Service manual

ManualsBrandsSharp ManualsCRT TV32C241

32C240

32C241

SHARP CORPORATION

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 (1W)

SERVICE MANUAL

S24O932C240//

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

» ELECTRICAL SPECIFICATIONS .........................................................................................................1

» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2

» LOCATION OF USER'S CONTROL .....................................................................................................4

» INSTALLATION AND SERVICE INSTRUCTIONS................................................................................6

» SERVICE ADJUSTMENT ...................................................................................................................10

» CHASSIS LAYOUT .............................................................................................................................12

» BLOCK DIAGRAM ..............................................................................................................................13

» DESCRIPTION OF SCHEMATIC DIAGRAM & WAVEFORMS ..........................................................14

» SCHEMATIC DIAGRAMS ...................................................................................................................15

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................22

» REPLACEMENT PARTS LIST ............................................................................................................25

» PACKING OF THE SET ......................................................................................................................33

CONTENTS

SPEAKER

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

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

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

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

POWER RATING .................................................................. 135W

PICTURE SIZE .......................................... 3,073 cm

(476sq 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 .............. 3.0W + 3.0W (at 10% distortion and

Dual CH Operate)

Specifications are subject to change without

prior notice.

ELECTRICAL SPECIFICATIONS

MODELS

32C240

32C241

32C24132C240

Summary of content (34 pages)

