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Sharp QT-90W Service Manual

Stereo radio cassette recorder
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SPECIFICATIONS ............................................................................................................................................................. 1
VOLTAGE SELECTION ..................................................................................................................................................... 1
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................. 2
NAMES OF PARTS ........................................................................................................................................................... 2
HOW TO SET THE POINT "0" ON TUNER DIAL MEMORY ............................................................................................. 2
DISASSEMBLY .................................................................................................................................................................. 3
REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 4
ADJUSTMENT ................................................................................................................................................................... 6
NOTES ON SCHEMATIC DIAGRAM ................................................................................................................................ 9
TYPES OF TRANSISTOR AND LED ................................................................................................................................. 9
VOLTAGE .......................................................................................................................................................................... 9
SCHEMATIC DIAGRAM .................................................................................................................................................. 10
WIRING SIDE OF P.W.BOARD ....................................................................................................................................... 12
BLOCK DIAGRAM OF IC ................................................................................................................................................. 14
PARTS GUIDE/EXPLODED VIEW
General
Power source
AC 110-127/220-240 V, 50/60 Hz
DC 15 V ["D" size (UM/SUM-1, R20 or HP-2) battery x 10]
Power consumption
40 W
Output power
MPO: 36 W (18 W + 18 W) (AC operation, 10 % T.H.D)
RMS: 20 W (10W + 10W) (DC operation, 10 % T.H.D)
Speakers
8 cm (3-1/8") full range speaker x 4
Output terminal
Headphones: 16 - 50 ohms (recommended: 32 ohms)
Input terminal
Mixing microphone: 600 ohms
Line input: 350 mV/47 kohms
Dimensions
Width: 520 mm (20-1/2")
Height: 191 mm (7-1/2")
Depth: 216 mm (8-1/2")
Weight
4.7 kg (10.4 lbs.) without batteries
Specifications for this model are subject to change without prior notice.
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)
SERVICE MANUAL
STEREO RADIO CASSETTE RECORDER
CONTENTS

VOLTAGE SELECTION

SHARP CORPORATION
- 1 -
QT-90W
MODEL
• 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.
Radio
Frequency range
Tape recorder
Frequency response
Signal/noise ratio
Wow and flutter
Motor
Bias system
Erase system
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
QT-90W
No. S6143QT90W///
Page
FM: 88 - 108 MHz
SW1: 2.3 - 7.3 MHz
SW2: 7.3 - 22 MHz
MW: 526.5 - 1,606.5 kHz
60 - 12,000 Hz (Normal tape)
40 dB
0.3 % (WRMS)
DC 12 V electric governor
AC bias
Magnet erase

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  Summary of Contents for Sharp QT-90W

  • Page 1: Table Of Contents

    QT-90W SERVICE MANUAL No. S6143QT90W/// STEREO RADIO CASSETTE RECORDER QT-90W MODEL • 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 ................................1 VOLTAGE SELECTION ..............................
  • Page 2: Ac Power Supply Cord And Ac Plug Adaptor

    QT-90W FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. AC POWER SUPPLY CORD AND AC PLUG ADAPTOR QACCB0012AW00 QACCA0004AW00 QPLGA0003AWZZ QACCE0007AW00 QPLGA0004AWZZ QACCL0002AW00/QACCL0008AW00 NAMES OF PARTS 01. Function/Beat Cancel Switch 3 4 5 6 7 8 9 10 02.
  • Page 3: Disassembly

    QT-90W DISASSEMBLY Volume Front Cabinet Caution on Disassembly (B1)x1 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. (B2)x1 2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.
  • Page 4: Removing And Reinstalling The Main Parts

    QT-90W Graphic Equalizer Tape Mechanism Front Cabinet Stop/Eject Buttom Push Open (L1)x2 ø2.6x8mm Cassette Holder (J1)x4 ø3x10mm (K1)x3 Surround PWB ø2.6x8mm Figure 4-2 Figure 4-1 REMOVING AND REINSTALLING THE MAIN PARTS TAPE MECHANISM SECTION Perform steps 1 to 9 of the disassembly method to remove the tape mechanism.
  • Page 5 QT-90W How to remove the belts (See Fig. 5-1.) Motor 1. Remove the main belt (C1) x 1 pc., from the motor pulley. 2. Remove the FF/REW belt (C2) x 1 pc., from the REW/FF roller. Main Belt 3. Put on the belts in the reverse order of removal.
  • Page 6: Adjustment

    QT-90W ADJUSTMENT TUNER SECTION fL: Low-range frequency fH: High-range frequency FM Section Step Alignment Test Equipment Signal-in Adjust Remark Signal-out Frequency FM IF: (1) FM IF sweep Inject the IF Signal are taken Adjust T106, T108 (1) Band SW in FM.
  • Page 7 QT-90W MW Section Step Alignment Test Equipment Signal-in Signal-out Adjust Remark Frequency MW IF: 455 kHz (1) AM IF sweep Let the MW ANT Take out the signal Adjust T107 get MAX. (1) Band SW in MW generator with coil close to the...
  • Page 8 QT-90W T201 L109 MW BAR ANTENNA TRACKING fL VR102 T106 DETECTION T103 MW IF MW BAND COVERAGE fL FM BAND COVERAGE FM IF IC101 T104 T107 T108 SW1 BAND COVERAGE T101 L102 CT102 L103 CT104 TRACKING TRACKING T105 SW2 BAND...
  • Page 9: Notes On Schematic Diagram

