Sharp QT-CD700W User manual

QT-CD700W
QT-CD700W
SERVICE MANUAL
SHARP CORPORATION
CONTENTS
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
MODEL
PORTABLE CD STEREO SYSTEM
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
PAUSE STOP/EJECT
STOP
F.FWD
UP/
F.FORWARD
REWIND PLAY RECORD
REPEAT
PLAY/
PAUSE
MIC
DOWN/
F.REVERSE
PROGRAM
POWER FM ST
RANDOM
Page
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR................................................................................................ 2
SPECIFICATIONS............................................................................................................................................................ 3
NAMES OF PARTS.......................................................................................................................................................... 4
FITTING OF DIAL POINTER ........................................................................................................................................... 5
OPERATION MANUAL..................................................................................................................................................... 6
DISASSEMBLY................................................................................................................................................................. 7
ADJUSTMENT................................................................................................................................................................. 10
NOTES ON SCHEMATIC DIAGRAM.............................................................................................................................. 15
WAVEFORMS OF CD CIRCUITS ................................................................................................................................... 22
TROUBLESHOOTING (CD SECTION)...........................................................................................................................24
FUNCTION TABLE OF IC ...............................................................................................................................................29
PARTS GUIDE/EXPLODED VIEW

QT-CD700W
2
SAFETY PRECAUTION FOR SERVICE MANUAL
zThis product is classified as a CLASS 1 LASER PRODUCT.
zWARNINGS:
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. So 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 adjustment, or performance of procedures other than those specified
herein may result in hazardous radiation exposure.
92L24801600292
92L24801800222
92L2680212512A
92L26803000010
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR

QT-CD700W
3
CHAPTER .
QT-CD700W
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
■General
SPECIFICATIONS
Power source AC 110-127/220-240 V, 50/60 Hz
DC 12 V ["C" size (UM/SUM-2, R14) battery x 8 ]
Power consumption 12 W
Output power PMPO: 32 W (AC operation, 10% T.H.D)
RMS: 4 W (2 W + 2 W) (DC operation, 10% T.H.D)
Speakers 77 mm (8 Ω) full range x 2
piezo x 2
Dimensions Width: 295 mm (11-5/8")
Height: 153 mm (6")
Depth: 213 mm (8 - 3/8")
Weight 2.1 kg (4.6 lbs) without batteries
■Radio
Frequency range FM:88-108MHz
AM: 526.5 - 1,606.5 kHz
■Tape recorder
Frequency response 60 - 12,000 Hz (Normal tape)
Signal/noise ratio 40 dB
Wow and flutter 0.3% (WRMS)
Motor DC 9 V electric governor
Bias system AC bias
Erase system Magnet erase
■Compact disc player
Type Compact disc
Signal readout Non-contact, 3-beam semiconductor laser pickup
Audio channels 2
Filter 8 time over sampling digital filter
D/A converter 1-bit D/A converter
Wow and flutter Unmeasurable (less than 0.001% W. peak)
Specifications for this model are subject to change without prior notice.

QT-CD700W
4
Names of parts
1
16
17
18
19
20
21
239
10
11
12
13
14
45 678
15
22
1. Function Switch
2. Volume Control
3. (Tape) Pause Button
4. (Tape) Stop/Eject Button
5. (Tape) F.Forward Button
6. (Tape) Rewind Button
7. (Tape) Play Button
8. (Tape) Record Button
9. CD Compartment
10. Tuning Control
11. Band Selector
12. (CD) Random Button
13. (CD) Stop Button
14. (CD) Track Up/F.Forward Button
15. (CD) Repeat Button
16. Cassette Compartment
17. LCD Display
18. (CD) Program Button
19. (CD) Track Down/F.Reverse Button
20. (CD) Play/Pause Button
21. Built In Microphone
22. FM Aerial
23. Battery Compartment
24. Earphone socket
25. AC Voltage Selector
26. AC Input Socket
27. Beat Cut Switch
23
24
25
26
27
A
BEAT CUT
B
110V-
127V
VOLTAGE SELECTOR
220V-
240V

