Sharp CD-PC672 User manual

– 1 –
CD-PC672
No. S4915CDPC672/
CONTENTS Page
IMPORTANT SERVICE NOTES (For U.S.A. Only) ........................................................................................................... 2
SPECIFICATIONS ..............................................................................................................................................................3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 7
QUICK GUIDE ................................................................................................................................................................... 8
DISASSEMBLY.................................................................................................................................................................. 9
REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 12
ADJUSTMENT ................................................................................................................................................................. 13
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 16
BLOCK DIAGRAM ........................................................................................................................................................... 17
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD..............................................................................................20
VOLTAGE ........................................................................................................................................................................ 40
WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 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-PC672
• 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-PC672 mini component system consisting of CD-PC672 (main
unit), CP-C672 (front speakers), CP-SW672 (sub woofer),
GBOXS0022AWM1 (center speaker) and GBOXS0023AWM1 (rear
speaker).
Manufactured under license from Dolby Laboratories Licens-
ing Corporation.
DOLBY, the double-D symbol and "PRO LOGIC" are
trademarks of Dolby Laboratories Licensing Corporation.

CD-PC672
– 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 of0.3 voltRMS (thiscorresponds to0.2 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-PC672
Front speaker section
Type: 2-way 5-1/4" (13 cm) woofer
and 2" (5 cm) tweeter type
Maximum input power: 80 W
Rated input power: 40 W
Impedance: 6 ohms
Dimensions: Width; 7-7/8" (200 mm)
Height; 11-13/16" (300 mm)
Depth; 9-7/16" (240 mm)
Weight: 6.3 lbs. (2.9 kg)/each
Center speaker section
Type: 4" (10 cm) full-range speaker
Maximum input power: 40 W
Rated input power: 20 W
Impedance: 4 ohms
Dimensions: Width; 10-1/4" (260 mm)
Height; 5-1/2" (140 mm)
Depth; 6-1/8" (155 mm)
Weight: 2.0 lbs. (0.9 kg)/each
Rear speaker section
Type: 4" (10 cm) full-range speaker
Maximum input power: 20 W
Rated input power: 10 W
Impedance: 8 ohms
Dimensions: Width; 6-3/4" (170 mm)
Height; 3-1/2" (88 mm)
Depth; 6-3/4" (170 mm)
Weight: 1.0 lbs. (0.5 kg)/each
Sub woofer section
Type: 5-1/4" (13 cm) full-range
speaker
Maximum input power: 80 W
Rated input power: 40 W
Impedance: 6 ohms
Dimensions: Width; 7-7/8" (200 mm)
Height; 11-13/16" (300 mm)
Depth; 11-5/8" (295 mm)
Weight: 7.5 lbs. (3.4 kg)/each
CP-C672
CP-SW672
GBOXS0022AWM1
General
Power source: AC 120 V, 60 Hz
Power consumption: Stand-by; 0.3 W
Power on; 150 W
Dimensions: Width; 10-5/8" (270 mm)
Height; 11-13/16" (300 mm)
Depth; 14-1/4" (362 mm)
Weight: 17.7 lbs. (8.1 kg)
Amplifier section
Output power: Front speakers; 40 W minimum
(Except for Canada) RMS into 6 ohms from 60 Hz to
20 kHz with no more than 10 %
total harmonic distortion.
Output power: Front speakers;
(For Canada) RMS; 80 W (40 W + 40 W)
(10 % T.H.D.)
Center speaker;
RMS; 20 W (10 % T.H.D.)
Rear speaker;
RMS; 20 W (total)
(10 % T.H.D.)
Sub woofer;
RMS; 40 W
(80 Hz 10 % T.H.D.)
Output terminals: Front speakers; 6 ohms
Center speaker; 4 ohms
Rear speaker; 8 ohms
Sub woofer; 6 ohms
Headphones; 16-50 ohms
(recommended; 32 ohms)
CD digital output (optical)
Input terminal: Video/Auxiliary (audio signal);
× 2; 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)
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) Specifications for this model are subject to change without
prior notice.
SPECIFICATIONS
CD-PC672
GBOXS0023AWM1

