Sharp CD-C492 User manual

– 1 –
CD-C492/492C
No.S5829CDC492//
CONTENTS Page
IMPORTANT SERVICE NOTES (For U.S.A. Only) ........................................................................................................... 2
SPECIFICATIONS ............................................................................................................................................................. 3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 8
QUICK GUIDE ................................................................................................................................................................... 9
DISASSEMBLY................................................................................................................................................................ 12
REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 15
ADJUSTMENT ................................................................................................................................................................. 16
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 19
WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 20
BLOCK DIAGRAM ........................................................................................................................................................... 21
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD............................................................................................. 26
TROUBLESHOOTING ..................................................................................................................................................... 55
FUNCTION TABLE OF IC................................................................................................................................................ 59
FL DISPLAY..................................................................................................................................................................... 70
REPLACEMENT PARTS LIST/EXPLODED VIEW
PACKING OF THE SET (For U.S.A. Only)
CD-C492
CD-C492C
• 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
Manufactured under license from Dolby Laboratories.
"Dolby", "Pro Logic" and the double-D symbol are trademarks
of Dolby Laboratories. Confidential Unpublished Works.
©1992-1997 Dolby Laboratories, Inc. All rights reserved.
●QSOUND and the QLogo are registered trademarks of
QSound Labs, Inc.
●QSound is protected under US Patent Nos. 5,105,462 and
5,208,860 and foreign counterparts.
CP-C492, CP-SW492, CENTER(GBOXS0010AWM1) and
SURROUND(GBOXS0011AWM1) speaker system
Constibute CD-C492/CD-C492C.

CD-C492/492C
– 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, 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
havingareturnpathtothechassis(antenna,metalcabinet,
screw heads, knobs and control shafts, escutcheon, etc.)
and measure the AC voltage drop across the resistor.
AllcheckmustberepeatedwiththeAClinecordplugconnection
reversed.
Anyreadingof0.3voltRMS(thiscorrespondsto0.2milliamp.
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
ACCESSORIES
Remote control × 1
(RRMCG0141AWSA) FM antenna × 1
(92LFANT1746A) AM loop antenna × 1
(QANTL0006AWZZ)
Front speaker wire × 2
(92L3191SW49210) Center speaker wire × 1
(92L3191SW49210) Sub woofer wire × 1
(92L3191SW49210) Surround speaker wire × 2 (92L291-0068)

– 3 –
CD-C492/492C
SPECIFICATIONS
General
Power source: AC 120 V, 60 Hz
Power consumption: 200 W
Dimensions: Width; 10-5/8" (270 mm)
Height; 12-1/2" (316 mm)
Depth; 13-1/2" (343 mm)
Weight: 23.2 lbs. (10.5 kg)
Amplifier section
Output power: Front speakers; 40 W minimum
RMS per channel into 8 ohms,
from 60 Hz to 20 kHz with no
more than 10 % total harmonic
distortion.
Center speaker; 40 W
(1 kHz, 10 % T.H.D.)
Surround speakers; 40 W per
channel
(1 kHz, 10 % T.H.D.)
Sub woofer; 40 W
(80 Hz, 10 % T.H.D.)
Output terminals: Front speakers; 8 ohms
Center speaker; 8 ohms
Surround speakers; 8 ohms
Sub woofer; 8 ohms
Monitor; 1 Vp-p/75 ohms
Headphones; 16 - 50 ohms
(recommended; 32 ohms)
Input terminals: DVD1 (Digital); Optical
DVD2 (Digital); Coaxial
VCR1/AUX1; 500 mV/47 kohms
VCR2/AUX2; 500 mV/47 kohms
DVD1/VCR1; 1 Vp-p/75 ohms
DVD2/VCR2; 1 Vp-p/75 ohms
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)
Compact disc player section
Type: 3-disc multi-play compact disc
player
Signal readout: Non-contact, 3-beam semi-con-
ductor laser pickup
D/A converter: 1-bit D/A converter
Frequency response: 20 - 20,000 Hz
Dynamic range: 100 dB (1 kHz)
Front speaker section
Type: 3-way, 5-1/8" (130 mm) woofer,
2" (50 mm) tweeter and super
tweeter
Maximum input power: 80 W
Impedance: 8 ohms
Dimensions: Width; 8-11/16" (220 mm)
Height; 12-1/2" (316 mm)
Depth; 11-3/16" (284 mm)
Weight: 7.5 lbs. (3.4 kg)/each
Center speaker section
Type: 2-way, 4-3/4" (120 mm) woofer
and 2" (50 mm) tweeter
Maximum input power: 80 W
Impedance: 8 ohms
Dimensions: Width; 10-5/8" (270 mm)
Height; 5-5/8" (142 mm)
Depth; 8-11/16" (220 mm)
Weight: 4.0 lbs. (1.8 kg)
Surround speaker section
Type: 2-way, 4" (100 mm) woofer and
2" (50 mm) tweeter
Maximum input power: 80 W
Impedance: 8 ohms
Dimensions: Width; 7-7/8" (200 mm)
Height; 5-5/16" (134 mm)
Depth; 9-1/2" (240 mm)
Weight: 3.1 lbs. (1.4 kg)/each
Sub woofer section
Type: 6-1/2" (160 mm) woofer
Maximum input power: 80 W
Impedance: 8 ohms
Dimensions: Width; 8-11/16" (220 mm)
Height; 12-1/2" (316 mm)
Depth; 11-5/8" (294 mm)
Weight: 8.4 lbs. (3.8 kg)
CP-C492
GBOXS0010AWM1
CD-C492/492C
GBOXS0011AWM1
Specifications for this model are subject to change without prior notice.
CP-SW492