QT-CD700W
5
FITTING OF DIAL POINTER
Setting method of dial pointer
1) Remove the front cabinet.
2) Remove 3 pcs screws (S06) φ3 x 10 PA from tuning bracket (bottom of PWB board/pattern side), and remove 1 pc screw (S14) φ2.6 x 10 PH from
tuning bracket/CD compartment’s flange (with fitting between CD compartment and tuning bracket).
3) Remove dial pointer.
4) Insert dial pointer from A direction to tuning bracket, then engages the dial pointer’s guide hook into tuning control’s slot properly B. (Ensure
tuning control’s pin located on adjustment portion of tuning bracket.)
5) Reassemble the screws and front cabinet.
Dial Pointer
Dial Pointer
Main PWB
Main PWB
Variable Capacitor Variable Capacitor
Tuning Knob
A
Tuning Knob
Tuning Knob
Tuning Bracket
Adjustment
Portion
Pointer
(S06)×3
φ3×10PA
(S14)×1
φ2.6×10PH
This screw fitting between
CD compartment and
tuning bracket.
B

QT-CD700W
6
OPERATION MANUAL
1Preparation for use
2 Listening to a CD
4 Listening to a Cassette Tape
3 Listening to the Radio
5
Recording from a CD
■
● 8 "C" size batteries (UM/SUM-2, R14)
● Batteries are not included.
Turning the power
ON and setting to
the STAND-BY
mode
■
Operation with batteries
1
123 1 2 3
23 45
12 3 4 5
PLAY/
PAUSE
AC110-127/220-240 V,
50/60 Hz
To an AC socket
To AC INPUT
FUNCTION
TAPE (STAND-BY)
CD RADIO
FUNCTION
TAPE (STAND-BY)
CDRA
DIO
FUNCTION
TAPE (STAND-BY)
CD RADIO
AM FM FM ST
FUNCTION
TAPE (STAND-BY)
CDRADIO
FUNCTION
TAPE(STAND-BY)
CD RADIO
PLAY/
PAUSE
PLAY
RECORD
TUNING

QT-CD700W
7
DISASSEMBLY
Screw....S04x6
5 Tape Mechanism Screw....S06x4
1 Rear Cabinet Screw.....S08x5
Screw.....S06x2
Screw.....S06x2
Screw.....S06x4
2 Front Cabinet
3 Main PCB ASS'Y
Screw.....S06x7
Screw.....S02x1
Screw.....S15x1
4 CD Control PCB ASS'Y
R/P PCB ASS'Y Screw.....S06x2
7 CD Mechanism Screw.....S11x4
Figure 5-2
Figure 5-1
8 Power PCB ASS'Y Screw.....S02x1
6
5-2
5-1
5-1
6-1
5-2
6-1
6-2
5-2
STEP REMOVAL PROCEDURE FIGURE
CD Door
Front
Cabinet
Rear
Cabinet
(S06)×2
φ3×10PA
(S08)×2
φ3×14PA
R/P PCB ASS'Y
(S06)×2
φ3×10PA
(S06)×4
φ3×10PA
TAPE MECHANISM
S04X6
CD CONTROL PCB ASS'Y
OPEN CASSETTE HOLDER
Caution On Disassembly
Follow the below-mentioned notes when disassembling the unit and reassembling, to keep it safe and
ensure excellent performance:
1. Take cassette tape and compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.
3. Take 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 integraged circuits and other circuits when servicing.

