Sharp SD-CX1H(BL) User manual

SD-CX1H
CONTENTS Page
SAFETY PRECAUTION OF MD SECTION FOR SERVICE MANUAL..............................................................................2
SAFETY PRECAUTION OF CD SECTION FOR SERVICE MANUAL ..............................................................................3
IMPORTANT SERVICE NOTES (FOR U.K. ONLY) .......................................................................................................... 3
SPECIFICATIONS ............................................................................................................................................................. 4
NAMES OF PARTS ........................................................................................................................................................... 5
OPERATION MANUAL ...................................................................................................................................................... 7
DISASSEMBLY................................................................................................................................................................ 12
REMOVING AND REINSTALLING THE MAIN PARTS................................................................................................... 15
DESCRIPTION OF CIRCUIT FOR 1-BIT AMP. UNIT ..................................................................................................... 17
TO CHECK AND CANCEL PROTECT CIRCUIT DETECTION LINE.............................................................................. 18
TEST MODE .................................................................................................................................................................... 19
ADJUSTMENT ................................................................................................................................................................. 24
ERROR MESSAGE LIST................................................................................................................................................. 33
EEPROM WRITING PROCEDURE ................................................................................................................................. 34
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 37
TYPES OF TRANSISTOR AND LED............................................................................................................................... 37
BLOCK DIAGRAM ........................................................................................................................................................... 38
SCHEMATIC DIAGRAM .................................................................................................................................................. 42
WIRING SIDE OF P.W.BOARD....................................................................................................................................... 56
WAVEFORMS OF 1 BIT AMP. CIRCUIT......................................................................................................................... 69
WAVEFORMS OF MD CIRCUIT ..................................................................................................................................... 70
WAVEFORMS OF CD CIRCUIT...................................................................................................................................... 72
TROUBLESHOOTING ..................................................................................................................................................... 74
FUNCTION TABLE OF IC................................................................................................................................................ 83
FL DISPLAY....................................................................................................................................................................101
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (FOR U.K. ONLY)
SERVICE MANUAL
SHARP CORPORATION
No. S2112SDCX1H//
• In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
SD-CX1H(BL)
SD-CX1H(GR)
SD-CX1H 1-Bit Digital Audio System consisting of SD-CX1H (main
unit) and CP-CX1H (speaker system).
MODEL
1-BIT DIGITAL AUDIO SYSTEM

SD-CX1H
– 2 –
SAFETY PRECAUTION OF MD SECTION FOR SERVICE MANUAL
The AEL (Accessible Emisson Level) of the laser power output is less than class 1 but the laser component is capable of emitting radiation
exceeding the limit for Class 1. Therefore it is important that the following precautions are observer during servicing to protect your eyes
against exposure to the laser beam.
1)Whentheunit casecoverisremoved andLOADINGSW(SW 1956)isturnedon andthenPLAYSW (SW1954mechanismPWB) isturned
on in a few second.
The laser will light for several second to detect a disk.
2) The laser power output of the pickup unit and replacement service parts are all factory pre-set before shipment.
Do not attempt to re-adjust the laser pickup unit during replacement or servicing.
3) Under no circumstances stare into the pickup lens at any time.
4) If laser optical unit becomes faulty, replace the complete laser optical unit.
5) CAUTION-Use of controls or adjustments, or performance of procedures other than those specified herein may result in hazardous
radiation exposure.
VARO ! Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen.
VARNING! Osynlig laserstralning när denna del är öppnad och spärren är urkopplad. Betrakta ej strälen.
Precaution to be taken when replacing and servicing the laser pickup.
The following precautions must be observed during servicing to protect your eyesvagainst exposure to the laser.
Warning of possible eye damage when repairing:
IftheACpowerplugisconnectedwhentheinnercoveroftheunitisremoved,thelaserwilllightupduringfocus access(about
1 second) (Fig. 2-1).
During this operation, the laser will leak from the opening between the magnetic head and cartridge holder (Fig. 2-2).
In order to protect your eyes, you must not look at the laser during repair.
Before repairing, be sure to disconnect the AC power plug.
Figure 2-1 Figure 2-2
Magnetic Head Optical Pickup
,,

Magnetic Head
Optical PickupSpindle Motor
Laser Beam
Cartridge Holder
Mechanism
Chassis
WARNINGS
Laser Diode Properties
●Material: GaAlAs
●Wavelength: 785 nm
●Pulse time:
Read mode: 0.8 mW Continuous
Write mode: max 10 mW 0.5S
min cycle 1.5S
Repetition
VAROITUS! LAITTEEN KÄYTTÄMINEN MUULLA KUIN TÄSSÄ KÄYTTÖOHJEESSAMAI
NITULLA TAVALLA SAATTAA ALTISTAA KÄYTTÄJÄN TURVALLISUUSLUOKAN 1
YLITTÄVÄLLE NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE.
VARNING - OM APPARATEN ANVÄNDS PÅANNAT SÄTT ÄN I DENNA BRUKSANVISNI
NGSPECIFICERAS.KANANVÄNDARENUTSÄTTASFÖROSYNLIG LASERSTRÅLNING,
SOM ÖVERSKRIDER GRÄNSEN FÖR LASERKLASS 1.
CAUTION -INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED
AVOID EXPOSURE TO BEAM .
VARNING - OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRRAR
ÄR URKOPPLADE. STRÅLEN ÄR FARLIG.
ADVARSEL - USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG SIKKERHEDSLÅS
BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN.
VARO! AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA
NÄKYMÄTÖN LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEN.
VARNING - OSYNLIG LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRREN
ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN.
ADVARSEL - USYNLIG LASERSTRÅLING VED ÅBNING NÅR SIKKERHEDSAFBRYDERE
ER UDE AF FUNKTION. UNDGÅ UDSETTELSE FOR STRÅLING.

