Sharp QTCD-700-W Service manual
QT-CD700W
SERVICE MANUAL
PORTABLE CD STEREO SYSTEM
MIC
PAUSE
STOP/EJECT
F.FWD
PLAY/
PAUSE
DOWN/
F.REVERSE
POWER FMST
PROGRAM
PLAY
REWIND
RANDOM
RECORD
STOP
UP/
F.FORWARD
REPEAT
MODEL
QT-CD700W
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
CONTENTS
Page
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR................................................................................................ 2
SPECIFICATIONS............................................................................................................................................................ 3
NAMES OF P ARTS........................................................ ... .................................. ............................................................. 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
SHARP CORPORATION
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
QT-CD700W
SAFETY PRECAUTION FOR SERVICE MANUAL
z This product is classified as a CLASS 1 LASER PRODUCT.
z WARNINGS:
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 bee n removed, the power is turned on without a co mpact 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
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
92L26803000010
92L2680212512A
2
CHAPTER .
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
SPECIFICATIONS
QT-CD700W
■
General
QT-CD700W
Power source AC 110-127/220-240 V, 50/60 Hz
Power consumption 12 W
Output power PMPO: 32 W (AC operation, 10% T.H.D)
Speakers 77 mm (8 Ω) full range x 2
Dimensions Width: 295 mm (11-5/8")
Weight 2.1 kg (4.6 lbs) without batteries
■
Compact disc player
Typ e 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)
■
Radio
Frequency range FM:88-108MHz
DC 12 V ["C" size (UM/SUM-2, R14) battery x 8 ]
RMS: 4 W (2 W + 2 W) (DC operation, 10% T.H.D)
piezo x 2
Height: 153 mm (6")
Depth: 213 mm (8 - 3/8")
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
Specifications for this model are subject to change without prior notice.
3
Names of parts
QT-CD700W
21
20
19
18
17
16
39
1
2
45 6
7
8
10
11
12
13
14
15
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
22
23
24
26
27
25
VOLTAGE SELECTOR
110 V127V
A
BEAT CUT
220V240V
B
4
QT-CD700W
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
Main PWB
This screw fitting between
CD compartment and
tuning bracket.
Variable Capacitor
Tuning Knob
(S14)×1
φ2.6×10PH
A
(S06)×3
φ3×10PA
Dial Pointer
Tuning Bracket
Adjustment
Portion
Main PWB
Pointer
Tuning Knob
Variable Capacitor
B
Tuning Knob
5
OPERATION MANUAL
1
Preparation for use
QT-CD700W
To AC INPUT
2
Listening to a CD
1
TAPE (
S
TAN
C
DRA
FUNCTIO
D
I
O
N
AC110-127/220-240 V,
50/60 Hz
■
Turning the power
ON and setting to
■
Operation with batteries
the STAND-BY
mode
T
APE (S
T
AND
-BY
)
CD RADIO
FUNCTION
To an AC socket
● 8 "C" size batteries (UM/SUM-2, R14)
● Batteries are not included.
23 45
D-BY)
PLAY/
PAUSE
4
3
Listening to the Radio
Listening to a Cassette Tape
123 1 2 3
TAPE (STA
N
D
-BY)
CD RADIO
FUNC
T
ION
Recording from a CD
5
AM FM
TUNING
FM
ST
C
DRADIO
FUNCT
T
ION
APE (S
T
A
ND-BY)
PLAY
12 3 4 5
T
A
P
E
(
ST
A
ND
-
B
Y)
CD RAD
F
U
NCTION
I
O
RECORD
PLAY/
PAUSE
6
DISASSEMBLY
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
STEP REMOVAL
1 Rear Cabinet
2 Front Cabinet
3 Main PCB ASS'Y
4 CD Control PCB ASS'Y
5 Tape Mechanism
R/P PCB ASS'Y
6
7 CD Mechanism
8 Power PCB ASS'Y
TAPE MECHANISM
PROCEDURE FIGURE
Screw.....S08x5
Screw.....S06x2
Screw.....S06x2
Screw.....S06x4
Screw.....S06x7
Screw.....S02x1
Screw.....S15x1
Screw....S04x6
Screw....S06x4
Screw.....S06x2
Screw.....S11x4
Screw.....S02x1
R/P PCB ASS'Y
5-1
5-1
6-1
5-2
5-2
5-2
6-1
6-2
Front
Cabinet
CD Door
(S06)×2
φ3×10PA
(S08)×2
φ3×14PA
Rear
Cabinet
Figure 5-1
OPEN CASSETTE HOLDER
Figure 5-2
(S06)×2
φ3×10PA
(S06)×4
φ3×10PA
S04X6
CD CONTROL PCB ASS'Y
7
CD DOOR
TOP CABINET
QT-CD700W
FUNCTION KNOB
FUNCTION KNOB BKT
CD MECHANISM
RUBBER CUSHION X4
VOLUME KNOB
BRACKET
(S05)X1
φ3X8mm
(S11)X4
φ2.6X12PW A
MAIN PCB ASS'Y
(S15)X1
M3X8PH (BLACK)
(S14)X1
φ2.6X10PH
(S12)X1
φ3X8P A
DOOR LATCH SWITCH
BAND KNOB
BAND KNOB BKT
(S05)X1
φ3X8PWH
TUNING BRACKET
(S02)X1
φ2.6X5PH
TUNING KNOB
(S09)X2
φ3X20PWH
AC POWER
SOCKET
(S13)X2
φ3X12P A
HANDLE
TRANSFORMER
(S06)X2
φ3X10mm
AC VOLTAG E
SELECTOR COVER
S06X2
AC VOLTAGE SELECTOR
POWER PCB ASS'Y
Figure 6-2
(S03)X1
φ3X8PH
8
(S06)X7
φ3X10P A
BATTER Y DOOR
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 6-1
The wire arrangement of AC Input Socket, Voltage Selector & Power Transformer.
