Sharp 4M-IOM Service Manual
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Sharp 4M-IOM Service Manual

Sharp 4M-IOM Service Manual

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S H A R P
In the interests of user-safety (Required by safety regulations in some countries ) the set should be
restored to its original condition and only parts identical to those specified should be used.
LOCATION AND IDENTIFICATION OF CONTROLS . . . . . . . . . . . . . . . . . . . . . . 4
DISASSEMBLY AND REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLE SHOOTING TABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a.. . . . . 6
ADJUSTMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
CHASSIS LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SCHEMATIC DIAGRAM AND WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . .
PRINTED WIRING BOARD ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SERVICE MANUAL
MODEL
CONTENTS
. . . m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

SHARP CORPORATION

LCD COLOUR TELEVISION
. . . . . . . . . . . . . . . . . . . . . . . . . .
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Summary of Contents for Sharp 4M-IOM

  • Page 1: Table Of Contents

    ..........37 SHARP CORPORATION...

  • Page 2: Important Service Safety Precaution

    IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and servicing guidelines which follow: WARNING Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. AC.) or more is excessive and circuit should be attempted.

  • Page 3: Electrical Specifications

    ELECTRICAL SPECIFICATIONS Model LCD Colour TV TV screen 4” (6.2 x 8.2cm/diagonal 10.3cm) Screen Size Transmission TN LCD panel LCD Panels Drive method 37,440 (117 x 320) Number of pixels VHF: 48.25-294.25MHz Receiving frequency UHF: 471.25~855.25MHz 200 mW Audio output Speaker Fluorescent light tube, built-in(cold cathord type) Light source...

  • Page 4: Location And Identification Of Controls

    LOCATION AND INDENTIFICATION OF CONTROLS External antenna socket Volume V / A buttons Speaker Brightness V / A buttons A N i n p u t System change button Diversity socket Rod antenna Earphone jack Set stand Video input indicator Tint control I LCD screen panel Mounting socket...

  • Page 5: Disassembly And Reassembly

    DISASSEMBLY AND REASSEMBLY Remove the 7 rear cover fastening screws. Remove the light guide fastening screws. Undo the 3 light guide hooks. Remove the 4 LCD holder fastening screws. Remove the 4 Tuner PWB fastening screws.

  • Page 6: Trouble Shooting Table

    TROUBLE SHOOTING TABLE TROUBLE SHOOTING TABLE (Continued) Prior checks: NEITHER IMAGE NOR SOUND COMES OUT Is fuse F701 normally functioning 7 Are voltages applied at of tuner (corresponding Replace fuse F701. Are the secondary outputs ( + 5V. -8V, + 13V, Fuse F701 easily blows out.
  • Page 7 TROUBLE SHOOTING TABLE (Continued) TROUBLE SHOOTING TABLE (Continued) Prior checks: NO SOUND IS HEARD...

  • Page 8: Adjustment Procedures

    ADJUSTMENT PROCEDURES ADJUSTMENT PROCEDURES (Continued ) Adjusting Conditions Adjusting Procedures Adjusting Conditions Adjusting Procedures . + B ADJUSTMENT : VR701 1. Connect the DC voltage meter to TP701. 1. Adjust VR701 so that the + 5V line becomes 1. Feed colour bar signal. 1.
  • Page 9 ADJUSTMENT PROCEDURES ADJUSTMENT PROCEDURES (Continued) (Continued ) Adjusting Procedures Adjusting Conditions Adjusting Conditions PAL CHROMA (1 H DELAY) ADJUSTMENT : VR803, L807 . SECAM KILLER ADJUSTMENT : L811 maximum. difference between the green and magenta and (45) of IC801) with a resistor, one for each, in levels.
  • Page 10 ADJUSTMENT PROCEDURES (Continued ) Adjusting Conditions Adjusting Procedures control to middle position. [Standard settings] in this order. . R-WHITE BALANCE ADJUSTMENT : VR810, VR812 amplitude of the waveform on the oscilloscope jack. screen becomes minimum. signal of channel-l to the channel-2. .

  • Page 11: Chassis Layout

    CHASSIS LAYOUT S Y S T E 5701 SELECT SW SELECT SW C H A N G E S SELECT SW (Component Side) S E W S Y S T E S E L E C T S L E D ( A / V ) DC 5V ADJ DIVERSIT...
  • Page 12 (Wiring Side) . LED PWB L E D A / V ‘I- ( G R E E N ) 0 4 0 7 L E D A U T O...