– 3 –
SD-CX1H
Precaution to be taken when replacing and servicing the Laser Pickup.
TheAEL(AccessibleEmissionLevel)ofLaserPowerOutputforthismodelisspecifiedtobelowerthanClass1Requirements.
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 outer
than the lead-in position, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens.
(2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior 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 of controls or adjustments, or performance of procedures other than those specified herein may result in
hazardous radiation exposure.
(For U.K.) (Except for U.K.)
WARNINGS
SAFETY PRECAUTION OF CD SECTION FOR SERVICE MANUAL
IMPORTANT SERVICE NOTES (FOR U.K. ONLY)
Beforereturning the unit to the customer after completion ofa
repairoradjustmentitisnecessaryfor the following withstand
voltage test to be applied to ensure the unit is safe for the
customer to use.
Setting of Withstanding Voltage Tester and set.
Set name set value
Withstanding Voltage Tester
Test voltage 4,240 VPEAK
3,000 VRMS
Set time 6 secs
Set current (Cutoff current) 4 mA
Unit
Judgment
OK: The “GOOD” lamp lights.
NG: The “NG” lamp lights and the buzzer sounds.
PROBE
AC OUT UNIT
SHORT-CIRCUIT
AC POWER
SUPPLY CORD
CONNECT THE PROBE
TO GND OF CHASSIS
SCREW
WITHSTANDING
VOLTAGE TESTER
LASER KLASSE 1
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT

SD-CX1H
– 4 –
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
SPECIFICATIONS
SD-CX1H
Specifications for this model are subject to change without prior notice.
CP-CX1H
General
Amplifier
CD player
Power source AC 230 V, 50 Hz
Power consumption Power on: 42 W
Power stand-by: 0.6 W (*)
Dimensions Width: 330 mm (13")
Height: 208 mm (8-3/16")
Depth: 190 mm (7-1/2")
Weight 5.0 kg (11 lbs.)
( * ) This power consumption value is obtained when the demonstration mode is can-
celled in the power stand-by mode. Cancel the demonstration mode.
Amplification system 64fs 1-bit switching
(Remarks: fs = 44.1 kHz)
Rated output power RMS: 40 W (20 W + 20 W) (DIN 45 324)
A/D noise shaping 7th-order (delta - sigma) modulation
Output terminals Speakers: 6 ohms
Headphones: 16 - 50 ohms (recommended: 32 ohms)
Input terminals Auxiliary: 500 mV/47 kohms
Type 1-disc vertical compact disc player
Signal readout Non-contact, 3-beam semiconductor laser pickup
D/A converter 1-bit D/A converter
Frequency response 20 - 20,000 Hz
Dynamic range 90 dB (1 kHz)
MiniDisc
Tuner
Type MiniDisc Recorder
Signal readout Non-contact, 3-beam semiconductor laser pickup
Rotation speed 400 - 900 rpm CLV, Approx.
Error correction ACIRC (Advanced Cross Interleave Reed-Solomon Code)
Quantization 20-bit linear (A/D converter)
Coding ATRAC (Adaptive TRansformed Acoustic Coding),
ATRAC 3
Sampling frequency 44.1 kHz
Recording method Magnetic modulation overwrite method
Frequency response 20 - 20,000 Hz
D/A converter 1-bit D/A converter
Wow and flutter Unmeasurable (less than 0.001% W. peak)
Signal/noise ratio 95 dB (1 kHz)
Dynamic range 90 dB (1 kHz)
Audio channel Stereo: 2 channels (SP, LP2, LP4)
Monaural: 1 channel (MONO)
Frequency range FM: 87.5 - 108 MHz
AM: 522 - 1,620 kHz
Type 2-way type speaker system
2 cm (13/16") Tweeter
12 cm (4-3/4") Woofer
Maximum input power 40 W
Rated input power 20 W
Impedance 6 ohms
Dimensions Width: 170 mm (6-3/4")
Height: 300 mm (11-13/16")
Depth: 186 mm (7-3/8")
Weight 2.0 kg (4.4 lbs.)/each
■
■
■
■
■

– 5 –
SD-CX1H
NAMES OF PARTS
SD-CX1H
Front panel
1.CD Cover
2.CD Cover Open/Close Button
3.Remote Sensor
4.Function Indicator
5.Timer Indicator
6.On/Stand-by Button
7.MD Compartment
8.MD Eject Button
9.MD Record Mode Button
10.CD/MD Play Mode Select Button
11.MD Stop Button
12.MD Play/Pause Button
13.CD Stop Button
14.CD Play/Pause Button
15.Volume Up or Down Button
16.Headphone Socket
17.Erase Button
18.MD Record Button
19.Auxiliary/Demo Button
20.Tuner (Band) Button
21.CD/MD Fast Reverse, Tuning Down Button
22.MD +10 Track Up Button
23.CD/MD Fast Forward, Tuning Up Button
1
23
4
5
678910
12 13 14 15
16 17 18 19 20 21
11
22 23
■
Multi-function LCD display
1.Level Meter/Character Information/Frequency Indicator
2.Band Selector Indicator
3.Record Indicator
4.CD/MD Play Indicator
5.Top Position Indicator
6.Record Mode Indicator
7.RDS Indicator
8.Traffic Programme Indicator
9.Traffic Announcement Indicator
10.MD Record Pause Indicator
11.Dynamic PTY Indicator
12.CD/MD Repeat Indicator
13.EON Indicator
14.Programme Type Indicator
15.Traffic Information Indicator
16.Surround Indicator
17.Random Play Indicator
18.Programme Play Indicator
19.Sound Synchronised Recording Indicator
20.Track Edit Indicator
21.TOC Indicator
22.FM Stereo Indicator
23.FM Stereo Mode Indicator
24.Sleep Indicator
25.Timer Pla
y
/Recordin
g
Indicator
2
1
3
4
6
5
78
91110 1213 14 15
17
19 20 21
22
23
24
25
16
18
■

SD-CX1H
– 6 –
CP-CX1H
Rear panel
1.Cooling Fan
2.Speaker Terminals
3.FM 75 Ohms Aerial Socket
4.Aerial Earth Terminal
5.AM Loop Aerial Socket
6.AC Input Socket
7.Auxiliary Input Sockets
1.Speaker Grille
2.Tweeter
3.Woofer
4.Bass Reflex Duct
5.Speaker Terminals
12
67
3
4
5
2
3
45
1
Remote control
1.Remote Control Transmitter
2.CD/MD Play Mode Select Button
3.MD Record Mode Button
4.On/Stand-by Button
5.MD Record Button
6.Top Position Button
7.Track Edit Button
8.Sound Synchronise Record Button
9.RDS EON Button
10.RDS Programme Type/Traffic Information Search Button
11.RDS ASPM (Auto Station Programme Memory) Button
12.Volume Up or Down Button
13.CD/MD Fast Reverse, Tuning Down Button
14.Extra Bass Button
15.CD/MD Programme Button
16.Clear Button
17.Name/TOC-Edit Button
18.Timer/Delete Button
19.Time Button
20.Enter Button
21.MD Stop Button
22.MD Play/Pause Button
23.CD Stop Button
24.CD Play/Pause Button
25.Tuner (Band) Button
26.Auxiliary Button
27.Surround Button
28.CD/MD Fast Forward, Tuning Up Button
29.Preset Equalizer Button
30.Character Input/CD, MD, Tuner Direct Buttons
31.Display Button
32.Recording Level/Cursor/Tuner Preset Button
33.CD/MD Edit Button
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
*
*
*
*
*
*
*
*
*
*
*
*
*
21
22
23
24
25
26
27
28
29
30
31
32
33
*
*
*
*
*
*
Buttons with "
*
" mark in the illustration can be operated on the remote control only.
Other buttons can be operated both the main unit and the remote control.
■
■

