Service manual

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27U-S650

SERVICE MANUAL

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.

MODELS

27U-S650

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

Page

» 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

» SCHEMATIC DIAGRAMS ...................................................................................................................14

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................23

» REPLACEMENT PARTS LIST ............................................................................................................28

» PACKING OF THE SET ......................................................................................................................39

CONTENTS

SPEAKER

SIZE .......................................................... 9 x 5 cm oval (2 pcs.)

VOICE COIL IMPEDANCE............................... 8 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

(EIA, Channel Plan U.S.A.)

POWER INPUT ..................................................... 120V AC 60 Hz

POWER RATING .................................................................. 126W

PICTURE SIZE ........................................... 2,187cm

(339sq inch)

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

(Nominal)

AUDIO POWER

OUTPUT RATING .............. 3.0W + 3.0W (at 10% distortion and

Dual CH Operate)

Specifications are subject to change without

prior notice.

ELECTRICAL SPECIFICATIONS

COLOR TELEVISION

Chassis No. GB-1

Summary of content (37 pages)

PAGE 1
27U-S650 SERVICE MANUAL COLOR TELEVISION Chassis No. GB-1 27U-S650 MODELS 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. CONTENTS Page » ELECTRICAL SPECIFICATIONS ......................................................................................................... 1 » IMPORTANT SERVICE SAFETY PRECAUTION .................................................
PAGE 2
7U-S650 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 should be attempted. 2. Disconnect AC power before servicing. 3. Semiconductor heat sinks are potential shock hazards when the chassis is operating. 4.
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27U-S650 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) • Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC line cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these check.) Any current measured must not exceed 0.
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27U-S650 LOCATION OF USER'S CONTROL Front Panel VIDEO IN 2 L-AUDIO-R (INSIDE DOOR) CHANNEL UP/DOWN ( ) Selects next higher channel. ( ) Selects next lower channel. • Press both at the same time to access the MAIN MENU screen. | POWER Press → On. Press again→ Off. | SENSOR AREA FOR REMOTE CONTROL MENU Press → Accesses MAIN MENU. Press again → Exits MAIN MENU. VOLUME UP/DOWN (+) Increases sound. (–) Decreases sound.
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27U-S650 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 The receiver is protected by a 4.0A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.
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27U-S650 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 service adjustments are required. 1. Service mode To enter the service mode and exit service mode.
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27U-S650 SERVICE NUMBER V01 V02 V03 V04 V05 V06 V07 V08 V09 V10 V11 V12 V13 V14 V15 V16 V17 V18 V19 V24 V25 V26 V27 V28 V29 V30 V31 V32 V33 V34 V35 V36 V37 V38 V39 V40 V41 V42 V43 V44 V45 V46 V47 V48 V49 V50 V51 V52 V53 R01 R02 R03 D01 D02 D03 D04 D05 D06 DATA ADJUSTMENT ITEM PICTURE TINT COLOR SUB-COLOR BRIGHT R CUT-OFF G CUT-OFF B CUT-OFF G DRIVE B DRIVE SHARP N PHASE DC RESTORATION BLACK STRETCH ABL START POINT ABL GAIN γ POINT Y-MUTE/V-STOP ENERGY SAVE LOW-G LOW-B ML-G ML-B HIGH-G HIGH-B WPS RGB CONT
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27U-S650 SERVICE NUMBER D07 D08 D09 D10 D11 D12 EX1 EX2 EX3 EX4 EX5 EX6 OP1 OP2 OP3 M01 M02 M03 M04 M05 DATA ADJUSTMENT ITEM EW PARABOLA EW TRAPEZIUM EW CORNER AFC GAIN V EHT H EHT FAO VOLUME CC-POSITION INT A-ATT TUNER data SYNC SLICE LEVEL OPTION1 OPTION2 OPTION3 INPUT LEVEL MTS VCO FILTER WIDEBAND SPECTRAL ADJUSTMENT CONTENTS INITIAL VALUE RANGE 21 0E 0C 02 07 03 24 21 7A 5A 00 36 F7 F9 0F 09 24 1F 18 10 0-63(00h-3Fh) 0-31(00h-1Fh) 0-15(00h-0Fh) 0-3(00h-03h) 0-7(00h-07h) 0-7(00h-07h) 0-50(00h-32h)
PAGE 9
27U-S650 SERVICE ADJUSTMENT RF AGC Adjustment Sub-picture and Sub-Bright Adjustments 1. Receive a good local channel. 2. Enter the service mode and select the service adjustment "R01". 3. Set the data value to point where no noise or beat appears. 4. Select another channel to confirm that no noise or beat appears. Note 1 : You will have to come out of the service mode to select another channel. Note 2 : Setting the data to "00" will produce a black raster. 1. Receive the window pattern signal.
PAGE 10
