Sharp 27R-S50 Service Manual
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Sharp 27R-S50 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 ........................................................................................ 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
27R-S50
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.
27R-S50
S21O627R-S50/
Page
(EIA, Channel Plan U.S.A.)

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  • Page 1: Table Of Contents

    27R-S50 SERVICE MANUAL S21O627R-S50/ COLOR TELEVISION Chassis No. SN-010 27R-S50 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

    27R-S50 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

    27R-S50 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 Before returning the receiver to the user, perform drop across the resistor.

  • Page 4: Location Of User's Control

    27R-S50 LOCATION OF USER'S CONTROL Front Panel VIDEO/AUDIO TERMINALS MENU POWER Press → On. Press again → Off. VOLUME UP/DOWN CHANNEL UP/DOWN SENSOR AREA FOR ) Selects next higher channel. (+) Increases sound. REMOTE CONTROL ( ) Selects next lower channel.

  • Page 5: Installation And Service Instructions

    27R-S50 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 27R-S50 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 27R-S50 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 27R-S50 SIGNAL DATA SERVICE ADJUST ITEM ADJUSTMENT CONTENTS POSITION RANGE INITIAL VALUE 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

    27R-S50 Ë SERVICE ADJUSTMENT 4. Select the service adjustment "S03" and set the data Note: Before making the service adjustment, make the bus data settings. value to "01" to turn off the luminance signal (Y-mute). +B Adjustment 5. Select the service adjustment "S14" and adjust the data value to obtain 2.35 volts as shown in Figure B.
  • Page 10 27R-S50 Ë MTS ADJUSTMENT Vertical-Size, V-Linearity and 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.

  • Page 11: Chassis Layout

    27R-S50 CHASSIS LAYOUT...

  • Page 12: Block Diagram

    27R-S50 BLOCK DIAGRAM...

  • Page 13: Schematic Diagrams

    27R-S50 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 14 27R-S50 SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 15 27R-S50 SCHEMATIC DIAGRAM: MAIN-2 Unit...
  • Page 16 27R-S50 SCHEMATIC DIAGRAM: CRT and FRONT A/V Unit...
  • Page 17 27R-S50 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
  • Page 18 27R-S50 PWB-A: MAIN Unit (Chip Parts Side)
  • Page 19 27R-S50 PWB-B: CRT Unit (Wiring Side) PWB-H: FRONT A/V Unit (Wiring Side)

  • Page 20: 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 å Free; 1-800-BE-SHARP IC771 VHiKA7805AP-1 J KIA7805API å...
  • Page 21 27R-S50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV2 D717 RH-EX0616GEZZ J Zener Diode, 5.6V ' å D725 RH-DX0131CEZZ J Diode å MAIN UNIT (Continued) D726 VHD1SS119//-1 J Diode Q752 VS2SC3198-Y-1 J 2SC3198-Y RH-DX0475CEZZ...
  • Page 22 27R-S50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV2 RC-KZ009SCEZZ MAIN UNIT (Continued) RC-KZ0106GEZZ C302 VCKYCY1HB102K J 1000p 50V Ceramic RC-KZ0311CEZZ C304 VCCCCY1HH220J J 22p Ceramic C710 VCKYPH3DB561K J 560p 2kV Ceramic C305 VCKYCY1HB103K J 0.01...
  • Page 23 27R-S50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV2 R451 VRS-RG2HC103J J 10k 1/2W M-Ox. R453 VRD-RA2BE152J J 1.5k 1/8W Carbon MAIN UNIT (Continued) R454 VRD-RM2HD184J J 180k 1/2W Carbon R455 VRD-RA2BE392J J 3.9k 1/8W Carbon C3011 VCEA0A1HW475M J 4.7...
  • Page 24 27R-S50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV2 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 25: Crt Unit

    27R-S50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A: DUNTKA450WEV2 PWB-B: DUNTK9510WEW3 MAIN UNIT (Continued) CRT UNIT TRANSISTORS P751 QPLGN0461CEZZ J Plug, 4-pin (YBN) P1401 QPLGN0561CEZZ J Plug, 5-pin (HA) Q851 VS2SC3198-Y-1 J 2SC3198(Y) P2001 QPLGN0561CEZZ J Plug, 5-pin (TP2001-5)

  • Page 26: Supplied Accessories

    27R-S50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-H: DUNTK9310WEW7 SUPPLIED ACCESSORIES FRONT A/V UNIT MISCELLANEOUS PARTS RRMCG1324CESA J Infrared R/C Unit J1001 QJAKE0053GEZZ J Jack, Video-In TGAN-0001GJZZ X Guarantee Card J1002 QJAKE0055GEZZ J Jack, Audio-In (L)

  • Page 27: Cabinet Parts

    Code CABINET PARTS CABINET PARTS LOCATION CCABA0135WEH0 X Front Cabinet Ass'y Not Available – Front Cabinet — GCOVA1033MEKA X Cover for R/C HBDGB1009MESB X "SHARP" Badge JBTN-1096MEKA X Button, Power, Vol-up/down AG JBTN-1097MEKA X Button, CH-up/down GCABB0126GJKA X Rear Cabinet...

  • Page 28: Packing Of The Set

    27R-S50 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 29 27R-S50 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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