Sharp 27C540 Service Manual
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Sharp 27C540 Service Manual

Sharp 27C540 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
» SERVICE ADJUSTMENT ..................................................................................................................... 9
» CHASSIS LAYOUT ............................................................................................................................. 12
» BLOCK DIAGRAM .............................................................................................................................. 13
» DESCRIPTION OF SCHEMATIC DIAGRAM & WAVEFORMS .......................................................... 14
» SCHEMATIC DIAGRAMS ................................................................................................................... 15
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 22
» PARTS LIST ........................................................................................................................................ 27
» PACKING OF THE SET ...................................................................................................................... 35
POWER INPUT ..................................................... 120V AC, 60 Hz
POWER RATING ................................................................... 115W
PICTURE SIZE .......................................... 2,187 cm
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 .............. 3.0W + 3.0W (at 10% distortion and
SHARP CORPORATION
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
(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.
COLOR TELEVISION
Chassis No. GB-3U(1W)
27C540
27C540
S34P927C540//
Page
(EIA, Channel Plan U.S.A.)

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  • Page 1: Table Of Contents

    27C540 SERVICE MANUAL S34P927C540// COLOR TELEVISION Chassis No. GB-3U(1W) 27C540 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

    27C540 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 27C540 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: Location Of User's Control

    27C540 LOCATION OF USER'S CONTROL Front Panel POWER VIDEO/AUDIO IN 2 TERMINALS Press → On. POWER MENU — VOL + Press again → Off. PULL-OPEN POWER MENU — VOL + CHANNEL UP/DOWN REMOTE CONTR ( ) Selects next higher channel. SENSOR "...

  • Page 5: Installation And Service Instructions

    27C540 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. CIRCUIT PROTECTION HIGH VOLTAGE CHECK High voltage is not adjustable but must be checked The receiver is protected by a 4.0A fuse (F701),...
  • Page 6 27C540 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 7 TINT-S 0-127 (00h-7Fh) 62 (3Eh) Component Input C-TRAP 0-1 (00h-01h) 0 (00h) AUTO FRESH 0-1 (00h-01h) 0 (00h) SHARP P F 0-1 (00h-01h) 1 (01h) CD MATRIX 0-3 (00h-03h) 2 (02h) B-Y ATT 0-1 (00h-01h) 0 (00h) R-Y ATT 0-1 (00h-01h)
  • Page 8 27C540 DATA SERVICE NOTES FIXED VALUE ADJUSTMENT ITEM NUMBER (HEX) RANGE INITIAL VALUE EW CORNER BOTTOM 19-81 (13h-51h) 50 (32h) Offset toward D13. NOISE DET LEVEL 0-3 (00h-03h) 0 (00h) V CENTERING 0-63 (00-3Fh) 36 (24h) V-AGC 0-1 (00h-01h) 0 (00h)

  • Page 9: Service Adjustment

    27C540 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 IC2001 Data is stored in IC2101.
  • Page 10 27C540 Sub-Tint Adjustment Note: Aging for 10 min before adjustment. After the adjustment of V-center and V-size, re- 1. Receive the half color bar signal. • RF INPUT (TU51) adjustment for this V-line. 2. Get into Y-Mute by R/C, or by setting the "V11" bus data to "01".
  • Page 11 27C540 Ë MTS ADJUSTMENT MTS Level Adjustment 1. Set the sound volume above 1. Monoral signal: 400Hz, 100% modulation 2. Confirm "EX4" data is "5Ah". 3. Vary the "M01" bus data until the voltage to pin (39) of IC3001 to become the value as stated below.

  • Page 12: Chassis Layout

    27C540 CHASSIS LAYOUT...

  • Page 13: Block Diagram

    27C540 BLOCK DIAGRAM...

  • Page 14: Description Of Schematic Diagram & Waveforms

    27C540 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=kW=1000W, M=MW) wave shapes at the red, green and blue cathodes of 2.

  • Page 15: Schematic Diagrams

    27C540 SCHEMATIC DIAGRAM: CRT Unit...
  • Page 16 27C540 SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 17 27C540...
  • Page 18 27C540 SCHEMATIC DIAGRAM: MAIN-2 Unit...
  • Page 19 27C540...
  • Page 20 27C540 SCHEMATIC DIAGRAM: 3-LINE Y/C Unit...
  • Page 21 27C540...

