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Sharp QT-80W Service Manual

Stereo radio cassette recorder
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SPECIFICATIONS ............................................................................................................................................................. 2
VOLTAGE SELECTION ..................................................................................................................................................... 2
AC POWER SUPPLY CORD AND AC PLUG ADAPTOR ................................................................................................. 2
NAMES OF PARTS ........................................................................................................................................................... 3
HOW TO SET THE POINT "0" ON TUNER DIAL MEMORY ............................................................................................. 3
DISASSEMBLY .................................................................................................................................................................. 4
REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 5
ADJUSTMENT ................................................................................................................................................................... 7
SCHEMATIC DIAGRAM .................................................................................................................................................. 10
WIRING SIDE OF P.W.BOARD ....................................................................................................................................... 12
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 14
TYPES OF TRANSISTOR ............................................................................................................................................... 14
VOLTAGE ........................................................................................................................................................................ 14
PARTS GUIDE/EXPLODED VIEW
All manuals and user guides at all-guides.com
SERVICE MANUAL
STEREO RADIO CASSETTE RECORDER
CONTENTS
SHARP CORPORATION
QT-80W
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.
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
QT-80W
No. S4129QT80W///
Page
Table of Contents
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  • Page 1: Table Of Contents

    All manuals and user guides at all-guides.com QT-80W SERVICE MANUAL No. S4129QT80W/// STEREO RADIO CASSETTE RECORDER QT-80W 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.

  • Page 2: Specifications

    All manuals and user guides at all-guides.com QT-80W FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. SPECIFICATIONS 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]...

  • Page 3: Names Of Parts

    All manuals and user guides at all-guides.com QT-80W NAMES OF PARTS 01. Function/Beat Cancel Switch 3 4 5 6 7 8 9 10 02. Cassette Compartment 03. Record Button 04. Play Button 05. Rewind Button 06. Fast Forward Button 07. Stop/Eject Button 08.

  • Page 4: Disassembly

    All manuals and user guides at all-guides.com QT-80W DISASSEMBLY Front Cabinet Caution on Disassembly (B1)x1 Volume (A2)x6 Follow the below-mentioned notes when disassembling the ø3x30mm unit and reassembling it, to keep it safe and ensure excellent performance: 1. Take cassette tape out of the unit.

  • Page 5: Removing And Reinstalling The Main Parts

    All manuals and user guides at all-guides.com QT-80W Tape Mechanism Stop/Eject Button Front Cabinet Push Cassette Holder Open (J1)x4 (K1)x3 ø3x10mm X-BASS ø2.6x8mm Figure 5-1 Figure 5-2 REMOVING AND REINSTALLING THE MAIN PARTS TAPE MECHANISM SECTION Perform steps 1 to 9 of the disassembly method to remove the tape mechanism.
  • Page 6 All manuals and user guides at all-guides.com QT-80W How to remove the belts (See Fig. 6-1.) 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.

  • Page 7: Adjustment

    All manuals and user guides at all-guides.com QT-80W ADJUSTMENT TUNER SECTION fL: Low-range frequency fH: High-range frequency FM Section Step Alignment Test Equipment Signal-in Signal-out Adjust Remark Frequency FM IF: (1) FM IF sweep Inject the IF Signal are taken Adjust T106, T108 (1) Band SW in FM.
  • Page 8 All manuals and user guides at all-guides.com QT-80W 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...
  • Page 9 All manuals and user guides at all-guides.com QT-80W MAIN PWB T201 L109 BIAS MW BAR ANTENNA OSCILLATION TRACKING fL C216 VR102 T106 DETECTION T103 MW IF MW BAND COVERAGE fL FM BAND COVERAGE CT102 FM IF IC101 T107 SW1 BAND...