– 7 –
SD-CX1H
OPERATION MANUAL
Setting the Clock
In this example, the clock is set for 9:30 15. 02 '01 .
To confirm the time display:
[When the unit is in the stand-by mode]
Press the DISPLAY button on the remote control.
The time display will appear for about 5 seconds.
[When the power is on]
Press the TIMER/DELETE button.
Within 10 seconds, press the REC LEVEL/CURSOR or button.
The time display will appear for about 10 seconds.
Note:
The clock setting will be cleared when the unit is unplugged or the power failure
occurs.
To reset the clock:
Perform "Setting the Clock" from the beginning.
1
Press the ON/STAND-BY button to turn the power on.
2
Press the TIMER/DELETE button.
3
Within 10 seconds, press the RECLEVEL/CURSOR or button to
select the "TIME ADJUST".
4
Within 10 seconds, press the ENTER button.
5
Press the REC LEVEL/CURSOR or button to adjust the year,
and then press the ENTER button.
6
Press the REC LEVEL/CURSOR or button to adjust the month,
and then press the ENTER button.
7
Press the REC LEVEL/CURSOR or button to adjust the date,
and then press the ENTER button.
8
Press the REC LEVEL/CURSOR or button to adjust the hour,
and then press the ENTER button.
9
Press the REC LEVEL/CURSOR or button to adjust the minutes,
and then press the ENTER button.
The hour will not advance even if minutes advance from "59" to "00".
The clock starts from "0" second. (Seconds are not displayed.) The time display
will disappear after a few seconds.
●
●
Remote Control
Test of the remote control
Check the remote control after checking all connections have been made correctly.
Face the remote control directly to the remote sensor on the unit.
The remote control can be used within the range shown below:
Press the ON/STAND-BY button. Does the power turn on? Now, you can enjoy the
music.
Remote sensor
0.2 m - 6 m
(8" - 20')
■

SD-CX1H
– 8 –
Using the Radio Data System (RDS)
RDS is a broadcasting service which a growing number of FM stations provide.
These FM stations send additional signals along with their regular programme
signals. They send their station names, and information about the type of pro-
gramme such as sports or music, etc.
When tuned to an RDS station, "RDS" and the station name will be displayed.
"TP" (Traffic Programme) will appear on the display when the received broadcast car-
ries traffic information, and "TA" (Traffic Announcement) will appear whilst a traffic
information is on air.
"EON" will appear whilst the EON (Enhanced Other Networks information) data is
broadcast.
"PTYI" (Dynamic PTY Indicator) will appear whilst the Dynamic PTY station is
received.
You can control the RDS by using the remote control only.
Information provided by RDS
When you are tuning in to a station other than an RDS station or to an RDS station
which sends weak signal, the display will change in the following order:
Each time the DISPLAY button is pressed, the display will switch as follows:
Frequency Level meter
Station name (PS)
Frequency
Level meter
Programme type
(PTY)
(English fixed)
■
Descriptions of the PTY (Programme Type) codes, TP (Traffic Programme) and TA
(Traffic Announcement).
You can search for and receive the following PTY, TP and TA signals.
Note:
When you select a programme in the EON stand-by mode, the unit will display "TI" instead
of "TA".
News Short accounts of facts, events and publicly expressed views, reportage
and actuality.
Affairs Topical programme expanding or enlarging upon the news, generally in
different presentation style or concept, including debate, or analysis.
Info Programmes whose purpose is to impart advice in the widest sense.
Sport Programme concerned with any aspect of sport.
Educate Programme intended primarily to educate, of which the formal element is
fundamental.
Drama All radio plays and serials.
Culture Programmes concerned with anyaspect of national or regional culture, in-
cluding language, theatre, etc.
Science Programmes about the natural sciences and technology.
Varied Used for mainly speech-based programmes usually of light-entertainment
nature, not covered by other categories. Examples include:quizzes, panel
games, personality interviews.
Pop M Commercial music, which would generally be considered to be of current
popular appeal, often featuring in current or recent record sales charts.
Rock M Contemporary modern music, usually writtenand performed by young mu-
sicians.
Easy M Current contemporary music considered to be "easy-listening", as op-
posed to Pop, Rock or Classical, or one of the specialised music styles,
Jazz, Folk orCountry. Music inthis categoryis often butnot always,vocal,
and usually of short duration.
Light M Classical music for general, rather than specialist appreciation. Examples
of music in this category are instrumental music, and vocal or choral
works.
Classics Performances of major orchestral works, symphonies, chamber music,
etc., and including Grand Opera.
Other M Musical styles not fitting into any of the other categories. Particularly used
for specialist music of which Rhythm & Blues and Reggae are examples.
Weather Weather reports and forecasts and meteorological information.
Finance Stock Market reports, commerce, trading, etc.
Children For programmestargetedatayoung audience,primarily forentertainment
and interest, rather than where the objective is to educate.
Social Programmes about people and things that influence them individually or in
groups. Includes: sociology, history, geography, psychology and society.
Religion Any aspect of beliefs and faiths, involving a God or Gods, the nature of ex-
istence and ethics.
Phone in Involving members of the public expressing their views either by phone or
at a public forum.
Travel Features and programmes concerned with travel to near and far destina-
tions, package tours and travel ideas and opportunities. Not for use for an-
nouncements about problems, delays, or roadworks affecting immediate
travel where TP/TA should be used.
Leisure Programmes concerned with recreational activities in which the listener
might participate. Examples include, Gardening, Fishing, Antique collect-
ing, Cooking, Food & Wine, etc.
Jazz Polyphonic, syncopated music characterised by improvisation.
Country Songs which originate from, or continue the musical tradition of the Amer-
ican Southern States. Characterised by a straightforward melody and nar-
rative story line.
Nation M Current Popular Music of the Nation or Region in that country's language,
as opposed to International 'Pop' which is usually US or UK inspired and
in English.
Oldies Music from the so-called "golden age" of popular music.
Folk M Music which has its roots in the musical culture of a particular nation,usu-
ally played on acoustic instruments. The narrative or story may be based
on historical events or people.
Document Programme concerned with factual matters, presented inan investigative
style.
TEST Broadcast when testing emergency broadcast equipment or receivers.
Alarm ! Emergencyannouncementmadeunderexceptionalcircumstancestogive
warning of events causing danger of a general nature.
None No programme type (receive only).
TP Broadcasts which carry traffic announcements.
TA Traffic announcements are being broadcast.

