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Sharp 29MR70 Service Manual

Chassis no. sn-010
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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 ........................................................................................ 18
REPLACEMENT PARTS LIST ............................................................................................................ 23
PACKING OF THE SET ...................................................................................................................... 31
POWER INPUT .................................................... 120 V AC 60 Hz
POWER RATING ................................................................. 105 W
PICTURE SIZE ........................................... 2,187cm
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 ..................... 1.5W + 1.5W (at 10% distortion
SHARP CORPORATION
SERVICE MANUAL
MODEL
CONTENTS
ELECTRICAL SPECIFICATIONS
SPEAKER
2
(339sq inch)
ANTENNA INPUT IMPEDANCE
TUNING RANGES
(Nominal)
and Dual CH Operate)
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-010
29MR70
SIZE ...................................................................... 8 cm (Round)
VOICE COIL IMPEDANCE ............................ 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.
29MR70
S21O629MR70/
Page
(EIA, Channel Plan U.S.A.)

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Summary of Contents for Sharp 29MR70

  • Page 1: Table Of Contents

    29MR70 SERVICE MANUAL S21O629MR70/ COLOR TELEVISION Chassis No. SN-010 29MR70 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

    29MR70 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 29MR70 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 and etc.) and measure the AC voltage Before returning the receiver to the user, perform drop across the resistor.

  • Page 5: Installation And Service Instructions

    29MR70 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 29MR70 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 29MR70 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 29MR70 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 29MR70 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 29MR70 Vertical-Size, V-Linearity and MTS ADJUSTMENT V-S Correction Adjustments MTS Level Adjustment 1.- Receive a good local channel. 1.- Feed the following monaural signal to pin (14) of 2.- Enter the service mode DEF category and select the IC3001. adjustment “D02” for Vertical Size, “D05”...

  • Page 11: Chassis Layout

    29MR70 CHASSIS LAYOUT...

  • Page 12: Block Diagram

    29MR70 BLOCK DIAGRAM...
  • Page 13 29MR70 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 29MR70 SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 15 29MR70 SCHEMATIC DIAGRAM: MAIN-2 Unit...
  • Page 16 29MR70 SCHEMATIC DIAGRAM: CRT and FRONT A/V Unit...
  • Page 17 29MR70 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
  • Page 18 29MR70 PWB-A: MAIN Unit (Chip Parts Side)

