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LK
20LK31M
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 ..............................................................................................................................12
» SCHEMATIC DIAGRAMS ...................................................................................................................14
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 21
» REPLACEMENT PARTS LIST ...........................................................................................................24
» PACKING OF THE SET ...................................................................................................................... 31
POWER INPUT ........................................ 110-220 V AC 50/60 Hz
POWER RATING
20LK31M ............................................................................ 88 W
20LK61M ............................................................................ 98 W
PICTURE SIZE .......................................... 1,194cm
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
20LK31M ........................................... 1.5W (at 10% distortion)
20LK61M ........................................... 3.0W (at 10% distortion)
SERVICE MANUAL
LK
20LK61M
CONTENTS
ELECTRICAL SPECIFICATIONS
2
(Nominal)
SHARP CORPORATION
1
COLOR TELEVISION
Chassis No. SN-70A
20LK31M
20LK61M
MODELS
SPEAKER
SIZE ........................................................................ 9 cm
VOICE COIL IMPEDANCE
20LK31M ................................................... 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
Specifications are subject to change without
prior notice.
20LK31M
20LK61M
S80G420LK31M/
Page
5 cm
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Related Manuals for Sharp 20LK61M
Summary of Contents for Sharp 20LK61M
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Page 1: Table Of Contents
VOICE COIL IMPEDANCE 20LK61M ................98 W 20LK31M ........... 16 ohm at 400 Hz PICTURE SIZE .......... 1,194cm (185sq inch) 20LK61M ........... 32 ohm at 400 Hz CONVERGENCE ............Magnetic ANTENNA INPUT IMPEDANCE SWEEP DEFLECTION ............ Magnetic VHF/UHF ........... 75 ohm Unbalanced FOCUS .......... -
Page 2: Important Service Safety Precaution
20LK31M 20LK61M IMPORTANT SERVICE SAFETY PRECAUTION Ë Service work should be performed only by qualified service technicians who are throughly 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
20LK31M 20LK61M 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 and etc.) and measure the AC voltage... -
Page 4: Location Of User's Control
20LK31M 20LK61M LOCATION OF USER'S CONTROL Front Panel 20LK31M 20LK61M VIDEO/AUDIO- VIDEO/AUDIO- IN TERMINALS IN TERMINALS CHANNEL UP/DOWN CHANNEL UP/DOWN POWER POWER ) Selects next higher channel. ) Selects next higher channel. Press Press ) Selects next lower channel. ) Selects next lower channel. -
Page 5: Installation And Service Instructions
20LK31M 20LK61M 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. HIGH VOLTAGE CHECK CIRCUIT PROTECTION The receiver is protected by a 4.0A fuse (F701),... - Page 6 20LK31M 20LK61M 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 adjusment is required.
- Page 7 20LK31M 20LK61M Below are the adjustments ranges and initial values for FIX VALUE category. FIX VALUE DATA DATA SERVICE SERVICE ADJUST ITEM ADJUST ITEM INITIAL VALUE (Hex) INITIAL VALUE (Hex) POSITION RANGE POSITION RANGE OPTION 1 00-FF OSD CONT 00-03...
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Page 8: Service Adjustment
20LK31M 20LK61M Ë SERVICE ADJUSTMENT RF AGC Adjustment White Balance Adjustment. 1. Receive a good local channel. 1. Receive a good local channel. 2. Enter the service mode signal category and select 2. Select the service adjustment "S12" and set the data the service adjustment "S01". -
Page 9: Mts Adjustment
20LK31M 20LK61M Ë MTS ADJUSTMENT Vertical-Size, V-Linearity and V-S Correction Adjustments MTS Level Adjustment 1. Feed the following monaural signal to pin (14) of 1. Receive a good local channel. IC3001. 2. Enter the service mode DEF category and select the Monaural signal: 300Hz, 245mVrms adjustment "D02"... -
Page 10: Chassis Layout
20LK31M 20LK61M MODEL 20LK31M CHASSIS LAYOUT PWB-B PWB-C PWB-A... - Page 11 20LK31M 20LK61M MODEL 20LK61M CHASSIS LAYOUT PWB-B PWB-C PWB-A...
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Page 12: Block Diagram
20LK31M 20LK61M MODEL 20LK31M BLOCK DIAGRAM... - Page 13 20LK31M 20LK61M MODEL 20LK61M BLOCK DIAGRAM...
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Page 14: Description Of Schematic Diagram
20LK31M 20LK61M 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=k =1000 , M=M ) wave shapes at the red, green and blue cathodes of 2. - Page 15 20LK31M 20LK61M SCHEMATIC DIAGRAM: CRT and FRONT AV Unit Ë 20LK31M Ë 20LK61M...
