MEMORY/SET button. 4Press 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 (see page 17).
5Press the MEMORY/SET button.
6Press 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".
7Press the MEMORY/SET button. 8Press 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".
9Press 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.
ON/
STAND-BY
CLOCK
MEMORY/
SET
TUNING/
TIME
( )
AM 0:00AM 12:00 0:00
2
3
4
7
6
5
8
9If this happens, follow the procedure below to change the
clock time.
To change the clock time:
When the unit is in the stand-by mode:
Press the MEMORY/SET button. Perform steps 6 - 9 above.
When the unit is on:
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 17.
Perform steps 1 - 9 above.
(Main unit operation)
In this example, the clock is set for the
24-hour (0:00) system.
PREPARTION FOR USE
Notes concerning use:
Replace the batteries if the operating distance becomes re-
duced or if 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
interfere with operation. Change the lighting or the direction
of the unit.
Keep the remote control away from moisture, excessive heat,
shock, and vibrations.
15
15
15
15
0.2 m - 6 m
(8" - 20')

–7 –
CD-C290X
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.Takeoffnylon bands or wireholderswherethey need to
beremovedwhendisassemblingtheunit.Afterservicing
theunit,besure to rearrange theleadswheretheywere
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 7-2
Figure 7-3
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
5. Flat Wire................ (C4) x1 7-3
4. Socket ................... (C5) x1
4 Back Board 1. Screw .................... (D1) x6 7-2
5 Tuner PWB 1. Screw .................... (E1) x3 8-1
2. Socket ................... (E2) x1
6 Switch PWB/ 1. Screw .................... (F1) x6 8-1.2
Display PWB/ 2. Screw .................... (F2) x1
3. Screw .................... (F3) x1
Main PWB/ 4. Socket ................... (F4) x4
7 Front Panel 1. Screw .................... (G1) x3 8-2
2. Hook...................... (G2) x2
8 Tape Mechanism 1. Open the cassette holder. 8-2
2. Screw .................... (H1) x6
9 SRS PWB 1.Screw ..................... (J1) x1 8-3
10 Turntable 1. Screw .................... (K1) x1 8-4
2. Cover .................... (K2) x1
11 Disc Tray 1. Screw .................... (L1) x2 8-4
2. Guide .................... (L2) x2
12 CD Changer 1. Screw .................... (M1) x4 8-5
Mechanism
13 CD Mechanism 1. Screw .................... (N1) x1 8-5
STEP REMOVAL PROCEDURE FIGURE
Note 1:
How to open the changer manually. (Fig.7-4)
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.
Figure 7-1
CD-C290X
CD-C290X
( B1 ) x1
ø3 x10mm
( B2 ) x2
ø3 x12mm
( B2 ) x2
ø3 x12mm
( B1 ) x1
ø3 x10mm
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 ) x6
ø3 x8mm
Hook
( C1) x3
( C2 ) x1
( C3 ) x4
Back Board
Main PWB
Front Panel
1
1
2
A
Pull
(C2) x1
LOCK
LEVER
< A >
Figure 7-4
Front
Panel
( C4 ) x1 ( C5 ) x1
SRS PWB CD Player Unit

CD-C290X
–8 –
Figure 8-1
Figure 8-2
Figure 8-3
Figure 8-5
Be careful when installing the CD changer mechanism.
InstalltheCDchangermechanismontheCDplayerbaseafter
the shift lever has been set in the highest position.
( F4 ) x2
( F4 ) x1
( E2 ) x1
( F2 ) x1
ø3 x10mm
( F3 ) x1
ø3 x8mm
( F1 ) x3
ø3 x10mm
( E1 ) x2
ø3 x8mm
( E1 ) x1
ø3 x8mm
( F1 ) x3
ø3 x10mm
Main PWB
Tuner PWB
Display
PWB
Switch PWB
Front Panel
( F4 ) x1
( G1 ) x3
ø3x10mm
( H1 ) x6
ø3x10mm
(G2 ) x1
(G2 ) x1
Tape
Mechanism
Cassette
Holder
Front Panel
Power PWB
Open
( L1 ) x1
ø2 x 4mm
( L1 ) x1
ø2 x 4mm
( K1 ) x1
ø3 x10mm
Turntable
Disc Tray
( K2 ) x1
( L2 ) x1
( L2 ) x1
CD Player Unit
Washer
( J1 ) x1
ø3 x10mm
Loading Chassis
SRS PWB
Figure 8-4
( M1 ) x4
ø2.6 x 5mm
( N1 ) x1
ø2.6 x10mm
CD Changer
Mechanism
CD Mechanism
Shift Lever
CD Player Base