– 9 –
SD-CX1H
What is a MiniDisc?
The disc is stored in a cartridge. You can handle it easily without worrying about dust, fin-
gerprints, etc. However, dust entering the opening of the cartridge, dirt on the cartridge,
warping, etc. may cause malfunctions. Please note the following.
To prevent recorded MiniDiscs from being
erased accidentally
Slide the accidental erase prevention tab, located on the side of the MiniDisc, in the direc-
tion indicated by the arrow.
The MiniDisc is then be protected against accidental erasure.
To add a recording to such a MiniDisc, slide the accidental erase prevention tab back to its
original position.
Helpful tip when attaching a label
When attaching a label to a MiniDisc cartridge, be sure to note the following. If the label is
not attached properly, the MiniDisc may jam inside the unit and it may not be possible to
remove it.
Types of discs
MiniDisc System Limitations
If the label peels off or partially lifts away, replace it with a new
one.
Do not put a new label on top of an existing one.
Attach the label only in the specified location.
There are two types of discs: playback-only and recordable types.
Playback-only MiniDisc:
This type of MiniDisc is used for commercially available
prerecordedmusic.Thisisthe samekindof opticaldiscas
CDs. Playback is performed using an optical pickup. (Re-
cording and editing are not possible.) A Shutter will be used on only
one side (back).
Recordable MiniDisc:
This is a "raw disc" on which recording can be performed.
A magneto optical disc is used. Recordings are made us-
ing a laser and magnetic field. Repeated recording is pos-
sible.
Shutters will be used on both
sides.
Recordable Recording
prevented
Even if the maximum recording
time of a MiniDisc has not been
reached, "TOC FULL" may be
displayed.
In the MD system, the delimiter of therecording area on
a MiniDisc is programmed in a TOC. If partial erasing,
recording and editing are repeated several times, TOC
information will fill up, even though the numberof tracks
has not reached the limit (255 tracks), and further re-
cording will beimpossible. (If youuse the all erase func-
tion, this MiniDisc can be used from the beginning.)
Even if the maximum recording
time of a MiniDisc has not been
reached, "DISC FULL" may be
displayed.
If there isany flaw on the MiniDisc, that part is automat-
ically excluded from the space available for recording.
Therefore, the recording time becomes shorter.
Even if several short tracks are
erased,theremainingrecording
time may not show an increase.
When the remaining recording time of a disc is dis-
played, short tracks less than 12 seconds long may not
be included in the total.
Two tracks may not be com-
bined in editing. For MiniDiscs on which repeated recording and editing operationswereperformed,theCOMBINEfunctionmay
not work. Atrack recorded froma CD (digital recording)
and a track recorded from a radio or other equipment
(analogue recording) cannot be combined.
The total of the recorded time
and time remaining on a disc
maynotadd uptothemaximum
possible recording time.
A cluster (about 2 seconds) is normally the minimum
unit of recording. So, even if a track is less than 2 sec-
onds long, it will use about 2 seconds of space on the
disc. Therefore, the time actually available for recording
may be less than the remaining time displayed.
If there arescratches on discs, those sections will be au-
tomatically avoided (no recording will be placed in those
sections). Therefore, the recording time will be reduced.
If recorded tracks are fast re-
versed or fast forwarded, the
sound may skip.
A MiniDiscwhich has beenrecorded oredited repeated-
ly may skip during fast reverse or fast forward.
■
■
■
●
●
●
●
●
●
Error Messages
When an error message is displayed, proceed as follows:
Error messages Meaning Remedy
BLANK MD Nothing is recorded. (Neither
music nor disc name is re-
corded.)
Replace it with another disc.
Can't COPY You tried to record from a
copy prohibited CD. Replace the CD.
Can't EDIT A track cannot be edited. Change the stop position of the
track and then try editing it.
Can't READ* The disc is damaged. Replace it with another disc.
(*: Number or
symbol) TOC information cannot be
read. Erase the disc and try recording
again.
MiniDisc not specified.
Can't REC Recording cannot be per-
formed correctly due to vibra-
tion or shock in the unit.
Re-record or replace the Mini-
Disc.
Can't T REC Timer recording is impossible
or there is no available space
on the MD.
Replace it with another record-
able disc.
The disc is out of recording
space.
Can't WRITE The TOC information could
not be created properly due to
a mechanical shock or to
scratches on the disc.
Set this unit to the stand-by
mode and try to write the TOC
again. (Remove any source of
shock or vibration whilst writing.)
CD NO DISC A CD has not been loaded. Load a CD.
The CD data cannot be read. Reload the CD.
DISC FULL The disc is out of recording
space. Replace the disc with another recordable disc.
EDIT OVER You chose 21 or more tracks
for track editing. Decrease the number of tracks.
Er - MD ** A MiniDisc is not working
properly. Press the MD button.
(**: Number or
symbol) Set this unit to the stand-by
mode and turn the power on
again.
Error messages Meaning Remedy
MD NO DISC A MiniDisc has not been load-
ed. Load a MiniDisc.
The MiniDisc data cannot be
read. Reload the MiniDisc.
NAME FULL The number of characters for
the disc name or track name
exceeds 40.
Shorten the disc or track name.
NOT AUDIO Thedatarecordedonthisdisc
is not audio data. Replace the disc.
PLAYBACK MD You tried to record on a play-
back-only disc. Replace it with another record-
able disc.
POWER ? A MiniDisc is not working
properly. Set this unit to the stand-by
mode and turn the power on
again.
PROTECTED The disc is write protected. Move the write protection tab
back to its original position.
TEMP OVER The temperature is too high. Set this unit to the stand-by
mode and wait for a whilst.
TOC FORM ** TOC information recorded on
the MD does not match the
MiniDisc specifications or it
cannot be read.
Replace it with another disc.
(**: Number or
symbol) Erase the disc and try recording again.
TOC FULL There is no space left for re-
cording track numbers. Replace it with another record-
able disc.
TOC FULL 1 There is no space left for re-
cording character information. Replace it with another record-
able disc.
Erase the needless characters.
? MD DISC The data contains an error. Press the MD button.
MiniDisc not specified. Replace it with another disc.
●
●
●
●
●●
●●
●
●
●
●●
●●
●
●●
●●
●●
●●
●●
●●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●