CD-C492/492C
– 4 –
Front panel
1. Disc Tray
2. Disc Number Selector Buttons
3. Disc Skip Button
4. Open/Close Button:
5. LFE Indicator
6. Left Surround Speaker Indicator
7. Left Front Speaker Indicator
8. Centre Speaker Indicator
9. Sub Woofer Indicator
10. Right Front Speaker Indicator
11. Dolby Pro Logic Indicator
12. Dolby Virtual Indicator
13. (CD) Disc Number Indicator
14. (TAPE) Direction Indicator
15. (TAPE) Reverse Mode Indicator
16. Surround Signal Indicator
17. Right Surround Speaker Indicator
18. Dolby Digital Indicator
19. (CD) Play Indicator
20. (CD) Repeat Play Indicator
21. (CD) Pause Indicator
22. (TAPE) Record Indicator
23. Timer Record Indicator
24. Timer Play Indicator
25. Sleep Indicator
26. Extra Bass Indicator: X-BASS
27. (CD) Random Play Indicator
28. (CD/TUNER) Memory Indicator
29. (TUNER) FM Stereo Indicator:
30. (TUNER) FM Stereo Mode Indicator: ST
31. Spectrum Analyzer Indicator
32. Function Selector Buttons
33. Extra Bass Button
34. Volume Control
35. Power Button
36. Headphone Socket
37. Surround Mode Selector Buttons
38. Equalizer Selector/Demo Mode Button
NAMES OF PARTS
CD-C492/492C
1234
5
6
7
8
9
10 11 12 13 1415
16 1718 19 20 21 22
23 2425 26
27
28
29 30 31
32 33 34
35 36 37 38

– 5 –
CD-C492/492C
39. Clock Button
40. Sleep Button
41. Reverse Mode Button: ( )
42. CD Pause Button:
43. Jog Dial
44. (CD/TAPE) Stop Button:
45. Record Pause Button:
46. Menu Button
47. Item Button
48. Timer Button
49. Memory Button
50. Clear Button
51. (CD) Track Down/Review Button: /
(TAPE 2) Fast Wind Button:
(TUNER) Tuning Down Button:
52. (TAPE 2) Reverse Play Button:
53. (CD) Play/Repeat Button: /
(TAPE 1) Play button:
(TAPE 2) Forward Play Button:
54. (CD) Track Up/Cue Button: /
(TAPE) Fast Wind Button:
(TUNER) Tuning Up Button:
55. (TAPE) Normal Edit Button
56. (TAPE) High Edit Button
57. (TAPE 1) Cassette Compartment
58. (TAPE 2) Cassette Compartment
57 58
39 40 41 42 43 44 45 46 47
48 49 50 51 52 53 54 55 56

