Sharp 27SC370 Service Manual
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Sharp 27SC370 Service Manual

Sharp 27SC370 Service Manual

Chassis no. gb-d7
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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 ..................................................................................................... 5
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 6
» SERVICE ADJUSTMENT ................................................................................................................... 13
» CHASSIS LAYOUT ............................................................................................................................. 16
» BLOCK DIAGRAM .............................................................................................................................. 17
» DESCRIPTION OF SCHEMATIC DIAGRAMS & WAVEFORMS ........................................................ 18
» SCHEMATIC DIAGRAMS ................................................................................................................... 19
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 26
» PARTS LIST ........................................................................................................................................ 31
» PACKING OF THE SET ...................................................................................................................... 40
POWER INPUT ..................................................... 120V AC, 60 Hz
POWER RATING .................................................................. 110W
PICTURE SIZE ....................................... 2,193.5 cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ...... 45.75 MHz (Analog Terrestrial)
Sound IF Carrier Frequency ....... 41.25 MHz (Analog Terrestrial)
Color Sub-Carrier Frequency ..... 42.17 MHz (Analog Terrestrial)
IF Center Frequency ........................ 44 MHz (Digital Terrestrial)
AUDIO POWER
OUTPUT RATING .............. 3.0W + 3.0W (at 10% distortion and
SERVICE MANUAL
MODEL
CONTENTS

ELECTRICAL SPECIFICATIONS

SPEAKER
SIZE .......................................................... 9 x 5 cm oval (2 pcs.)
2
(339sq inch)
VOICE COIL IMPEDANCE ............................. 16 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 (Analog)
CATV Channels ............................................. 1 thru 135 (Digital)
Digital Terrestrial Broadcast (VHF/UHF) ....................... 2 thru 69
(Nominal)
Specifications are subject to change without
Dual CH Operate)
prior notice.
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
No. S47E527SC370/
COLOR TELEVISION
Chassis No. GB-D7
27SC370
(EIA, Channel Plan U.S.A.)
27SC370
Page

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Summary of Contents for Sharp 27SC370

  • Page 1: Table Of Contents

    27SC370 SERVICE MANUAL No. S47E527SC370/ COLOR TELEVISION Chassis No. GB-D7 27SC370 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

    27SC370 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 27SC370 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 Before returning the receiver to the user, perform across the resistor.
  • Page 4 27SC370 Precautions for using lead-free solder 1 Employing lead-free solder "PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.

  • Page 5: Location Of User's Control

    27SC370 LOCATION OF USER'S CONTROL Front Panel POWER Press → On. Press again → Off. VIDEO/AUDIO IN 2 TERMINALS REMOTE CONTROL SENSOR MENU Press → Accesses MAIN MENU. VOLUME UP/DOWN CHANNEL UP/DOWN Press again → Exits MAIN MENU. (k) Increases sound.

  • Page 6: Installation And Service Instructions

    27SC370 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 7 27SC370 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 8 27SC370 A. Deflection Item. DATA Range Remark Revision / Change V-SHIFT V-SHIFT 0 … 7 [13h D2…D0] H-PHASE H-SHIFT 0 … 31 H-PHASE.DTV [16h D4…D0] V-POS-4:3 m-con 0 … 255 V-PHASE.DTV V-SIZE V-SIZE-4:3 0 … 63 V-SIZE.DTV [11h D5…D0] H-SIZE H-SIZE-4:3 0 …...
  • Page 9 27SC370 Item. DATA Range Remark Revision / Change Auto-Slice AS-SAV 0 / 1 [16h D6] Auto-Slice AS-YUV 0 / 1 [16h D6] Auto-Slice AS-DTV 0 / 1 [16h D6] FBP VTH L FBP-TV 0 / 1 [16h D5] AS SPEED UP...
  • Page 10 27SC370 Item. DATA Range Remark Revision / Change V-TONE SHPG-YUV 0 / 1 [02h D3] Y-Delay YDL-YUV 0 … 7 [06h D2…D0] CrDL FINE ADJ. CrDL-FINE-YUV 0 … 3 [21h D3…D2] CbDL FINE ADJ. CbDL-FINE-YUV 0 … 3 [21h D1…D0] CB PEDESTAL ADJ.
  • Page 11 27SC370 Item. DATA Range Remark Revision / Change BRIGHT(OFFSET) -63 … +63 BRIGHT-OFF-AV [0Ah D7…D0] CONTRAST(OFFSET) CON-OFF-AV -32 … +32 [05h D6…D0] TINT(OFFSET) TINT-OFF-AV -32 … +32 [07h D6…D0] COLOR(OFFSET) -32 … +32 COL-OFF-AV [08h D6…D0] VIDEO-TONE(OFFSET) SHP-OFF-AV -32 … +32 [04h D6…D0]...
  • Page 12 27SC370 Item. DATA Range Remark Revision / Change R MTX DOWN V105 R-MTX-DN 0 / 1 [23h D6] V106 0 / 1 [23h D3] KILLER LEVEL V107 KILLER-LVL 0 / 1 [15h D0] SIF BPF WIDE V108 SIF-BW 0 … 3 [2Bh D5…D4]...

  • Page 13: Service Adjustment

    27SC370 Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2101. ADJUSTMENT PART REPLACED NOTES NECESSARY UNNECESSARY The adjustment is needed to compensate for characteristics of parts IC801 including IC801 and MTS level (M01).
  • Page 14 27SC370 White Balance Adjustment Sub-Tint Adjustment 1. Receive a good local channel. 1. Receive the half color bar signal. • RF INPUT (TU1101) 2. Enter the service mode and select the service adjustment "V03" and set to "00" (minimum color) 2.
  • Page 15 27SC370 Vertical-Size and Linearity Adjustments EW-Corner 1. Receive a good local channel. 1. Receive a good local channel. (SCREEN FORMAT 4:3) (SCREEN FORMAT 4:3) 2. Enter the service mode and select the service 2. Enter the service mode and select the service adjustment "D04"...

