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Sharp 20F650 Service Manual

Color television
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See also: Operating Manual
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.
» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
» LOCATION OF USER'S CONTROL ..................................................................................................... 6
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 7
» SERVICE MODE .................................................................................................................................. 8
» ADJUSTMENT METHOD ................................................................................................................... 14
» CHASSIS LAYOUT ............................................................................................................................. 28
» BLOCK DIAGRAM .............................................................................................................................. 29
» WAVEFORMS ..................................................................................................................................... 33
» DESCRIPTION OF SCHEMATIC DIAGRAM ...................................................................................... 34
» SCHEMATIC DIAGRAMS ................................................................................................................... 35
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 39
» REPLACEMENT PARTS LIST ............................................................................................................ 43
» PACKING OF THE SET ...................................................................................................................... 49
POWER INPUT .................................................... AC 120 V, 60 Hz
POWER RATING .................................................................... 88W
PICTURE SIZE .......................................... 1,239 cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS .................................................. QFP/UNI-B1 Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency .................................... 42.17 MHz
AUDIO POWER
OUTPUT RATING ........................................ 2.5 W(RMS) x 2pcs

SHARP CORPORATION

SERVICE MANUAL

MODEL
CONTENTS

ELECTRICAL SPECIFICATIONS

SPEAKER
SIZE ................................................................... 12 x 5 cm, 2pcs
2
(192sq inch)
VOICE COIL IMPEDANCE ............................. 16 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ..................................................... 75 ohm Unbalanced
TUNING RANGES
VHF-Channels ............................................................... 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels ........................................................... 1 thru 125
(Nominal)
Specifications are subject to change without
prior notice.
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
COLOR TELEVISION
Chassis No. GA-4
20F650
(EIA, Channel Plan U.S.A.)
20F650
S35F420F650///
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  • Page 1: Table Of Contents

    20F650 SERVICE MANUAL S35F420F650/// COLOR TELEVISION Chassis No. GA-4 20F650 MODEL 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.

  • Page 2: Important Service Safety Precaution

    20F650 IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOLTAGE LIMITS 1. For continued safety, no modification of any circuit 1.

  • Page 3: Safety Notice

    20F650 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) BEFORE RETURNING THE RECEIVER • Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop Before returning the receiver to the user, perform across the resistor.
  • Page 4 20F650 PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ë Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. AVERTISSEMENT LIMITES DES RADIATIONS X ET DE LA HAUTE TENSION 1.
  • Page 5 20F650 PRECAUTIONS A PRENDRE LORS DE LA REPARATION (Suite) » Toucher avec la sonde d'essai les pièces métalliques VERIFICATIONS CONTRE L'INCEN-DIE ET exposées qui présentent une voie de retour au LE CHOC ELECTRIQUE châssis (antenne, coffret métallique, tête des vis, Avant de rendre le récepteur à...

  • Page 6: Location Of User's Control

    20F650 LOCATION OF USER'S CONTROL...

  • Page 7: Installation And Service Instructions

    20F650 INSTALLATION AND SERVICE INSTRUCTIONS Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdrivers or TV alignment tools. (2) Before performing adjustments, the TV set must be on at least 15 minutes. CIRCUIT PROTECTION HIGH VOLTAGE CHECK...

  • Page 8: Service Mode

    20F650 SERVICE MODE Service Mode Overview 1. Service mode is entered by SERVICE key input or CH-UP +VOL-DOWN input during reset. 2. Service mode is cleared by entering SERVICE key command during service mode. 3. If key input port (SERVICE) input is LOW, then it is in service mode.
  • Page 9 20F650 Adjustment Mode Items Item Name Register Range Default SUB-PICTURE 1 Chip CONTRAST 0~127 SUB-TINT 1 Chip TINT 0~127 SUB-COLOR 1 Chip COLOR 0~127 SUB-BRIGHT 1 Chip BRIGHT 0~255 SUB-SHARP 1 Chip VIDEO-TONE 0~63 V-SHIFT 1 Chip V-SHIFT H-SHIFT 1 Chip...

  • Page 10: Self Adjustment

    20F650 Ë SELF ADJUSTMENT H-VCO 1. When there is H-VCO self-adjustment key input for adjustment item H-VCO, self-adjustment is performed. 2. H-FREE(1chip) is set to 1. 3. H-OUT is set by intelligent monitor output. 4. IM input is set as TIM input.
  • Page 11 20F650 Setting Mode Items Item Name Register Range Default VIDEO TONE -GAIN (TV) 1 Chips V-TONE VIDEO TONE -GAIN (AV) 1 Chips V-TONE VIDEO TONE -GAIN (S-AV) 1 Chips V-TONE VIDEO TONE -GAIN(YUV) 1 Chips V-TONE ABCL 1 Chips ABCL...
  • Page 12 20F650 Setting Mode Items (Continued) Item Name Register Range Default FAO-VOL 0~63 CHARGE PUMP CC LEVEL MICON CC LEVEL OSD POS MICON OSD POS OFFSET-ADJ-COL 1 Chips COLOR -32~+32 OFFSET-ADJ-TINT 1 Chips TINT -32~+32 OFFSET-ADJ-TINT-YUV 1 Chips BASEBAND-TINT -32~+32 WAIT MD TIMER...
  • Page 13 20F650 Option Mode Items OPTION FUNCTION Default Data DEMO Without DEMO With DEMO DOWNLOAD Without V-CHIP OP With V-CHIP OP V-CHIP Without V-CHIP With V-CHIP SPEAKER Without SPEAKER With SPEAKER Without FAO With FAO P.PREF Without P.REF With P.REF UNIV+...

