Sharp QT-CD250 (serv.man6) Service Manual ▷ View online
QT-CD250H/W
– 1 –
• 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-CD250H(S)
QT-CD250W(S)
QT-CD250W(S)
SERVICE MANUAL
SHARP CORPORATION
No. S3017QTCD250H
Illustration: QT-CD250H
• Note for users in U.K.
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
Performers Protection Act 1956, the Performers 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
Performers Protection Act 1956, the Performers Protection Acts
1963 and 1972 and to any subsequent statutory enactments and
orders.
CONTENTS
Page
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR (FOR QT-CD250W) ................................................................ 1
SAFETY PRECAUTION FOR SERVICE MANUAL ........................................................................................................... 2
IMPORTANT SERVICE NOTES (QT-CD250H FOR U.K. ONLY) .................................................................................... 3
VOLTAGE SELECTION (QT-CD250W ONLY) .................................................................................................................. 3
SPECIFICATIONS ............................................................................................................................................................. 3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 5
DISASSEMBLY .................................................................................................................................................................. 8
REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 8
ADJUSTMENT ................................................................................................................................................................. 10
SCHEMATIC DIAGRAM .................................................................................................................................................. 14
WIRING SIDE OF P.W.BOARD ....................................................................................................................................... 16
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 18
TYPES OF TRANSISTOR ............................................................................................................................................... 18
WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 19
TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 20
FUNCTION TABLE OF IC ................................................................................................................................................ 24
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (QT-CD250H FOR U.K. ONLY)
SAFETY PRECAUTION FOR SERVICE MANUAL ........................................................................................................... 2
IMPORTANT SERVICE NOTES (QT-CD250H FOR U.K. ONLY) .................................................................................... 3
VOLTAGE SELECTION (QT-CD250W ONLY) .................................................................................................................. 3
SPECIFICATIONS ............................................................................................................................................................. 3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 5
DISASSEMBLY .................................................................................................................................................................. 8
REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 8
ADJUSTMENT ................................................................................................................................................................. 10
SCHEMATIC DIAGRAM .................................................................................................................................................. 14
WIRING SIDE OF P.W.BOARD ....................................................................................................................................... 16
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 18
TYPES OF TRANSISTOR ............................................................................................................................................... 18
WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 19
TROUBLESHOOTING (CD SECTION) ........................................................................................................................... 20
FUNCTION TABLE OF IC ................................................................................................................................................ 24
PARTS GUIDE/EXPLODED VIEW
PACKING METHOD (QT-CD250H FOR U.K. ONLY)
QACCA0001SJ00
QACCB0001SJ00
QACCE0001SJZZ
QPLGA0250AFZZ
QPLGA0253AFZZ
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR (FOR QT-CD250W)
QT-CD250H/W
– 2 –
QT-CD250H for Europe
QT-CD250H for U.K.
LASER KLASSE 1
LUOKAN 1 LASERLAITE
KLASS 1 LASERAPPARAT
Precaution to be taken when replacing and servicing the Laser Pickup.
The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements.
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 AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements.
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
(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.
SAFETY PRECAUTION FOR SERVICE MANUAL
QT-CD250H for Europe
QT-CD250H for Australia/New Zealand/Philippines/QT-CD250W
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
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.
ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.
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.
VAROITUS! LAITTEEN KéYTTéMINEN
MUULLA KUIN TéSSé
KéYTTôOHJEESSA MAINITULLA
TAVALLA SAATTAA ALTISTAA
KéYTTéJéN TURVALLISUUSLUOKAN 1
YLITTéVéLLE NéKYMéTTôMéLLE
LASERSéTEILYLLE.
MUULLA KUIN TéSSé
KéYTTôOHJEESSA MAINITULLA
TAVALLA SAATTAA ALTISTAA
KéYTTéJéN TURVALLISUUSLUOKAN 1
YLITTéVéLLE NéKYMéTTôMéLLE
LASERSéTEILYLLE.
VARNING - OM APPARATEN ANVéNDS
Pè ANNAT SéTT éN I DENNA
BRUKSANVISNING SPECIFICERAS. KAN
ANVéNDAREN UTSéTTAS FôR OSYNLIG
LASERSTRèLNING, SOM ôVERSKRIDER
GRéNSEN FôR LASERKLASS 1.
Pè ANNAT SéTT éN I DENNA
BRUKSANVISNING SPECIFICERAS. KAN
ANVéNDAREN UTSéTTAS FôR OSYNLIG
LASERSTRèLNING, SOM ôVERSKRIDER
GRéNSEN FôR LASERKLASS 1.
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.
ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.
STIRRA EJ IN I STRALEN OCH BETRAKTA EJ STRALEN GENOM OPTISKT
INSTRUMENT.
ADVERSEL-USYNLIG LASERSTRALING NAR DEKSEL APNES. STIRR IKKE
INN I STRALEN ELLER SE DIREKTE MED OPTISKE INSTRUMENTER.