CD-PC672
– 4 –
NAMES OF PARTS
CD-PC672
■Front panel
11. Disc Number Selector Buttons
12. Disc Tray
13. Multi Indicator
14. Disc Skip Button
15. Open/Close Button
16. Extra Bass Indicator
17. FM Stereo Mode Indicator
18. FM Stereo Indicator
19. (CD) Repeat Indicator
10. (CD) Play Indicator
11. (CD) Pause Indicator
12. Spectrum Analyzer/Volume Level Indicator
13. (TAPE 2) Record Indicator
14. (CD) Disc Number Indicators
15. (CD/TUNER) Memory Indicator
16. Timer Play Indicator
17. Timer Record Indicator
18. Sleep Indicator
19. (TAPE 2) Record Pause Button
20. (CD) Track Down/Review Button
3(TUNER) Preset Down Button
3(TAPE 2) Rewind Button
21. (CD) Track Up/Cue Button
3(TUNER) Preset Up Button
3(TAPE 2) Fast Forward Button
22. Bypass Button
23. Normal Button
24. Timer Set Indicator
25. Timer/Sleep Button
26. Clock Button
27. Power Button
28. Headphone Socket
29. Equalizer Mode Selector Button
30. Dimmer Button
31. Phantom Button
32. Extra Bass/Demo Mode Button
33. Volume Control
34. Function Selector Buttons
35. Memory/Set Button
36. (CD/TAPE) Stop Button
37. (TAPE) Play Button
3(CD) Play/Repeat Button
38. Tuning and Time Up/Down Buttons
39. Sub Woofer Volume Control
40. (TAPE 1) Cassette Compartment
41. (TAPE 2) Cassette Compartment
134
25
6
7
8
9
10
11
12 13
16
17
14 15
18
19 20 21
35
22
25
27
29
26 30
37
31
32
33
34 36 38 39
23
24
28
41
40

– 5 –
CD-PC672
■Rear panel
11. CD Digital Output Socket
12. AC Power Lead
13. FM/AM Loop Aerial Socket
14. Video/Auxiliary (Audio Signal) Input Sockets
15. Rear Speaker Terminals
16. Centre Speaker Terminals
17. Front Speaker Terminals
18. Sub Woofer Terminals
■Front speakers
11. Tweeter
12. Woofer
13. Bass Reflex Duct
14. Speaker Wire
■Centre speaker
15. Full-Range Speaker
16. Speaker Wire
■Rear speaker
17. Full-Range Speaker
18. Speaker Wire
■Sub woofer
19. Woofer
10. Bass Reflex Duct
11. Speaker Wire
CP-C672
CP-SW672
GBOXS0022AWM1
3
2
1
4
5678
1
2
34
9
10
11
5
6
7
8
GBOXS0023AWM1

CD-PC672
– 6 –
CD-PC672
■Remote control
11. Remote Control Transmitter LED
12. Surround Level Buttons
13. Centre Level Buttons
14. Dolby Pro Logic Button
15. Centre Mode Button
16. Test Tone Button
17. Balance Control Buttons
●Tuner control section
18. Preset Up/Down Buttons
●CD control section
19. Memory Button
10. Pause Button
11. Stop Button
12. Play/Repeat Button
13. Clear Button
14. Track Down/Review Button
15. Random Button
16. Track Up/Cue Button
17. Disc Skip Button
●Tape control section
18. (TAPE 1) Play Button
19. (TAPE 1/2) Stop Button
20. (TAPE 2) Record Pause Button
21. (TAPE 2) Rewind Button
22. (TAPE 2) Play Button
23. (TAPE 2) Fast Forward Button
24. Equalizer Mode Button
25. Function Selector Buttons
26. Power Button
27. Extra Bass Button
28. Volume Up/Down Buttons
1
7
4
5
109
6
8
11 12
13
14
24
19
20 22 21
15
17
2
18 16
23
25
26
27
28
3