–9 –
CD-C290X
1 Front Speaker 1. Net Frame .............. (A1) x1 9-1
2. Duct Panel ............. (A2) x1
3. Screw ..................... (A3) x4
4. Screw ..................... (A4) x4
Figure 9-1
CP-C290X
STEP REMOVAL PROCEDURE FIGURE
Notes:
TheSurroundspeakers canbeeasilydisassembled.Therefore
the disassembling method is not discribed.For details refer to
the disassembling drawing in the Parts Guide.
Figure 9-3
Figure 9-2
How to remove the pickup (See Fig. 9-3)
1. Remove the screws (B1) x 2 pcs., to remove the shaft (B2)
x 1 pc.
2. Remove the stop washer (B3) x 1 pc., to remove the gear
(B4) x 1 pc.
3. Remove the pickup.
REMOVING AND REINSTALLINGTHE 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. 9-2)
1. Remove the screws (A1) x 2 pcs., to remove the loading
motor.
( 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
Screwdriver
Woofer
Tweeter
Net Frame
( A1 ) x1 ( A3 ) x4
ø4x14mm
( A4 ) x4
ø4x14mm
Duct Panel
( A2 ) x1

CD-C290X
–10 –
ADJUSTMENT
Figure 10 ADJUSTMENT POINTS
TUNER SECTION
Test Stage Frequency 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 (fL): T302 *1
Tracking
*1. Input: Antenna, Output: TP302
*2. Input: Antenna, Output: TP301
fL: Low-range frequency
fH: High-renge frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
• 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
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)
Specified Value
Tape 1
•Tape Speed
TAPE MECHANISM
MM 1
Motor
Volume in motor
TUNER PWB
SO301
ANTENNA
TERMINAL
FE301
TP302
R357
T351 T306
T302
VR351
AM IF FM MUTE
LEVEL
AM BAND
COVERAGE AM TRACKING
TP301
R336

–11 –
CD-C290X
TEST MODE
2
1
TO
TE
200 ms
1V/diV
IC 1 15
200 ms
1V/diV
IC 1 7
TRACKING/
ERROR
BARANCE
ADJUST
Figure 11-2 Figure 11-3
2
1
10ms
0.50 V
IC1 20 FE
10ms
0.50 V
IC1 7 TE
Enlarged
View
TRACKING
OFF-SET
ADJUST
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 (è) or (È) 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 (è) or (È) 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
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
Figure 11-4
IL is not performed.
<STOP>
123

CD-C290X
–12 –
SW714 TIMER/SLEEP ON—OFF
SW715 MEMORY ON—OFF
SW716 CD ON—OFF
SW717 TUNER/BAND ON—OFF
SW718 TAPE 1-2 ON—OFF
SW719 VIDEO/AUX ON—OFF
SW720 DISC 1 ON—OFF
SW721 DISC 2 ON—OFF
SW722 DISC 3 ON—OFF
SW723 DISC SKIP ON—OFF
SW724 OPEN/CLOSE ON—OFF
SW725 SPAN SELECTOR 100/10—50/9
SW901 VOLTAGE SELECTOR 110—127—
220—230-240
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
SW701 3D SURROUND 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/TIME ON—OFF
SW711 TUNING DOWN/TIME ON—OFF
SW712 ON/STAND-BY ON—OFF
SW713 CLOCK ON—OFF
•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
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 POSITIONREF. NO DESCRIPTION
Figure 12 TYPES OF TRANSISTOR AND LED
KRC102 M
KRC104 M
KRC107 M
KTA1266 GR
KTA1271 Y
KTC3199 GR
KTC3203 Y
2SK246 GR
KTA1273 Y
KTC3200 GR
E
(1)
(S)
C
(2)
(G)
B
(3)
(D)
FRONT
VIEW
B
(3)C (2)E (1)
FRONT
VIEW
FRONT VIEW
KV1236Z23F
FRONT
VIEW
333GTH2