QT-CD700W
8
Figure 6-1
Figure 6-2
FUNCTION KNOB
FUNCTION KNOB BKT
(S05)X1
φ3X8mm
(S05)X1
φ3X8PWH
CD MECHANISM
MAIN PCB ASS'Y
POWER PCB ASS'Y
BATTERY DOOR
TOP CABINET
CD DOOR
(S12)X1
φ3X8PA
(S14)X1
φ2.6X10PH
BAND KNOB
BAND KNOB BKT
DOOR LATCH SWITCH
TUNING BRACKET
(S02)X1
φ2.6X5PH
TUNING KNOB
(S06)X7
φ3X10PA
RUBBER CUSHION X4
VOLUME KNOB
BRACKET
(S15)X1
M3X8PH (BLACK)
(S11)X4
φ2.6X12PWA
(S03)X1
φ3X8PH
HANDLE
TRANSFORMER
(S09)X2
φ3X20PWH
AC POWER
SOCKET (S06)X2
φ3X10mm
(S13)X2
φ3X12PA S06X2
AC VOLTAGE
SELECTOR COVER
AC VOLTAGE SELECTOR
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.

QT-CD700W
9
(S09) X 2
φ3x20PWH
Black wire
Bluewire
Red wire
Red wire
Left
Terminal
Left
Terminal
Right Terminal
Center Terminal
Screw
VOLTAGE
SELECTOR
220-
240V
110-127V
POWER
TRANSFORMER
screw
(S06)x2 φ3x10PA
Right terminal
To
Batterry
AC INPUT
SOCKET
screw
Black wire
To PWB Board
(Power)
screw
(S13)x2 φ3x12PA
The wire arrangement of AC Input Socket, Voltage Selector & Power Transformer.
* Please follow the instruction of wire arrangement, to service or reinstall these critical parts.
1
1
2
3
4
1
BLACK WIRE
Connecting from Power Transformer (black wire) to AC Input Socket (left terminal).
2RED WIRE
Connecting from AC Input Socket (right terminal) to Voltage Selector (center terminal).
3RED WIRE
Connecting from Power Transformer (red wire) to Voltage Selector (left terminal).
4BLUE WIRE
Connecting from Power Transformer (blue wire) to Voltage Selector (right terminal).

QT-CD700W
10
ADJUSTMENT
MECHANISM SECTION
Torque Specified Value
Play: TW-2412 Over: 80g
Torque Check
Torque Meter Specified Value
Play TW-2111 30 to 60g.cm
Fast Forward 55 to 140g.cm
Rewing: TW-2231 55 to 140g.cm
Head Azimuth
Torque
MT-114
Specified Value
Output: Speaker terminal
CN6 Load resistance: 8 ohms
Tape Speed
Test Tape
MTT-111
Adjusting
point Specified
Variable
Resistor in
MOTOR.
M601
3.000±90Hz
Instrument
Connection
Output: Speaker
Terminal CN6
Load resistance:
8 Ohms
Tape Section
Position of each switch or control
Volume control
Function switch
Max
Tape/Stand-by
Adjustment point
T101
Specified Value Instrument
Connection
80KHz ± 6KHz Pin 1 CN103
TUNER SECTION
fL : Low-range frequency
fL : High-range frequency
FM IF /RF
Test Stage Specified Value/
Adjusting Point
Specified Value/
Adjusting Point
Instrument
Connection
FM
Band Coverage
fL : L301
fL : C2
FM Tracking fL : 90 MHz: L303
fH: 106.0 MHz: C1
AM IF /RF
Test Stage
AM IF
AM
Band Coverage
AM Tracking
Instrument
Connection
T303
Input: Antena
Output: Pin 18
of IC1
fL: T301
fL: C4
fL: 600KHz ANT
fL: 1400KHz C3
Input: Antenna
Output: Speaker
Terminal CN6 Load
resistance: 8 ohms
Playback Amplifier Sensitivity Check
Test Tape Specified Value Instrument Connection
MTT-118 1.5V ± 3dB Speaker Terminal
(Load resistance: 8 ohms)
Input: Antenna
Output: Speaker
Terminal (CN6
Load resistance:
8 ohms