Sharp WF-930Z(BK) Service Manual

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 WF-930Z(BK) CONTENTS 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.

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 FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. – 2 – 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 QPLGA0250AFZZ 9FGS9822020400 9FGS9822020500 9FGS9821620000 9FGS9822020300 QPLGA0253AFZZ

– 3 – Figure 3 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. 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 0 18. (TAPE 1) Rewind Button: 3 3 19. (TAPE 1) Fast Forward Button: 2 20. (TAPE 1) Stop/Eject Button: I 7 21. (TAPE 1) Pause Button: 6 22. (TAPE 2) Play Button: 0 0 23. (TAPE 2) Rewind Button: 3 3 24. (TAPE 2) Fast Forward Button: 2 25. (TAPE 2) Stop/Eject Button: I 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 Dial Pointer (203) Dial Pointer (203) Front Cabinet ''0''Point Dial Drum (213) Screw(606) ø3 x8mm Screw(601) ø2 x4mm Main PWB Tape Mechanism C B D A FITTING OF DIAL POINTER 27 28 29 30 31 32 33 34 35 36 37 TAPE 1 TAPE 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 171819 2021 22 23 24 25 26

Figure 4-1 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. 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 STEP REMOVAL PROCEDURE FIGURE 1 Front Panel 1. Screw ................(G1)x4 4-4 2 Woofer 1. Screw ................(G2)x4 4-4 Figure 4-4 Figure 4-3 Figure 4-2 Front Cabinet Main PWB Volume PWB Tape Mechanism Washer Nat (B1) x1 (D1)x2 ø3x8mm (B4) x1 ø2 x4mm (E1) x5 ø3x 8mm (C1) x4 ø3x8mm (B3) x1 ø3 x8mm (B2) x5 LED PWB Graphic Equalizer PWB Open Cassette Holder (Left/Right) Front Cabinet Front Cabinet Rear Cabinet (A2) x2 ø3 x10mm (A2) x2 ø3 x10mm (A3) x1 ø3 x14mm (A4) x1 ø3 x28mm (A5) x3 ø3 x8mm (A7) x1 (A6) x1 Main PWB Main PWB (A1) x1 (G2) x4 ø3x 8mm (G1) x4 ø3 x14mm Tweeter Front Panel Speaker Box UNIT Woofer Speaker Cord Holder Speaker Cord Driver MAIN UNIT SPEAKER Rear Cabinet (F1) x1 ø3 x8mm (F2) x1 Power Transeformer Power PWB

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 adjust- ment, 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. 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. – 5 – Figure 5-5 Figure 5-4 Figure 5-2 Figure 5-1 Figure 5-3 Pinch Roller (C1) Pinch Roller Pawl A Record/Playback Head Erase Head (A1) x1 ø2x3mm (A1) x1 ø2x7mm Hook (A2) x2 TAPE 1 Playback Head (B1) x1 ø2x3mm (B1) x1 ø2x7mm TAPE 2 TAPE 2 TAPE 1 TAPE 2 Main Bert TAPE 1 Main Bert Moter Moter REW / FF Clutch Ass'y REW / FF Clutch Ass'y Main Belt (E1) x1 Main Belt (E2) x1 REW / FF Belt (E3) x1 REW / FF Belt (E3) x1 Frywheel Frywheel (D1) x2 ø2 x4mm (D1) x2 ø2 x4mm (D1) x2 ø2 x4mm Motor Bracket (D2) x3 Special Screw Motor Bracket Motor