27U-S650 Sub-Tint Adjustment Vertical Phase Adjustment 1. Receive the half color bar signal. • RF INPUT 2. Get into Y-Mute by R/C, or by setting the "V18" bus data to "01". 3. Vary the "V02" bus data until the waveform becomes as stated below. 1. Enter the service mode and select the service adjustment "D01". 2. Adjust "D01" data value so that picture is centered. Horizontal Position Adjustment 1. Receive a good local channel. 2. Enter the service mode and select the service adjustment "D02". 3.
PAGE 11
27U-S650 Ë MTS ADJUSTMENT Separation Adjustment 1. Connect the rms voltmeter to pin (39) of IC3001. 2. Receive the following composite stereo signal 1. Composite stereo signal: 30% modulation, left channel only, noise reduction on, 300Hz 3. Enter the service mode and select the service adjustment "M04". 4. Adjust the data until the AC voltage reading of the RMS voltmeter is minimum. 5. Receive the following composite stereo signal 2.
PAGE 12
27U-S650 CHASSIS LAYOUT H G F E D C B A 1 2 3 4 12 5 6
PAGE 13
27U-S650 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 13 5 6
PAGE 14
27U-S650 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: 1. Photographs taken on a standard gated color bar signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of the picture tube depend on the tint, color level and picture control. 2. indicates waveform check points (See chart, waveforms are measured from point indicated to chassis ground.) NOTES: 1. The unit of resistance "ohm" is omitted. (K=kΩ=1000Ω, M=MΩ) 2.
PAGE 15
27U-S650 SCHEMATIC DIAGRAM: MAIN-1 Unit H G F E D C B A 1 3 2 15 4 5 6 7 8 9 10 11 16 12
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27U-S650 SCHEMATIC DIAGRAM: MAIN-2 Unit H G F E D C B 16 A 1 3 2 17 4 5 6 7 8 9 10 11 18 12
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27U-S650 SCHEMATIC DIAGRAM: AV Unit H DUNTKA602WEA0 G F E D C B A 1 3 2 19 4 5 6 7 8 9 10 11 20 12
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27U-S650 SCHEMATIC DIAGRAM: CRT Unit H G F E D C B A 1 2 3 4 21 5 6
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27U-S650 DIAGRAM: MTS MODULE Unit H G F E D C B A 1 2 3 4 22 5 6
PAGE 20
27U-S650 PRINTED WIRING BOARD ASSEMBLIES H G F E D C B A PWB-A: MAIN Unit (Wiring Side) 1 2 3 4 23 5 6
PAGE 21
27U-S650 H G F E D C B A PWB-A: MAIN Unit (Chip Parts Side) 1 2 3 4 24 5 6
PAGE 22
27U-S650 H G F PWB-C: AV Unit (Wiring Side) E D C B PWB-C: AV Unit (Chip parts Side) A 1 2 3 4 25 5 6
PAGE 23
27U-S650 H G F PWB-S: MTS MODULE Unit (Wiring Side) E D C B PWB-S: MTS MODULE Unit (Chip Parts Side) A 1 2 3 4 26 5 6
PAGE 24
27U-S650 H G F E D C PWB-B: CRT Unit (Wiring Side) B A 1 2 3 4 27 5 6
PAGE 25
27U-S650 Ref. No. Part No. ★ Description Code Ref. No. PARTS LIST PWB-A DUNTKA526WEE8 PWB-B DUNTKA527WEB9 PWB-C DUNTKA602WEA0 PWB-S DUNTKB224WEA2 "HOW TO ORDER REPLACEMENT PARTS" 2. REF. NO. 4.
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27U-S650 Ref. No. ★ Part No. Description Code Ref. No.
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U-S650 Ref. No. Part No. ★ Description Code Ref. No.
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27U-S650 Ref. No. ★ Part No. Description Code Ref. No.
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27U-S650 Ref. No. Part No. ★ Description Code Ref. No.
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27U-S650 Ref. No. Part No. ★ Description Code Ref. No.
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27U-S650 Ref. No. Part No. ★ Description Code Ref. No. PWB-A: DUNTKA526WEE8 MAIN UNIT ★ Part No.
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27U-S650 Ref. No. Part No. ★ Description Code Ref. No.
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27U-S650 Ref. No. Part No. ★ Description Code Ref. No.
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27U-S650 Ref. No. ★ Part No. Description Code Ref. No. PWB-S: DUNTKB224WEA2 å INTEGRATED CIRCUITS J CXA2074Q AY CAPACITORS C3001 C3002 C3003 C3004 C3005 C3006 C3007 C3008 C3009 C3010 C3011 C3012 C3013 C3014 C3015 C3016 C3017 C3018 C3029 C3030 C3031 C3032 [EL.··· Electrolytic] VCE9GA1HW475M J 4.7 50V VCKYCY1HB562K J 5600p 50V VCQYTA1HM123J J 0.012 50V VCEA0A1HW105M J 1 50V VCE9GA1HW475M J 4.7 50V VCEA0A1HW106M J 10 50V VCEA0A1HW475M J 4.7 50V VCKYCY1HF103Z J 0.
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27U-S650 Ref. No. Part No. ★ Description Code Ref. No. PACKING PARTS – – – – – Packing Case Wrapping Paper Buffer Material Polyethylene Bag Carton Label Description Code CABINET PARTS (NOT REPLACEMENT ITEM) SPAKCA100WJZZ SPAKP0109GJZZ SPAKX0134GJZZ SSAKA0101GJZZ TLABZA058WJZZ ★ Part No.
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27U-S650 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. ★ MARK : Not replacement items.
PAGE 37
27U-S650 COPYRIGHT © 2002 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. TQ0000-S June. 2002 Printed in Japan D SEM P SEMEX MI. KG SHARP ELECTRONICA MEXICO S. A. DE C. V. Blvd. SHARP No. 3510 Parque Industrial Rosarito, Playas de Rosarito, B. C.