CD-C492/492C
– 6 –
RATED SPEAKER IMPEDANCE : 8 OHMS MIN.
IMPEDANCE NOMINALE DU HAUT-PARLEUR :
RATED SPEAKER IMPEDANCE : 8 OHMS MIN.
IMPEDANCE NOMINALE DU
HAUT-PARLEUR : 8 OHMS MINIMUM
8 OHMS MINIMUM
1234
5
67 8
9
10
11
12
13 14 15 16
Rear panel
1. DVD 1 Digital Input Socket (Optical)
2. DVD 2 Digital Input Socket (Coaxial)
3. DVD 1/VCR 1 Video Input Socket
4. DVD 2/VCR 2 Video Input Socket
5. Video Output Socket
6. CD Digital Output Socket (Optical)
7. VCR 1/AUX 1 Input Socket
8. VCR 2/AUX 2 Input Socket
9. FM 75 ohms Aerial Terminal
10. Aerial Earth Terminal
11. AM Aerial Terminal
12. AC Power Lead
13. Front Speaker Terminals
14. Centre Speaker Terminals
15. Surround Speaker Terminals
16. Sub Woofer Terminals
CP-C492
1
2
3
4
5
Front speakers
1. Super Tweeter
2. Tweeter
3. Woofer
4. Bass Reflex Duct
5. Speaker Terminals
CP-SW492
1
2
3
Sub woofer
1. Woofer
2. Bass Reflex Duct
3. Speaker Terminals

– 7 –
CD-C492/492C
1
23
Centre speaker
1. Tweeter
2. Woofer
3. Speaker Terminals
2
1
3
456
7
8
9
10
11
12
13
14
15 16
17 18 19 20
21
22
23
24
25 26
27
GBOXS0010AWM1
Remote control
1. Remote Control Transmiter LED
2. Surround Mode Selector Buttons
3. Sub Woofer Level Control Buttons: /
4. Setup Up/Down Buttons: /
5. Menu Button
6. Item Button
Tuner control section
7. Preset Up/Down Buttons: /
CD control section
8. Track Up/Cue Button: /
9. Track Down/Review Button: /
10. Memory Button
11. Disc Skip Button
12. Stop Button:
13. Play/Repeat Button:
14. Pause Button:
15. Clear Button
16. Random Button
Tape control section
17. (TAPE 2) Record Pause Button:
18. (TAPE 2) Reverse Play Button:
19. Stop Button:
20. (TAPE 1) Play Button:
(TAPE 2) Forward Play Button:
21. (TAPE 2) Fast Wind Buttons: /
Common section
22. Extra Bass Button
23. Equalizer Mode Button
24. Function Selector Buttons
25. Power Button
26. Volume Control Buttons
27. Dimmer Button
Surround speakers
1. Tweeter
2. Woofer
3. Speaker Terminals
GBOXS0011AWM1
1
2
3

CD-C492/492C
– 8 –
OPERATION MANUAL
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 button.
4
Turn the jog dial to select the time display mode.
"0:00" →The 24-hour display will appear.
(0:00 - 23:59)
"AM 12:00"→The 12-hour display will appear.
(AM or PM 12:00 - 11:59)
"AM 0:00" →The 12-hour display will appear.
(AM or PM 0:00 - 11:59)
●Note that this can only be set when the unit is first installed
or it has been reset (see page 37).
5
Press the MEMORY button.
6
Adjust the hour by turning the jog dial.
●When the jog dial is turned one click clockwise, the time will
increase by 1 hour. When it is turned one click counterclock- wise, the time will decrease by 1 hour. Keep turning the jog dial to change the time continuously.
●When the 12-hour display is selected, "AM" will change auto-
matically to "PM".
7
Press the MEMORY button.
8
Adjust the minutes by turning the jog dial.
●When the jog dial is turned one click clockwise, the time will
increase by 1 minute. When it is turned one click counterclock- wise, the time will decrease by 1 minute. Keep turning the jog dial to change the time continuously.
●The hour setting will not advance even if minutes advance from
"59" to "00".
9
Press the MEMORY 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 cord 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 cord was disconnected. If 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: ➀ Press the MEMORY button. ➁ Perform steps 6 - 9 above. When the unit is on: ➀ Press the CLOCK button. ➁ Within 5 seconds, press the MEMORY button. ➂ 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:
➀ Perform steps 1 and 2 in the section "RESETTING THE MI-
CROCOMPUTER", on page 37.
➁ Perform steps 1 - 9 above.
POWER CLOCK
Jog dial
MEMORY TUNING
( )
In this example, the clock is set for the 12-hour (AM 12:00) system.
0:00 AM 12:00 AM 0:00
2 3
4
5 6
7 8
9
RESETTING THE MICROCOMPUTER
POWER
EQUALIZER /DENO
Reset the microcomputer by performing the following procedure for the cases shown below: ●To erase all of the stored memory contents, or ●If the display does not function properly, or ●The unit does not operate properly.
1
Press the POWER button to turn the power off.
2
Press the POWER button while holding down the button and the EQUALIZER/DEMO button.
WHEN "PROTECT" APPEARS
Caution: ●The operation explained above will erase all data stored
in memory including clock and timer settings, and tuner and CD presets.

