Sharp QT-CD121H (serv.man2) Service Manual ▷ View online
– 1 –
QT-CD121H/112H
CONTENTS
Page
SAFETY PRECATION FOR SERVICE MANUAL .............................................................................................................. 2
IMPORTANT SERVICE NOTES (121H FOR UK ONLY) .................................................................................................. 3
SPECIFICATIONS ............................................................................................................................................................. 3
NAMES OF PARTS ........................................................................................................................................................... 4
REMOTE CONTROL (121H ONLY) .................................................................................................................................. 5
DISASSEMBLY .................................................................................................................................................................. 6
REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 7
ADJUSTMENT ................................................................................................................................................................... 8
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 11
TYPES OF TRANSISTOR ............................................................................................................................................... 11
BLOCK DIAGRAM ........................................................................................................................................................... 12
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ............................................................................................. 16
WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 28
TROUBLESHOOTING ..................................................................................................................................................... 29
FUNCTION TABLE OF IC ................................................................................................................................................ 32
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (121H FOR UK ONLY)
IMPORTANT SERVICE NOTES (121H FOR UK ONLY) .................................................................................................. 3
SPECIFICATIONS ............................................................................................................................................................. 3
NAMES OF PARTS ........................................................................................................................................................... 4
REMOTE CONTROL (121H ONLY) .................................................................................................................................. 5
DISASSEMBLY .................................................................................................................................................................. 6
REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 7
ADJUSTMENT ................................................................................................................................................................... 8
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 11
TYPES OF TRANSISTOR ............................................................................................................................................... 11
BLOCK DIAGRAM ........................................................................................................................................................... 12
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ............................................................................................. 16
WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 28
TROUBLESHOOTING ..................................................................................................................................................... 29
FUNCTION TABLE OF IC ................................................................................................................................................ 32
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (121H FOR UK ONLY)
• 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.
be used.
QT-CD121H
QT-CD112H
QT-CD112H
SERVICE MANUAL
SHARP CORPORATION
No. S7857QTCD121H
Illustration: QT-CD121H
Illustration: QT-CD112H
• Note for users in UK
Recording and playback of any material may require consent
which SHARP is unable to give. Please refer particularly to the
provisions of Copyright Act 1956, the Dramatic and Musical
Prefomers Protection Act 1956, the Preformers Protection Acts
1963 and 1972 and to any subsequent statutory enactments and
orders.
which SHARP is unable to give. Please refer particularly to the
provisions of Copyright Act 1956, the Dramatic and Musical
Prefomers Protection Act 1956, the Preformers Protection Acts
1963 and 1972 and to any subsequent statutory enactments and
orders.
DIFFERENCE BETWEEN QT-CD121H AND QT-CD112H
QT-CD121H
TUNER
2 BAND
3 BAND
FINE TUNING
TWEETER
REMOTE CONTROL
QT-CD112H
– 2 –
QT-CD121H/112H
SAFETY PRECATION FOR
SERVICE MANUAL
Precaution to be taken when replacing and servicing the
Laser Pickup.
Laser Pickup.
The ael (ACCESSIBLE EMMISSION 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.
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) When the cabinet is removed, the power is turned on
without a compact disc in position and the pick-up is on the
outer edge the laser will light for several seconds to detect
a disc. Do not look into the pick-up lens.
outer edge the laser will light for several seconds to detect
a disc. Do not look into the pick-up lens.
(2) The laser power output of the pick-up unit and replacement
service parts are all factory pre-set before shipment.
Do not attempt to re-adjust the laser pick-up unit during
replacement or servicing.
replacement or servicing.
(3) Under no circumstances stare into the pick-up lens at any
time.
(4) CAUTION-USE of controls or adjustments, or pereformance
of procedures other than those specified herein may result
in hazardous radiation exposure.
in hazardous radiation exposure.
(121H For UK/New Zealand)
(112H/121H Except for UK/New Zealand)
LASER KLASSE 1
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT
(Illustration: QT-CD121H)
CAUTION-INVISIBLE LASER RADIATION WHEN OPEN. DO NOT STARE INTO
BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS.
BEAM OR VIEW DIRECTLY WITH OPTICAL INSTRUMENTS.
VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD. STIRRA
EJ IN I STRALEN OCH BETRAKTA EJ STRALEN MED OPTISKA INSTRUMENT.