  • Page 10: Schematic Diagram

    All manuals and user guides at all-guides.com QT-80W L103 T103 FM BAND MW BAND CT102 SW1 BAND T105 SW2 BAND IC101 COVERAGE COVERAGE COVERAGE COVERAGE T104 CT101 FM FRONT END LA1186N L102 L100 T101 T102 BP101 ANTENNA BAND PASS TRACKING...
  • Page 11 All manuals and user guides at all-guides.com QT-80W OUT 1 150K NF 1 13 15 N.C. IN 1 STEREO POST FM IF PILOT DET TNG. INDIC. AMP. DRIVE GND(SUB) RF AMP LEVEL DET MUTING IN 2 PHASE DET AM IF...

  • Page 12: Wiring Side Of P.w.board

    All manuals and user guides at all-guides.com QT-80W T105 T103 T104 C119 C120 C118 C145 CT102 C121 C112 C136 R124 R120 C111 C137 S101 CT101 T106 C135 VR102 S101 C133 R119 BAND R117 SELECTOR L109 MW BAR ANTENNA C134 IC102...
  • Page 13 All manuals and user guides at all-guides.com QT-80W COLOR TABLE BROWN RD(R) JK201 ORANGE YELLOW JK201 CN202 GREEN MIXING BLUE MICROPHONE VIOLET GRAY WH(W) WHITE R234 SP502 L-CH BLACK CON203 CN203 PINK JK301 LINE INPUT C227 BUILT-IN MICROPHONE R-CH CN301...

  • Page 14: Notes On Schematic Diagram

    All manuals and user guides at all-guides.com QT-80W NOTES ON SCHEMATIC DIAGRAM • Resistor: POSITION REF. NO DESCRIPTION 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...
  • 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 All manuals and user guides at all-guides.com QT-80W PRICE PRICE DESCRIPTION PARTS CODE DESCRIPTION PARTS CODE RANK RANK INTEGRATED CIRCUITS C111 VCCSPA1HL301K 300 pF,50V C112 VCCSPA1HL5R0D J AA 5 pF,50V C113 VCTYPA1HB152K 1500 pF,50V IC101 VHILA1186N/-1 AE FM Front End,LA1186N 0.0047 µF,50V...
  • Page 17 All manuals and user guides at all-guides.com QT-80W PRICE PRICE DESCRIPTION PARTS CODE PARTS CODE DESCRIPTION RANK RANK R106,107 VRD-ST2CD104J AA 100 kohm,1/6W CON201,202 92L3101-054003 Plug,4Pin R108,109 VRD-ST2CD223J AA 22 kohms,1/6W CON203 92L3101-054001 Plug,2Pin R110 VRD-ST2CD101J AA 100 ohm,1/6W CON301,302...
  • Page 18 All manuals and user guides at all-guides.com QT-80W PRICE DESCRIPTION PARTS CODE RANK 92L60026450800 Screw,ø2.6×8mm 92L60030500610 Screw,ø3×6mm 92L60220500410 Screw,ø2×4mm 92L60620400410 Screw,ø2×4mm 92L61030010810 Screw,ø3×8mm 92L61030011010 Screw,ø3×10mm 92L61030011210 Screw,ø3×12mm 92L61030023010 Screw,ø3×30mm 92L61126010800 Screw,ø2.6×8mm 92L61130011210 Screw,ø3×12mm 92L61226010810 Screw,ø2.6×8mm 92L61230010810 Screw,ø3×8mm 92L61430011010 Screw,ø3×10mm 92L61530041010 Screw,ø3×10mm...
  • Page 19 All manuals and user guides at all-guides.com QT-80W 608x3 202-1 SO501 202-2 605x2 608x3 610x2 SW501 605x2 PWB-A3 T501 616x2 TAPE PWB-A6 MECHANISM PWB-A2 204-2 241(241-1, 241-2, 241-3, 241-4, 204-1 241-5 (M601), 615x2 241-6 (SW601)) 240x2 606x3 203-1 619x2 PWB-A1...
  • Page 20 All manuals and user guides at all-guides.com QT-80W © 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.

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