Sharp 27F640 Service Manual

Sharp 27F640 Service Manual

Chassis no. gb-3u
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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 ..................................................................................................... 4
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 5
» SERVICE ADJUSTMENT ..................................................................................................................... 9
» CHASSIS LAYOUT ............................................................................................................................. 12
» BLOCK DIAGRAM .............................................................................................................................. 13
» DESCRIPTION OF SCHEMATIC DIAGRAMS & WAVEFORMS ........................................................ 14
» SCHEMATIC DIAGRAMS ................................................................................................................... 15
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 22
» PARTS LIST ........................................................................................................................................ 27
» PACKING OF THE SET ...................................................................................................................... 35
POWER INPUT ..................................................... 120V AC, 60 Hz
POWER RATING .................................................................. 130W
PICTURE SIZE ....................................... 2,193.5 cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................... Hi-Bi-Potential 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 .............. 5.0W + 5.0W (at 10% distortion and

SHARP CORPORATION

SERVICE MANUAL

MODELS
CONTENTS

ELECTRICAL SPECIFICATIONS

SPEAKER
SIZE ........................................................ 12 x 6 cm oval (2 pcs.)
2
(339sq inch)
VOICE COIL IMPEDANCE ............................... 8 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)
Dual CH Operate)
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. GB-3U
27F640
27F641
(EIA, Channel Plan U.S.A.)
27F640
27F641
S14O227F640///
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Summary of Contents for Sharp 27F640

  • Page 1: Table Of Contents

    27F640 27F641 SERVICE MANUAL S14O227F640/// COLOR TELEVISION Chassis No. GB-3U 27F640 27F641 MODELS 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

    27F640 27F641 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

    27F640 27F641 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) Connect the resistor connection to all exposed metal BEFORE RETURNING THE RECEIVER 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: Location Of User's Control

    27F640 27F641 LOCATION OF USER'S CONTROL Front Panel POWER INSIDE DOOR Press Press again Off. VIDEO/AUDIO IN 2 TERMINALS REMOTE CONTROL SENSOR CHANNEL UP/DOWN MENU ( ) Selects next higher channel Press Accesses MAIN MENU. ( ) Selects next lower channel...
  • Page 5: Installation And Service Instructions

    27F640 27F641 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...
  • Page 6 27F640 27F641 For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit. Note: There are still a few analog adjustments in this series such as focus and master screen voltage. Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv- ice adjustments are required.
  • Page 7 TINT-S 0-127 (00h-7Fh) 62 (3Eh) Component Input C-TRAP 0-1 (00h-01h) 0 (00h) AUTO FRESH 0-1 (00h-01h) 0 (00h) SHARP P F 0-1 (00h-01h) 1 (01h) CD MATRIX 0-3 (00h-03h) 2 (02h) B-Y ATT 0-1 (00h-01h) 0 (00h) R-Y ATT 0-1 (00h-01h)
  • Page 8 27F640 27F641 DATA SERVICE NOTES FIXED VALUE ADJUSTMENT ITEM NUMBER (HEX) RANGE INITIAL VALUE EW CORNER BOTTOM 19-81 (13h-51h) 50 (32h) Offset toward D13. NOISE DET LEVEL 0-3 (00h-03h) 0 (00h) V CENTERING 0-63 (00-3Fh) 36 (24h) V-AGC 0-1 (00h-01h)
  • Page 9: Service Adjustment

    27F640 27F641 Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2101. ADJUSTMENT PART REPLACED NOTES NECESSARY UNNECESSARY IC2001 Data is stored in IC2101.
  • Page 10 27F640 27F641 Sub-Tint Adjustment Note: Aging for 10 min before adjustment. After the adjustment of V-center and V-size, re- 1. Receive the half color bar signal. adjustment for this V-line. RF INPUT (TU51) 2. Get into Y-Mute by R/C, or by setting the "V11" bus data to "01".
  • Page 11: Mts Adjustment

    27F640 27F641 Ë MTS ADJUSTMENT MTS Level Adjustment 1. Set the sound volume above 1. Monoral signal: 400Hz, 100% modulation 2. Confirm "EX4" data is "5Ah". 3. Vary the "M01" bus data until the voltage to pin (39) of IC3001 to become the value as stated below.
  • Page 12: Chassis Layout

    27F640 27F641 CHASSIS LAYOUT...
  • Page 13: Block Diagram

    27F640 27F641 BLOCK DIAGRAM...
  • Page 14: Description Of Schematic Diagrams & Waveforms

    27F640 27F641 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 1. 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=kW=1000W, M=MW) wave shapes at the red, green and blue cathodes of 2.
  • Page 15: Schematic Diagrams