– 9 –
CD-C492/492C
MINI COMPONENT SYSTEM Quick Guide/Guía rápida
CD-C492
Remote control x 1 Controlador remoto x 1
2 “AA” batteries Dos pilas “AA”
Remote sensor
Sensor remoto
3
Placing the speaker system /
Situación de los altavoces
2
How to use the remote control /
Empleo del controlador remoto
1
Check the supplied accessores /
Compruebe los accesorios suministrados
FM antenna x 1 Antena de FM x 1
AM loop antenna x 1 Antena de cuadro de AM x 1
Front speaker wire x 2 Cable de altavoz frontal
x 2
Center speaker wire x 1
Cable de altavoz
central x 1
Sub woofer wire x 1 Cable de altavoz de
subgraves x 1
Surround speaker wire x 2 Cable de altavoz de
sonido perimétrico x 2
Batteries are not included. Las pilas no están incluidas.
Surround speaker Altavoz de sonido perimétrico
Wall Pared
23-5/8” - 35-7/16” (60 - 90 cm) 60 - 90 cm
+-
-
+
15
15
8” - 20’ (0.2m - 6m) 0,2m - 6m
4
Connecting the system /
Conexión del sistema
AC 120 V, 60 Hz
120 V de CA, 60 Hz
TV TV
Video
Video Audio (Optical) Audio
R R L
L
Video Audio (Coaxial) Audio (Analog)
DVD
DVD
VCR VCR
How to switch between an audio signal and a video signal Cómo cambiar entre una señal de audio y una
señal de vídeo
BUTTON/
BOTÓN
“DVD 1”
AUDIO OUTPUT/
SALIDA DE AUDIO
VIDEO OUTPUT/
SALIDA DE V?DEO
DISPLAY/
VISUALIZACIÓN
“VCR 1” “DVD 2” “VCR 2”
DVD 1 VCR 1/AUX 1 DVD 2 VCR 2/AUX 2
DVD 1/VCR 1 DVD 1/VCR 1 DVD 2/VCR 2 DVD 2/VCR 2
DVD 1
VCR 1
DVD 2
VCR 2

CD-C492/492C
– 10 –
Red Rojo
123
AM Loop Antenna Antena de cuadro de AM
FM Antenna Antena de FM
SUB WOOFER ALTAVOZ DE
SUBGRAVES
Red Rojo
Black Negro
RIGHT DERECHO
LEFT IZQUIERDO
RIGHT DERECHO
LEFT
IZQUIERDO
Red Rojo
Black Negro
Red Rojo
Black Negro
CENTER SPEAKER ALTAVOZ
CENTRAL
FRONT SPEAKER
ALTAVOZ FRONTAL
SURROUND SPEAKER ALTAVOZ DE SONIDO
PERIMÉTRICO
Red Rojo
Black
Negro
Red Rojo
Black Negro
Red Rojo
Black Negro
Black Negro
With a white line Con la línea blanca
With a white line Con la línea blanca
With a white line Con la línea blanca
5
Listening to a CD /
Audición de discos CD
Press the POWER button to turn the power on.
Pulse el botón POWER para
conectar la alimentación.
1
Press the CD button. Pulse el botón CD.
Press the OPEN/CLOSE button to open the disc tray and place the CD (s)
on the disc tray, label side up.
Pulse el botón OPEN/CLOSE para abrir la
bandeja del disco y coloque el disco(s) CD en la
bandeja del disco con el lado de la etiqueta arriba.
2
3
Press the OPEN/CLOSE button to close the disc tray. Pulse el botón OPEN/CLOSE
para cerrar la bandeja del disco.
4
Press the button. Pulse el botón .
5
Adjust the volume level. Turn the VOLUME control clockwise to increase the volume. Turn the VOLUME control counterclockwise to decrease the volume.
Ajuste el nivel de volumen.
Girando el control VOLUME hacia
la derecha se incrementa el
volumen.
Girando el control VOLUME hacia
la izquierda se reduce el volumen.
6
To stop the playback
Para detener la reproducción
Press the button. Pulse el botón .
VOLUME