SD-CX1H
– 10 –
Troubleshooting Chart
Many potential "problems" can be resolved by the owner without calling a service
technician.
General
CD player
MiniDisc
Tuner
Remote control
Symptom Possible cause
"TIME ADJUST" appears when the
clock time is checked. Did a power failure occur? Reset the clock.
When a button is pressed, the unit
does not respond. Set this unit to the power stand-by mode and then turn it back on.
No sound is heard. Is the volume level set to "0"?
Are the headphones connected?
Are the speaker wires disconnected?
The picture on the TV screen is dis-
torted. When a radio or TV which uses an indoor
aerial is placed near the unit, the picture on
the TV screen may be distorted or the radio
may not function properly.
It is recommended that you use an external
aerial.
Symptom Possible cause
Eventhoughadischasbeenloaded,
"CD NO DISC" or "Can't READ" is
displayed.
The disc is very dirty.
Is the unit located near excessive vibrations?
Has condensation formed inside the unit?
Playback does not start. The disc is loaded upside down.
Playbackstopsinthemiddleorisnot
performed properly. The disc does not satisfy the standards.
The disc is distorted or scratched.
Playback sounds are skipped, or
stopped in the middle of a track. Is the unit located near excessive vibrations?
The disc is very dirty.
Has condensation formed inside the unit?
Symptom Possible cause
A recording cannot be made. Is the MiniDisc protected against accidental
erasure?
Did you try to make recording ona playback-
only MiniDisc?
Can you see the "DISC FULL" or "TOC
FULL" message in the display?
Eventhoughadischasbeenloaded,
"MD NO DISC" or "Can't READ" is
displayed.
The disc is very dirty.
Is the unit located near excessive vibrations?
Playback sounds are skipped. Has condensation formed inside the unit?
Symptom Possible cause
Radio makes unusual noise consec-
utively. The stereo system is placed near the TV or
computer.
FM/AM loop aerial is not placed properly.
Move the AC power lead away from the aeri-
al if located near.
The preset channel cannot be re-
called. Did a power failure occur?
Preset the channel again.
Symptom Possible cause
The remote control does not oper-
ate. Is the AC power lead of the stereo system plugged in?
The battery polarity is not correct.
The batteries are dead.
Incorrect distance or angle.
Does the remote control sensor receive
strong light?
■
■
■
■
■
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●●
●
●
●
●
■If trouble occurs (reset)
When this product is subjected to strong external interference (mechanical shock, excessive static electricity,
abnormal supply voltage due to lightning, etc.) or if it is operated incorrectly, it may malfunction.
If such a problem occurs,do the following:
Unplug the power lead from the AC socket.Then, plug it in again and retry the operation.
■Before transporting the unit
Remove the CD and MD from the unit.Your unit
checks whether there are any discs inside. "CD
NO DISC" and "MD NO DISC" appear if no disc is
inside. Then, set the unit to the power stand-by
mode. Carrying the unit with discs left inside can
damage it.
1Press theTUNER (BAND) button repeatedly to select the desired frequency
band (FM STEREO, FM or AM).
2Press theTUNING ( or ) button to tune in to the desired station.
●When the TUNING ( or ) button is pressed for more than 0.5 seconds, scanning will
start automatically and the tuner will stop at the first receivable broadcast station.
3To receive an FM stereo transmission, press the TUNER (BAND) button.
The“STEREO” indicator lights up.
●“ST” will appear when an FM broadcast is in stereo.
Listening to the Radio
Accessories
Non-slip sheet
for speakers × 8
“AA” size battery
(UM/SUM-3, R6, HP-7 or similar) × 2
Remote control × 1 FM aerial × 1
Speaker wire × 2
1 2 3
Battery installation of remote control
Use 2 “AA” size batteries (UM/SUM-3, R6,HP-7 or similar).
Open the Insert the batteries Close the
battery cover.
as shown. battery cover.
1
1
2
2
AM loop aerial × 1
AC power lead × 1
For U.K. Except for U.K.

– 11 –
SD-CX1H
System Connections
3
3
Wall socket
(AC 230V, 50 Hz)
For U.K.
FM aerial
Left speaker
Right speaker
To the line
output sockets
RCA lead
(Not supplied)
VCR, DVD, etc.
TV
Left speaker
Clear
Black line
Right speaker
AM loop aerial
Adhere the non-slip
sheets to the bottom
of the speaker.
Adhere the non-slip sheets on
the lower back of the speaker,
and then mount it to the wall.
How to apply non-slip sheet
Wall socket
(AC 230V, 50 Hz)
Except for U.K.
Listening to a MiniDisc
1Press the CD button.
2Press the CD button to open the CD cover.
3Set the CD and press the CD button.
4Press the CD button to start playback.
Listening to a CD
Total number of tracks
Turn on your System
The first time the unit is plugged in,
the unit will enter the demonstration
mode.You will see words scroll.
2
1
Press the AUX (DEMO)
button to cancel the
demonstration mode.
Press the ON/STAND-
BY button to turn the
power on.
4
4
Total playing time
Disc name Total number of
tracks Total playing time
1Open the control panel cover.
Control panel cover
2Press the MD button.
3Load a MiniDisc into the MD compartment, label side up.
4Press the MD button to start playback.
Label side facing you.
Label side up.