  • Page 13: Schematic Diagram And Waveforms

    SCHEMATIC DIAGRAM AND WAVEFORMS Voltages were measured with a 20k ohm tester under the following conditions; supply voltage at AC 1 lo-240V (SO/60 Hz), colour bar signal input from servicing colour bar signal generator, and adjustment controls at their best positions. Waveforms were observed with colour bar signal input from servicing colour bar signal generator and 2 7.5Vp-p O.Sms/div 3 300mVp-p 2OysIdiv...
  • Page 14 SCHEMATIC DIAGRAM : AC ADAPTOR ) COMPONENTS...
  • Page 15 SCHEMATIC DIAGRAM : MAIN...
  • Page 16 I ’...
  • Page 17 SCHEMATIC DIAGRAM : TUNER RI I5 0 5 0 2 0 1 0 3...
  • Page 18 AFT/BAND/TUNING T "OOP L-------l...

  • Page 19: Printed Wiring Board Assemblies

    PRINTED WIRING BOARD ASSEMBLIES MAIN PWB (Component Side)
  • Page 20 LED PWB (Component Side)
  • Page 21 MAIN PWB (Wiring Side)
  • Page 22 LED PWB (Wiring Side)
  • Page 23 PRINTED WIRING BOARD ASSEMBLIES (Continued) TUNER PWB (Component Side)

  • Page 25: Block Diagram

    BLOCK DIAGRAM A U D I O up.
  • Page 26 K E Y M A T R I X i i i...

  • Page 27: Parts List

    Ref. No. Part No. Description Code PARTS LIST TRANSISTORS PARTS REPLACEMENT 4 4 0 3 4 4 0 4 Replacement parts which have these special saFety characteristics 4 4 0 5 in this manual: electrical components having such Features are identiFied by A in the Replacement Parts Lists. 4 4 0 7 The use OF a substitute replacement part which does not have 4 6 0 1...
  • Page 28 Description Description Code Ref. No. Part No. Code Ref. No. Part No. CONTROLS (Continued) MAIN PWB UNIT (Continued) DIODES (Continued ) CAPACITORS PACKAGED CIRCUITS COIL AND TRANSFORMERS J C o i l ( C h i p ) J C o i l ( C h i p ) J C o i l ( C h i p ) J C o i l ( C h i p ) Coil...
  • Page 29 Description Code Ref. No. I CAPACITORS (Continued ) MAIN PWB UNIT (Continued) 1 OV Electrolytic CAPACITORS (Continued ) 1 OV Electrolytic J O.lpF...
  • Page 30 Code Description Ref. No. Description Code Part No. Ref. No. RESISTORS (Continued ) MAIN PWB UNIT (Continued) CAPACITORS (Continued ) 1 0 0 1/16W C h i p 1 OV Tantalum RESISTORS J 1 0 0 1116W C h i p J 1 0 0 1/16W C h i p J 1 0 0 1/16W C h i p J 1 0 0 1/16W C h i p...
  • Page 31 Ref. No. Description Code Description Ref. No. Part No. Code RESISTORS (Continued ) (Continued) MAIN PWB UNIT J lk RESISTORS (Continued ) MISCELLANEOUS PARTS J Jack,External J Switch,ChannelCall...
  • Page 32 Ref. No. Part No. Description Code Description Code Ref. No. Part No. PACKAGED CIRCUITS TUNER PWB UNIT (Continued) TUNER THE PARTS HERE SHOWN ARE SUPPLIED AS AN NOTE: ASSEMBLY BUT NOT INDEPENDENTLY. T u n e r COILS AND TRANSFORMERS INTEGRATED CIRCUITS TRANSISTOR 4 1 0 2...
  • Page 33 Ref. No. Description Part No. Code Description Ref. No. Part No. Code CAPACITORS (Continued) TUNER PWB UNIT (Continued) CONTROLS C e r a m i c CAPACITORS J 0.33pF 35V T a n t a l u m A D J O.lpF 50V E l e c t r o l y t i c A D RESISTORS 1 I1 6W (Chip)
  • Page 34 Code Ref. No. Part No. Description Ref. No. Part No. Description Code RESISTORS (Continued) TUNER PWB UNIT (Continued) RESISTORS (c 3 3 0 ll16W ( C h i p ) 3 3 0 ll16W ( C h i p ) 5 6 0 ll16W ( C h i p ) 4 7 0 ll16W ( C h i p ) 5 6 0 ll16W ( C h i p )

  • Page 35: Cabinet And Mechanical Parts

    CABINET AND MECHANICAL PARTS...
  • Page 36 Part No. Description Code Part No. Description Code CABINET AND MECHANICAL PARTS J C a b i n e t Ass’y l - l J B u t t o n , M e m o r y J K n o b , M o d e J B u t t o n , Ass’y J K n o b , P o w e r J C o v e r...

  • Page 37: Packing Of The Set

    PACKING OF THE SET Polystyrene Cover Antenna Adantnr Earphone Adaptor Socket Pluq...
  • Page 38 S H A R P Printed in Japan...

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