Sony WF 930Z Service Manual

SERVICE MANUAL

WF-930Z(BK)

WF-930Z

No. S5630WF930Z//

• 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 PLUG............................................................................................................................2

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

FITTING OF DIAL POINTER ...............................................................................................................................................3

DISASSEMBLY ....................................................................................................................................................................4

REMOVING AND REINSTALLING THE MAIN PARTS .......................................................................................................5

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

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

NOTES ON SCHEMATIC DIAGRAM.................................................................................................................................12

TYPES OF TRANSISTOR AND LED .................................................................................................................................12

REPLACEMENT PARTS LIST / EXPLODED VIEW

SHARP CORPORATION

WF-930Z

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.

SPECIFICATIONS

I

General

Power source: AC 110 - 127/220 - 240 V, 50/60 Hz

DC 12 V ["D" size (UM/SUM - 1, R20 or
HP - 2) battery x 8]

Power consumption: 30 W
Output power: PMPO; 60 W (30 W + 30 W)

(AC operation)
MPO (Max.); 20 W (10 W + 10 W)
(AC operation)
RMS; 10 W (5 W + 5 W)
(DC operation, 10 % T.H.D.)

Input terminal: Mixing microphone; 600 ohms
Output terminal: Headphones; 16 -50 ohms

(recommended; 32 ohms)

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

Height; 217 mm (8 - 9/16")
Depth; 186 mm (7 - 3/8")

Weight: 2.9 kg (6.4 Ibs.) without batteries

I

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

I

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 12 V electric governor
Bias system: AC bias
Erase system: Magnet erase

I

Speaker section

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

woofer x 2
Tweeter x 2

Maximum input
power: 10 W
Impedance: 3 ohms
Dimensions: Width; 195 mm (7 - 11/16")

Height; 217 mm (8 - 9/16")
Depth; 189 mm (7 - 1/2")

Weight: 1.2 kg (2.6 Ibs.)/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 PLUG

9FGS9822020300

9FGS9821620000

9FGS9822020500

QPLGA0250AFZZ

QPLGA0253AFZZ

9FGS9822020400

– 2 –

1. Extra Bass Control: X-BASS

2. Graphic Equalizer Controls

3. FM Stereo Indicator

4. Power Indicator

5. Function Selector Switch

6. Volume Control

7. Dubbing Speed/Built-in Microphone Switch

8. Built-in Microphone

9. Tuning Control

10. Fine Tuning Control

11. Band Selector Switch

12. Headphones Socket

13. Mixing Microphone Socket

14. FM Mode Switch

15. (TAPE 1) Cassette Compartment

16. (TAPE 1) Record Button: I

17. (TAPE 1) Play Button: 0

18. (TAPE 1) Rewind Button: 3

19. (TAPE 1) Fast Forward Button: 2

20. (TAPE 1) Stop/Eject Button: ■ 7

21. (TAPE 1) Pause Button: 6

22. (TAPE 2) Play Button: 0

23. (TAPE 2) Rewind Button: 3

24. (TAPE 2) Fast Forward Button: 2

25. (TAPE 2) Stop/Eject Button: ■ 7

26. (TAPE 2) Cassette Compartment

27. CD/Line Input Sockets

28. Beat Cancel Switch

29. FM/SW Telescopic Rod Aerial

30. Speaker Terminals

31. AC Voltage Selector

32. AC Power Input Socket

33. Battery Compartment

34. Tweeter

35. Woofer

36. Speaker Release Lever

37. Speaker Wire

0

3

0

3

NAMES OF PARTS

2

1

12

13
14
15

16

17181920

3

4

56

21

789

23 24 25

22

TAPE 1 TAPE 2

27

28 29

30

34

35

WF-930Z

10
11

26

31
32

33

36

37

FITTING OF DIAL POINTER

1. Remove the main PWB. Attach the dial pointer as shown arrow

 on the front cabinet, putting it into the section indicated by arrow
È. Insert it between the arrows Ê.