–13 –
CD-C290X
Figure 13 BLOCK DIAGRAM (1/3)
1
2
3
4
14
5
98
6
7
17
20
12
13
24
25
30
31
3222
10 11
27
26
28
29
PU-IN SW
XL1
XIN
LDO
FIN2 JP–
CV+
SLC
SLI
FIN1
E
F
TO
FD
SPO
SP
SLD
SL–
SL+
DRF
CL
DAT
CE
VCC1
6
PICKUP IN
SW4
FOCUS COIL
TRACKING COIL
M1
DISC
MOTOR
M
M
M2
SLED
MOTOR
PICKUP UNIT
9
IC2
LC78622K
SERVO/SIGNAL
CONTROL
+B1
IC5
M56748FP
DRIVER
IC1
LA9241M
SERVO AMP.
6
1
95
+B1
+B1
+12V
+5V
( 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
62 64 56 55 45 3623 43
37
38
39
40
24
25
10 10
265853
10
12
20
32
40
43
44
5352515431302923271615
4144
Q1
TO MAIN SECTION
IC91
TA7291
LODING MOTOR
DRIVER
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
SOLM2
SOLENOID
TO MAIN(IC601) &
DISPLAY SECTION
CNS10
+B5

CD-C290X
–14 –
Figure 14 BLOCK DIAGRAM (2/3)
22
45
1
3
7
6
8
17
15
14
11 12
16
18
12
10
13
6
13
10
7
21
22
23
24
20
3
2917
98
5
42
7
5
4398 6
21
1
20 11
15 16
1
2
AM ANT. AM OSC.
X352
4.5MHz
IC302
LC72131
PLL(TUNER)
FM IF DET/FM MPX/AM IF
IF
OUT
IC303
LA1832
+B4 CF351 X351
+B4
MPX
PHASE Q361
+B4
T1 RUN
T2 RUN
MECHA STOP
FOOL PROOF
TUNER MUTE
SD
VOLTAGE
REGURATER
+B4
+5V
VF2
(AC)
TA MOT SW
TA SOL
FM +B
XT21
VT
T306T302
CF302
DO
CE
SRS ON/OFF
SRS 1/2
CL
DI
FM FRONT END
FE301
Q360
Q371
Q703
Q706
MUTING
MPX
VCO
CUT
RL
Q353
Q354
MPX
IN
FM/AM
OUT
IF IN
SD
FM MONO/ST MONO/ST
AM RF IN
AFC
IN
OUT
VR351
FM MUTE LEVEL AM OSC
REG INOUT VCC
FM IF IN
FM IF
FM OSC.
STEREO
AM IN
FM IN
FMOSC
T351
AM IF
GND
OSC.
FM
AM RF
SWM4
F.A.S
SWM3
FOOL PROOF
SWM5
MM1
TAPE
MOTOR
M
SOLM1
+B5
SOLENOID
PHM1
CAM
SO301
ANTENNA
TERMINAL
FM
75 OHMS
AM
+B4
SO401
AUX IN
CNP303
CN7
L-CH
R-CH
PB HEAD 1
2
3
4
L NF
L (T1)
R (T1)
L (T2)
R (T2)
R NF
4
5
13
21
24
23
18
17
10
1915
12
14
16
20
H/N
67
8
9
T1/T2
POP REDUCE
L REC
R REC R NF
REC
L NF
P.B.
REC
L-CH
R-CH
REC/PB
HEAD
ERASE
HEAD
BIAS
OCS
REF ALC
HIGH
NOR/ T1/T2
+
+
+B5
+B4
PLAYBACK&RECORD/
PLAYBACK AMP.
IC501
AN7345K
L
RP.B
TAPE
VIDEO
TUNER
CD
FROM CD SECTION
Q571
L501 Q566 Q565 BIAS
Q511
Q514
~
P.BREC
AC BIAS
Q515
Q516 Q583
Q581
Q584
Q582
T1/T2
MUTING
REC MUTE
Q575
Q576
REC/P.B.
+B4
+B4
+B4
L
R
TAPE 1
TAPE 2
R
L
SWITCHING
SWITCHING
SWITCHING
SWITCHING
+B6 (
+
TO CD SECTION
TO
SWITCHING
BIAS
3
2
1