SD-CX1H
– 12 –
DISASSEMBLY
Figure 12-3
Figure 12-1
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 compact disc and mini disc out of the unit.
2. Be sure to remove the power supply plug from the
wall outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need
to be removed when disassembling the unit. After
servicing the unit, be sure to rearrange the leads
where they were before disassembling.
4. Take sufficient care on static electricity of integrated
circuits and other circuits when servicing.
1 Rear Cabinet 1. Screw ................ (A1) x3 12-1
2. Screw ................ (A2) x8
2 Front Panel 1. Flat Cable.......... (B1) x2 12-2
2. Screw ................ (B2) x2
3. Screw ................ (B3) x5
4. Socket ............... (B4) x3
3 Rear Panel 1. Screw ................ (C1) x3 12-2
2. Screw ................ (C2) x2
3. Screw ................ (C3) x3
4 1 BIT Amp. Unit 1. Screw ................ (D1) x1 12-3
2. Screw ................ (D2) x2
3. Socket ............... (D3) x5
5 Power PWB 1. Screw ................ (E1) x1 13-1
2. Socket ............... (E2) x2
3. Flat Cable.......... (E3) x1
6 Tuner PWB 1. Screw ................ (F1) x1 13-1
2. Socket ............... (F2) x1
7 Main PWB 1. Screw ................ (G1) x3 13-2
2. Flat Cable.......... (G2) x1
8 MD Unit 1. Screw ................ (H1) x4 13-2
9 CD PWB 1. Flat Cable.......... (J1) x1 13-3
(Note) 2. Socket ............... (J2) x5
3. Screw ................ (J3) x3
10 Switch PWB 1. Screw ................ (K1) x1 13-3
11 CD Mechanism 1. Screw ................ (L1) x2 13-3
2. Screw ................ (L2) x2
12 Display PWB/ 1. Screw ................ (M1) x11 13-4
CD Eject PWB/ 2. Socket ............... (M2) x1
Headphones PWB 3. Hook .................. (M3) x2
13 LED PWB 1. Solder joint ........ (N1) x4 13-4
2. Hook .................. (N2) x1
14 1 BIT Amp. PWB 1. Screw ................ (P1) x2 13-5
2. Fan Motor.......... (P2) x1
3. Screw ................ (P3) x2
4. Fan Bracket....... (P4) x1
5. Screw ................ (P5) x2
6. Amp. Bracket .... (P6) x1
7. Screw ................ (P7) x4
8. Amp. Heat Sink . (P8) x1
9. Screw ................ (P9) x4
10. Washer............ (P10) x2
11. Screw .............. (P11) x4
12. Shield Case..... (P12) x1
13. Screw .............. (P13) x4 13-6
14. Shield Case..... (P14) x1
STEP REMOVAL PROCEDURE FIGURE
SD-CX1H
(A1)x3
ø3 x12mm
(A2)x1
ø3 x8mm
(A2)x1
ø3 x8mm
(A2)x6
ø3 x8mm
Front Panel
Rear Panel
Rear Cabinet
Note:
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector remove to protect the optical pickup
from electrostatic damage.
Figure 12-2
SD-CX1H
(B2)x2
ø3x8mm
(B3)x1
ø3x8mm
(B3)x1
ø3x8mm
(B3)x3
ø3x8mm
(B4)x2
(B1)x2
(C3)x3
ø3x6mm
(C1)x3
ø3x8mm
(C2)x2
ø3x10mm
(B4)x1
Display PWB
Amp. Unit
Front panel
CD PWB
Lug Wire
Tuner
PWB
Power
PWB
Rear Panel
(D1)x1
ø3x8mm
(D3)x5
(D2)x1
ø3x6mm
(D2)x1
ø3x6mm
MD Unit
1 Bit Amp.
Unit
Power PWB
Main PWB
Tuner PWB

– 13 –
SD-CX1H
Figure 13-1
Figure 13-2
Figure 13-3
Figure 13-4
Figure 13-5
Figure 13-6
(M2)x1
(M3)x2
(M1)x8
ø3x8mm
(M1)x1
ø3x8mm
(M1)x2
ø3x8mm
CD
Eject
PWB
Display PWB
Front Panel
Headphons
PWB
(N1)x4
LED PWB
(N2)x1
(P1)x2
ø3x6mm
(P11)x1
ø3x6mm
(P9)x2
ø3x8mm
(P6)x1
(P4)x1
(P2)x1
(P10)x1
(P11)x1
ø3x6mm
(P11)x1
ø3x6mm
(P9)x1
ø3x8mm
(P11)x1
ø3x6mm
(P5)x2
ø3x6mm (P7)x4
ø3x8mm
(P3)x2
ø3x6mm
(P10)x1
(P8)x1
(P12)x1
(P9)x1
ø3x8mm
1 Bit Amp.
Unit
(P13)x4
ø3x10mm
(P14)x1
1 Bit Amp. PWB
Be careful of the
silicon grease.
(J3)x2
ø3x8mm
(L2)x2
ø3x8mm
(L1)x2
ø3x20mm
(K1)x1
ø3x8mm
(J3)x1
ø3x8mm
(J1)x1
(J2)x1
(J2)x1
(J2)x2
(J2) x1
CD PWB
Front Panel
Spacerx2
CD Motor PWB
CD Mechanism
Switch PWB
(H1)x2
ø3x6mm
(H1)x2
ø3x6mm
(G1)x3
ø3x8mm
(G2)x1
Sub
Trans
PWB
Main PWB
MD Unit
(E2)x1 (E2)x1
(F2)x1
(E3)x1
(E1)x1
ø3x6mm
(F1)x1
ø3x10mm
Power
PWB
Tuner
PWB
Main
Trans
PWB
Sub Trans
PWB
Main PWB
MD Unit

SD-CX1H
– 14 –
Figure 14-1
15 MD Mechanism 1. Screw .............. (Q1) x4 14-1
holder (Left/Right)
16 Shield Cover 1. Screw .............. (Q2) x5 14-1
(Top/Side/Bottom) 2. Screw .............. (Q3) x1
17 MD Mechanism 1. Flat Cable........ (Q4) x3 14-1
2. Socket ............. (Q5) x2
3. Flexible PWB .. (Q6) x1
18 MD Main PWB 1. Screw .............. (Q7) x2 14-1
STEP REMOVAL PROCEDURE FIGURE
SD-CX1H (MD MECHANISM UNIT)
Figure 14-3
1 Rear Cabinet 1. Screw ............ (A1) x6 14-2
2 Tweeter 1. Screw ............ (B1) x4 14-3
3 Woofer 1. Screw ............ (B2) x4 14-3
STEP REMOVAL PROCEDURE FIGURE
CP-CX1H
Figure 14-2
(A1)x6
ø4x16mm
Net
Front Panel
Rear Cabinet
(B1)x4
ø4x12mm
(B2)x4
ø4x12mm
Net Front Panel
Woofer
Tweeter
(Q4)x2
(Q3)x1
ø2x2mm
(Q2)x1
ø2x3mm
(Q2)x1
ø2x3mm
(Q2)x1
ø2x3mm
(Q2)x1
ø2x3mm
(Q4)x1
(Q5)x1
(Q5)x1
(Q2)x1
ø2x3mm
(Q7)x2
ø1.7x3mm
(Q6)x1
(Q1)x2
ø3x6mm
(Q1)x2
ø3x6mm
Shield Cover,Top
MD Mechanism
Shield Cover,Side
Shield Cover,Bottom
MD Main PWB
Optical pickup
Flexible PWB (Note 1)
(Note 1)
After removing the flexible PWB for optical pickup from the connector
wrap the front end of flexible PWB in conductive aluminum foil so as
to protect the optical pickup from being damaged electrostatically.
Pull
Pull
MD Mechanism
Holder (Right)
MD Mechanism
Holder (Left)

