SHARP WF-2000W Service Manual
WF-2000W
SERVICE MANUAL
No. S4223WF2000WS
PORTABLE STEREO COMPONENT SYSTEM
MODEL WF-2000W(S)
PORTABLE STEREO COMPONENT SYSTEM
MODEL WF-2000W(BK)
• 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
SPECIFICATIONS .............................................................................................................................................................. 2
VOLTAGE SELECTION...................................................................................................................................................... 2
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR .................................................................................................. 2
NAMES OF PARTS ............................................................................................................................................................ 3
DISASSEMBLY................................................................................................................................................................... 4
REMOVING AND REINSTALLING THE MAIN PARTS...................................................................................................... 5
ADJUSTMENT .................................................................................................................................................................... 6
FITTING OF DIAL POINTER .............................................................................................................................................. 8
NOTES ON SCHEMATIC DIAGRAM ................................................................................................................................. 8
TYPES OF TRANSISTOR AND LED.................................................................................................................................. 9
VOLTAGE ........................................................................................................................................................................... 9
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD.............................................................................................. 10
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.
WF-2000W
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
SPECIFICATIONS
General
Power source: AC 110-127 V/220-240 V,
Power consumption: 31 W
Output power:
Input terminal: Mixing microphone; 1mV/600 ohms
Output terminal: Headphones; 16-50 ohms
Dimensions: Width; 282 mm (11-1/8")
Weight: 3.5 kg (7.7 lbs.) without batter-
50/60 Hz
DC 15 V [“D” size
(UM/SUM-1, R20 or HP-2)
battery × 10]
MPO (Max.); 50 W (25 W +
25 W)
(AC operation)
RMS; 25 W (12.5 W + 12.5 W)
(DC operation, 10 % T.H.D.)
CD/LINE; 350 mV/47 kohms
(recommended; 32 ohms)
Height; 217 mm (8-9/16")
Depth; 207 mm (8-1/8")
ies
Radio section
Frequency range: FM; 88 - 108 MHz
SW1; 2.3 - 7.3 MHz
SW2; 7.3 - 22 MHz
MW; 526.5 - 1,606.5 kHz
Tape recorder section
Frequency response: 60 - 12,000 Hz (Normal tape)
Signal/noise ratio: 40 dB (TAPE 1, recording/playback)
50 dB (TAPE 2, playback)
Wow and flutter: 0.3 % (WRMS)
Motor: DC 9 V electric governor
Bias system: AC bias
Erase system: Magnet erase
Speaker section
Speakers: 9 cm (3-9/16") woofer × 1
7.5 cm (3") woofer × 1
5 cm (2") tweeter × 1
Super tweeter × 1
Maximum input power: 25 W
Rated input power: 12.5 W
Impedance: 8 ohms
Dimensions: Width; 235 mm (9-1/4")
Height; 235 mm (9-1/4")
Depth; 192 mm (7-9/16")
Weight: 2.0 kg (4.4 lbs.)/each
Specifications for this model are subject to change without
prior notice.
VOL TAGE SELECTION
Before operating the unit on mains, check the preset voltage. If the voltage is different from your local voltage, adjust the voltage
as follows. Slide the selector with a screwdriver to the appropriate voltage number. (AC 110 - 127 V or AC 220 - 240 V).
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR
QACCA0004AW00
QACCE0007AW00
QPLGA0003AWZZ
QPLGA0004AWZZ
– 2 –
NAMES OF PARTS
1.
Function Selector Switch
2.
Power Indicator
3.
Dubbing Speed/Built-in Microphone/FM Mode Switch
4.
Graphic Equalizer Controls
5.
Volume Control
6.
Extra Bass Switch (With Indicator)
7.
Fine Tuning Control
8.
Tuning Control
9.
Built-in Microphone
10.
Headphone Socket
11.
(TAPE 1) Cassette Compartment
12.
FM Stereo Indicator
13.
Band Selector Switch
14.
Mixing Microphone Socket
15.
(TAPE 2) Cassette Compartment
16.
(TAPE 1) Record Button
17.
(TAPE 1) Play Button
18.
(TAPE 1) Rewind Button
19.
(TAPE 1) Fast Forward Button
20.
(TAPE 1) Stop/Eject Button
21.
(TAPE 1) Pause Button
22.
(TAPE 2) Play Button
23.
(TAPE 2) Rewind Button
24.