– 11 –
CD-C492/492C
6
Listening to a tape /
Audición de una cinta
7
Listening to the radio /
Audición de la radio
Load a cassette into the cassette compartment. Inserte un casete en el
compartimiento del casete.
3
Press the POWER button to turn the power on. Pulse el botón POWER para
conectar la alimentación.
1
Press the TAPE button to select "TAPE 1" or "TAPE 2". Pulse el botón TAPE para
seleccionar "TAPE 1" o "TAPE 2".
2
TAPE 2
TAPE 1
Press the button. Pulse el botón .
4
To stop the playback Para detener la reproducción
Press the button. Pulse el botón .
Press the TUNING ( / ) button to tune in to the desired station.
Pulse el botón TUNING ( / )
para sintonizar la emisora
deseada.
3
Press the POWER button to turn the power on. Pulse el botón POWER para
conectar la alimentación.
1Press the TUNER (BAND) button
to select "FM ST" ,"FM"or "AM". Pulse el botón TUNER (BAND) para
seleccionar "FM ST", "FM", o "AM".
2
8
Recording from CDs /
Grabaciones de discos CD
Press the POWER button to turn the power on. Pulse el botón POWER para
conectar la alimentación.
1Press the TAPE (1 2) button to
select the "TAPE 2". Pulse el botón TAPE (1 2) para
seleccionar "TAPE 2".
2
3
Press the REVERSE MODE button to select the reverse mode. Pulse el botón REVERSE MODE
para seleccionar el modo de
inversión.
4
Press the CD button and load the desired disc.
Pulse el botón CD y coloque el
disco deseado.
5
Press the NORMAL EDIT button.
Pulse el botón NORMAL EDIT.
6
••••• One side /
Una cara
••••• Both side /
Ambas caras
TAPE 2
Load a cassette into the TAPE2 cassette compartment. Inserte un casete en el
compartimiento del
casete de TAPE 2.
To stop the recording
Para detener la grabación
Press the button. Pulse el botón .

CD-C492/492C
– 12 –
1 Top Cabinet 1. Screw ..................... (A1) x4 12-1
2 Side Panel 1. Screw ..................... (B1) x4 12-1
(Left/right)
3 CD Player Unit/ 1. Turn on the power supply, 12-2
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. Screw ..................... (C3) x1
5. Socket .................... (C4) x3
4 Dolby PWB 1. Flat cable ............... (D1) x2 13-1
2. Socke ..................... (D2) x1
3. Screw ..................... (D3) x10
5 Tuner PWB 1. Socket .................... (E1) x1 13-1
2. Screw ..................... (E2) x5
6 Rear Panel 1. Screw ..................... (F1) x10 12-2
7 Main PWB 1. Flat cable ............... (G1) x2 13-2
2. Flat wire ................. (G2) x1
3. Socket...................... (G3) x4
4. Screw....................... (G4) x3
8 Front Panel 1. Flat wire ................. (H1) x2 13-2
2. Screw...................... (H2) x2
9 Heat Shink Cover 1. Screw ..................... (J1) x4 13-2
10 Power Amp. PWB 1. Socket .................... (K1) x3 13-3
2. Screw ..................... (K2) x6
11 Power Supply PWB 1. Screw ..................... (L1) x6 13-4
12 Display PWB 1. Knob....................... (M1) x2 13-4
2. Nut.......................... (M2) x2
3. Screw ..................... (M3)x12
13 CD Switch PWB 1. Screw ..................... (N1) x3 13-4
14 Headphones 1. Screw ..................... (P1) x1 13-4
15 Tape Mechanism 1. Screw ..................... (Q1) x6 13-4
16 Turntable 1. Screw ..................... (R1) x1 13-5
2. Cover ..................... (R2) x1
17 Disc Tlay 1. Screw ..................... (S1) x2 13-5
2. Guide ..................... (S2) x2
18 CD Player Unit/ 1. Screw ..................... (T1) x1 13-5
CD Servo PWB 2. Socket .................... (T2) x4
19 CD Changer 1. Screw ..................... (U1) x4 14-1
Mechanism
20 CD Mechanism 1. Screw ..................... (V1) x1 14-1
DISASSEMBLY
Caution on Disassembly
Follow the below-mentioned notes when disassembling
the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Take cassette tape and compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit.
3.Take offnylon bands orwire holderswhere they need to
beremovedwhendisassemblingtheunit.Afterservicing
theunit, besure to rearrangethe leadswhere they were
before disassembling.
4. Take suffcient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 12-2
Figure 12-3
CD-C492/492C
STEP REMOVAL PROCEDURE FIGURE
Note 1:
How to open the changer manually. (Fig. 12-3)
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.
Figure 12-1
CD-C492/492C
( B1 ) x2
ø3 x8mm
( B1 ) x4
ø3 x8mm ( B1 ) x2
ø3 x8mm
Top Cabinet
Side Panel
(Right)
Rear Panel
Side Panel
(Left)
( A1 ) x2
ø3 x12mm
( A1 ) x2
ø3 x12mm
LOCK
LEVER
< A >
CD Tray Cover
CD Player
Unit
( F1 ) x10
ø3 x8mm
( C3 ) x1
ø3 x8mm
Hook
( C1) x3
( C2 ) x1
( D2 )
x1
( C4 ) x3
Rear Panel
Main PWB
Front Panel
1
1
2
A
Tuner PWB
Pull
(C2) x1

