Sharp 20LK32 Service Manual
  1. Manuals
  2. Brands
  3. Sharp Manuals
  4. TV
  5. 20LK32
  6. Service manual
Sharp 20LK32 Service Manual

Sharp 20LK32 Service Manual

Hide thumbs Also See for 20LK32:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Operating Manual
20LK32
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 ............................................................................................................................. 13
» BLOCK DIAGRAM .............................................................................................................................. 15
» SCHEMATIC DIAGRAMS ................................................................................................................... 20
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 28
» REPLACEMENT PARTS LIST ............................................................................................................ 32
» PACKING OF THE SET ...................................................................................................................... 39
POWER INPUT ........................................ 110-220 V AC 50/60 Hz
POWER RATING
20LK32 ................................................................................ 72 W
20LK62 ................................................................................ 79 W
PICTURE SIZE .......................................... 1,194 cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................................... QPF 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
20LK32 ................................... 1.5 + 1.5 W (at 10% distortion)
20LK62 ................................... 3.0 + 3.0 W (at 10% distortion)

SERVICE MANUAL

20LK62
MODELS
CONTENTS
ELECTRICAL SPECIFICATIONS
SPEAKER
2
ANTENNA INPUT IMPEDANCE
TUNING RANGES
(Nominal)

SHARP CORPORATION

1
COLOR TELEVISION
Chassis No. MSA
20LK32
20LK62
SIZE ........................................................... 9 × 5 cm oval (2pcs.)
VOICE COIL IMPEDANCE
20LK32 ....................................................... 32 ohm at 400 Hz
VHF/UHF ..................................................... 75 ohm Unbalanced
VHF-Channels ............................................................... 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels ........................................................... 1 thru 125
Specifications are subject to change without
prior notice.
20LK32
20LK62
S81Z420LK32//
Page

Advertisement

Table of Contents
loading

Related Manuals for Sharp 20LK32

Summary of Contents for Sharp 20LK32

  • Page 1: Table Of Contents

    CATV Channels ............1 thru 125 Color Sub-Carrier Frequency ........42.17 MHz (Nominal) AUDIO POWER Specifications are subject to change without OUTPUT RATING 20LK32 ........1.5 + 1.5 W (at 10% distortion) prior notice. 20LK62 ........3.0 + 3.0 W (at 10% distortion) SHARP CORPORATION...

  • Page 2: Important Service Safety Precaution

    20LK32 20LK62 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

    20LK32 20LK62 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...

  • Page 4: Location Of User's Control

    20LK32 20LK62 LOCATION OF USER'S CONTROL Front Panel (20LK32) VIDEO/AUDIO TERMINALS (VIDEO/AUDIO terminals are also provided on the rear.) (20LK62) VIDEO/AUDIO TERMINALS POWER Press → On. Press again → Off. CHANNEL UP/DOWN (') Selects next higher channel. (") Selects next lower channel.

  • Page 5: Installation And Service Instructions

    20LK32 20LK62 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 3.15A fuse (F701),...
  • Page 6 20LK32 20LK62 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 20LK32 20LK62 SERVICE MODE (1) In the Service Mode, Key is used to select the mode in the following order. AGC & WHITE POINT GEOMETRIC ADJ. ADJ. MODE MODE MODE OFFSET ADJ. MODE FEATURE OPTION OPTION ADJ. MODE MODE MODE AGC &...
  • Page 8 20LK32 20LK62 OFFSET ADJ. ADJ. MODE MODE ↓ ↓ Y-D TIME (TV) [ YD ] (DL-TV) ATTENUATE INPUT SIGNAL LEVEL (ATT) ↓ ↓ Y-D TIME (AV) [ YD ] (DL-AV) VCO FREE RUNNING FREQUENCY ADJ. (VCO) ↓ ↓ INITIAL/DEFAULT LANGUAGE (INIT) STEREO, SAP, DBX FILTER ADJ.

  • Page 9: Service Mode

    20LK32 20LK62 SERVICE MODE DATA SERVICE REMARK ADJUST ITEM POSITION RANGE INITIAL VALUE FIX/ADJ AGC TAKE OVER POINT 0 ~ 63 V-LIN VERTICAL SLOPE 0 ~ 63 V-AMP VERTICAL AMP 0 ~ 63 V-CENT VERTICAL SHIFT 0 ~ 63 V-ZOOM...
  • Page 10 20LK32 20LK62 DATA SERVICE REMARK ADJUST ITEM POSITION RANGE INITIAL VALUE FIX/ADJ FMWS FM WINDOW SELECTION 0(disable) or 1(enable) SOUND MUTE BIT 0 (SM0) 0(disable) or 1(enable) SOUND MUTE BIT 1 0(disable) or 1(enable) AGC0 IF AGC SPEED BIT 0...

  • Page 11: Service Adjustment

    20LK32 20LK62 Ë SERVICE ADJUSTMENT RF AGC Adjustment 1. Receive a good local channel. 2. Enter the service mode signal category and select the service adjustment "AGC". 3. Set the data value to point where no noise or beat appears.
  • Page 12 20LK32 20LK62 CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT No. Adjusting point Adjusting procedure/conditions Waveform and others CRT CUTOFF 1. Switch TV to VIDEO mode, BLUE BACK OFF, with ADJUSTMENT NO VIDEO signal. 3.5Vdc C BUS 2. Press R/C to set Picture Normal condition.