(TAPE 2) Fast Forward Button
25.
(TAPE 2) Stop/Eject Button
1
245678
3
9
10
11
16 17 18 19 20 21
22 23 24 25
26 27 28
WF-2000W
12
13
14
15
29
26.
FM/SW Telescopic Rod Aerial
27.
CD/Line Input Sockets
28.
Beat Cancel Switch
29.
Speaker Terminals
30.
AC Voltage Selector
31.
AC Power Input Socket
32.
Battery Compartment
33.
Woofer
34.
Super Tweeter
35.
Tweeter
36.
Bass Reflex Duct
37.
Speaker Release Lever
38.
Speaker Wire
33
34
35
36
30
31
32
37
38
– 3 –
WF-2000W
DISASSEMBLY
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 cassette tape out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble the unit and remove
the batteries from 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.
MAIN UNIT
STEP REMOVAL PROCEDURE FIGURE
1 Front Cabinet/ 1. Screw .................. (A1) x9 4-1
Rear Cabinet 2. Socket ................. (A2) x1 4-3
3. Screw .................. (A3) x1
2 Main PWB/ 1. Knob.................... (B1) x1 4-2
Graphic Equalizer 2. Screw .................. (B2) x7
PWB/Fine Tuning 3. Socket ................. (B3) x4
PWB 4. Mic ...................... (B4) x1
3 Tape Mechanism 1. Open the cassette holder. 4-2
2. Screw .................. (C1) x5
4 Power PWB 1. Screw .................. (D1) x1 4-3
Front Cabinet
Fine Tuning PWB
(B2)x2
ø2.6x8mm
Main PWB
(C1)x5
ø3x10mm
Rear
Cabinet
(B3)x4
Graphic
Equalizer PWB
Figure 4-2
(B2)x5
ø3x8mm
Nut
Tape
Mechanism
(B1)x1
Washer
Cassette
Holder
(B4)x1
Open
SPEAKER UNIT
STEP REMOVAL PROCEDURE FIGURE
1 Woofer 1. Screw .................. (A1) x5 4-4
2. Front Panel ......... (A2) x1
3. Screw .................. (A3) x8
2 Tweeter 1. Screw .................. (B1) x2 4-4
Power
Transformer
FM Antenna
Spring
(A3)x1
ø3x6mm
MAIN UNIT SPEAKER UNIT
(A1)x1
ø3x6mm
Front
Cabinet
(A1)x3
ø3x14mm
(A1)x1
ø3x8mm
(A2)x1
(A2)x1
(D1)x1
ø3x8mm
Figure 4-3
Speaker
Release
Lever
Tweeter
(B1)x2
ø3x8mm
(A3)x4
ø3x8mm
Power PWB
Speaker Cord
Holder
Driver
Speaker
Cord
(A1)x5
ø4x16mm
(A1)x1
ø3x30mm
(A1)x2
ø3x8mm
Rear
Cabinet
Figure 4-1
(A1)x1
ø3x6mm
– 4 –
Woofer
Woofer
(A3)x4
ø3x8mm
Figure 4-4
Speaker Box
Main Unit
REMOVING AND REINSTALLING THE MAIN P ARTS
Record/Playback
Head
Erase
Head
(A1)x1
ø2x3mm
(A1)x1
ø2x7mm
Hook
(A2)x2
TAPE 1
TAPE MECHANISM SECTION
Perform steps 1, 2 and 3 of the disassembly method to
remove the tape mechanism. (See page 4.)
How to remove the record/playback and erase
heads (TAPE 1) (See Fig. 5-1)
1. When you remove the screws (A1) x 2 pcs., the recording/
playback head can be removed.
2. Move the hooks (A2) x 2 pcs., toward the center position as
shown in Fig. 5-1 and then lift the erase head.
How to remove the playback head (TAPE 2)
(See Fig. 5-2)
1. When you remove the screws (B1) x 2 pcs., the playback
head can be removed.
WF-2000W
Figure 5-1
How to remove the pinch roller (TAPE 1/2)
(See Fig. 5-3)
1. Carefully bend the pinch roller pawl in the direction of the
arrow <A>, and remove the pinch roller (C1) x 1 pc. and
(C2) x 1 pc., in the direction of the arrow <B>.
Note:
When installing the pinch roller, pay attention to the spring
mounting position.