–15 –
CD-C290X
Figure 15 BLOCK DIAGRAM (3/3)
SO901
VF1
(AC)
+B3
+B7+B8
MEMORY
BACK UP
–VP Q701
FL701
13
4
311
MUTE
L
R
R
L-OUT
R-OUT
92
5
12
R-IN
L-IN
7VCC
14 NF
8
+12V (DRIVER)
+12V (AUDIO)
+B5
+B4
OUT
L
R
IC961
LA4450
POWER AMP.
+B4
VDD
X-BASS
VCC
MODE
R/L IN
R/L OUT
VSS VREF LVREF RVREF AVSS
GRAPHIC EQUALIZER
VOLUME 58
55
R
R
L
L
L
TAPE
VIDEO
TUNER
CD
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
VOLTAGE
REGULATOR
+B2
+B3
+
–
JA961
HEADPHONES
+5V
+5V
+B1 +5V
+B6 (MECHA)
(UCOM)
+12V
I
ON
TO CD SECTION
IC941
VF1
–VP
VF2
IC942
IC401
LC75394E
AUDIO PROCESSOR
IC201
SRS5250S
SRS
23
16
33
17
32
19
30
21
28
14 35 56 63 50 26
15192425 1011 23
1
26
27 12 37 11 38 10 39 13 36 14 35
781817
24 25 57
CL
DI
CE
PT901
POWER TRANSFORMER
VOLTAGE
REGULATOR
Q901
Q941
Q206
Q201
D909
D911 F902
T1.6A L 250V
F941
T500mA L 250V
F901
T3.15A L 250V
~
D905 ~ D908
D901 ~ D904
ZD901
9
43
640
8
44
541
7
45
442
+
–
SO961
SPEAKER TERMINAL
SPEAKERS
MIN. 4 OHMS
AC 110/127/220/
230-240V 50/60Hz
AC POWER
SUPPLY CORD
TF901
110V 230V-240V
220V
127V
SW901
VOLTAGE
SELECTOR
25
27
29
30
33
34
35
36
37
38
39
40
42 4143444546474849505152535455565859
60
65
70
57
2423222120191817
77
79
80
72
71
16151413121110
9
~
6
1
~
~
~
~
~
78
1RX701
REMOTE
SENSOR
2
3
SYSTEM STOP
DO
DRF
DI
CE
CL
RESET
XL702
4.19MHz
AVDD
AVREF
VDD +B7
KEY
SW701
SW719
SW720
SW724
TO POWER SECTION
RESET
Q704
Q705
ZD701
Q810
Q811
Q812
LED810
LED815
+B7
+B8
+B8
+B8
~
61
64
~
POWER
TUN SD
Q702
IC701
IX0191AW
SYSTEM CONTROL
MICROCOMPUTER
TO CD SECTION
TO CD SECTION
TO CD SECTION
TO CD SECTION
TO CD SECTION
CD PUIN
CD SL+
CD SL–
VDD
TAPE SOL
TAPE MOTOR
TAPE MECHA STOP
TAPE F.P.
T1 RUN PLSE
L-CH INPUT
R-CH INPUT
T2 RRUN PLSE CD UP DOWN/DISC NO
CD DSP RES
CD T/T OPEN/CLOSE
RESET CD DSP SQOUT CD DSP COIN CD DSP RWC
CD DSP CQCK
CD DSP WRQ T1/T2 TAPE REC TAPE BIAS
3~ 3330 31 32
Q205

CD-C290X
– 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-C290X
Figure 17 WIRING SIDE OF P.W.BOARD (1/6)
A
B
C
D
E
F
G
H
123456
CNSM1
CNPM1
TO TAPE MECHANISM PWB
P20 5-D
FW702
FW702
FW702
TO MAIN PWB
P19 10-A
TO MAIN PWB
P19 7-A
TO MAIN PWB
P18 4-A
R759
R758
R757
R756
R807
R808
R809
R812
R811
R810
SW724
OPEN/CLOSE
SW723
DISC SKIP
SW722
DISC 3
SW721
DISC 2
SW720
DISC 1
1
6
CNS701
DISPLAY PWB-A2 SWITCH PWB-A3
SW703
X-BASS
EQUALIZER
SW706
FF/PRESET
SW709
REW/
PRESET
SW715
MEMORY
/SET
R779
MELF
SW717
TUNER
(BAND)
SW704
VOLUME UP
SW702
VOLUME DOWN
C711
D705 C709
D702
D701
ZD701
C719
C718
RX701
R785
SW710
TUNING UP
/TIME
D703
CNS704
Q705
R730
R715
R717
SW708
PLAY
SW705
REC PAUSE
DEMO
SW701
3D
SURROUND
1
1
11
9
SW711
TUNING DOWN
/TIME
D704
L701
C710
Q701
Q702
Q704
BCE
BCE
123
1
2
3
321
C702
R729
R728
R731
R727
R733
R734
CNS703
SW707
STOP
XL701
CNS701
SW712
ON/STAND-BY
1
6
R762 R763
R760
R764
R796
R745
R744
SW714
TIMER/SLEEP
D706 D707
SW713
CLOCK
CNS702
Q703
C716
1
11
SW719
VIDEO/AUX
CNS705
18
D708
R813
Q706
SW716
CD
SW718
TAPE
(1 2)
R746
FL701
RD
WH
GY
WH
GY
WH
GY
WH
1
2
3
4
5
6
7
8
9
10
11
12
E
C
B
E
C
B
Q811
1
2
3
Q812
123
Q810
123
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1LED810
LED811
LED812
LED813
LED814
LED815
R711 R712
R707
R814
C720
R782
R801
R787
R798R800
R781
R797
R780
R784
R786
R799
R806
R723
R710
C714
C701
R732
R724
R725 R726
R702
R716
R718
R719
R720 R721
R722
R804
C713
R740
R741
R739
R742
R735
R736
R753
R752
R751
R750
1
5
10
15
20
24
30 35
40 41
45 50 55 60 64
65
70
75
80
25
C708
C707
C715
R773
R774
R775
R776
R777
R778
R743 R765
R795
R793
C712
R769
R771
R770
R768
R767
R766
R788
R789
R791 R790
R747 R748
R749
R803
R783
R805
C717
R802
IC701
R761