– 7 –
CD-PC672
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/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 (see page 18).
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 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.
CLOCK
POWER
MEMORY/ SET
TUNING/ TIME ( )
AM 12:00 AM 0:00 0:00
2 3
4
7
6 5
8 9
If this happens, follow the procedure below to change the clock time.
To change the clock time: ①
Press the CLOCK button.
②
Within 5 seconds, press the MEMORY/SET button.
③
Perform steps 6 - 9 above.
To see the time display:
Press the CLOCK button. ●The time display will appear for about 5 seconds. To change the time display mode: ①
Perform steps 1 - 2 in the section "RESETTING THE MICRO- COMPUTER", on page 18.
②
Perform steps 1 - 9 above.
(Main unit operation)
In this example, the clock is set for the 12-hour (AM 12:00) system.
RESETTING THE MICROCOMPUTER
Reset the microcomputer under the following conditions: ●To erase all of the stored memory contents (clock and timer
settings, and tuner and CD presets).
●If the display is not correct. ●If the operation is not correct. 1
Press the POWER button to enter the stand-by mode.
2
While pressing down the button and the button, 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

CD-PC672
– 8 –
MINI COMPONENT SYSTEM Quick Guide/Guía rápida
CD-PC672
●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
●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) Altavoz
trasero
(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
White line Línea blanca
Red Rojo
Center speaker Altavoz
central
■Turning the power on and off ■
Conexión y desconexión de la alimentación
■Remote control ■
Controlador remoto
POWER
POWER
15
15
Black Negro
Sub woofer Altavozde
subgraves
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
■Sub woofer volume ■
Volumen de subgraves

– 9 –
CD-PC672
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 orwireholders where theyneedto
beremovedwhendisassemblingtheunit.Afterservicing
theunit,besure to rearrangetheleads where theywere
before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
Figure 9-2
Figure 9-3
CD-PC672
1 Top Cabinet 1. Screw ..................... (A1) x4 9-1
2 Side Panel 1. Screw ..................... (B1) x8 9-1
(Left/right)
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
5. Screw ..................... (C4) x2
4 Back Board 1. Screw ..................... (D1) x6 9-2
(with Digital 2. Socket .................... (D2) x1
Output PWB)
5 Main PWB 1. Socket .................... (E1) x2 10-1
2. Flat Cable............... (E2) x1
3. Flat Wire................. (E3) x1
6 Power PWB 1. Screw ..................... (F1) x4 10-1
2. Socket .................... (F2) x4
3. Holder PWB ........... (F3) x5
7 Front Panel 1. Screw ..................... (G1) x2 10-1
8 Display PWB/ 1. Screw ..................... (H1) x13 10-2
Switch PWB 2. Support Bracket ..... (H2) x1
Headphones PWB
9 Tape Mechanism 1. Open the cassette holder. 10-2
2. Screw...................... (J1) x6
3. Socket .................... (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 R EMOVAL 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.Afterremoving theconnectorfor theopticalpickup fromthe
connector, wrap the conductive aluminium foil around the
front end of connector to protect the optical pickup from
electrostatic damage.
Figure 9-1
CD-PC672
LOCK
LEVER
Top Cabinet
(A1)x2
ø3x12mm
(A1)x2
ø3x12mm
Side Panel
(Left)
(B1)x2
ø3x8mm
(B1)x2
ø3x10mm
(B1)x4
ø3x10mm
Back Board
(D1)x4
ø3x10mm
(D2)x1
(D1)x2
ø3x10mm
Back Board
CD Tray Cover
Main PWB
CD Player
Unit
Hook
( C1) x3
(C2) x1
(C4) x1
ø3x10mm (C4) x1
(C3) x3
1
1
2
Pull
(C2) x1

CD-PC672
– 10 –
Figure 10-1
Figure 10-2
Figure 10-3
Be careful 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
Front Panel
Display PWB
(H2)x1
Switch PWB
Open
Cassette
Holder
Tape Mechanism
(H1)x2
ø3x10mm
(H1)x10
ø3x10mm
(H1)x1
ø3x10mm
(J1)x6
ø3x10mm (G1)x2
ø3x10mm
Headphones
PWB
(J2)x1
(F1)x3
ø3x10mm
(E1)x2
(F3)x5
(E2)x1
Front Panel
(F2)x2
(F2)x2
(F1)x1
ø3x10mm
Push Push
1 1
2Pull
POWER
PWB
Main PWB
POWER PWB
(E3)x1
Headphoens
PWB