How to remove the motor (See Fig. 5-4)
1. Remove the belt.
2. Remove the screws (D1) x 4 pcs., to remove the motor
bracket.
3. Remove the screws (D2) x 3 pcs., to remove the motor.
How to remove the belt (TAPE 1)
(See Fig. 5-5)
1. Remove the main belt (F1) x 1 pc., from the motor side.
2. Remove the FF/REW belt (F2) x 1 pc.
How to remove the belt (TAPE 2)
(See Fig. 5-5)
1. Remove the main belt (E1) x 1 pc., from the motor side.
2. Remove the FF/REW belt (E2) x 1 pc.
<B>
(B1)x1
ø2x6mm
TAPE 1
Pinch Roller
(C1)x1
Pinch Roller
Pawl
<A>
(D1)x2
ø2x4mm
(B1)x1
ø2x6mm
Figure 5-2
<B>
Figure 5-3
TAPE 2
Playback
Head
TAPE 2
Pinch Roller
(C2)x1
Pinch Roller
Pawl
<A>
(D1)x2
ø2x4mm
TAPE 2
Main
Belt
(E1)x1
REW/FF
Belt
(E2)x1
REW/FF
Clutch Ass'y
Motor
TAPE 2
Main Belt
(E1)x1
Main
Belt
(F1)x1
Figure 5-5
TAPE 1
Main Belt
(F1)x1
Motor
REW/FF
Belt
(F2)x1
TAPE 1
REW/FF
Clutch Ass'y
Motor
Motor
Bracket
(D2)x3
Special Screw
Motor
Bracket
Motor
Figure 5-4
– 5 –
WF-2000W
10 pF
1 Mohm
10 kohm
TO FREQUENCY
COUNTER
Pin 13 of IC102
Pin 21 of IC102
FET: 2SK212
(or Other 2SK Type FET.)
G
D
S
0.1 µF
ADJUSTMENT
MECHANISM SECTION
• Driving Force Check
Torque Meter
Play: TW-2412 Tape 1: Over 60 g
Specified Value
Tape 2: Over 50 g
• Torque Check
Torque Meter
Play: TW-2111 30 to 70 g.cm 27 to 60 g.cm
Fast Forward: TW-2231 Over 55 g.cm 55 to 120 g.cm
Rewind: TW-2231 Over 55 g.cm 55 to 120 g.cm
Specified Value
Tape 1 Tape 2
• Head Azimuth
Test Tape
MTT-114 Headphones Socket
Instrument Connection
(Load resistance: 32 ohms)
• Tape Speed (Normal only)
Test Tape
MTT-111 Tape 1, Tape 2: 3,000 ± 60 Hz Headphones
Adjustment
Point
VR501 Socket
Specified
Value
Instrument
Connection
(Load resistance:
32 ohms)
DECK SECTION
• Bias Oscillation
Adjustment Point Specified value Instrument
T201 100 kHz + 4 kHz Pin 5 of CON202
• Beat Cancel Switch: A
Specified Value
Beat Cancel A: 100 ± 4 kHz
B: 94 ± 4 kHz
C: 104 ± 4 kHz
Connection
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• FM IF/RF
Test Stage
FM IF T108 Input: FM Antenna
FM Detection T106
FM Band fL: L101 Input: Antenna
Coverage fH: TC1 Output: Headphones
FM Tracking fL (88.0 MHz): L102
Specified Value/
Adjusting Point
fH (108 MHz): TC2
• AM IF/RF
Test Stage
AM IF T107 Input: Antenna
MW Band fL: T103 Input: Antenna
Coverage fH: TC3 Output: Headphones
MW Tracking fL (600 kHz): L103
SW1 Band fL (2.3 MHz): T104
Coverage fH (7.3 MHz): CT102
SW1 fL (2.6 MHz): T101
Tracking fH (6 MHz): CT104
SW2 Band fL (7.3 MHz): T105
Coverage fH (22 MHz): CT101
SW2 fL (8.5 MHz): T102
Tracking fH (19 MHz): CT103
Specified Value/
Adjusting Point
fH (1,400 kHz): TC4
• VCO Frequency
Adjustment
Point
VR102 76 kHz ± 200 Hz Pin 13, Pin 21 and ground
Specified value Instrument Connection
Note:
After preparing the test circuit shown in Fig. 6, connect the Pin
13, Pin 21 and ground of the IC102 with the test circuit, and
measure the value.