CD-C290X
–18 –
•The numbers 1 to 12 are waveform numbers shown in page 16.
Figure 18 WIRING SIDE OF P.W.BOARD (2/6)
A
B
C
D
E
F
G
H
123456
FW703
FW704
TO DISPLAY PWB
P17 1-B TO DISPL
A
P17
1
BR
COLOR TABLE
RD(R)
OR
YL
GR
BL
VL
GY
WH(W)
BK
PK
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
BLACK
PINK
JK961
HEADPHONES
HEADPHONE PWB-A4
15
CNS902
R981
R982
R536
C555
C561
R501
LUG961
L501
C572
R568
CNS704 Q581 Q582
C581
19
Q512
C570
Q566
C571
R584
Q565
Q576
R578
R538
C534
C532
C540
C556
C562
R563
R943
R942
C564
C558
C942
C946
IC942
IC941
3
2
1
3
B
BCE
BCE
BCE
BCE
BCE
BCE
ECB
321
CE
2
1
C944
C947
C943
C945
Q941
C973
C969
C970
LUG962
R971
C974
C968
C966
C979
C977
C964
C967
C963
R973
R972
C980 C978
C976
C965
SO962
SPEAKER TERMINAL
SPEAKERS
4 OHMS MIN.
RIGHT LEFT
SPA
N
R975
CNS902
1
5
C975
C941
C948
C949
C531
C539
C565 C563
CNP501
Q516
Q515
Q583
R510
R535
R519
Q584
R515
C533
Q575
R575
C583
11
R537
C544
R577
C557
C403
D81
C404
R404
C454 C462
C424
C426
C428
C430
C432
C991
C992
R431
D401
C452
C446
C448
C449
C450
C451
C
4
IC961
Q513
Q514
Q571
CNP502 1
1
24
510 2015
12
13
123
234567
Q511
IC501
CNP901
1
2
3
4
5
6
7
CNS
7
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CNS502
TO
TAPE
MECHANISUM
TAPE2 HEAD
P20 5-H CNS501
TO
TAPE
MECHANISUM
TAPE1 HEAD
P20 4-H
CNS901
TO
POWER PWB
P20 1-B
E
ECB ECB
E
C
B
1
2
3
1
2
3
CB
ECB
F941
T500mA L 250V
5
0
L963
C418
C9
2
R585
R541
R576
R565
R571
R570
R569
R566
R540
R511
R513
R514
R512
C512
C511
R583
R582
R581
R516
R518
R517
C514
C513
R520
C520
C504
R502
C519
C501
C502
R531
R533 C535
C543
C553
R553
R557
R561
C559R562
R532
R534
C536
R542 C554
R554
R556
C560
R560
R558
R552
R969
C962
R962
R966
R968
R961
C961
R965
R967
R4
5
R432
R420
C444
C442
R539
R551
R555
R559
R941
C503
R567
48
49