  • Page 22: Printed Wiring Board Assemblies

    27C540 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (A Side)
  • Page 23 27C540...
  • Page 24 27C540 PWB-A: MAIN Unit (B side)
  • Page 25 27C540...
  • Page 26 27C540 PWB-B: CRT Unit (Wiring side) PWB-C: 3-LINE Y/C Unit (Wiring side) PWB-C: 3-LINE Y/C Unit (Chip Parts side)

  • Page 27: Parts List

    ç å IC703 VHiSE125N++-F X SE125N IC751 VHiPQ09RDA1-1 X PQ090RDA1SZ in USA: Contact your nearest SHARP Parts Distributor to order. For IC900 VHiCXA2089Q-2Y X CXA2089Q-6T location of SHARP Parts Distributor, Please call Toll-Free; 1- IC1403 VHiPQ05RDA1-1 X PQ050RDA1SZ 800-BE-SHARP IC2001 RH-iXA418WJZZQ X TMP88CS38BFG...
  • Page 28 27C540 Ref. No. Part No. Description Code Ref. No. Part No. Description Code D454 RH-EX0628GEZZY X Zener Diode, 8.2V CAPACITORS D455 VHD1SS133++-1Y X 1SS133 VCEA0A1HW105M+X 1 50V Electrolytic D502 VHD1SS133++-1Y X 1SS133 VCEA0A1HW475M+X 4.7 50V Electrolytic D510 RH-DX0441CEZZY X VCEA0A0JW108M+ X 1000 6.3V Electrolytic å...
  • Page 29 27C540 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C523 VCEA0A1HW105M+X 1 50V Electrolytic C904 VCEA0A1HW105M+X 1 50V Electrolytic C601 VCEA0A1CW477M+X 470 16V Electrolytic C905 VCEA0A1HW105M+X 1 50V Electrolytic C602 VCKYCY1CF104ZY X 0.1 16V Ceramic C906...
  • Page 30 27C540 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R367 VRN-RL3DB3R3J+ X 3.3 2W Metal Film C3028 VCKYCY1HB682KY X 6800p 50V Ceramic å R368 VRD-RA2BE222JY X 2.2k 1/8W Carbon C3029 VCKYCY1HB682KY X 6800p 50V Ceramic R369 VRD-RA2BE822JY X 8.2k 1/8W...
  • Page 31 27C540 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R612 VRS-CY1JF154JY X 150k1/16W Metal Oxide R915 VRS-CY1JF102JY X 1k 1/16W Metal Oxide R613 VRS-CY1JF101JY X 100 1/16W Metal Oxide R916 VRS-CY1JF683JY X 68k 1/16W Metal Oxide R614 VRS-CY1JF562JY X 5.6k 1/16W Metal Oxide...
  • Page 32 27C540 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R2045 VRS-CY1JF473JY X 47k 1/16W Metal Oxide å F701 QFS-B4023CEZZ X Fuse, 4A/125V R2046 VRS-CY1JF101JY X 100 1/16W Metal Oxide FH701 QFSHD1013CEZZ+ X Fuse Holder R2047 VRS-CY1JF221JY X 220 1/16W Metal Oxide FH702 QFSHD1014CEZZ+ X Fuse Holder R2048 VRS-CY1JF562JY X 5.6k 1/16W Metal Oxide...
  • Page 33 27C540 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1519 VCEA0A2CW106M+X 10 160V Electrolytic L1402 VP-XF100K0000Y X Peaking 10µH L1406 VP-XF220K0000Y X Peaking 22µH RESISTORS L1407 VP-XF220K0000Y X Peaking 22µH L1408 VP-XF100K0000Y X Peaking 10µH R850 VRS-SV2HC152J X 1.5k...
  • Page 34 CCABAA060WEH8 X Front Cabinet Ass’y MISCELLANEOUS PARTS Not Available – Front Cabinet — P1401 QPLGZ0810CEZZ X Plug, 8Pin GCOVA0121GJSA X RC/LED Cover HBDGB1009MESB X SHARP Badge JBTN-0138GJKF X Button, Power JBTN-0139GJSF X Button, Menu, CH-Up/Down, VOL-Up/Down GCOVA0116GJKA X Door Cover GDORFA004WJKC X Door...

  • Page 35: Packing Of The Set

    27C540 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 Use 12 staples to fix the bottom side of packing case.
  • Page 36 27C540 COPYRIGHT © 2004 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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