– 13 –
CD-C492/492C
Figure 13-1
Figure 13-2
Figure 13-3
Figure 13-4
Figure 13-5
Figure 13-6
(E2) x4
ø3 x10mm
(D3) x4
ø3x10mm
(G4) x1
ø3 x10mm
(D3) x6
ø3x10mm
(E2) x1
ø3x10mm
(G4) x2
ø3x10mm
(G3) x2
(G1) x2
(D1) x1 (G2) x1
(G3) x2
(E1) x1
Rear Panel

Main PWB
Tuner PWB
Dolby PWB
Front Panel
(D2) x1
(D1) x1
(J2)x4
ø3x10mm
(K2)x5
ø3x10mm (H1)x1
Front Panel
( K2 ) x1
ø3x10mm ( H2 ) x1 ø3x10mm
( K1 ) x2
( K1 ) x1
( H1 ) x1
Heat Shink Cover Power Amp. PWB
(L1)x4
ø4x8mm
(L1)x1
ø3x10mm
(L1)x1
ø3x10mm
Power Supply PWB
(N1)x3
ø3x10mm
(M3)x12
ø3x10mm
(Q1)x6
ø3x10mm Lug Wire
(P1)x1
ø3x10mm
Open
Headphones
PWB
Display
PWB
(M1)x2
(M2)x1
(M2)x1
Washer
Tape Mechanism
Cassette
Holder (Left/Right)
Front Panel
CD Switch PWB
( S1 ) x1
ø3 x10mm
( S1 ) x1
ø3 x10mm
( R1 ) x1
ø3 x10mm
Turntable
Disc Tray
( R2 ) x1
( S2 ) x1
( S2 ) x1
CD Player Unit
( T1 ) x1
ø3 x10mm
( T2 ) x2
( T2 ) x2 CD Player Unit
CD Servo PWB

CD-C492/492C
– 14 –
CP-C492
1 Front Speaker 1. Net.......................... (A1) x1 14-2
2. Baffle Board ........... (A2) x1
3. Screw ..................... (A3) x2
4. Screw ..................... (A4) x4
5. Screw ..................... (A5) x2
STEP REMOVAL PROCEDURE FIGURE
CP-C492
Figure 14-2
CP-SW492
Figure 14-3
CP-SW492
1 Sub woofer 1. Net.......................... (A1) x1 14-3
2. Duct Panel ............. (A2) x1
3. Screw ..................... (A3) x4
STEP REMOVAL PROCEDURE FIGURE
Note:
The center and rear speakers can be easily disassembled.
Therefore the disassembling method is not discribed.
For details refer to the disassembling drawing in the Parts
Guide.
Be careful when installing the CD changer mechanism.
InstalltheCDchangermechanismontheCDplayerbaseafter
the shift lever has been set in the highest position.
Figure 14-1
Screw driver
Woofer
Woofer
Net
(A1)x1
Baffle Board
(A2)x1
Tweeter
Tweeter
Super
Tweeter (A5)x2
ø3x10mm
(A3)x2
ø3x10mm
(A4)x4
ø4x16mm
( A3 ) x4
ø4 x16mm
Net
( A1 ) x1
( A2 ) x1 Screwdriver
Woofer
( U1 ) x4
ø3 x12mm
( V1 ) x1
ø2.6 x10mm
CD Changer
Mechanism
CD Mechanism
Shift Lever
CD Player Base

