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Sharp 26SL72M 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)
(315sq inch)
VOICE COIL IMPEDANCE ............................. 32 ohm at 400 Hz
2
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
26SL72M
(EIA, Channel Plan U.S.A.)
26SL72M
S21P826SL72M
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  • Page 1: Table Of Contents

    26SL72M SERVICE MANUAL S21P826SL72M COLOR TELEVISION Chassis No. SN-012 26SL72M 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

    26SL72M 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 26SL72M 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

    26SL72M LOCATION OF USER'S CONTROL Front Panel anel VIDEO/AUDIO IN 2 TERMINALS – VOL + MENU VIDEO IN 2 L-AUDIO-R (VIDEO/AUDIO terminals are also provided on the rear.) POWER Press Æ On. Press again Æ Off. – VOL + MENU...

  • Page 5: Installation And Service Instructions

    26SL72M 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: Service Mode

    26SL72M 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 26SL72M Below are the adjustments ranges and initial values for FIX VALUE category. FIX VALUE DATA SERVICE ADJUST ITEM INITIAL VALUE POSITION RANGE (Hex) 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 26SL72M 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: Service Adjustment

    26SL72M SERVICE ADJUSTMENT Note: Before making the service adjustment, make the 4. Select the service adjustment "S03" and set the data 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: Mts Adjustment

    26SL72M MTS ADJUSTMENT MTS Level Adjustment Vertical-Size, V-Linearity and V-S Correction Adjustments 1. Feed the following monaural signal to pin (14) of 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

    26SL72M CHASSIS LA Y OUT PWB-B PWB-A P2501(FB) P1401 (HA)

  • Page 12: Block Diagram

    26SL72M BLOCK DIAGRAM...

  • Page 13: Schematic Diagrams

    26SL72M 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 16 26SL72M SCHEMATIC DIAGRAM: CRT Unit...

  • Page 17: Printed Wiring Board Assemblies

    26SL72M PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Unit (Wiring Side)
  • Page 18 26SL72M PWB-A: MAIN Unit (Wiring Side)
  • Page 19 26SL72M PWB-A: MAIN Unit (Chip Parts Side)

  • Page 20: Replacement Parts List

    VTUVTST5UF770 R Tuner 3. PART NO. 4. DESCRIPTION VTUENV56D82-1 in USA: Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll- INTEGRATED CIRCUITS Free; 1-800-BE-SHARP IC201 RH-iX3354CEN1 X I.C. IC351 VHiAN7511//-1 J AN7511...
  • Page 21 26SL72M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV7 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 26SL72M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV7 C701 RC-FZ037SCEZZ J 0.22 AC250V Plastic MAIN UNIT (Continued) RC-FZ012SGEZZ TRANSFORMERS T601 RTRNZ0057PEZZ R Transformer RC-FZ017SGEZZ RTRNZ0731CEZZ RC-FZ029SGEZZ T602 RTRNF0049MEZZ X H-Volt Transformer C702 RC-KZ0029CEZZ J 0.01...
  • Page 23 26SL72M Part No. Description Ref. No. Part No. Description Code Ref. No. Code PWB-A: DUNTKA462WEV7 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 26SL72M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV7 R2041 VRD-RA2BE333J J 33k 1/8W Carbon R2042 VRS-CY1JF101J J 100 1/16W M-Ox. MAIN UNIT (Continued) R2043 VRD-RA2BE101J J 100 1/8W Carbon R2044 VRS-CY1JF683J J 68k 1/16W M-Ox.

  • Page 25: Crt Unit

    26SL72M Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA462WEV7 PWB-B: DUNTK9510WEV1 MAIN UNIT (Continued) CRT UNIT(Continude) MISCELLANEOUS PARTS R857 VRS-VV3LB123J J 12k 3W M-Ox. F701 QFS-B4023CEZZ J Fuse 4A/125V R858 VRD-RM2HD222J J 2.2k 1/2W...

  • Page 26: Cabinet Parts

    QCNW-0132GJZZ X Connecting Cord Not Available – Front Cabinet — QCNW-0104GJZZ X Connecting Cord GCOVA0106GJSA X Cover for R/C QCNW-0105GJZZ X Connecting Cord HBDGB3141CESA X Badge, "SHARP" QCNW-0167MEZZ Connecting Cord JBTN-0106GJSB X Button, Power QCNW-0166MEZZ Connecting Cord MSPRC0005PEFW R Spring for Power Button...

  • Page 27: Packing Of The Set

    26SL72M 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 26SL72M 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.

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