  • Page 19: Printed Wiring Board Assemblies

    J PC817 3. PART NO. 4. DESCRIPTION RH-FX0002GEZZ in USA: Contact your nearest SHARP Parts Distributor to order. RH-FX0029CEZZ For location of SHARP Parts Distributor, Please call Toll- IC751 VHiKA7809AP-1 J KIA7809API Free; 1-800-BE-SHARP IC771 VHiKA7805AP-1 J KIA7805API VHiTA7805S/-1 IC1401...
  • Page 20 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV4 D717 RH-EX0616GEZZ J Zener Diode, 5.6V D725 RH-DX0131CEZZ J Diode MAIN UNIT (Continued) D726 VHD1SS119//-1 J Diode Q752 VS2SC3198-Y-1 J 2SC3198-Y RH-DX0475CEZZ D732 VHD1SS119//-1 J Diode...
  • Page 21 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code RC-KZ0106GEZZ PWB-A: DUNTKA450WEV4 MAIN UNIT (Continued) RC-KZ0311CEZZ C710 VCKYPH3DB561K J 560p 2kV Ceramic C302 VCKYCY1HB102K J 1000p 50V Ceramic RC-KZ0338CEZZ C304 VCCCCY1HH220J J 22p Ceramic C717 VCKYPA2HB472K...
  • Page 22 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R431 VRD-RA2BE272J J 2.7k 1/8W Carbon PWB-A: DUNTKA450WEV4 R432 VRD-RA2BE472J J 4.7k 1/8W Carbon MAIN UNIT (Continued) R451 VRS-RG2HC103J J 10k 1/2W M-Ox. R453 VRD-RA2BE152J J 1.5k 1/8W...
  • Page 23 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV4 R2201 VRS-CY1JF103J J 10k 1/16W M-Ox. R2202 VRS-CY1JF473J J 47k 1/16W M-Ox. MAIN UNIT (Continued) R2203 VRS-CY1JF332J J 3.3k 1/16W M-Ox. R2211 VRS-CY1JF222J J 2.2k 1/16W M-Ox.
  • Page 24 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV4 PWB-B: DUNTK9510WEV1 MAIN UNIT (Continued) CRT UNIT TRANSISTORS FB751 RBLN-0047CEZZ J Ferrite Bead Q851 VS2SC3198-Y-1 J 2SC3198(Y) FH701 QFSHD1013CEZZ J Fuse Holder Q852 VS2SC3789//2E J 2SC3789...
  • Page 25 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-H: DUNTK9310WEV4 SUPPLIED ACCESSORIES FRONT A/V UNIT MISCELLANEOUS PARTS RRMCG1573CESA M Infrared R/C Unit J1001 QJAKE0053GEZZ J Jack, Video-In TiNS-7391GJZZ X Operation Manual J1002 QJAKE0055GEZZ J Jack, Audio-In (L)
  • Page 26 CABINET PARTS LOCATION CCABA1311WEV1 X Front Cabinet Ass'y Not Available – Front Cabinet — GCOVA1033MEKA X Cover for R/C HBDGB1009MESB X "SHARP" Badge JBTN-1101MEKB X Button, Power , Vol-up/down AG JBTN-1102MEKB X Button, CH-up/down 1 1-1 GCABB1144MEKA X Rear Cabinet...
  • Page 27 J PC817 3. PART NO. 4. DESCRIPTION RH-FX0002GEZZ in USA: Contact your nearest SHARP Parts Distributor to order. RH-FX0029CEZZ For location of SHARP Parts Distributor, Please call Toll- IC751 VHiKA7809AP-1 J KIA7809API Free; 1-800-BE-SHARP IC771 VHiKA7805AP-1 J KIA7805API VHiTA7805S/-1 IC1401...
  • Page 28 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV4 D717 RH-EX0616GEZZ J Zener Diode, 5.6V D725 RH-DX0131CEZZ J Diode MAIN UNIT (Continued) D726 VHD1SS119//-1 J Diode Q752 VS2SC3198-Y-1 J 2SC3198-Y RH-DX0475CEZZ D732 VHD1SS119//-1 J Diode...
  • Page 29 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code RC-KZ0106GEZZ PWB-A: DUNTKA450WEV4 MAIN UNIT (Continued) RC-KZ0311CEZZ C710 VCKYPH3DB561K J 560p 2kV Ceramic C302 VCKYCY1HB102K J 1000p 50V Ceramic RC-KZ0338CEZZ C304 VCCCCY1HH220J J 22p Ceramic C717 VCKYPA2HB472K...
  • Page 30 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R431 VRD-RA2BE272J J 2.7k 1/8W Carbon PWB-A: DUNTKA450WEV4 R432 VRD-RA2BE472J J 4.7k 1/8W Carbon MAIN UNIT (Continued) R451 VRS-RG2HC103J J 10k 1/2W M-Ox. R453 VRD-RA2BE152J J 1.5k 1/8W...
  • Page 31 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV4 R2201 VRS-CY1JF103J J 10k 1/16W M-Ox. R2202 VRS-CY1JF473J J 47k 1/16W M-Ox. MAIN UNIT (Continued) R2203 VRS-CY1JF332J J 3.3k 1/16W M-Ox. R2211 VRS-CY1JF222J J 2.2k 1/16W M-Ox.
  • Page 32 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV4 PWB-B: DUNTK9510WEV1 MAIN UNIT (Continued) CRT UNIT TRANSISTORS FB751 RBLN-0047CEZZ J Ferrite Bead Q851 VS2SC3198-Y-1 J 2SC3198(Y) FH701 QFSHD1013CEZZ J Fuse Holder Q852 VS2SC3789//2E J 2SC3789...
  • Page 33 29MR70 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-H: DUNTK9310WEV4 SUPPLIED ACCESSORIES FRONT A/V UNIT MISCELLANEOUS PARTS RRMCG1573CESA M Infrared R/C Unit J1001 QJAKE0053GEZZ J Jack, Video-In TiNS-7391GJZZ X Operation Manual J1002 QJAKE0055GEZZ J Jack, Audio-In (L)
  • Page 34 CABINET PARTS LOCATION CCABA1311WEV1 X Front Cabinet Ass'y Not Available – Front Cabinet — GCOVA1033MEKA X Cover for R/C HBDGB1009MESB X "SHARP" Badge JBTN-1101MEKB X Button, Power , Vol-up/down AG JBTN-1102MEKB X Button, CH-up/down 1 1-1 GCABB1144MEKA X Rear Cabinet...

  • Page 35: Packing Of The Set

    29MR70 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. Bar Code Label REAR Use 12 staples to fix the bottom side of packing case.
  • Page 36 29MR70 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.