CAUTION
●
This Portable CD Stereo System is classified
as a CLASS 1 LASER product.
as a CLASS 1 LASER product.
●
The CLASS 1 LASER PRODUCT label is lo-
cated on the rear cover.
cated on the rear cover.
●
Use of controls, adjustments or performance of
procedures other than those specified herein
may result in hazardous radiation exposure.
procedures other than those specified herein
may result in hazardous radiation exposure.
As the laser beam used in this compact disc
player is harmful to the eyes, do not attempt to
disassemble the cabinet. Refer servicing to
qualified personnel only.
player is harmful to the eyes, do not attempt to
disassemble the cabinet. Refer servicing to
qualified personnel only.
Laser Diode Properties
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
Material: GaAIAs
Wavelength: 780 nm
Emission Duration: continuous
Laser Output: max. 0.6 mW
QT-CD250H/W
– 3 –
IMPORTANT SERVICE NOTES (QT-CD250H FOR U.K. ONLY)
PROBE
AC
OUT
UNIT
SHORT-CIRCUT
AC POWER
SUPPLY CORD
AC POWER
SUPPLY CORD
CONNECT THE PROBE
TO GND OF CHASSIS
SCREW TERMINAL
TO GND OF CHASSIS
SCREW TERMINAL
WITHSTANDING
VOLTAGE TESTER
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.
NG: The “NG” lamp lights and the buzzor sounds.
OK: The “GOOD” lamp lights.
Judgment
Unit
Set current (Cutoff current)
Set time
Set name
Withstanding Voltage Tester
Test voltage
Set value
4,240 VPEAK
3,000 VRMS
6 secs
4 mA
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
TO THE OPERATION MANUAL.
SPECIFICATIONS
Specifications for this model are subject to change without
prior notice.
prior notice.
QT-CD250H/W
VOLTAGE SELECTION (QT-CD250W ONLY)
The voltage selector is located on the AC voltage selector box. If adjustment is necessary, use a screwdriver in order to turn the
selector in either direction unitil the correct voltage figure is displayed in the window next the adjustment screw.
selector in either direction unitil the correct voltage figure is displayed in the window next the adjustment screw.
●
General
Power source:
(QT-CD250H for
U.K./Europe)
(QT-CD250H for
U.K./Europe)
AC 230-240 V, 50 Hz
DC 9 V
DC 9 V
[
"D" size (UM/SUM-1, R20
or HP-2) battery
×
6
]
DC 4.5 V
[
"AA" size (UM/SUM-3,
R6 or HP-7) battery
×
3 for backup
memory
]
Power
consumption:
(QT-CD250H)
consumption:
(QT-CD250H)
8 W
Output power:
(QT-CD250H for
Europe)
(QT-CD250H for
Europe)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, DIN 45 324)
MPO; 8.4 W (4.2 W + 4.2 W)
(AC operation, DIN 45 324)
(DC operation, DIN 45 324)
MPO; 8.4 W (4.2 W + 4.2 W)
(AC operation, DIN 45 324)
Speakers:
10 cm (4") full-range speaker
x 2
x 2
Output
terminals:
terminals:
Headphones; 16-50 ohms
(recommended; 32 ohms)
(recommended; 32 ohms)
Dimensions:
Width; 400 mm (15-3/4")
Height; 158 mm (6-1/4")
Depth; 212 mm (8-3/8")
Height; 158 mm (6-1/4")
Depth; 212 mm (8-3/8")
Weight:
2.7 kg (6.0 lbs.)
without batteries
without batteries
●
Compact disc player
Type:
Compact disc
Signal
readout:
readout:
Non-contact, 3-beam semi-
conductor laser pickup
conductor laser pickup
Audio
channels:
channels:
2
Filter:
8-times oversampling
digital filter
digital filter
D/A converter:
1-bit D/A converter
Wow and
flutter:
flutter:
Unmeasurable
(less than 0.001% W. peak)
(less than 0.001% W. peak)
●
Radio
Frequency
range:
(QT-CD250H)
range:
(QT-CD250H)
FM; 87.5 - 108 MHz
AM; 522 - 1,620 kHz
AM; 522 - 1,620 kHz
●
Tape recorder
Frequency
response:
response:
50 - 14,000 Hz
(Normal tape)
(Normal tape)
Signal/noise
ratio:
ratio:
50 dB
Wow and
flutter:
(QT-CD250H for
Europe)
flutter:
(QT-CD250H for
Europe)
0.3 % (DIN 45 511)
Motor:
DC 9 V electric governor
Bias system:
AC bias
Erase
system:
system:
Magnet erase
Power source:
(QT-CD250H for
Australia/
New Zealand/
Philippines)
(QT-CD250H for
Australia/
New Zealand/
Philippines)
●
For customers in Australia and
New Zealand;
AC 230-240 V, 50 Hz
AC 230-240 V, 50 Hz
●
For customers in Philippines;
AC 220 V, 60 Hz
DC 9 V
DC 9 V
[
"D" size (UM/SUM-1, R20
or HP-2) battery
×
6
]
DC 4.5 V
[
"AA" size (UM/SUM-3,
R6 or HP-7) battery
×
3 for backup
memory
]
Power source:
(QT-CD250W)
(QT-CD250W)
AC 110-127/220-240 V, 50/60 Hz
DC 9 V
DC 9 V
[
"D" size (UM/SUM-1, R20
or HP-2) battery
×
6
]
DC 4.5 V
[
"AA" size (UM/SUM-3,
R6 or HP-7) battery
×
3 for backup
memory
]
Power
consumption:
(QT-CD250W)
consumption:
(QT-CD250W)
10 W
Output power:
(QT-CD250H for
U.K./Australia/
New Zealand/
Philippines/
OT-CD250W)
(QT-CD250H for
U.K./Australia/
New Zealand/
Philippines/
OT-CD250W)
RMS; 4.6 W (2.3 W + 2.3 W)
(DC operation, 10 % T.H.D.)
