Service manual

ManualsBrandsSharp ManualsTV20MR10M

COLOR TELEVISION

Chassis No. CD-A

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

»CHASSIS LAYOUT............................................................................................................................10

»BLOCK DIAGRAM.............................................................................................................................11

»SCHEMATIC DIAGRAMS..................................................................................................................12

»PRINTED WIRING BOARD ASSEMBLIES........................................................................................15

»REPLACEMENT PARTS LIST...........................................................................................................18

»PACKING OF THE SET.....................................................................................................................23

Page

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

CONTENTS

SERVICE MANUAL

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

POWER RATING .............................................69 W

PICTURE SIZE.......................1,194cm

2 (185sq 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)

ELECTRICAL SPECIFICATIONS

AUDIO POWER

OUTPUT RATING...........1.0 W (at 10% distortion)

SPEAKER

SIZE .................................................. 8 cm (Round)

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.)

Specifications are subject to change without

prior notice.

MODELS

20MR10M

Summary of content (22 pages)

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20MR10M SERVICE MANUAL COLOR TELEVISION Chassis No. CD-A MODELS 20MR10M 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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0MR10M 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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20MR10M IMPORTANT SERVICE SAFETY PRECAUTION (Continued) BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard) Before returning the receiver to the user, perform the following safety checks. 1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the receiver. 2.
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20MR10M LOCATION OF USER'S CONTROL 4
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20MR10M 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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20MR10M 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 Before putting unit into the service mode, check that customer adjustments are in the normal mode.
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20MR10M SERVICE MODE (1) In the Service Mode, Key is used to select the mode in the following oreder. AGC & GEOMETRIC MODE WHITE POINT ADJ. MODE SUB ADJ. MODE FEATURE OPTION MODE IC OPTION MODE OFFSET ADJ. MODE AGC & GEOMETRIC MODE WHITE POINT ADJ.
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20MR10M OFFSET ADJ.
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20MR10M SERVICE MODE DATA SERVICE POSITION ADJUST ITEM AGC V-LIN V-AMP V-CENT V-ZOOM H-CENT H-SIZE EW// PARA COR(U) COR(L) TRAPE HB S-COR DRI-R-HI DRI-G-HI DRI-B-HI DRI-R-MH DRI-G-MH DRI-B-MH DRI-R-ML DRI-G-ML DRI-B-ML DRI-R-LO DRI-G-LO DRI-B-LO SUB-VOL SUB-CON SUB-COL SUB-BRI SUB-TINT SUB-SHP HTL-VOL HTL-PRG BB-CON RGB CUT-R CUT-G CDL DL-TV DL-AV INIT AGC TAKE OVER POINT VERTICAL SLOPE VERTICAL AMP VERTICAL SHIFT VERTICAL ZOOM HORIZONTAL SHIFT EAST-WEST WIDTH HORIZONTAL PARALLELOGRAM EAST-WEST PARABOL
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20MR10M SERVICE POSITION DATA ADJUST ITEM FMWS SM0 SM1 AGC0 AGC1 FOA-FE FOB-FE FOA-AV FOB-AV FSL HP2 RGBL V-CHIP FM WINDOW SELECTION SOUND MUTE BIT 0 (SM0) SOUND MUTE BIT 1 IF AGC SPEED BIT 0 IF AGC SPEED BIT 1 PHI 1 TIME CONSTANT FOR FE PHI 1 TIME CONSTANT FOR FE PHI 1 TIME CONSTANT FOR AV PHI 1 TIME CONSTANT FOR AV FORCED SLICING LEVEL FOR VERTICAL SYNC.
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20MR10M Ë SERVICE ADJUSTMENT VCO Adjustment White Balance Adjustment 1. Connect a digital voltmeter between pin (44) of IC201 and ground. 2. Receive a good local channel. 3. Enter the service mode and select the service adjustment "S10". 4. Adjust the data so that digital voltmeter reads 2.2V. 5. Adjustment is completed, remove the voltmeter, return to "normal" mode. 1. Receive a good local channel. 2.
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20MR10M DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: 1. Photographs taken on a standard gated color bar signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of the picture tube depend on the tint, color level and picture control. 2. indicates waveform check points (See chart, waveforms are measured from point indicated to chassis ground.) NOTES: 1. The unit of resistance "ohm" is omitted. (K=kΩ=1000Ω, M=MΩ) 2.
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20MR10M SCHEMATIC DIAGRAM: MAIN-1 Unit H G F E D C B A 1 2 3 4 6 5 13 7 8 9 10
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20MR10M 10 11 12 13 14 15 14 16 17 18 19
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20MR10M SCHEMATIC DIAGRAM: CRT Unit H G F E D C B A 1 2 3 4 15 5 6
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20MR10M « Ref. No. Part No. PARTS LIST MAIN UNIT TUNER NOTE:THE PARTS HERE SHOWN ARE SUPPLIED AS AN ASSEMBLY BUT NOT INDEPENDETLY Replacement parts which have these special safety characteristics identified in this manual; electrical components having such features are identified by å and shaded areas in the Replacement Parts Lists and Schematic Diagrams.
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20MR10M « Ref. No. Part No.
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20MR10M « Ref. No. Part No. Description Code Ref. No. Part No.
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20MR10M Ref. No. « Part No. Description Code Ref. No. MAIN UNIT C871 C872 C873 C875 C876 C878 C880 C881 C882 C886 RESISTORS [M-Ox.
PAGE 20
MR10M Ref. No. Part No. « Description Code Ref. No. SUPPLIED ACCESORRIES RRMCG1339CESB TINS-B821WJZZ TCAUS3000GJZZ X X X Infrared R-C Unit operation manual Caution label « Part No.
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20MR10M PACKING OF THE SET ★ Polyethylene Bag Operation Manual Infrared R/C Unit ★ Batteries ★ Wrapping Paper ★ Buffer Material FRONT ★ Packing Case Use tape to fix the top side of packing case. REAR Use 10 staples to fix the bottom side of packing case. ★ MARK : Not replacement items.
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20MR10M 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. QRC0010-L Jan. 2005 Modify : SEMEX Design and Production Information Design base : JAPAN Production : SEMEX JB SHARP ELECTRONICA MEXICO S. A. DE C. V. Quality & Reliability Control Center Blvd. SHARP No.