    27F640 27F641 SCHEMATIC DIAGRAM: CRT Unit...
  • Page 16 27F640 27F641 SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 17 27F640 27F641...
  • Page 18 27F640 27F641 SCHEMATIC DIAGRAM: MAIN-2 Unit...
  • Page 19 27F640 27F641...
  • Page 20 27F640 27F641 SCHEMATIC DIAGRAM: 3-LINE Y/C Unit...
  • Page 21 27F640 27F641...
  • Page 22: Printed Wiring Board Assemblies

    27F640 27F641 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Components Side)
  • Page 23 27F640 27F641...
  • Page 24 27F640 27F641 PWB-A: MAIN Unit (Components side)
  • Page 25 27F640 27F641...
  • Page 26 27F640 27F641 PWB-B: CRT Unit (Wiring Side) PWB-C: 3-LINE Y/C Unit (Wiring Side) PWB-C: 3-LINE Y/C Unit (Chip Parts Side)
  • Page 27: Parts List

    IC602 VHiBA15218F2EY X BA15218F-E2 IC701 VHiTEA1533A-1 X TEA1533AP IC702 RH-FXA003WJZZ X PC123Y82 in USA: Contact your nearest SHARP Parts Distributor to order. For IC703 VHiSE130N++-F X SE130N çå location of SHARP Parts Distributor, Please call Toll-Free; 1- IC751 VHiPQ09RDA1-1 X PQ090RDA1SZ...
  • Page 28 27F640 27F641 Ref. No. Part No. Description Code Ref. No. Part No. Description Code D410 RH-EX0611GEZZY X Zener Diode, 5.1V L728 RCiLP0179CEZZ+ X Coil, 47 H D411 RH-EX0611GEZZY X Zener Diode, 5.1V L729 RCiLP0179CEZZ+ X Coil, 47 H D412 RH-EX0614GEZZY X Zener Diode, 5.6V...
  • Page 29 27F640 27F641 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C475 VCKYCY1CF104ZY X 0.1 Ceramic C755 VCEA0A1EW476M+X 47 Electrolytic C476 VCKYCY1HB103KY X 0.01 Ceramic C758 VCEA0A1HW475M+X 4.7 Electrolytic C501 VCKYPA2HB102K+ X 1000p 500V Ceramic C780 VCEA0A1HW226M+X 22...
  • Page 30 27F640 27F641 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R412 VRS-CY1JF101JY X 100 1/16W Metal Oxide AA C3004 VCEA0A1HW105M+X 1 Electrolytic R413 VRS-CY1JF101JY X 100 1/16W Metal Oxide AA C3005 VCEA0A1HW475M+X 4.7 Electrolytic R422 VRS-CY1JF000JY X 0...
  • Page 31 27F640 27F641 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R954 VRS-CY1JF221JY X 220 1/16W Metal Oxide AA çå R652 VRD-RA2EE103GY X 10k 1/4W Carbon R955 VRS-CY1JF221JY X 220 1/16W Metal Oxide AA çå R653 VRD-RA2EE562GY X 5.6k 1/4W...
  • Page 32 27F640 27F641 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R2502 VRS-CY1JF183JY X 18k 1/16W Metal Oxide AA TRANSISTORS R2503 VRS-CY1JF103JY X 10k 1/16W Metal Oxide AA Q850 VS2SA1266-Y-1+ X 2SA1266-Y R2504 VRS-CY1JF103JY X 10k 1/16W Metal Oxide AA...
  • Page 33 27F640 27F641 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R867 VRS-SV2HC392J X 3.9k 1/2W Metal Oxide AB å C1414 VCCCCY1HH3R0CYX 3p Ceramic R868 VRS-SV2HC682J X 6.8k 1/2W Metal Oxide AB å C1415 VCE9GA1CW106M+X 10 Electrolytic...
  • Page 34: Packing Parts

    Part No. Description Code Ref. No. Part No. Description Code PACKING PARTS MISCELLANEOUS PARTS (NOT REPLACEMENT ITEM) SPAKCB274WJZZ – Packing Case (27F640) — SPAKCB212WJZZ – Packing Case (27F641) — VSP1206PB708A X Speaker (L) SPAKP0109GJZZ – Wrapping Paper — VSP1206PB708A X Speaker (R) SPAKXA180WJZZ –...
  • Page 35: Packing Of The Set

    27F640 27F641 PACKING OF THE SET Polyethylene Bag Operation Manual Infrared R/C Unit Batteries Polyethylene Sheet Buffer Material FRONT Packing Case Use tape to fix the top side of packing case. REAR Use 12 staples to fix the bottom side of packing case.
  • Page 36 27F640 27F641 COPYRIGHT © 2004 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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