EJ IN I STRALEN OCH BETRAKTA EJ STRALEN MED OPTISKA INSTRUMENT.
ADVERSEL-USYNLIG LASERSTRALING VED ABNING. SE IKKE IND I
STRALEN-HELLER IKKE MED OPTISKE INSTRUMENTER.
STRALEN-HELLER IKKE MED OPTISKE INSTRUMENTER.
VARO! AVATTAESSA OLET ALTTIINA NAKYMATON LASERSATEILYLLE.
ALA TUIJOTA SATEESEEN ALAKA KATSO SITA OPTISEN LAITTEEN LAPI.
ALA TUIJOTA SATEESEEN ALAKA KATSO SITA OPTISEN LAITTEEN LAPI.
VARNING-OSYNLIG LASERSTRALNING NAR DENNA DEL AR OPPNAD.
STIRRA EJ IN I STRALEN OCH BETRAKTA EJ STRALEN GENOM OPTISKT
INSTRUMENT.
STIRRA EJ IN I STRALEN OCH BETRAKTA EJ STRALEN GENOM OPTISKT
INSTRUMENT.
ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.
VAROITUS! LAITTEEN KÄYTTÄMINEN
MUULLA KUIN TÄSSÄ
KÄYTTÖOHJEESSA MAINITULLA
TAVALLA SAATTAA ALTISTAA
KÄYTTÄJÄN TURVALLISUUSLUOKAN 1
YLITTÄVÄLLE NÄKYMÄTTÖMÄLLE
LASERSÄTEILYLLE.
MUULLA KUIN TÄSSÄ
KÄYTTÖOHJEESSA MAINITULLA
TAVALLA SAATTAA ALTISTAA
KÄYTTÄJÄN TURVALLISUUSLUOKAN 1
YLITTÄVÄLLE NÄKYMÄTTÖMÄLLE
LASERSÄTEILYLLE.
VARNING - OM APPARATEN ANVÄNDS
PÅ ANNAT SÄTT ÄN I DENNA
BRUKSANVISNING SPECIFICERAS. KAN
ANVÄNDAREN UTSÄTTAS FÖR OSYNLIG
LASERSTRÅLNING, SOM ÖVERSKRIDER
GRÄNSEN FÖR LASERKLASS 1.
PÅ ANNAT SÄTT ÄN I DENNA
BRUKSANVISNING SPECIFICERAS. KAN
ANVÄNDAREN UTSÄTTAS FÖR OSYNLIG
LASERSTRÅLNING, SOM ÖVERSKRIDER
GRÄNSEN FÖR LASERKLASS 1.
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
– 3 –
QT-CD121H/112H
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
TO THE OPERATION MANUAL.
SPECIFICATIONS
General
Power source:
AC 230 - 240 V, 50 Hz
DC 12 V [ "D" size (UM/SUM-1,
R20 or HP-2) battery x 8]
DC 12 V [ "D" size (UM/SUM-1,
R20 or HP-2) battery x 8]
Power consumption:
11 W
Output power:
PMPO; 28 W (total)
(112H/121H Except for
MPO; 8.4 W (4.2 W + 4.2 W)
UK/New Zealand)
(AC operation, DIN 45 324)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, DIN 45 324)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, DIN 45 324)
Output power:
MPO (Max.); 8.4 W (4.2 W + 4.2 W)
(121H For UK)
(AC operation)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, 10 % T.H.D.)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, 10 % T.H.D.)
Output power:
PMPO; 28 W (total)
(121H For
MPO (Max.); 8.4 W (4.2 W + 4.2 W)
New Zealand)
(AC operation)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, 10 % T.H.D.)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, 10 % T.H.D.)
