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Sharp 26MR70 Service Manual
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Sharp 26MR70 Service Manual

Sharp 26MR70 Service Manual

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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 ............................................................................................................................ 11
BLOCK DIAGRAM ............................................................................................................................. 12
SCHEMATIC DIAGRAMS .................................................................................................................. 13
PRINTED WIRING BOARD ASSEMBLIES ....................................................................................... 19
REPLACEMENT PARTS LIST ........................................................................................................... 22
PACKING OF THE SET ..................................................................................................................... 29
POWER INPUT ..................................................... 120 V AC 60 Hz
POWER RATING .................................................................. 100 W
PICTURE SIZE ........................................... 2,032cm
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 ..................... 1.5 W+1.5 W (at 10% distortion and
SHARP CORPORATION
SERVICE MANUAL
MODEL
CONTENTS
ELECTRICAL SPECIFICATIONS
SPEAKER
SIZE ...................................................................... 8 cm (Round)
2
(315sq inch)
VOICE COIL IMPEDANCE ............................. 32 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
(Nominal)
Dual CH Operate)
Specifications are subject to change without
prior notice.
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
COLOR TELEVISION
Chassis No. SN-012
26MR70
(EIA, Channel Plan U.S.A.)
26MR70
S21P826MR70
Page

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Summary of Contents for Sharp 26MR70

  • Page 1: Table Of Contents

    26MR70 SERVICE MANUAL S21P826MR70 COLOR TELEVISION Chassis No. SN-012 26MR70 MODEL 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 2: Important Service Safety Precaution

    26MR70 IMPORTANT SERVICE SAFETY PRECAUTION 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 26MR70 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) BEFORE RETURNING THE RECEIVER Connect the resistor connection to all exposed metal 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 Before returning the receiver to the user, perform across the resistor.

  • Page 4: Location Of User's Control

    26MR70 LOCATION OF USER'S CONTROL Front Panel Front Panel POWER VIDEO/AUDIO IN2 TERMINALS Press Æ Press again Off. Æ SENSOR AREA FOR REMOTE CONTROL CHANNEL UP/DOWN MENU ( ) Selects next higher channel. Press Accesses MAIN MENU. Æ VOLUME UP/DOWN ( ) Selects next lower channel.

  • Page 5: Installation And Service Instructions

    26MR70 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...
  • Page 6 26MR70 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 26MR70 Below are the adjustments ranges and initial values for FIX VALUE category. FIX VALUE DATA SERVICE ADJUST ITEM INITIAL VALUE (Hex) POSITION RANGE OPTION 1 00-FF OPTION 2 00-FF E-SAVE 00-3F TUNER SETUP 00, 01 R-TONE RD 00-7F R-TONE BD...
  • Page 8 26MR70 SIGNAL DATA SERVICE ADJUSTMENT CONTENTS ADJUST ITEM POSITION INITIAL VALUE RANGE RF AGC 00-3F VIDEO LEVEL 00-07 "01": Y-MUTE, "02": V-STOP & Y-MUTE Y-MUTE 00-03 "03": Activate color killer circuit. SUB BIAS 00-FF Must be "30" R-BIAS 00-FF G-BIAS...
  • Page 9 26MR70 SERVICE ADJUSTMENT 4. Select the service adjustment "S03" and set the data Note: Before making the service adjustment, make the value to "01" to turn off the luminance signal (Y-mute). bus data settings. +B Adjustment 5. Select the service adjustment "S13” and adjust the data value to obtain 2.35 volts as shown in Figure B.
  • Page 10 26MR70 MTS ADJUSTMENT Vertical-Size, V-Linearity and MTS Level Adjustment 1. Feed the following monaural signal to pin (14) of V-S Correction Adjustments IC3001. 1. Receive a good local channel. Monaural signal: 300Hz, 245mVrms 2. Enter the service mode DEF category and select the 2.

  • Page 11: Chassis Layout

    26MR70 CHASSIS LAYOUT PWB-B PWB-A...

  • Page 12: Block Diagram

    26MR70 BLOCK DIAGRAM...
  • Page 13 26MR70 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 14 26MR70 SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 15 26MR70 SCHEMATIC DIAGRAM: MAIN-2 Unit...
  • Page 16 26MR70 SCHEMATIC DIAGRAM: CRT Unit...

  • Page 17: Printed Wiring Board Assemblies

    26MR70 PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Unit (Wiring Side)
  • Page 18 26MR70 PWB-A: MAIN Unit (Wiring Side)
  • Page 19 26MR70 PWB-A: MAIN Unit (Chip Parts Side)
  • Page 20 X Tuner 3. PART NO. 4. DESCRIPTION VTUENV56DA1G3 in USA: Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll- Free; 1-800-BE-SHARP INTEGRATED CIRCUITS MARK: SPARE PARTS-DELIVERY SECTION IC201 RH-iX3354CEN1 X I.C. IC351 VHiAN7511//-1...
  • Page 21 26MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV6 D703 RH-DX0154CEZZ J Diode MAIN UNIT (Continued) RH-DX0490CEZZ Q701 VSSPP07N60C-1 X FET RH-DX0279CEZZ D704 RH-DX0154CEZZ J Diode VSSPP07N60S-1 RH-DX0490CEZZ VSSPP04N60C-1 RH-DX0279CEZZ VS2SK2708//1E D707 VHD1SS119//-1 J Diode...
  • Page 22 26MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV6 C653 VCEA0A1HW105M J 1.0 MAIN UNIT (Continued) C654 VCFYSA1HB184J J 0.18 Mylar C662 VCEA0A1CW477M J 470 TRANSFORMERS C701 RC-FZ037SCEZZ J 0.22 AC250V Plastic T601 RTRNZ0057PEZZ...
  • Page 23 26MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV6 R211 VRS-CY1JF104J J 100k 1/16W M-Ox. R212 VRS-CY1JF000J 1/16W M-Ox. MAIN UNIT (Continued) R220 VRS-CY1JF331J J 330 1/16W M-Ox. R301 VRS-CY1JF102J J 1.0k 1/16W M-Ox.
  • Page 24 26MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV6 R2041 VRD-RA2BE333J J 33k 1/8W Carbon R2042 VRS-CY1JF101J 100 1/16W M-Ox. MAIN UNIT (Continued) R2043 VRD-RA2BE101J J 100 1/8W Carbon R2044 VRS-CY1JF683J 68k 1/16W M-Ox.
  • Page 25 26MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV6 PWB-B: DUNTK9510WEV1 MAIN UNIT (Continued) CRT UNIT TRANSISTORS S2503 QSW-K0202PEZZ R VOL-Up Q851 VS2SC3198-Y-1 J 2SC3198-Y QSW-K0079GEZZ Q852 VS2SC3789//2E J 2SC3789 S2504 QSW-K0202PEZZ R CH-Down...
  • Page 26 Not Available – Front Cabinet — VSP0080PBQ4YA X Speaker x2, 32 ohm GCOVA0109GJKA X Cover for R/C QCNW-0134MEZZ X Connecting Cord HBDGB1008MESB X Badge, "SHARP" QCNW-0166MEZZ X Connecting Cord JBTN-0109GJKB X Button (Power) QCNW-0167MEZZ J Connecting Cord JBTN-0110GJKB X Button (Vol-up/down,...

  • Page 27: Packing Of The Set

    26MR70 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 Bar Code Label Use 12 staples to fix the bottom side of packing case.
  • Page 28 26MR70 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.