2. Install the main PWB in the front cabinet and secure it with the two
screws.

3. Turn the dial drum in the direction indicated by arrow Ë. Set the
dial pointer to point "0", and then make the rest of the adjustments.

Front
Cabinet

Tape
Mechanism

C

Dial Pointer (203)

''0''Point

Dial Pointer (203)

B

Screw(601)
ø2 x4mm

Figure 3

A

Dial Drum (213)

D

Screw(606)
ø3 x8mm

Main PWB

– 3 –

WF-930Z

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 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

Rear Cabinet Lid ...................(A1)x1 4-1

2. Screw ................(A2)x4

3. Screw ................(A3)x1

4. Screw ................(A4)x1

5. Screw ................(A5)x3

6. Socket ...............(A6)x1

7. Tip .....................(A7)x1

2 Main PWB/ 1. Knob .................(B1)x1 4-2

Volume PWB 2. Socket ...............(B2)x5

3. Screw ................(B3)x1

4. Screw ................(B4)x1

3 Graphic Equalizer 1. Screw ................(C1)x4 4-2

PWB

4 LED PWB 1. Screw ................(D1)x2 4-2

5 Tape Mechanism 1. Open the cassette holder 4-2

2. Screw ................(E1)x5

6 Power PWB 1. Screw ................(F1)x1 4-3

2. Bracket..............(F2)x1

SPEAKER

STEP REMOVAL PROCEDURE FIGURE

1 Front Panel 1. Screw ................(G1)x4 4-4

2 Woofer 1. Screw ................(G2)x4 4-4

(A2) x2
ø3 x10mm

(A3) x1
ø3 x14mm

(A1) x1

(B4) x1
ø2 x4mm

(B3) x1
ø3 x8mm

(E1) x5
ø3x 8mm

(A4) x1
ø3 x28mm

Front Cabinet

(B2) x5

(A5) x3
ø3 x8mm

Figure 4-1

Main
PWB

Figure 4-2

Rear
Cabinet

Washer
Volume
PWB

(A6) x1

Nat

(D1)x2
ø3x8mm

LED PWB

Tape
Mechanism

Main
PWB

(A7) x1

Front
Cabinet

(A2) x2
ø3 x10mm

Main
PWB

Front
Cabinet

(B1) x1

Graphic
Equalizer
PWB

Open

Cassette
Holder
(Left/Right)

(C1) x4
ø3x8mm

Tweeter

Woofer

Speaker Cord
Holder

Front Panel

(G2) x4
ø3x 8mm

Speaker Box

Figure 4-4

Speaker
Cord

Driver

(G1) x4
ø3 x14mm

UNIT

– 4 –

Power
Transeformer

(F1) x1
ø3 x8mm

Rear Cabinet

Power PWB

(F2) x1

Figure 4-3

REMOVING AND REINSTALLING THE MAIN PARTS

TAPE MECHANISM SECTION

Perform steps 1, 2 and 5 of the disassembly method to remove
the tape mechanism. (See page 4.)

How to remove the record / playback, playback
and erase heads (See Fig. 5-1 and 5-2.)

1. Remove the screws (A1) x 2 pcs., to remove the record/
playback head.

2. Remove the hooks (A2) x 2 pcs., toward the center position

as shown in Fig. 5-1. and then extract the erase head upward.

3. Remove the screws (B1) x 2 pcs., to remove the playback
head.

Note:

After replacing the heads and performing the azimuth adjust­ment, be sure to apply screwlock.

How to remove the pinch roller (See Fig. 5-3.)

1. Carefully bend the pinch roller pawl in the direction of the

arrow Â, and remove the pinch roller (C1) upwards.

How to remove the motor (See Fig. 5-4.)

1. Remove the belt.

2. Remove the screws (D1) x 6 pcs., to remove the motor

bracket.

3. Remove the screws (D2) x 3 pcs., to remove the motor.

Note:

When mounting the motor, pay attention to the motor mounting
angle.