- Page 16 20LK31M 20LK61M MODEL 20LK31M SCHEMATIC DIAGRAM: MAIN Unit...
- Page 17 20LK31M 20LK61M MODEL 20LK61M SCHEMATIC DIAGRAM: MAIN-1 Unit...
- Page 18 20LK31M 20LK61M MODEL 20LK61M SCHEMATIC DIAGRAM: MAIN-2 Unit...
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Page 19: Printed Wiring Board Assemblies
20LK31M 20LK61M PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Unit (Wiring Side) PWB-C: FRONT AV Unit (Wiring Side) - Page 20 20LK31M 20LK61M PWB-A: MAIN Unit (Wiring Side)
- Page 21 20LK31M 20LK61M PWB-A: MAIN Unit (Component Side)
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Page 22: Main Unit
PWB-B DUNTK9432WEW1 – CRT Unit — D511 RH-DX0441CEZZ J Diode PWB-C DUNTKA222WEV0 – Front AV Unit (20LK31M) — D601 RH-DX0441CEZZ J Diode PWB-C DUNTKA222WEV2 – Front AV Unit (20LK61M) — RH-DX0110CEZZ D603 RH-DX0441CEZZ J Diode RH-DX0110CEZZ D641 RH-EX0630GEZZ J Zener Diode, 9.1V... - Page 23 Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA221WEV1 (20LK31M) C204 VCQYTA1HM223K J 0.022 50V Mylar PWB-A: DUNTKA221WEV3 (20LK61M) C205 VCKYPA1HB103K J 0.01 Ceramic C206 VCKYCY1HB102K J 1000p 50V Ceramic MAIN UNIT (Continued) C207 VCEA0A1CW476M J 47...
- Page 24 Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA221WEV1 (20LK31M) C3374 VCEA0A1HW225M J 2.2 PWB-A: DUNTKA221WEV3 (20LK61M) (20LK61M) C3376 VCKYCY1HB332K J 3300p 50V Ceramic MAIN UNIT (Continued) (20LK61M) C756 VCEA0A1CW108M J 1000 16V C3377 VCEA0A1HW106M J 10 C757 VCQYTA1HM104K J 0.1...
- Page 25 Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA221WEV1 (20LK31M) R752 VRD-RA2BE562J J 5.6k 1/8W Carbon PWB-A: DUNTKA221WEV3 (20LK61M) R754 VRS-CY1JF471J J 470 1/16W M-Ox. R755 VRS-VV3LB270J J 27 3.0W M-Ox. å MAIN UNIT (Continued) R757 VRD-RA2BE472J J 4.7k 1/8W...
- Page 26 å QFS-B4021GEZZ FB602 RBLN-0037CEZZ J Ferrite Bead FB603 RBLN-0037CEZZ J Ferrite Bead FH701 QFSHD1013CEZZ J Fuse Holder FH702 QFSHD1014CEZZ J Fuse Holder P302 QPLGN0461CEZZ J Plug, 4-pin (S)(20LK31M) P303 QPLGN0461CEZZ J Plug, 4-pin (S)(20LK61M) P401 QPLGN0561CEZZ J Plug, 5-pin (GBN)
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Page 27: Crt Unit
20LK61M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-C: DUNTKA222WEV0 (20LK31M) PWB-B: DUNTK9432WEW1 PWB-C: DUNTKA222WEV2 (20LK61M) CRT UNIT FRONT AV UNIT TRANSISTORS MISCELLANEOUS PARTS Q852 VS2SC2229O/1E J 2SC2229O J1001 QJAKE0150CEZZ J Jack, Video IN Q854... -
Page 28: Packing Parts
HBDGB0019PESB R Badge, "SHARP" JBTN-0002GJSC X Button, Power Vol-up/down, CH-up/down GCABB0002GJKA X Rear Cabinet SUPPLIED ACCESSORIES QANTR0018PEZZ R Rod Antenna RRMCG1339CESB X Infrared R/C Unit RUNTK0165CEZZ J Antenna Adapter TiNS-7056GJZZ X Operation Manual (20LK31M) AL TiNS-7057GJZZ X Operation Manual (20LK61M) AL... -
Page 29: Packing Of The Set
20LK31M 20LK61M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING OF THE SET Polyethylene Bag Operation Manual Infrared R/C Unit Rod Antenna Antenna Adapter Batteries Polyethylene Foam Wrap Buffer Material FRONT Packing Case Use tapes to fix the packing case. -
Page 30: Sharp Corporation
Code Ref. No. Part No. Description Code COPYRIGHT © 2000 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.