Speakers:
10 cm (4") Woofer x 2
(121H Except for UK/
Tweeter x 2
New Zealand)
Speakers:
Speakers:
10 cm (4") full-range speaker x 2
(121H For UK/
Tweeter x 2
New Zealand)
Speakers:
Speakers:
10 cm (4") full-range speaker x 2
(112H)
Output terminal:
Output terminal:
Headphones; 16-50 ohms
(recommended 32 ohms)
(recommended 32 ohms)
Dimensions:
Width; 480 mm (18-15/16")
Height; 153 mm (6-1/16")
Depth; 254 mm (10")
Height; 153 mm (6-1/16")
Depth; 254 mm (10")
Weight:
3.2 kg (7.1 Ibs.) without batteries
Radio
Frequency range:
FM; 87.6 - 108 MHz
(121H)
AM; 526.5 - 1,606.5 kHz
Frequency range:
FM; 88 - 108 MHz
(112H)
SW; 5.95 - 18 MHz
MW; 526.5 - 1,606.5 kHz
MW; 526.5 - 1,606.5 kHz
Tape recorder
Frequency response:
50 - 14,000 Hz (Normal tape)
Signal/noise ratio:
50 dB
Wow and flitter:
0.3 % (DIN 45 511)
(112H/121H Except for UK/New Zealand)
Wow and flitter:
Wow and flitter:
0.25 % (WRMS)
(121H For UK/New Zealand)
Motor:
Motor:
DC 12 V electric governor
Bias system:
AC bias
Erase system:
Magnet erase
Compact disc player
Disc:
Compact disc
Signal readout:
Non-contact, 3-beam semi-
conductor laser pickup
conductor laser pickup
Audio channels:
2
Quantization:
16-bit linear quantization
Filter:
4-tims oversampling digital filter
D/A converter:
1-bit D/A converter
Wow and flutter:
Unmeasurable
(less than 0.001% W. peak)
(less than 0.001% W. peak)
Specifications for this model are subject to change without
prior notice.
prior notice.
IMPORTANT SERVICE NOTES (121H FOR UK ONLY)
Before returning the unit to the customer after completion of a
repair or adjustment it is necessary for 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.
repair or adjustment it is necessary for 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
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 buzzor sounds.
NG: The “NG” lamp lights and the buzzor sounds.
PROBE
AC
OUT
UNIT
SHORT-CIRCUT
AC POWER
SUPPLY CORD
AC POWER
SUPPLY CORD
CONNECT THE PROBE
TO GND OF BATTERY
SPRING
TO GND OF BATTERY
SPRING
WITHSTANDING
VOLTAGE TESTER
– 4 –
QT-CD121H/112H
NAMES OF PARTS
QT-CD121H
Front panel
1. Cassette Compartment
2. CD Compartment
3. Tuning Control
4. (TAPE) Record Button:
5. (TAPE) Play Button:
6. (TAPE) Rewind Button:
7. (TAPE) Fast Forward Button:
8. (TAPE) Stop/Eject Button:
9. (TAPE) Pause Button:
1. Cassette Compartment
2. CD Compartment
3. Tuning Control
4. (TAPE) Record Button:
5. (TAPE) Play Button:
6. (TAPE) Rewind Button:
7. (TAPE) Fast Forward Button:
8. (TAPE) Stop/Eject Button:
9. (TAPE) Pause Button:
10. CD Eject Button:
/
11. (CD) Play Indicator:
12. (CD) Track Number Indicator
13. (CD) Repeat Indicator:
14. Volume Control
15. Stand-by, On/Function Switch
16. Extra Bass Button: X-BASS
17. Surround Button
18. (CD) Track Down/Review Button:
19. (CD) Track Up/Cue Button:
20. (CD) Stop Button:
21. (CD) Play/Repeat Button:
12. (CD) Track Number Indicator
13. (CD) Repeat Indicator:
14. Volume Control
15. Stand-by, On/Function Switch
16. Extra Bass Button: X-BASS
17. Surround Button
18. (CD) Track Down/Review Button:
19. (CD) Track Up/Cue Button:
20. (CD) Stop Button:
21. (CD) Play/Repeat Button:
Rear panel
22. FM Telescopic Rod Aerial
23. Headphones Socket
24. Battery Compartment
25. AC Power Input Socket
22. FM Telescopic Rod Aerial
23. Headphones Socket
24. Battery Compartment
25. AC Power Input Socket
Remote control
1. (CD) Play/Repeat Button:
2. (CD) Track Down/Review Button:
3. (CD) Pause Button:
4. (CD) Track Up/Cue Button:
5. (CD) Stop Button:
1. (CD) Play/Repeat Button:
2. (CD) Track Down/Review Button:
3. (CD) Pause Button:
4. (CD) Track Up/Cue Button:
5. (CD) Stop Button:
1
2
3
4 5 6 7 8 9 10
11 12
13
14 15 16 17 18 19 20 21
22
24
25
23
2
3
1
4
5