Hook
(A2) x2

Erase
Head

(B1) x1
ø2x7mm

(A1) x1
ø2x7mm

(A1) x1
ø2x3mm

Figure 5-1

(B1) x1
ø2x3mm

WF-930Z

TAPE 1

Record/Playback
Head

TAPE 2

Playback
Head

How to remove the belts (See Fig. 5-5.)

1. Remove the main belt (E1) x 1 pc., at the tape 1 side from the

motor pulley.

2. Remove the main belt (E2) x 1 pc., at the tape 2 side from the

motor pulley.

3. Remove the REW/FF belt (E3) x 2 pcs., from the REW/FF

roller.

4. Put on the belts in the reverse order of removal.

Note:

When putting on the belt, ascertain that the belt is not twisted,
and clean it.

Moter

TAPE 2

Frywheel

REW / FF
Clutch Ass'y

REW / FF
Belt
(E3) x1

TAPE 2
Main Bert

Main
Belt
(E2) x1

TAPE 1
Main Bert

Moter
Main

Belt
(E1) x1

TAPE 1

REW / FF
Clutch Ass'y

(D1) x2
ø2 x4mm

Pinch Roller
(C1)

(D1) x2
ø2 x4mm

Figure 5-2

Figure 5-3

Motor
Bracket

Pinch Roller
Pawl

A

(D1) x2
ø2 x4mm

(D2) x3
Special Screw

Frywheel

Figure 5-5

REW / FF
Belt
(E3) x1

– 5 –

Motor

Figure 5-4

Motor
Bracket

WF-930Z

ADJUSTMENT

MECHANISM SECTION

• Driving Force Check

Torque Meter

Play: TW-2412 Tape 1: Over 50g

• Torque Check

Torque Meter

Play: TW-2111 30 to 60 g.cm 30 to 60 g.cm
Fast forward: TW-2231 55 to 120 g.cm 80 to 135 g.cm
Rewind: TW-2231 55 to 120 g.cm 80 to 135 g.cm

• Head Azimuth

Test Tape

MTT-114 Headphones Socket

• Tape Speed (Normal only)

Test Tape

MTT-111 Tape 1,2: VR501 3,000 ± 60 Hz Headphones

Adjusting

Point

Specified Value

Tape 2: Over 60 g

Specified Value

Tape 1 Tape 2

Instrument Connection

(Load resistance: 32 ohms)

Specified

Value

Instrument

Connection

socket(Load
resistance:

32 ohms)

TUNER SECTION

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

• AM IF/RF

Specified

Test Stage

IF T3 Input: Antenna

MW Band fL: L6
Coverage fH: TC8

MW Tracking fL (600 kHz):

SW1 Band fL: L7
Coverage fH: TC4

SW1 Tracking fL (2.6 MHz):

SW2 Band fL: L8
Coverage fH: TC3

SW2 Tracking fL (8.5 MHz): L5

Value/Adjusting

Point

L3 (MW)
fH (1,400 kHz):
TC7

L4 (SW1)
fH (6.0 MHz):
TC2

fH (19 MHz): TC1

Instrument

Connection

Output: Pin 3 of IC2

TAPE SECTION

Position of each switch or control

Volume control Max
Beat cancel A
Function/Power Tape/Stand-by
Dubbing speed/Built-in Microphone OFF/Mic ON

• Bias Oscillation Frequency

Specified Value

Beat cancel A: 100 ± 4 kHz

• Playback Amplifier Sensitivity Check

Test Tape

MTT-118 1.3 V ± 3 dB Speaker terminal

Specified Value

B: 94 ± 4 kHz
C: 104 ± 4 kHz

Instrument Connection

(Load resistance: 3 ohms)

• FM IF/RF

Specified

Test Stage

IF T1
Detection T2
Band Coverage fL: L2

Tracking fL (88.0 MHz):

Value/Adjusting

Point

fH: TC6

L1
fH (108.0 MHz):
TC5

Instrument

Connection

Input: Antenna
Output: Pin 1 of IC1

• VCO Frequency

Specified ValueTest Stage

VR1 76 kHz ± 200 Hz Pin 13 of IC2

Instrument

Connection

– 6 –