– 15 –
SD-CX1H
REMOVING AND REINSTALLING THE MAIN PARTS
MD MECHANISM SECTION
FordetailsabouttheproceduretoremovetheMDmechanism
fromthemainunit,refertotheDisassemblyProcedure,Steps
1-8 and 15-16 in the main unit and also the MD section.
(Referring to page14)
Caution:
After pulling out the optical pickup connector, wrap the end
ofthe connector inconductivealuminium foil toprevent the
optical pickup from being destroyed by static electricity.
How to remove the magnetic head
(See Fig. 15-1)
1. Remove the screw (A1) x 1 pc.
Caution:
Takeutmostcaresothatthemagneticheadisnotdamaged
when it is mounted. Figure 15-1
How to remove the MD loading motor PWB/MD
loading motor
(See Fig. 15-2)
1. Remove the screw (B1) x 1 pc.
2. Remove the Hooks (B2) x 3 pcs., and remove the MD
Loading PWB.
3. Remove the screws (B3) x 2 pcs., and remove the MD
Loading motor.
HowtoremovetheMDsledmotor/opticalpickup
(See Fig. 15-3)
1. Remove the screws (C1) x 3 pcs., and remove the MD sled
motor.
2. Remove the optical pickup.
Caution:
Be careful so that the gear is not damaged.
(The damaged gear emits noise during searching.)
Figure 15-2
Figure 15-3
MD Mechanism
(A1)x1
ø1.7x 5mm
Magnetic Head
Optical Pickup
(B3)x2
ø1.7x 3mm
(B1)x1
ø1.7x 6mm
MD Loading Motor
MD Loading
Motor PWB
(B2)x2
(B2)x1
(C1)x2
ø1.4x4.5mm
(C1)x1
ø1.4x5mm
Optical
Pickup MD Sled Motor
MD Mechanism
Switch PWB
Washer

SD-CX1H
– 16 –
Figure 16-1
How to remove the MD spindle motor
(See Fig. 16-1)
1. Remove the screws (D1) x 3 pcs., and remove the MD
spindle motor.
Caution:
Be careful so that the gear is not damaged.
(The damaged gear emits noise during searching.)
CD MECHANISM SECTION
Perform steps 1 to 11 of the disassembly method to remove
the CD mechanism. (See page 13.)
Note:
After removing the connector for the optical pickup from the
connector, wrap the conductive aluminium foil around the
front end of connector remove to protect the optical pickup
from electrostatic damage.
Figure 16-2
Figure 16-3
How to Remove the CD lid motor
(See Fig. 16-3.)
1. Remove the front panel.
(Refer to the disassembly method on page 12.)
2. Remove the screws (B1) x 4 pcs.
3. Remove the CD lid gear unit from the front panel.
4. Remove the screws (B2) x 5 pcs. to remove the gear box
B.
5. Remove the gear (B3) x 1 pc.
6. Remove the screws (B4) x 2 pcs. to remove the CD lid
motor.
(D1)x3
ø1.4x 3mm
MD Spindle Motor
(A2) x2
ø2.6 x6mm
(A1) x4
Shaft
(A3) x1
Gear
(A5) x1
Stop Washer
(A4) x1
CD Mechanism Cover
CD Mechanism
Pickup
How to remove the pickup (See Fig. 16-2)
1. Remove the mechanism cover, paying attention to the
pawls (A1) x 4 pcs.
2. Remove the screws (A2) x 2 pcs., to remove the shaft
(A3) x 1 pc.
3. Remove the stop washer (A4) x 1 pc., to remove the
gear (A5) x 1 pc.
4. Remove the pickup.
Caution:
Be careful not to damage the gear.
(Ifthegearisdamaged,noiseis heardwhensearching.)
Gear Box A
CD Lid Motor
(B4)x2
ø2x5mm
Gear
(B3)x1
Gear Box B
(B2)x5
ø2x10mm
(B1)x4
ø3x10mm
CD Lid Gear Unit
CD Lid
Motor
Front Panel

– 17 –
SD-CX1H
DESCRIPTION OF CIRCUIT FOR 1-BIT AMP. UNIT
(SEE THE WIRING DIAGRAMS ON PAGES 52 AND 53.)
Input
Signals over certain level input from BIA106 are sliced into waveforms by RA173 (RA174), DA126, and DA127 (DA128, DA129).
The slice levels depend on the output of the unit.
In case of 25 W output setting, the level is set to gain distortion of approx. 10 % during output.
The level on the positive side is determined by RA175, RA177 and RA179 and that on the negative side by RA176, RA178, and
RA180, respectively.
After DC cut by CA108, the signals are input to AD conversion IC.
modulation 1-bit conversion
The signals input to the AD conversion IC are converted into 1-bit signals for differential output.
For detailed technical description of 1-bit signal conversion, refer the technical manual for SM-SX100 already published.
Dead time and level shift
When the 1-bit signals are output from the AD conversion IC, the leading edge of the waveform is delayed for 20 to 25 nsec by
DA103 (DA102, DA101, and DA100), RA115 (RA114, RA113, and RA112), and CA155 (CA154, CA153, and CA152), compared
with the trailing edge.
As mentioned below, this operation is for reducing switching circuit loss in the final stage.
The signals are input to the buffer IC (AND gate IC) for the waveform format and are output.
Then the DC level is shifted by CA115 (CA114, CA113, and CA112), DA107 (DA106, DA105, and DA104) and RA120 (RA119,
RA118,andRA117).ThisisbecausethebufferICoperatesbetweengroundand+5V,whilethenextstageIC,gatedriver(ICA101
to ICA 104), operates between the negative power source and + 9 V.
The shift quantity is output with amplitude of 5 V, based on the voltage raised by DA108 and DA109 from the bottom by approx.
2 V.
Output of gate driver
The level-shifted signals are input to the gate driver IC (HIP2100).
Since the final stage FET array is H bridge, two gate drivers are used for 1 CH.
At this time, + and - of differential signals are input by crossing diagonally for the two gate drivers.
(Positive output to ICA101 (ICA103) Hin and ICA102 (ICA104) Lin, and negative output to ICA102 (ICA104) Hin and ICA101
(ICA103) Lin.)
Output of the gate driver drives the gate of FET array connected to H bridge.
FET consists of the lower stage where source is connected to the negative power and the upper stage where drain is connected
to the positive power. Lout and Hout are connected to the gate, respectively.
The lower stage FET is driven with 9 V amplitude based on the negative power because the reference voltage is same as in the
gate driver. The upper stage FET does not operate as it is because it is based on the positive power. Therefore this gate drive IC
(HIP2100) makes up bootstrap, by feeding back from FET output.
As a result, amplitude of Hout is approx. + 6V of the positive power, based on the negative power.
Low-pass filter circuit
1-bit signals switched at FET are converted into analog signals via the low-pass filter consisting of LA100 (LA102, LA104, and
LA106) and CA142 (CA143, CA150, and CA151).
Property of the low-pass filter is flat up to 20 kHz and then is attenuated by approx. 3 dB at around 30 kHz.
Dynamic feedback circuit
1-bit signals switched at FET of output stage are amplified between the positive and negative power sources.
With resistance divided, 1-bit signals are fed back to AD conversion IC, via NF resistance 75 kohms.
P-P voltage, which becomes approx. 4 to 7V, is determined by the regulation property of the transformer depending on the output
level.

