Service manual

ManualsBrandsSharp ManualsCRT TV27F641

27F640

27F641

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

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.

COLOR TELEVISION

Chassis No. GB-3U

Page

» 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

CONTENTS

SPEAKER

SIZE ........................................................ 12 x 6 cm oval (2 pcs.)

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

(EIA, Channel Plan U.S.A.)

POWER INPUT ..................................................... 120V AC, 60 Hz

POWER RATING .................................................................. 130W

PICTURE SIZE ....................................... 2,193.5 cm

(339sq inch)

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

(Nominal)

AUDIO POWER

OUTPUT RATING .............. 5.0W + 5.0W (at 10% distortion and

Dual CH Operate)

Specifications are subject to change without

prior notice.

ELECTRICAL SPECIFICATIONS

MODELS

SERVICE MANUAL

27F640

27F641

S14O227F640///

Summary of content (36 pages)

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27F640 27F641 SERVICE MANUAL S14O227F640/// COLOR TELEVISION Chassis No. GB-3U MODELS 27F640 27F641 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. CONTENTS Page » ELECTRICAL SPECIFICATIONS ......................................................................................................... 1 » IMPORTANT SERVICE SAFETY PRECAUTION ....................
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7F640 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 should be attempted. 2. Disconnect AC power before servicing. 3. Semiconductor heat sinks are potential shock hazards when the chassis is operating. 4.
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27F640 27F641 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) • Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC line cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these check.) Any current measured must not exceed 0.
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27F640 27F641 LOCATION OF USER'S CONTROL Front Panel POWER Press → On. Press again → Off. INSIDE DOOR VIDEO/AUDIO IN 2 TERMINALS REMOTE CONTROL SENSOR MENU Press → Accesses MAIN MENU. Press again → Exits MAIN MENU. CHANNEL UP/DOWN ( ) Selects next higher channel ( ) Selects next lower channel VOLUME UP/DOWN ( + ) Increases sound. ( ) Decreases sound. Basic Remote Control Functions POWER Press → On. Press again → Off.
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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 HIGH VOLTAGE CHECK The receiver is protected by a 4.0A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.
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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 service adjustments are required. 1. Service mode To enter the service mode and exit service mode.
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27F640 27F641 A.
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27F640 27F641 SERVICE NUMBER ADJUSTMENT ITEM D14 D15 D18 D19 D20 D21 D22 D23 D24 D25 D26 D27 D28 D29 D30 D31 D32 D33 D34 EW CORNER BOTTOM NOISE DET LEVEL V CENTERING V-AGC V POSITION-VCOMP H POSITION-VCOMP V SIZE-VCOMP H SIZE-VCOMP V-LINEARITY-VCOMP V-C CORRECTION-VCOMP EW PARABOLA-VCOMP EW TRAPEZIUM-VCOMP V EHT-VCOMP H EHT-VCOMP EW CORNER-VCOMP EW CORNER BOTTOM-VCOMP V BLK UPPER-VCOMP V BLK LOWER-VCOMP V CENTERING-VCOMP DATA RANGE NOTES INITIAL VALUE 19-81 (13h-51h) 0-3 (00h-03h) 0-63 (00-3Fh) 0-1 (0
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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. PART REPLACED IC2001 ADJUSTMENT NECESSARY UNNECESSARY X NOTES Data is stored in IC2101. The adjustment is needed to compensate for characteristics of parts including IC201 and MTS level (M01).
PAGE 10
27F640 27F641 Sub-Tint Adjustment 1. Receive the half color bar signal. • RF INPUT (TU51) 2. Get into Y-Mute by R/C, or by setting the "V11" bus data to "01". 3. Vary the "V02" bus data until the waveform becomes as stated below. LEVEL B-AMP Base waveform in step (TP47B) Note: Aging for 10 min before adjustment. After the adjustment of V-center and V-size, readjustment for this V-line. Vertical Phase Adjustment (SCREEN FORMAT 4:3) 1. Enter the service mode and input data of “00h” on "D01". 2.
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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. SETTING VOLTAGE ADJ spec : 490±10mVrms CHK spec: 490±20mVrms Separation Adjustment 1. Input "SIGNAL 1" and vary the "M04" bus data to get the minimun AC voltage to pin (39) of IC3001. 2.