– 15 –
CD-C492/492C
How to remove the pickup (See Fig. 15-2)
1.Remove thescrews (B1)x 2pcs., toremove theshaft (B2).
2. Remove the stop washer (B3) x 1 pc., to remove the gear
(B4).
3. Remove the pickup.
Figure 15-2
REMOVING AND REINSTALLING THE MAIN PARTS
CD MECHANISM SECTION
Perform steps 1, 2, 3, 18 and 20 of the disassembly method
to remove the CD mechanism.
How to remove the loading motor
(See Fig. 15-1)
1. Remove the screws (A1) x 2 pcs., to remove the loading
motor.
Figure 15-1
( 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

CD-C492/492C
– 16 –
TUNER PWB
IC302
AM IF
T351
TP301
T352
VR351
VCO
FM BAND
COVERAGE fL
L303 T301
FM IF
T304 T302
L302
IC301
SO301
ANTENNA
TERMINAL
AM
GND
FM 75 ohms
FM RF
FM
DETECTION
AM BAND
COVERAGE fL AM
TRACKING fL
Q342
B C E
20
IC303
21
13
1
TP302
1
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 100 g.cm
Fast forward: TW-2231 — 50 to 100 g.cm
Rewind: TW-2231 — 50 to 100 g.cm
Specified
Value
Adjusting
Point Instrument
Connection
Test Tape
Normal MTT-111 VRM1 3,000 ± Speaker
speed 30 Hz terminal
(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): T302 *2
Coverage 1.1 ± 0.1 V
Tracking 990 kHz 990 kHz (fL): T302 *1
Test Stage Frequency Frequency
Display Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna, Output: TP302
*2. Input: Antenna, Output: TP301
•FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Band — 87.50 MHz L303(fL): *1
Coverage 3.7 V ± 0.1 V
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
T301 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 16-2, 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.
Pin 13 of IC303 Pin 21 of IC303
D
G
S
10 kΩ
TO FREQUENCY
COUNTER
FET : 2SK19 or 2SK54
Figure 16-2
98.00 MHz 98.00 MHz VR351* Pin 13, Pin 21
(60 dB) and ground
of IC303
Figure 16-3 ADJUSTMENT POINTS
Figure 16-1
VRM1
TAPE
SPEED
FAS
SW
SWM1
TAPE MECHANISM PWB

– 17 –
CD-C492/492C
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 17-2 Figure 17-3
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. 17-2)
2. Tracking offset (Fig. 17-3)
3. E/F balance (tracking error balance) (Fig. 17-4)
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 17-1
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.
<CD> + <EQ> + <POWER> TEST: CD operation test
• TEST mode
Function — CD test mode
Setting of TEST mode
Indication of CD TST mode (Fig. 17-1)
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
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 17-4
IL is not performed.
<STOP>