SD-CX1H
– 18 –
TO CHECK AND CANCEL PROTECT CIRCUIT DETECTION LINE
1. Afterpower supply, the microcomputer(ICD01) built in thismodel consecutively monitors thefollowing errors 1 to 4. If any error
occurs, 'Er_AP00' is displayed and all power supply except for the one to drive the microcomputer is interrupted.
1 Abnormal output voltage drop of each regulator (below approx. 3 V)
2 Excessive output offset of 1-bit amplifier (over approx. 2 V of DC potential)
3 Excessive main supply current of 1-bit amplifier (over DC approx. 5.5 A)
4 Abnormalities of cooling fan motor and its driving circuit (stop, etc.)
2. Criteria for judging errors of built-in microcomputer and checking/cancelling detection line
Condition: The voltage of microcomputer pin 7 (PROTECT) lowering below 3.5 V is regarded as an error.
(In the demonstration mode to stop cooling fan, the voltage of 1.5 V is regarded as an error.)
Checking/Cancelling
Caution: When interrupting the PROTECT detection line, the microcomputer does not operate protectively. In case of an error
caused by output short-circuit of each regulator, components and board on the spot may be burnt. Do not interrupt the
PROTECT detection line of the microcomputer, if any cause other than the above mentioned is not identified.
(For approx. 0.5 seconds after error detection, power is supplied; power supply can be checked with an oscilloscope,
etc. As leading and trailing edges of the voltage are so steep that the power supply cannot be checked by the tester.)
1. Abnormal output voltage drop of each regulator
Connectthemeasuringapparatus(oscilloscope,etc.)tothestabilizedoutputoftheregulatortoturnontheunitpowerswitch.
If the stabilized output is far smaller (below approx. 3 V) than that shown in the circuit diagram, the regulator and the circuit
to be supplied with the power may be defective.
2. Excessive output offset of 1-bit amplifier
AfterdisconnectingtheCNPV99(speakeroutputconnectorof1-bitamplifier),turnontheunitpowerforthenormaloperation.
(No sound is heard from the speaker.)
* After repairing, adjust the output offset voltage of 1-bit amplifier as shown on page 24.
If the protective operation is observed even after disconnecting the CNPV99, circuits QV95 to 98 (DC voltage detection of
speaker output) may be defective.
3. Excessive main supply current of 1-bit amplifier
After disconnecting the CNP801 (main power source connector of 1-bit amplifier), turn on the unit power for the normal
operation. (No sound is heard from the speaker.)
* After repairing, adjust the output offset voltage of 1-bit amplifier as shown in page 30.
If the protective operation is observed even after disconnecting the CNP801, the circuit of ICV98/ICV99 (supply current
detection circuit) may be defective.
4. Abnormalities of cooling fan motor and its driving circuit (stop, etc.)
Turn on the unit to visually inspect the cooling fan motor till the protective operation starts.
* If the fan is rotating forcefully;
QV94, contact of the CNPV97 (connector for fan motor), or fan may be defective. (CNPV97 pin 3 potential during normal
fan operation is approx. 0 V.)
* When the fan is not rotating or seems to be stopping.
If it is checked that the CNPV97 (connector for fan motor) is not defective and it is also checked by oscilloscope, etc that
voltage of pin 1 (red line of fan) is approx. 6 V, the fan may be defective.
When the voltage of the CNPV97 pin (1) is far lower than 6 V, and base voltage of QV93 is almost the same as that shown
in the circuit diagram, the fan or the circuit consisting of PSV801, QV85, QV87, and QV93 may be defective.
When the base voltage of QV85 is 0 V or extremely lower than the value shown in the circuit diagram (3.5 V), the system
control terminal of SOV90 may be defective.

– 19 –
SD-CX1H
1-BIT AMP. SECTION
Wiring diagram of the 1-bit Amp. unit
Figure 19
Core
Core
Core
1 Bit Amp. Unit
Nylon Band
Nylon Band Nylon Band
Afterthe wires fromthe1-bit amp PWBare wound aroundthe
cores as shown in Fig. 19, secure them to the chassis of amp
unit with nylon bands (4 pcs).
TEST MODE
From power off state to TEST mode
Press the +10 Track Up button (+10) and MD REC LEVEL/MD Fast Forward button ( ) simultaneously while the POWER
button of the main unit is on to obtain the TEST mode. Initially, the version is displayed.
Thereafter press the MD REC LEVEL/MD Fast Forward button ( ) to select the TEST mode and then press the +10 Track
Up button (+10) to determine it.
Press the DIRECT key during version display to obtain the designated TEST mode directly.
TEST MODE
No. TEST MODE DIRECT KEY DISPLAY
1 CD TEST CD PLAY (CD ) CD MENU
2 MD TEST MD PLAY (MD ) MD MENU
*3 MD DISP TEST ERASE MD DIS MENU
*4 REC AGING MD REC ( REC) REC MENU
5 AUX TEST AUX (DEMO) AUX MENU
*6 CALENDAR TEST CD STOP (CD ) DATE MENU
7 KEY TEST VOLUME UP (VOLUME ) KEY MENU
8 TUNER TEST TUNER/BAND TUN MENU
*9 LINE TEST MD STOP (MD ) MD-LINE MENU
*10 R/P AGING REC MODE AGING MENU
*11 CD LID TEST CD-OP/CL( ) OP/CL MENU
The TEST modes 3, 4, 6, 9, 10, and 11 marked with * are under technical examination; their descriptions are omitted.
Cancelling the TEST mode
In each TEST mode, press the POWER button to display COMPLETE for 1 second and then cancel the TEST mode.
In the MD TEST mode, press the POWER button again.

SD-CX1H
– 20 –
Figure 20
Test mode
Version display
Version display
to MD-PLAY
Version display
to ERASE
Version display
to MD-REC
Version display
to AUX(DEMO)
Version display
to CD-STOP
Version display
to VOL-UP
Version display
to TUNER/BAND
With SKIP-UP button
SKIP-DWN
SKIP-UP
Version display
to CD-PLAY
Version display
to MD-STOP
Version display
to REC-MODE
Version display
to CD-OP/CL
SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN
SKIP-UP SKIP-DWN