  • Page 14: Adjustment Method

    20F650 ADJUSTMENT METHOD Caution: to get into the service mode, one of the ways is press direct key for service items. the other ways is short the main chassis JA301 and JA410 There is three stage of Service Mode data...
  • Page 15 20F650 Second Stage Data Service Mode Function Range Default Data VIDEO TONE -GAIN (TV) V-TONE VIDEO TONE -GAIN (AV) V-TONE VIDEO TONE -GAIN (S-AV) V-TONE VIDEO TONE -GAIN(YUV) V-TONE ABCL ABCL BS-OFF ABCL-G ABCL-G SHP-AV VIDEO-TONE(OFFSET) -16~+16 SHP-SAV VIDEO-TONE(OFFSET) -16~+16...
  • Page 16 20F650 Second Stage (Continued) Data Service Mode Function Range Default Data CHARGE PUMP CC LEVEL CC LEVEL OSD POS OSD POS OFFSET-ADJ-COL COLOR -32~+32 OFFSET-ADJ-TINT TINT -32~+32 OFFSET-ADJ-TINT-YUV BASEBAND-TINT -32~+32 WAIT MD TIMER SLOW MODE R-CUT-YUV R-CUT(OFFSET) -63~+63 G-CUT-YUV G-CUT(OFFSET)
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  • Page 28: Chassis Layout

    20F650 CHASSIS LAYOUT...

  • Page 29: Block Diagram

    20F650 CRT BLOCK DIAGRAM...

  • Page 30: Main Block Diagram

    20F650 MAIN BLOCK DIAGRAM...
  • Page 31 20F650...
  • Page 32 20F650 MTS BLOCK DIAGRAM...

  • Page 33: Waveforms

    20F650 WAVEFORMS...

  • Page 34: Description Of Schematic Diagram

    20F650 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: Photographs taken on a standard gated color bar 1. The unit of resistance "ohm" is omitted. signal, the tint setting adjusted for proper color. The (K=k Ω =1000 Ω , M=M Ω ) wave shapes at the red, green and blue cathodes of 2.

  • Page 35: Schematic Diagrams

    20F650 SCHEMATIC DIAGRAM: CRT Unit...
  • Page 36 20F650 SCHEMATIC DIAGRAM: MAIN Unit...
  • Page 37 20F650...
  • Page 38 20F650 SCHEMATIC DIAGRAM: MTS Unit...

  • Page 39: Printed Wiring Board Assemblies

    20F650 PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Unit (Wiring Side)
  • Page 40 20F650 PWB-A: MAIN Unit (Wiring Side)
  • Page 41 20F650 R1 0 2 7 RJ 1 6 R1 0 2 4 C1 0 1 6 R3 8 3 R1 0 0 3 R1 0 0 2 R1 0 0 7 F DC1 R1 0 8 3 Q1 0 7 2...
  • Page 42 20F650 PWB-C: MTS Unit (Wiring Side) R3 0 0 4 R3 0 0 3 C3 0 0 2 Q3 0 0 4 R3 0 0 5 R3 0 3 5 Q3 0 0 1 R3 0 2 9 R3 0 3 4...

  • Page 43: Replacement Parts List

    2. NO. DE REF 3. NO. DE PIECE 4. DESCRIPTION in USA: Contact your nearest SHARP Parts Distributor to order. For in CANADA: Contact SHARP Electronics of Canada Limited location of SHARP Parts Distributor, Please call Toll-Free; 1- Phone (416) 890-2100...
  • Page 44 20F650 Ref. No. Part No. Description Code Ref. No. Part No. Description Code D812 RH-EX0263TAZZY X Zener Diode, 8.1V C511 VCEA0A1VW477M+X 470 35V Electrolytic D1081 VHD1SS119//-1Y X 1SS119 C512 VCKYPA2HB102K+ X 1000p 500V Ceramic D1085 RH-EX1393CEZZY X Zener Diode, 5.1V...
  • Page 45 20F650 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C846 VCKYCY1HF103ZY X 0.01 50V Ceramic R434 VRS-CY1JF750JY X 75 1/16W Metal Oxide C847 VCCCCY1HH220JY X 22p 50V Ceramic R435 VRS-CY1JF750JY X 75 1/16W Metal Oxide C848...
  • Page 46 20F650 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R826 VRD-RA2BE101JY X 100 1/8W Carbon R1896 VRS-CY1JF473JY X 47k 1/16W Metal Oxide R827 VRS-CY1JF102JY X 1k 1/16W Metal Oxide R3006 VRS-CY1JF101JY X 100 1/16W Metal Oxide...
  • Page 47 20F650 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R864 VRD-RA2BE470JY X 47 1/8W Carbon RESISTORS R876 VRD-RA2BE121JY X 120 1/8W Carbon R3001 VRS-CY1JF221JY X 220 1/16W Metal Oxide R877 VRD-RA2BE121JY X 120 1/8W Carbon R3002 VRS-CY1JF221JY X 220 1/16W Metal Oxide...
  • Page 48 – Polyethylene Bag — CABINET PARTS CCABAA323WEH7 X Front Cabinet Ass'y Not Available – Front Cabinet — HBDGB3155CESA X Badge, "SHARP" HDECQA119WJSA X LED, R/C Cover JBTN-A070WJKD X Button, Power MSPRC0005PEFW X Power Button Spring GDORFA015WJKD X Door MSPRPA012WJFW X Door Spring...

  • Page 49: Packing Of The Set

    20F650 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING OF THE SET X1,X2,X3...
  • Page 50 Code Ref. No. Part No. Description Code COPYRIGHT © 2005 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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