CD-C492/492C
– 18 –
EXPLANATION OF DOLBY DIGITAL
DVD 1
/VCR 1 DVD 2 /VCR 2
DVD 1
/VCR 1 DVD 2 /VCR 2
When you connect this unit to a DVD player which is playing
a disc with the trademark, you can enjoy
realistic, powerful sound by playing back the recorded signal
through 6 speakers with the sound coming from the front
left, front right, center, surround left, surround right and sub
woofer speakers.
To listen to a disc using the Dolby Digital mode:
1 Connect a DVD player.
2 Press the DVD 1/VCR 1 or DVD 2/VCR 2 button to select
"DVD 1" or "DVD 2".
3 Start the DVD player.
Note:
●When the Dolby Digital surround mode is being used, the
equalizer will be set to FLAT.
Type of Dolby digital signal
There are different types of Dolby digital signals. The type of Dolby digital signal being input into this unit can be checked
in the display.
Display Channels available Display Channels available
Normal PCM playback Front (L, R) + surround
(L, R)
Center only (monaural) Front (L, R) + center
Front (L, R)
(When the surround mode
is set to Normal or
Phantom, sound will also be
heard from the surround
speakers.)
Front (L, R) + center +
surround (monaural)
Front (L, R) + surround
(monaural) Front (L, R) + center + surround (L, R)
●If a low frequency sound effect (Low Frequency Effect) contains a Dolby digital signal, "LFE" will light in the display.
When this "LFE" is lit, low frequency signals will be output from the sub woofer.
DOLBY DIGITAL
SURROUND EFFECT CONTROL
This product allows you to enjoy 4 surround modes.
Normal mode:
When you play a sound source that has the
(5.1 channels) or trademarks, you can enjoy
surround sound using all 6 speakers.
Phantom mode:
When you play a sound source that has the
or trademarks, you can enjoy surround sound
using 5 speakers, but not the center speaker.
Virtual Dolby Surround:
You can enjoy a three-dimensional surround stereo image
using just the 2 front speakers.
Enhanced Virtual Surround:
You can enjoy surround sound, using only the 2 front
speakers, but this mode increases the three-dimensional
stereo image effect even more.

– 19 –
CD-C492/492C
SW1 OPEN/CLOSE ON—OFF
SW2 MECHA UP ON—OFF
SW3 DISC NUMBER ON—OFF
SW4 PICKUP IN ON—OFF
SWD1 VOLUME ON—OFF
SWD2 JOG ON—OFF
SWD3 X-BASS ON—OFF
SWD4 PRE EQ ON—OFF
SWD5 MENU ON—OFF
SWD6 ITEM ON—OFF
SWD12 TUNING UP/CUE ON—OFF
SWD13 STOP ON—OFF
SWD14 NORMAL EDIT ON—OFF
SWD15 REC. PAUSE ON—OFF
SWD16 REC/PAUSE ON—OFF
SWD17 F-PLAY ON—OFF
SWD23 QSOUND ON—OFF
SWD26 VIRTUAL ON—OFF
SWD27 PHANTOM ON—OFF
SWD28 NORMAL ON—OFF
SWD29 BYPASS ON—OFF
SWD30 TUNING DOWN/REWIND ON—OFF
SWD31 CD PAUSE ON—OFF
SWD32 REVERSE MODE ON—OFF
SWD33 R-PLAY ON—OFF
SWD34 CLOCK ON—OFF
SWD35 MEMORY ON—OFF
SWD36 TIMER ON—OFF
SWD37 SLEEP ON—OFF
SWD38 CLEAR ON—OFF
SWD39 DVD/VIDEO 1 ON—OFF
SWD40 DVD/VIDEO 2 ON—OFF
SWD41 TAPE 1/2 ON—OFF
SWD42 TUNER/BAND ON—OFF
SWD43 CD ON—OFF
SWD48 POWER ON—OFF
SWD50 DISC 1 ON—OFF
SWD51 DISC 2 ON—OFF
SWD52 DISC 3 ON—OFF
SWD53 DISC SKIP ON—OFF
SWD54 OPEN/CLOS ON—OFF
SWM3 REC FWD ON—OFF
SWM4 REC RVS ON—OFF
SWM5 F.A.S ON—OFF
SWM6 CAM 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
< > 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 POSITIONREF. NO DESCRIPTION
Figure 19 TYPES OF TRANSISTOR
KTA1266 GR
KTA1270Y
KTA1271 Y
KTA1273 Y
KTC3199 GR
KTC3203 Y
KRA102 M
KRA107 M
KRA109 M
KRC102 M
KRC104 M
KRC107 M
2SC535 C
2SD468 C
2SC2878 A
2SD2012
2SB 1375
SLR325 MG
SLR325 VR
KL052 UL
SLR505 MC
LMKD515 B
KV1236Z23
(S)(G) (D)
(1) (2) (3)
E C B
FRONT
VIEW
FRONT
VIEW
B C E
(D)(G)(S)
(3) (2) (1)
FRONT
VIEW
FRONT VIEW

CD-C492/492C
– 20 –
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