  • Page 13: Chassis Layout

    20LK32 20LK62 MODEL 20LK32 CHASSIS LAYOUT...
  • Page 14 20LK32 20LK62 MODEL 20LK62 CHASSIS LAYOUT...

  • Page 15: Block Diagram

    20LK32 20LK62 BLOCK DIAGRAM-1...
  • Page 16 20LK32 20LK62 MODEL 20LK32 BLOCK DIAGRAM-2...
  • Page 17 20LK32 20LK62 MODEL 20LK62 BLOCK DIAGRAM-2...

  • Page 18: Description Of Schematic Diagram

    20LK32 20LK62 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. (K=k Ω =1000 Ω , M=M Ω ) signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of 2.
  • Page 19 20LK32 20LK62 SCHEMATIC DIAGRAM: CRT Unit...

  • Page 20: Schematic Diagrams

    20LK32 20LK62 MODEL 20LK32 SCHEMATIC DIAGRAM: MAIN Unit...
  • Page 21 20LK32 20LK62 MODEL 20LK62 SCHEMATIC DIAGRAM: MAIN Unit...
  • Page 22 20LK32 20LK62 MODEL 20LK62 SCHEMATIC DIAGRAM: MTS MODULE Unit...

  • Page 23: Printed Wiring Board Assemblies

    20LK32 20LK62 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
  • Page 24 20LK32 20LK62 PWB-A: MAIN Unit (Chip Parts Side)
  • Page 25 20LK32 20LK62 PWB-B: CRT Unit (Wiring Side) PWB-B: CRT Unit (Chip Parts Side)
  • Page 26 20LK32 20LK62 PWB-E: MTS MODULE Unit (Wiring Side) (Only for 20LK62) PWB-E: MTS MODULE Unit (Chip Parts Side) (Only for 20LK62)

  • Page 27: Main Unit

    VHD1SS244//-1 J Diode å D603 RH-EX0667GEZZ J Zener Diode, 27V å D606 RH-DX0131CEZZ J Diode PWB-A DUNTKA541WEA2 – MAIN Unit (20LK32) — å D608 RH-DX0468CEZZ J Diode PWB-A DUNTKA541WEA3 – MAIN Unit (20LK62) — å PWB-B DUNTKA542WEA1 – CRT Unit —...
  • Page 28 20LK32 20LK62 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK541WEA2 (20LK32) C333 VCEA0A1CW108M J 1000 16V EL. (20LK32) AD å PWB-A: DUNTK541WEA3 (20LK62) C333 RC-EZ1086CEZZ J 1000 16V EL. (20LK62) AD å C356 VCKYCY1HB472K J 4700p 50V...
  • Page 29 20LK32 20LK62 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK541WEA2 (20LK32) R219 VRD-RA2BE392J J 3.9k 1/8W Carbon PWB-A: DUNTK541WEA3 (20LK62) R220 VRS-CY1JF221J J 220 1/16W M-Ox. R230 VRS-CY1JF473J J 47k 1/16W M-Ox. MAIN UNIT (Continued)
  • Page 30 VRS-CY1JF221J J 220 1/16W M-Ox. (20LK62) R804 VRS-CY1JF221J J 220 1/16W M-Ox. J409 QJAKF0074CEZZ X Jack, Rear AV-In (20LK32) AG R805 VRS-CY1JF822J J 8.2k 1/16W M-Ox. J409 QJAKG0093CEZZ X Jack, Rear AV-In (20LK62) AK R806 VRS-CY1JF123J J 12k 1/16W M-Ox.

  • Page 31: Crt Unit

    20LK32 20LK62 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTK541WEA2 (20LK32) PWB-B: DUNTK542WEA1 PWB-A: DUNTK541WEA3 (20LK62) CRT UNIT MAIN UNIT (Continued) TRANSISTORS P603 QPLGN0361CEZZ J Plug, 3-pin (TP651-3) P701 QPLGN0260CEZZ J Plug, 2-pin (M)
  • Page 32 20LK32 20LK62 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-E: DUNTK545WEA0 (20LK62) MTS MODULE UNIT INTEGRATED CIRCUITS IC3001 VHiCXA2074Q-1 J CXA2074Q IC3002 VHiMM1501XN-1 X MM1501XNRE TRANSISTORS Q3003 VS2SC3198-G-1 J C3198-G DIODE D3001 RH-EX0632GEZZ J Zener Diode, 9.9V CAPACITORS [EL.

  • Page 33: Packing Parts

    CCABA0139WEH0 X Front Cabinet Ass’y QCNW-2562PEZZ J Connecting Cord Not Available – Front Cabinet — TCAUH0102GJZZ X AV Notice Label (20LK32) GCOVA0110GJSA X Cover for LED, R/C TCAUS3000GJZZ X Caution Card HBDGB1001GJSA X Badge, "SHARP" TLABM0005GJZZ X Model Label JBTN-0114GJSA...

  • Page 34: Packing Of The Set

    20LK32 20LK62 PACKING OF THE SET Polyethylene Bag Operation Manual Infrared R/C Unit Batteries Wrapping Paper Buffer Material FRONT Packing Case Use tape to fix top side of pack case. REAR Use 12 staples fix the packing case. MARK : Not Replacement Items.
  • Page 35 20LK32 20LK62 COPYRIGHT © 2001 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.

This manual is also suitable for:

20lk62

Table of Contents