Instrument
Connection
Output: Pin 9 of IC102
Socket
(Load resistance: 32 ohms)
Instrument
Connection
Output: Pin 9 of IC102
Socket
(Load resistance 32 ohms)
of IC102
• Playback Amplifier Sensitivity Check
Test tape
MTT-118 2.5 V ± 3 dB Speaker Terminal
Specified value Instrument Connection
(Load resistance: 8 ohms)
Figure 6 VCO FREQUENCY TEST CIRCUIT
– 6 –
WF-2000W
FM DET.
VCO
CT101
CT102
CT103
CT104
fH fL
SW2 BAND
COVERAGE
fH
fH
fL
fL
FM
TRACKING
SW2
TRACKING
MW
TRACKING fL
MW
TRACKING fH
fL
fH
fH
fL
SW1
TRACKING
MAIN PWB
fHfL
FM BAND
COVERAGE
MW BAND
COVERAGE fL
MW BAND
COVERAGE fH
SW1 BAND
COVERAGE
VR102
IC102
T106
T105
T103
T102
T101
T104
TC2
TC1
TC3
TC4
L102
L101
L103
T107
T108
AM IF
FM IF
13
21
9
T201
BIAS
OSC.
TAPE
SPEED
VR501
MAIN PWB
Figure 7 ADJUSTMENT POINTS
– 7 –
SW202
WF-2000W
FITTING OF DIAL POINTER
1. Remove the Main PWB, the Graphic Equalizer PWB and
the Fine Tuning PWB. (See Figure 4-2 in the "Disassembly" on page 4.)
2. Remove the dial pointer guide and PWB.
3. Insert the dial pointer from , lead it under , hang it on
the tuner gear and then pass it through .
4. Replace the Main PWB, the Graphic Equalizer PWB and
the Fine Tuning PWB.
5. Rotate the tuning knob in the arrow direction until it stops.
(Set the tuner variable capacitor to "0" point (F-LOW
state).)
6. Adjust the dial pointer so that its stopper becomes the
Figure 8-2 position. (Adjust the engagement of the pointer
gear and the tuner gear to get the minimum space between
the PWB and the stopper.) This position is the "0" point.
7. Screw up the PWB and the dial pointer guide.
A
B
C
Front Cabinet
Tuning Knob
C
Dial Pointer Guide
(256)
Make the minimum space.
B
PWB
Tuner
Gear
Fine Tuning
PWB
Screw(605)
ø3x8mm
Main PWB
Figure 8-1
"0" Point
Dial Pointer(207)
A
Dial Pointer(207)
Graphic Equalizer
PWB
PWB
NOTES ON SCHEMATIC DIAGRAM
• Resistor:
To differentiate the units of resistors, The symbol as K and
M are used: the symbol K means 1000 ohm and the symbol
M means 1000 kohm and the resistor without any symbol
is an ohm resistor. The resistor designated “Fusible” is a
fuse type resistor.
• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P means pico-farad and the unit of the capacitor
without such a symbol is microfarad. As to electrolytic
capacitor, the expression “capacitance/withstand voltage”
is used.
(CH),(RH),(UJ): Temperature compensation
(ML): Mylar type
(S): Styrol type
• The indicated voltage in each section is the one measured
by Digital Multimeter between such a section and the
chassis with no signal given.
• Schematic diagram and Wiring Side of P.W. Board for this
model are subject to change for improvement without prior
notice.
Dial Pointer
Stopper
Pointer Gear
Tuner Gear
Main PWB
Front Cabinet
Variable Capacitor
Figure 8-2
• Parts marked with “ ” ( ) are important for
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
REF. NO.
SW2 TAPE 1 PLAY ON—OFF
SW3 TAPE 1 FF/REW ON— OFF
SW4 TAPE 1 REC ON—OFF
SW5 TAPE 2 PLAY ON—OFF
SW6 TAPE 2 FF/REW ON— OFF
SW101 BAND SELECTOR SW2—SW1—MW—FM
SW202 BEAT CANCEL A—B
SW203 DUBBING SPEED/MIC/ HIGH—NORMAL—MIC/
SW401 X-BASS ON—OFF
SW501 FUNCTION SELECTOR CD/LINE—RADIO—
SW601 VOLTAGE SELECTOR
DESCRIPTION POSITION
FM MODE
FM STEREO—FM MONO
TAPE/STAND-BY—ON
110-127 V—220-240 V
– 8 –
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