  • Page 16: Chassis Layout

    27SC370 CHASSIS LAYOUT...

  • Page 17: Block Diagram

    27SC370 BLOCK DIAGRAM...

  • Page 18: Description Of Schematic Diagrams & Waveforms

    27SC370 DESCRIPTION OF SCHEMATIC DIAGRAMS 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=kW=1000W, M=MW) wave shapes at the red, green and blue cathodes of 2.

  • Page 19: Schematic Diagram: Crt Unit

    27SC370 SCHEMATIC DIAGRAM: CRT Unit...
  • Page 20 27SC370 SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 21 27SC370...
  • Page 22 27SC370 SCHEMATIC DIAGRAM: MAIN-2 Unit...
  • Page 23 27SC370...
  • Page 24 27SC370 SCHEMATIC DIAGRAM: 2-LINE Y/C Unit...
  • Page 25 27SC370...

  • Page 26: Printed Wiring Board Assemblies

    27SC370 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Components Side)
  • Page 27 27SC370...
  • Page 28 27SC370 PWB-A: MAIN Unit (Components side)
  • Page 29 27SC370...
  • Page 30 27SC370 PWB-B: CRT Unit (Wiring Side) PWB-D: 2-LINE Y/C Unit (Wiring Side) PWB-D: 2-LINE Y/C Unit (Chip Parts Side)

  • Page 31: Parts List

    X STR-W6535A LF NO.2003 AM å IC702 RH-FXA003WJZZ J PC123Y82 in USA: Contact your nearest SHARP Parts Distributor to order. For IC751 VHIPQ090DNA-1Y J PQ090DNA1ZPH location of SHARP Parts Distributor, Please call Toll-Free; 1- IC752 VHIBA50B0WP-1Y J BA50BC0WFP-E2 800-BE-SHARP IC801 RH-IXB945WJQZQ X...
  • Page 32 27SC370 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DIODES TRANSFORMERS D301 RH-EX0611GEZZY J Zener Diode MTZJT-725.1A AA T601 RTRNZ0057PEZZ J Transformer å D302 VHDHSS4148+-1Y J HSS4148TA-E T602 RTRNFA106WJZZ X H-Volt Transformer çå D303 VHDHSS4148+-1Y J HSS4148TA-E å...
  • Page 33 27SC370 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C705 RC-EZ0719CEZZ X 560 200V Electrolytic å C907 VCEA0A1AW477M+ J 470 10V Electrolytic C708 RC-FZA146WJZZ X 0.33 275V å C908 VCEA0A1HW475M+J 4.7 50V Electrolytic C710 VCFYFA1HA103J+ J 0.01 50V...
  • Page 34 27SC370 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R305 VRS-CY1JF472JY J 4.7k 1/16W Metal Oxide C3015 VCEACA1HC335K+ X 3.3 50V Electrolytic R306 VRN-RL3LB2R7J+ X 2.7 3.0W Metal Film C3016 VCE9GA1HW475M+J 4.7 50V Electrolytic (N.P) R307 VRD-RM2HD2R2JY J 2.2 1/2W Carbon...
  • Page 35 27SC370 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R686 VRD-RA2EE332JY J 3.3k 1/4W Carbon R838 VRS-CY1JF472JY J 4.7k 1/16W Metal Oxide R687 VRD-RA2BE103JY J 10k 1/8W Carbon R839 VRS-CY1JF102JY J 1k 1/16W Metal Oxide R688 VRN-RL3DB3R3J+ J 3.3 2W Metal Film...
  • Page 36 27SC370 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R1116 VRD-RA2BE101JY J 100 1/8W Carbon R8851 VRS-CY1JF101JY J 100 1/16W Metal Oxide R1118 VRD-RA2BE470JY J 47 1/8W Carbon R8852 VRS-CY1JF101JY J 100 1/16W Metal Oxide R1119 VRD-RA2BE101JY J 100 1/8W Carbon...
  • Page 37 27SC370 Ref. No. Part No. Description Code Ref. No. Part No. Description Code P2401 QPLGN0661CEZZA X Plug 6pin R856 VRD-RA2BE121JY J 120 1/8W Carbon RDA303 PRDARA422WJFW X Heat Sink R857 VRD-RA2BE121JY J 120 1/8W Carbon å RDA501 PRDARA421WJFW X Heat Sink...
  • Page 38 27SC370 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1409 VCEA0A1CW476M+J 47 16V Electrolytic C1410 VCKYCY1HB103KY J 0.01 50V Ceramic C1411 VCKYCY1HB103KY J 0.01 50V Ceramic C1412 VCKYCY1HB103KY J 0.01 50V Ceramic C1413 VCKYCY1HB103KY J 0.01 50V Ceramic C1414 VCE9GA1HW105M+J 1 50V Electrolytic (N.P)

  • Page 39: Packing Parts

    CCABAB574WEH2 X Front Cabinet Assembly TINS-C817WJZZ X Operation Manual Not Available – Front Cabinet — TGAN-A216WJN1 X Guarantee Card HBDGB1009MESB X SHARP Badge GCOVA0121GJSA X LED R/C Cover Not Available – Power Button — Not Available – Button — GCABBA721WJKA X Rear Cabinet...

  • Page 40: Packing Of The Set

    27SC370 PACKING OF THE SET FRONT Use tape to fix the top side of packing case. REAR Use 12 staples to fix the bottom side of packing case.
  • Page 41 27SC370 - M E M O -...
  • Page 42 27SC370 COPYRIGHT © 2007 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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