SHARP WF-1000W Service Manual

WF-1000W

SERVICE MANUAL

No. S0957WF1000WK

WF-1000W(BK)
WF-1000W(S)

• 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.

CONTENTS

Page

SPECIFICATIONS ...............................................................................................................................................................2

VOLTAGE SELECTION.......................................................................................................................................................2

AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................... 2

NAMES OF PARTS ............................................................................................................................................................. 3

FITTING OF DIAL POINTER ...............................................................................................................................................4

DISASSEMBLY....................................................................................................................................................................5

ADJUSTMENT .....................................................................................................................................................................6

NOTES ON SCHEMATIC DIAGRAM .................................................................................................................................. 7

TYPES OF TRANSISTOR AND LED...................................................................................................................................7

SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD.................................................................................................8

PARTS GUIDE / EXPLODED VIEW

SHARP CORPORATION

– 1 –

This document has been published to be used
for after sales service only.
The contents are subject to change without notice.

WF-1000W

g

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,

50/60 Hz
DC 15 V ["D" size
(UM/SUM-1, R20 or HP-2)
battery × 10]

Power
consumption: 28 W
Output power: PMPO; 200 W (total)

(AC operation)
MPO; 50 W (25 W + 25 W)
(AC operation, 10 % T.H.D.)
RMS; 25 W (12.5 W + 12.5
W)
(DC operation, 10 % T.H.D.)

Input terminal: Mixing microphone;

600 ohms
CD/LINE; 350 mV/47 kohms

Output terminal: Headphones; 16-50 ohms

(recommended; 32 ohms)

Dimensions: Width; 300 mm (11-13/16")

Height; 240 mm (9-1/2")
Depth; 220 mm (8-11/16")

Weight: 3.8 kg (8.4 lbs.) without bat-

teries

● 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)

55 dB (TAPE 2, playback)

Wow and flutter: 0.15 % (WRMS)
Motor: DC 9 V electric governor
Bias system: AC bias
Erase system: Magnet erase

● Speaker section

Type: 2-way type
Speakers: 12 cm (4-3/4") free-edge speaker × 2

Tweeter × 2

Impedance: 8 ohms
Dimensions: Width; 235 mm (9-1/4")

Height; 262 mm (10-5/16")
Depth; 220 mm (8-11/16")

Wei

ht: 1.8 kg (4.0 lbs.)/each

Specifications for this model are subject to change without
prior notice.

VOLTAGE 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 AC power supply socket to the visible indication of the side of your local voltage.

AC POWER SUPPLY CORD AND AC PLUG ADAPTOR

QACCE0007AW00

QACCA0001SJ00

QPLGA0253AFZZ

– 2 –

NAMES OF PARTS

11.

Graphic Equalizer Controls

12.

Power Indicator

13.

Volume Control

14.

FM Stereo Indicator

15.

Fine Tuning Control

16.

Built-in Microphone

17.

Mixing Microphone Socket

18.

Headphone Socket

19.

Function Selector Switch

10.

(TAPE 1) Cassette Compartment

11.

Tuning Control

12.

Extra Bass Switch

13.

Band Selector Switch

14.

Dubbing Speed/Built-in Microphone/FM Mode Switch

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

6

7
8
9

10

16

17

12 4 5

18

3

21

2019

22

2423

WF-1000W

11
12

13
14

15

25

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.

Tweeter

34.

Bass Reflex Duct

35.

Woofer

36.

Speaker Release Lever

37.

Speaker Wire

26

27 28

33

34
35

29
30

31

32

36

37

– 3 –

WF-1000W

Tuner Gear

Stopper

Main PWB

Variable Capacitor

Dial Pointer

PWB

Make the minimum space.

Front Cabinet

Pointer Gear

FITTING OF DIAL POINTER

1. Remove the Main PWB, the Graphic Equalizer PWB, the
Volume PWB and the Fine Tuning PWB. (See Figure 5-2
in the "Disassembly" on page 5.)

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 .

A

B

C

4. Replace the Main PWB, the Graphic Equalizer PWB, the
Volume 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 4-2 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.

Front Cabinet

Tuning Knob

C

Dial Pointer Guide
(218)

Dial Pointer(211)

B

PWB

Tuner
Gear

"0" Point

Fine Tuning
PWB

Screw(601)
ø3x10mm

Main PWB

Figure 4-1

A

Dial Pointer(211)

Graphic Equalizer
PWB

Volume PWB

Figure 4-2

– 4 –

DISASSEMBLY

Rear Cabinet

(D1)x3
ø3x10mm

(D2)x2
ø4x16mm

(D4)x2
ø3x10mm

Power
Transformer

Voltage Selector

AC Socket

(D3)x1

Power
PWB

Terminal B
PWB

Terminal A
PWB

(D5)x2

(E3)x4
ø3x10mm

(E1)x5
ø4x16mm

Speaker Box

Main Unit

Speaker
Release
Lever

Speaker Cord
Holder

Speaker
Cord

Driver

Woofer

Tweeter

Front Panel
(E2)x1

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. Battery Compartment Lid. 5-1