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27F640 27F641 CHASSIS LAYOUT 12
PAGE 13
27F640 27F641 BLOCK DIAGRAM 13
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27F640 27F641 DESCRIPTION OF SCHEMATIC DIAGRAM NOTES: WAVEFORM MEASUREMENT CONDITIONS: 1. The unit of resistance "ohm" is omitted. (K=kW=1000W, M=MW) 2. All resistors are 1/16 watt, unless otherwise noted. 3. All capacitors are µ F, unless otherwise noted. (P=pF=µµF) 4. (G) indicates ±2% tolerance may be used. 5. indicates line isolated ground. 1. Photographs taken on a standard gated color bar signal, the tint setting adjusted for proper color.
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27F640 27F641 SCHEMATIC DIAGRAM: CRT Unit J I H G F E D C B A 1 2 3 4 5 6 15 7 8 9 10
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27F640 27F641 SCHEMATIC DIAGRAM: MAIN-1 Unit J I H G F E D C B A 1 2 3 4 5 6 16 7 8 9 10
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27F640 27F641 10 11 12 13 14 15 17 16 17 18 19
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27F640 27F641 SCHEMATIC DIAGRAM: MAIN-2 Unit J I H G F E D C B A 1 2 3 4 5 6 18 7 8 9 10
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27F640 27F641 10 11 12 13 14 15 19 16 17 18 19
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27F640 27F641 SCHEMATIC DIAGRAM: 3-LINE Y/C Unit J I H G F E D C B A 1 2 3 4 5 6 20 7 8 9 10
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27F640 27F641 10 11 12 13 14 15 21 16 17 18 19
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27F640 27F641 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Components Side) J I H G F E D C B A 1 2 3 4 5 6 22 7 8 9 10
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27F640 27F641 10 11 12 13 14 15 23 16 17 18 19
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27F640 27F641 PWB-A: MAIN Unit (Components side) J I H G F E D C B A 1 2 3 4 5 6 24 7 8 9 10
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27F640 27F641 10 11 12 13 14 15 25 16 17 18 19
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27F640 27F641 J I H G F E PWB-B: CRT Unit (Wiring Side) D C B PWB-C: 3-LINE Y/C Unit (Wiring Side) A 1 2 3 4 PWB-C: 3-LINE Y/C Unit (Chip Parts Side) 5 6 26 7 8 9 10
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F640 27F641 Ref. No. Part No. ★ Description Code Ref. No. PARTS LIST PARTS REPLACEMENT 2. REF. NO. 4. DESCRIPTION Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll-Free; 1800-BE-SHARP ★ MARK: SPARE PARTS-DELIVERY SECTION ' Ref. No. MARK: X-RAY RELATED PARTS Part No.
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27F640 27F641 Ref. No. Part No.
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27F640 27F641 Ref. No. Part No.
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27F640 27F641 Ref. No. C3004 C3005 C3006 C3007 C3008 C3009 C3010 C3011 C3012 C3013 C3014 C3015 C3016 C3017 C3018 C3021 C3022 C3025 C3027 C3028 C3029 ★ Part No.
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27F640 27F641 Ref. No. R652 R653 R658 R663 R670 R684 R685 R686 R687 å R688 R689 å R690 R691 R692 R693 R694 R695 R696 R697 R698 å R701 å R703 å R705 å R706 R707 R708 R709 å R710 R711 R712 å R713 R714 R715 R716 R720 R724 R725 R734 å R737 R742 R743 R744 R745 R750 R751 R752 R753 R754 R755 R756 å R757 R759 R761 R762 R764 R767 R768 R775 R776 R801 R802 R803 R805 R806 R942 R943 R944 R945 R946 R947 R948 R949 R950 R951 R952 R953 çå çå å Part No.
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27F640 27F641 Ref. No. ★ Part No.
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27F640 27F641 Ref. No. R867 R868 R869 R870 R871 R872 R873 R874 R875 R876 R877 å R878 R1511 å R1513 R1514 R1515 R1516 R1517 R1518 R1519 R1520 R1521 R1525 R1526 R1527 R1528 å R1529 R1530 å å ★ Part No.
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27F640 27F641 Ref. No. Part No. ★ Description Code Ref. No. VSP1206PB708A VSP1206PB708A QCNW-B020WJZZ QCNW-B021WJZZ QCNW-B022WJZZ X X X X X Speaker (L) Speaker (R) Connecting Cord Connecting Cord Connecting Cord ★ Description Code PACKING PARTS (NOT REPLACEMENT ITEM) MISCELLANEOUS PARTS SP1 SP2 Part No.
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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. ★ MARK : Not replacement items.
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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. TQ1702-S Jan. 2004 Printed in Japan In Japan gedruckt Design and Production Information Design : JAPAN Production : SEMEX MY.