QT-CD700W
VOLTAGE
Screw
SELECTOR
Center Terminal
screw
Left
Terminal
1
AC INPUT
SOCKET
Black wire
To
Batterry
screw
(S13)x2 φ3x12PA
screw
(S06)x2 φ3x10PA
Right terminal
To PWB Board
(Power)
220-
240V
Left
Terminal
Red wire
2
110-127V
3
Red wire
Right Terminal
4
Blue
wire
Black wire
1
POWER
TRANSFORMER
(S09) X 2
φ3x20PWH
* Please follow the instruction of wire arrangement, to service or reinstall these critical parts.
1
BLACK WIRE
Connecting from Power Transformer (black wire) to AC Input Socket (left terminal).
2
RED WIRE
Connecting from AC Input Socket (right terminal) to Voltage Selector (center terminal).
3
RED WIRE
Connecting from Power Transformer (red wire) to Voltage Selector (left terminal).
4
BLUE WIRE
Connecting from Power Transformer (blue wire) to Voltage Selector (right terminal).
9
ADJUSTMENT
QT-CD700W
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
Tape Speed
Test Tape
MTT-111
Specified Value
Output: Speaker terminal
CN6 Load resistance: 8 ohms
Adjusting
point
Variable
Resistor in
MOTOR.
M601
Specified
3.000±90Hz
Instrument
Connection
Output: Speaker
Terminal CN6
Load resistance:
8 Ohms
TUNER SECTION
fL : Low-range frequency
fL : High-range frequency
FM IF /RF
Test Stage
FM
Band Coverage
FM Tracking
AM IF /RF
Test Stage
AM IF
AM
Band Coverage
AM Tracking
Specified Value/
Adjusting Point
fL : L301
fL : C2
fL : 90 MHz: L303
fH: 106.0 MHz: C1
Specified Value/
Adjusting Point
T303
fL: T301
fL: C4
fL: 600KHz ANT
fL: 1400KHz C3
Instrument
Connection
Input: Antenna
Output: Speaker
Terminal (CN6
Load resistance:
8 ohms
Instrument
Connection
Input: Antena
Output: Pin 18
of IC1
Input: Antenna
Output: Speaker
Terminal CN6 Load
resistance: 8 ohms
Tape Section
Position of each switch or control
Volume control
Function switch
Adjustment point
T101
Max
Tape/Stand-by
Specified Value
80KHz ± 6KHz Pin 1 CN103
Instrument
Connection
Playback Amplifier Sensitivity Check
Test Tape Specified Value Instrument Connection
MTT-118 1.5V ± 3dB
Speaker Terminal
(Load resistance: 8 ohms)
10
QT-CD700W
A
AM TRACKING
FL
FH
FM ROD ANTENNA
B
C
FM-ANT
ANT
FL
T301
AM BAR
AM ANTENNA
AM COVERAGE
FH
C4
C3
T303
AM IF
1
IC1
12
PVC1
C1
34
CN103
FH
FL
FM BAND
C2
L301
L303
24
FL FH
FM TRACKING
13 18
COVERAGE
SW4
TAPE LEAF SW
12
BIAS OSC
t101
WH
IC101
SW2
D
WH
IC201A
MOTOR
M601
E
RD
BK
TAP E
MECHANISM
Variable resistor
in motor
CN1
SW3
F
IC3
PHONE
SW1
G
VR1
H
654321
Figuer 11 ADJUSTMENT POINTS
11
QT-CD700W
CD SECTION
Since this CD system incorporates the following automatic adjustment function, when the pickup is replaced, it is not necessary tp readjust it.
Since this CD unit does not need adjustment, the combination of PWB and laser pickup unit is not restricted.
TEST MODE
Start While holding down the “Stop” and “RANDOM” button simultaneously, move the FUNCTION switch to “CD”.
Note
Operation Pressing the “UP/F.FORWARD” button will move the pickup outward.
LCD MODE
1. When the CD DOOR switch is in the OFF position, i.e. CD DOOR is opened, the unit is now in test mode. Press the “UP/
F.FORWARD” and “DOWN/F.REVERSE” buttons to move the pickup back and forth.
2. The LCD display should be the same as it is for normal CD operations.
Pressing the “DOWN/F.REVERSE” button will move the pickup inward.
Start After connecting the 10kohm resistor between IC201A 13 pin and GND, holding down the “Stop” and “RANDOM” button
Display
simultaneously and move the FUNCTION switch to “CD”.
1 ALL
PROG
RNDM
LASER LIGHTING CONFIRMATION
1. Remove the front cabinet according to the disassembly method.
2. Short the TP of the Figure 13-1 to turn on the CD DOOR switch (SW810).
3. While holding down the "Stop" and "RANDOM" button simultaneously, move the FUNCTION switch to "CD".
4. Open the CD DOOR and press the PLAY button. The laser lights up for a few seconds. (During this time, the pickup lens moves up and down and
adjusts the focus to check if there is a disc or not.)
PREPARATION FOR LASER LIGHT UP
1. Before the laser light up, CD DOOR switch (SW810) terminals have to be short with the solder. Resistor of 330ohm is put from 13 PIN of IC201A,
and you must connect it to GND of PWB. (Refer to PWB of Figure 13-1.)
12
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