Rear Cabinet ................................. (A1)x1

2. Screw ................... (A2)x3

3. Screw ................... (A3)x4

4. Socket .................. (A4)x1

2 Main PWB/ 1. Knob.....................(B1)x1 5-2

Graphic Equalizer 2. Socket .................. (B2)x3

PWB/ 3. Screw................... (B3)x5

Volume PWB/ 4. Screw ................... (B4)x2

Fine Tuning PWB 5. Mic ....................... (B5)x1

3 Tape mechanism 1. Open the cassette holder. 5-2

2. Screw ................... (C1)x6

4 Power PWB/ 1. Screw ................... (D1)x3 5-3

Terminal A PWB/ 2. Screw ................... (D2)x2

Terminal B PWB 3. Bracket.................(D3)x1

4. Screw ................... (D4)x2

5. Hook.....................(D5)x2

Front Cabinet

Main PWB

(B4)x2
ø3x10mm

(C1)x4
ø3x10mm

Fine Tuning PWB

(B3)x5
ø3x10mm

(B2)x3

Volume
PWB

Figure 5-2

Graphic
Equalizer PWB

Washer

(B5)x1

(C1)x2
ø3x10mm

WF-1000W

(B1)x1

Nat

Open

Cassette
Holder
(Left/Right)

Tape
Mechanism

SPEAKER UNIT

STEP REMOVAL PROCEDURE FIGURE

1 Speaker 1. Screw ................... (E1)x5 5-4

2. Front Panel .......... (E2)x1

3. Screw ................... (E3)x4

Main PWB

(A2)x1

ø3x6mm

(A3)x4

ø3x20mm

(A2)x1

ø3x10mm

(A1)x1

Cabinet

Rear

(A4)x1

(A2)x1

ø3x6mm

Figure 5-1

Figure 5-3

Front

Cabinet

Figure 5-4

– 5 –

WF-1000W

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter

Play: TW-2412 Tape 1: Over 60 g

Specified Value

Tape 2: Over 60 g

• Torque Check

Torque Meter

Play: TW-2111 30 to 70 g.cm 30 to 70 g.cm
Fast Forward: TW-2231 Over 55 g.cm Over 55 g.cm
Rewind: TW-2231 Over 55 g.cm Over 55 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 1,2:VR102 3,000 ± 60 Hz Headphones

Adjustment

Point

Specified

Value

Instrument

Connection

Socket
(Loadresistance:

32 ohms)

DECK SECTION

• Bias Oscillation

• Beat Cancel Switch: C

Adjustment Point Specified value Instrument

L301 100 kHz + 4 kHz Pin 1 of CNS102

Specified Value

Beat Cancel A: 104 ± 4 kHz

B: 94 ± 4 kHz
C: 100 ± 4 kHz

• Playback Amplifier Sensitivity Check

Test tape

MTT-118 2.5 V ± 3 dB Speaker terminal

Specified value Instrument Connection

(Load resistance: 8 ohms)

Connection

TUNER SECTION

fL: Low-range frequency
fH: High-renge frequency

• FM IF/RF

Test Stage

FM IF L9 Input: FM Antenna
FM Detection L10 Output:Pin 9 of IC2

FM Band fL: L1 Input: Antenna
Coverage fH: TC1 Output: Headphone Socket
FM Tracking fL(88.0 MHz): L2 (Load resistance:

Specified Value/

Adjusting

Point

fH(108 MHz): TC2 32 ohms)

• AM IF/RF

Test Stage

AM IF L11

MW Band fL: L6
Coverage fH: TC3

MW Tracking fL(600 kHz): L3

SW1 Band fL(2.3 MHz): L7
Coverage fH(7.3 MHz): TC5

SW1 fL(2.6 MHz): L4
Tracking fH(6 MHz): TC6

SW2 Band fL(7.3 MHz): L8
Coverage fH(22 MHz): TC7

SW2 fL(8.5 MHz): L5
Tracking fH(19 MHz): TC8

Specified Value/

Adjusting

Point

fH(1,400 kHz):TC4

• VCO Frequency

Adjustment

Point

VR1 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 IC2 with the test circuit, and
measure the value.

Pin 13 of IC2

10 pF

1M ohm

Pin 21 of IC2

G

D

FET: 2SK212
(or Other 2SK Type FET.)

S

0.1 µF

10K ohm

Instrument

Connection

Instrument

Connection

Input: Antenna
Output: Pin 9 of IC2

Input: Antenna

Output: Headphone Socket

(Load resistance
32 ohms)

of IC2

TO FREQUENCY
COUNTER

– 6 –

Figure 6 VCO FREQUENCY TEST CIRCUIT