    QT-90W NOTES ON SCHEMATIC DIAGRAM • Resistor: DESCRIPTION POSITION REF. NO To differentiate the units of resistors, such symbol as K and S101 BAND SELECTOR FM—MW—SW1—SW2 M are used: the symbol K means 1000 ohm and the symbol S201 RECORD/PLAYBACK REC—P.B.
  • Page 10: Schematic Diagram

    QT-90W MAIN PWB-A1 L103 FM BAND T103 MW BAND CT102 T105 SW1 BAND SW2 BAND IC101 COVERAGE COVERAGE COVERAGE COVERAGE T104 CT101 FM FRONT END LA1186N L102 L100 T101 T102 BP101 TRACKING TRACKING BAND PASS TRACKING TRACKING CT104 CT103 C101...
  • Page 11: Graphic Equalizer

    QT-90W IC301 MW/SW1/SW2 SIGNAL FM SIGNAL SURROUND EFFECT CONTROL LINE S301-C BA4558 FM(MONO)/BEAT PLAYBACK SIGNAL RECORD SIGNAL L-CH FM(ST) L-CH C301 (1/2) S301 TAPE 1/50 IC501 R313 FUNCTION/ SURROUND (STAND-BY) R310 2.2K LEVEL METER. & SURROUND INDICATER BEAT CANCEL IC301...
  • Page 12: Wiring Side Of P.w.board

    QT-90W MAIN PWB-A1 T105 T103 T104 CT102 C119 C118 C142 C112 C121 C136 C137 C111 CT101 T106 S101 R120 VR102 C135 GRAPHIC EQUALIZER PWB-B C130 S101 C133 GRAPHIC R119 BAND C134 X-BASS EQUALIZER SELECTOR L109 R117 VR303 VR302 VR301 CON203...
  • Page 13 QT-90W JACK PWB-A2 BUILT-IN MICROPHONE CN201A CON201A C233 JK202 SP502 JK202 L-CH MIXING MICROPHONE CN203 L-CH C227 JK201 CN202 LINE INPUT GRAPHIC X-BASS EQUALIZER SP501 SPEAKERS R-CH VR303 VR302 VR301 SURROUND L-CH 1KHz L-CH 10KHz CN402B SP503 R-CH CN402A GRAPHIC...
  • Page 14: Block Diagram Of Ic

    QT-90W BLOCK DIAGRAM OF IC IC102: LA1805 13 15 STEREO POST PILOT DET FM IF TNG. INDIC. AMP. DRIVE RF AMP LEVEL DET MUTING PHASE DET AM IF STEREO TUNING RNG. DECODER INDIC. DRIVE IC201: BA3313L IC101: LA1186N OUT 1...
  • Page 15 “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the For U.S.A. only following information. Contact your nearest SHARP Parts Distributor to order. 1. MODEL NUMBER 2. REF. No. 3. PART NO. 4. DESCRIPTION For location of SHARP Parts Distributor, Please call Toll-Free;...
  • Page 16 QT-90W PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK INTEGRATED CIRCUITS CAPACITORS AA 0.001 µF,50V IC101 VHILA1186N/-1 AE FM Front End,LA1186N C101 VCKYPA1HB102K AA 0.001 µF,50V IC102 VHILA1805//-1 AM FM IF Det./MW/SW Mixer, C102 VCCSPA1HL102J AC 10 µF,16V,Electrolytic...
  • Page 17 QT-90W PRICE PRICE PARTS CODE DESCRIPTION PARTS CODE DESCRIPTION RANK RANK AB 0.022 µF,50V,Mylar C345,346 VCQYKA1HM223K J R314,315 VRD-ST2CD103J AA 10 kohm,1/6W C347,348 VCTYPA1HB331K 330 pF,50V R316 VRD-ST2CD121J AA 120 ohms,1/6W AB 4.7 µF,50V,Electrolytic C401,402 VCEAZA1HW475M J R317 VRD-ST2CD222J AA 2.2 kohms,1/6W AB 47 µF,16V,Electrolytic...
  • Page 18: Specifications

    QT-90W PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK S301 92L4103-022001 Switch,Slide Type 92L61540041410 Screw,ø4×14mm [Function/Beat Cancel] 92L62030011010 Screw,ø3×10mm 1 S501 92L4106-011001 Switch,Slide Type 92L66090752012 Nut,ø9×ø12×2mm [Voltage Selector] 92L62030061070 Screw,ø3×10mm 1 SO501 92L3204-016001 AC Input Socket 92L61440041010 Screw,ø4×10mm...
  • Page 19 QT-90W 608x3 SO501 608x3 605x2 S501 610x2 605x2 PWB-A3 T501 616x2 PWB-A2 TAPE PWB-A6 MECHANISM 204-2 241(241-1,241-2, 241-3,241-4, 204-1 241-5(M601), 615x2 241-6(SW601)) PWB-A1 240x2 203-1 606x3 619x2 613x4 203-2 611x2 PWB-B 611x3 613x4 PWB-A5 Silicon Grease SP501 606x2 IC401 613x4...
  • Page 20 QT-90W © COPYRIGHT 2001 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.