–19 –
CD-C290X
Figure 19 WIRING SIDE OF P.W.BOARD (3/6)
FW702
FW703
TO DISPLAY PWB
P17 1-D TO DISPLAY PWB
P17 1-G
1
RIGHT
SW725
SPAN SELECTOR LEFT
VIDEO/AUX
C533
Q575
R575
1
11
R537
5
44
R577
7
C403
D81
C404
R403
R404
C454 C462
C424
C426
C428
C430
C432
C991
C992
R431
D401
C452
C446
C448
C449
C450
C451
C445
C447
R421
R701
CNP901
1
2
3
4
5
6
7
IC2
IC1
ECB
R14
C43
CNS703
C68
C67
C408
R408
C416
C422
R402
R401
C421
C429 C431
SO401
C401
C402
C427
C425
C415
C461
C423
C455
C50
R406
R407
R427
R426
R425
1
6
R405
C406
CNS201
C407
C45
C41
C42
C59
C34
C35
C37
R18
C52
D7
C58
D5
L1
Q93
C91
R98
C21
R54
D2
R26
R96
Q91
123456789
D91
R28
C11
C19
C17
C18
C44
C13
C8
C9
C6
C7
C2
C405
C3
C5
Q1
C24
C39
C40
R39
R40
R29
1
11
R99
R10
CNS702
XL1
IC91
CNP1
CNP3
CNP2
CNP10
5
4
3
2
1
1
2
3
4
5
6
118
19
20253035
36
2
3
4
5
6
1
2
3
4
5
6
7
7
8
8
9
10
CNS303
11
10
9
8
7
6
5
4
3
2
1
CNS10CNS2
TO
CD MECHANISUM
P21 8-C-G
TO
TUNER PWB
P22 3-C
CNS3CNP303
TO
TUNER PWB
P22 1-G
CNP201
CNS1
E
CB
B
C
E
3
2
1
MAIN PWB-A1
51015
50/9
FM/AM(KHz)
100/10
R415
R417
C417
R413
C412
R414
R703
R412
C441
C443
R416
R418
C418
R73
C69
R75
C70
R76
R74
R97
R86
R88
R87
C53
R34
C32
R35
C31
R38
R60
C22
C57
151015 20 25 30
35
45
55
60
64
48
49
40
32
33
16 17
1510
15 20 25 30
35
45
55
60
64
48
49
40
32
33
16 17
R57 R56
R58
R45
R79
R46
R47
R72
R77R71
R70
C55
C56
C54
R78
C92
C51
R82
R16
R32
R33
C30
R37
R36
C33
R41
R95
C95
R27
R61 C20
R30
R24
R25
R23
R22
R21
C16 R19
C15
R20
C94
R31
C25
R17
C12
C14
R12
R15
R13
R11
R8
C10 R7
R9
R6
C4
R4
R5
R3
R2
C38
R1
R43
C1
R42
C456
IC401
IC5
2
R531
C535
R453
R432
R420
C444
C442
R539
R551
R555
R559
R941
R411
C411
151015 20 25 30
35
45
55
60
64
48
49
40
32
33
16 17
1
9
8
211 3 4 5 7
6 1210
78 9 10 11 12

CD-C290X
–20 –
A
B
C
D
E
F
G
H
123456
Figure 20 WIRING SIDE OF P.W.BOARD (4/6)
R
CNPM1
CNPM2
12
12
FWM1 FWM2
SWM3
SWM4
F. A. S
F. P.
123456789101112
3
4
2
1PHM1
1
7
1
2
3
4
5
6
7
RD
WH
BK
WH
BK
WH
BK
D903
D901
CNS901
TF901
PT901
POWER TRANSFORMER
S0901
AC POWER
INPUT SOCKET
AC 110/127/220/230-240V
50/60Hz
R904
R902
ZD902
C903
R905
C908
F901
T3.15A L 250V
F902
T1.6A L 250V
D904 D902
C907
C909
D908 D906
C905
C906
D910
C904
D905
D907
C910
R901 D911
D909
C902
Q901
ZD901
B
C
E
C901
R903 R907
CNSM1
TO MAIN PWB
P17 6-H
CNP901
TO
MAIN PWB
P18 3-C
MM1
TAPE MOTOR(203-7)
WH
BK
SOLM1
SOLENOID
(203-8)
+
-
SWM5
CAM
BK
WH
TAPE MECHANISM
PWB-D
POWER PWB-B
WH
PK BK
TAPE 1
PLAYBACK HEAD(203-6)
TAPE 2
ERASE HEAD(203-5) RECORD/PLAYBACK
HEAD(203-6)
YL
WHBL
PK
WH BK
GY
GYGY
BL
CNS502
CNS501
YL
WH
BK PK
WH
BK
7654321231
WH
BK PK
CNP502
TO MAIN PWB
P18 4-A
TO MAIN PWB
P18 5-A
CNP501
SW901
VOLTAGE
SELECTOR
110V
127V 220V
230-240V
TAPE MECHANISM ASSEMBLY