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32C240 32C241 SERVICE MANUAL S24O932C240// COLOR TELEVISION Chassis No. GB-3U (1W) 32C240 32C241 MODELS 32C240 32C241 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 .........................................................................................................
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32C240 32C241 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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2C240 32C241 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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32C240 32C241 LOCATION OF USER'S CONTROL (32C240) Front Panel Front Panel VIDEO/AUDIO IN 2 TERMINALS POWER Press → On. POWER Press again → Off. Press → On. Press again → Off. REMOTE CONTR SENSOR MENU MENU Press Press → → Accesses Accesses MAIN MAIN MENU. MENU. Press → Exits Exits MAIN MAIN MENU. MENU. Press again again → VIDEO/AUDIO IN 2 TERMINALS CHANNEL UP/DOWN (') Selects next higher channel. (") Selects next lower channel. VOLUME UP/DOWN ( + ) Increases sound. CONTROL (REMOTE ) Decreases sound.
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32C240 32C241 LOCATION OF USER'S CONTROL (32C241) VIDEO/AUDIO IN 2 TERMINALS Front Panel POWER Press On. Press again CHANNEL UP/DOWN ( ') Selects next higher channel. ( ") Selects next lower channel. Off. MENU Press Accesses MAIN MENU. Press again Exits MAIN MENU. REMOTE CONTROL SENSOR VOLUME UP/DOWN ( + ) Increases sound. ( ) Decreases sound. Basic Remote Control Functions Infrared Transmitter Window POWER Press On.
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32C240 32C241 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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32C240 32C241 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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32C240 32C241 A.
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32C240 32C241 B. SPECIAL SETTING SERVICE NUMBER EX1 EX2 EX3 EX4 EX5 EX6 EX7 EX8 DATA ADJUSTMENT ITEM RANGE FAO VOLUME CC-POSITION INT A-ATT TUNER data Think chip-Slice LEVEL RLY DELAY TIME ADG ON TIME NOTES FIXED VALUE (HEX) INITIAL VALUE 0-50 (00h-32h) 0-127 (00h-7Fh) 0-255 (00h-FFh) 0-127 (00h-7Fh) 0-3 (00h-03h) 0-255 (00h-FFh) 0-255 (00h-FFh) 0-255 (00h-FFh) 36 (24h) 27 (1Bh) 122 (7Ah) 90 (5Ah) 0 (00h) 54 (36h) 0 (00h) 10 (0Ah) 24 Interrupt period adjustment.
PAGE 10
32C240 32C241 SERVICE ADJUSTMENT RF AGC Adjustment White Balance Adjustment 1. Receive a good local channel. 2. Enter the service mode and select the service adjustment "R01". 3. Set the data value to point where no noise or beat appears. 4. Select another channel to confirm that no noise or beat appears. Note 1 : You will have to come out of the service mode to select another channel. Note 2 : Setting the data to "00" will produce a black raster. 1. Receive a good local channel. 2.
PAGE 11
32C240 32C241 Sub-Tint Adjustment Vertical Phase 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. 1. Enter the service mode and input "D01" data value to "00h". 2. Adjust "D18" data value so that picture is centered. LEVEL Horizontal Position Adjustment 1. Receive a good local channel. 2.
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32C240 32C241 CHASSIS LAYOUT H G F E D C B A 1 2 3 4 12 5 6
PAGE 13
32C240 32C241 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 13 5 6
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32C240 32C241 DESCRIPTION OF SCHEMATIC DIAGRAM NOTES: WAVEFORM MEASUREMENT CONDITIONS: 1. The unit of resistance "ohm" is omitted. (K=kΩ=1000Ω, M=MΩ) 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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32C240 32C241 SCHEMATIC DIAGRAMS H CRT UNIT G F E D C B A 1 2 3 4 15 5 6
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32C240 32C241 MAIN-1 UNIT H G F E D C B A 1 2 3 4 5 6 16 7 8 9 10
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32C240 32C241 10 11 12 13 14 15 17 16 17 18 19
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32C240 32C241 MAIN-2 UNIT H G F E D C B A 1 2 3 4 5 6 18 7 8 9 10
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32C240 32C241 10 11 12 13 14 15 19 16 17 18 19
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32C240 32C241 2 LINE Y/C UNIT H G F E D C B A 1 2 3 4 5 6 20 7 8 9 10
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32C240 32C241 10 11 12 13 14 15 21 16 17 18 19
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32C240 32C241 PRINTED WIRING BOARD ASSEMBLIES H G F E D C B A PWB-A: MAIN Unit (A Side) 1 2 3 4 22 5 6
PAGE 23
32C240 32C241 H G F E D C B A PWB-A: MAIN Unit (B Side) 1 2 3 4 23 5 6
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32C240 32C241 H G F E PWB-B: CRT Unit (Wiring Side) D C B A PWB-D: 2 LINE Y/C Unit (Wiring Side) 1 2 PWB-D: 2 LINE Y/C Unit (Chip Parts Side) 3 4 24 5 6
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32C240 32C241 Ref. No. Part No. ★ Description Code Ref. No. PARTS LIST PARTS REPLACEMENT å 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.
PAGE 26
32C240 32C241 Ref. No. D651 D652 D653 D654 D673 D701 D706 D707 D708 å D709 D710 D711 D712 D725 D726 D746 D751 D752 D753 D754 D755 D756 D757 D759 D761 D763 D767 D904 D905 D906 D907 D908 D909 D2001 D2040 D2041 D2042 D2060 TH501 å VA701 'å 'å 'å 'å å å Part No.
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32C240 32C241 Ref. No. Part No.
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32C240 32C241 Ref. No. RJ7 RJ8 RJ9 RJ10 RJ11 RJ12 RJ14 RJ15 RJ16 RJ17 RJ19 RJ20 RJ21 RJ22 RJ23 RJ24 RJ25 RJ30 RJ33 RJ36 RJ38 RJ39 RJ40 RJ42 RJ45 RJ47 RJ48 RJ49 RJ50 R54 R55 R56 R57 R201 R202 R203 R204 R205 R206 R211 R212 R225 R226 R227 R232 R234 R236 R301 R305 R306 R307 R308 R355 R361 R362 R363 R364 R365 R368 R369 R371 R372 R403 R404 R406 R407 R408 R410 R411 R412 R413 R422 R430 R431 R432 R436 Part No.
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32C240 32C241 Ref. No. R698 R703 R705 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 R807 R808 R810 R924 R925 R926 R927 R929 R930 R931 R932 R933 R934 R935 R936 R937 R938 R939 R940 R941 R942 R943 R944 R945 R946 R947 R948 R949 R950 R951 R952 R953 å å å Part No.
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32C240 32C241 Ref. No. R2503 R2504 R2505 R2506 R2507 R2508 R2509 R2601 R2603 R2605 R2606 R3001 R3002 R3003 R3004 R3005 R3007 R3008 R3010 R3017 R3018 R3019 R3024 Part No.
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32C240 32C241 Ref. No. R884 R885 R886 R887 R888 R890 R891 R892 R894 R895 R899 ★ Part No. VRD-RA2BE221JY VRD-RA2BE221JY VRD-RA2BE471JY VRD-RA2BE471JY VRD-RA2BE471JY VRD-RA2BE562JY VRD-RA2BE102GY VRD-RA2BE331GY VRD-RA2BE152JY VRD-RA2EE561JY VRD-RA2BE222JY X X X X X X X X X X X Description 220 220 470 470 470 5.6k 1k 330 1.5k 560 2.2k 1/8W 1/8W 1/8W 1/8W 1/8W 1/8W 1/8W 1/8W 1/8W 1/4W 1/8W Carbon Carbon Carbon Carbon Carbon Carbon Carbon Carbon Carbon Carbon Carbon Code Ref. No.
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C240 32C241 Ref. No. Part No. ★ Description Code Ref. No.
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32C240 32C241 PACKING OF THE SET ★ Polyethylene Bag Operation Manual Infrared R/C Unit ★ Batteries ★ Polyethylene Mat ★Buffer Material FRONT ★ Packing Case Use tape to fix the top side of packing case. ★ Packing Case Label REAR Use 12 staples to fix the bottom side of packing case. ★ MARK : Not replacement items.
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32C240 32C241 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. TQ1705-S Feb.