MPO; 8.4 W (4.2 W + 4.2 W)
(AC operation, 10 % T.H.D.)
(DC operation, 10 % T.H.D.)
MPO; 8.4 W (4.2 W + 4.2 W)
(AC operation, 10 % T.H.D.)
Wow and
flutter:
(QT-CD250H for
U.K./Australia/
New Zealand/
Philippines/
QT-CD250W)
flutter:
(QT-CD250H for
U.K./Australia/
New Zealand/
Philippines/
QT-CD250W)
0.25 % (WRMS)
●
Radio
Frequency
range:
(QT-CD250W)
range:
(QT-CD250W)
FM; 88 - 108 MHz
AM; 531 - 1,602 kHz
AM; 531 - 1,602 kHz
QT-CD250H/W
– 4 –
NAMES OF PARTS
Illustration: QT-CD250W
26 27
28 29
30
VOLTAGE
SELECTOR
AC
110V - 127V
110V - 127V
AC
220V - 240V
220V - 240V
31
1
2
3 4 5
6
7
8
10
11
12
13
14
15
16
17
18
21 22 23
24
20
19
25
9
32
33
39
36
35
34
37
38
38
40
1
1.
(TAPE) Record Button
1
2.
(TAPE) Play Button
1
3.
(TAPE) Rewind Button
1
4.
(TAPE) Fast Forward Button
1
5.
(TAPE) Stop/Eject Button
1
6.
(TAPE) Pause Button
1
7.
Cassette Compartment
1
8.
CD Compartment
1
9.
CD Eject Button
10.
(CD) Stop Button
3
(TUNER) Tuning Down Button
11.
(CD) Repeat Button
3
(TUNER) Band Selector Button
12.
(TUNER) Preset Memory Button
13.
Extra Bass Button
14.
(CD) Play/Pause Button
3
(TUNER) Tuning Up Button
15.
(CD) Track Up/Cue Button
3
(TUNER) Preset Up Button
16.
(CD) Track Down/Review Button
3
(TUNER) Preset Down Button
17.
Volume Up/Down Buttons
18.
Stand-by, On/Function Switch
19.
(CD) Play Indicator
20.
(CD) Repeat Indicator
21.
(CD) Pause Indicator
22.
Extra Bass Indicator
23.
(TUNER) Memory Indicator
24.
(TUNER) FM Stereo Mode Indicator
25.
(TUNER) FM Stereo Indicator
26.
Battery Compartment
27.
FM Telescopic Rod Aerial
28.
Headphone Socket
29.
AC Power Input Socket
30.
Backup Memory Battery
32.
(CD) Play/Pause Button
3
(TUNER) Tuning Up Button
33.
(CD) Track Down/Review Button
3
(TUNER) Preset Down Button
34.
(CD) Stop Button
3
(TUNER) Tuning Down Button
35.
(CD) Repeat Button
3
(TUNER) Band Selector Button
36.
(TUNER) Memory Button
37.
(TUNER) Clear Button
38.
(CD) Track Up/Cue Button
3
(TUNER) Preset Up Button
39.
Extra Bass Button
40.
Volume Up/Down Buttons
31.
Voltage Selector (QT-CD250W Only)
Compartment
15
15
REMOTE CONTROL
Notes:
●
Replace the batteries if the operating distance is
reduced or if the operation becomes erratic.
reduced or if the operation becomes erratic.
●
Periodically clean the transmitter LED on the
remote control and the sensor on the main unit
with a soft cloth.
remote control and the sensor on the main unit
with a soft cloth.
●
Exposing the sensor on the main unit to strong
light may interfere with operation. Change the
lighting or the direction of the unit.
light may interfere with operation. Change the
lighting or the direction of the unit.
●
Keep the remote control away from moisture,
excessive heat, shock, and vibrations.
excessive heat, shock, and vibrations.
Remote sensor
0.2 m - 6 m
(8" - 20')
(8" - 20')
