Service manual

ManualsBrandsSharp ManualsCRT TV27F631

27F630

27F631

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

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.

COLOR TELEVISION

Chassis No. GB-3U

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

» DESCRIPTION OF SCHEMATIC DIAGRAMS & WAVEFORMS ........................................................14

» SCHEMATIC DIAGRAMS ...................................................................................................................15

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

» REPLACEMENT PARTS LIST ............................................................................................................27

» PACKING OF THE SET ......................................................................................................................35

CONTENTS

SPEAKER

SIZE ........................................................ 12 x 6 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 .................................................................. 135W

PICTURE SIZE ....................................... 2,193.5 cm

(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 .............. 5.0W + 5.0W (at 10% distortion and

Dual CH Operate)

Specifications are subject to change without

prior notice.

ELECTRICAL SPECIFICATIONS

MODELS

SERVICE MANUAL

27F630

27F631

S13W527F630//

Summary of content (36 pages)

PAGE 1
27F630 27F631 SERVICE MANUAL S13W527F630// COLOR TELEVISION Chassis No. GB-3U MODELS 27F630 27F631 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
7F630 27F631 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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27F630 27F631 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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27F630 27F631 LOCATION OF USER'S CONTROL Front Panel INSIDE DOOR POWER Press → On. Press again → Off. VIDEO/AUDIO IN 2 TERMINALS REMOTE CONTROL SENSOR MENU Press → Accesses MAIN MENU. Press again → Exits MAIN MENU. CHANNEL UP/DOWN (') Selects next higher channel. (") Selects next lower channel. VOLUME UP/DOWN ( + ) Increases sound. ( —) Decreases sound. Basic Remote Control Functions POWER Press → On. Press again → Off.
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27F630 27F631 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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27F630 27F631 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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27F630 27F631 A.
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27F630 27F631 SERVICE NUMBER D14 D15 D18 D19 DATA ADJUSTMENT ITEM RANGE EW CORNER BOTTOM NOISE DET LEVEL V CENTERING V-AGC NOTES INITIAL VALUE 19-81 (13h-51h) 0-3 (00h-03h) 0-63 (00-3Fh) 0-1 (00h-01h) 50 (32h) 0 (00h) 36 (24h) 0 (00h) Offset toward D13. FIXED VALUE (HEX) 32 00 00 B.
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27F630 27F631 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. PART REPLACED IC2001 ADJUSTMENT NECESSARY UNNECESSARY X NOTES Data is stored in IC2101. The adjustment is needed to compensate for characteristics of parts including IC201 and MTS level (M01).
PAGE 10
27F630 27F631 Note: Aging for 10 min before adjustment. After the adjustment of V-center and V-size, readjustment for this V-line. Sub-Tint Adjustment 1. Receive the half color bar signal. • RF INPUT (TU51) 2. Get into Y-Mute by R/C, or by setting the "V11" bus data to "01". 3. Vary the "V02" bus data until the waveform becomes as stated below. Vertical Phase Adjustment (SCREEN FORMAT 4:3) 1. Enter the service mode and input data of “00h” on "D01". 2. Adjust "D18" data value so that picture is centered.
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27F630 27F631 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. SETTING VOLTAGE ADJ spec : 490±10mVrms CHK spec: 490±20mVrms MTS VCO Adjustment 1. Keep the unit in no-signal state. 2. Connect the frequency counter to pin (39) of IC3001. 3.
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27F630 27F631 CHASSIS LAYOUT H G F E D C B A 1 2 3 4 12 5 6
PAGE 13
27F630 27F631 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 13 5 6
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27F630 27F631 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 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.) 1. The unit of resistance "ohm" is omitted. (K=kΩ=1000Ω, M=MΩ) 2.
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27F630 27F631 SCHEMATIC DIAGRAM: CRT Unit H G F E D C B A 1 2 3 4 15 5 6
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27F630 27F631 SCHEMATIC DIAGRAM: MAIN-1 Unit H G F E D C B A 1 2 3 4 5 6 16 7 8 9 10
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27F630 27F631 10 11 12 13 14 15 17 16 17 18 19
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27F630 27F631 SCHEMATIC DIAGRAM: MAIN-2 Unit H G F E D C B A 1 2 3 4 5 6 18 7 8 9 10
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27F630 27F631 10 11 12 13 14 15 19 16 17 18 19
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27F630 27F631 SCHEMATIC DIAGRAM: 3-LINE Y/C Unit H G F E D C B A 1 2 3 4 5 6 20 7 8 9 10
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27F630 27F631 10 11 12 13 14 15 21 16 17 18 19
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27F630 27F631 SCHEMATIC DIAGRAM: AUDIO Unit H G F E D C B A 1 2 3 4 22 5 6
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27F630 27F631 PRINTED WIRING BOARD ASSEMBLIES H G F E D PWB-B: CRT Unit (Wiring Side) C B A PWB-C: 3-LINE Y/C Unit (Wiring Side) 1 2 PWB-C: 3-LINE Y/C Unit (Chip Parts Side) 3 4 23 5 6
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27F630 27F631 H G F E D C B A PWB-A: MAIN Unit (Components Side) 1 2 3 4 24 5 6
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27F630 27F631 H G F E D C B A PWB-A: MAIN Unit (Chip Parts Side) 1 2 3 4 25 5 6
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27F630 27F631 H G F PWB-S: AUDIO Unit (Wiring Side) E D C PWB-S: AUDIO Unit (Chip Parts Side) B A 1 2 3 4 26 5 6
PAGE 27
F630 27F631 Ref. No. Part No. ★ Description Code Ref. No. PARTS LIST TUNER NOTE: THE PARTS HERES SHOWN ARE SUPPLIED AS AN ASSEMBLY BUT NOT INDEPENDENTLY. å TU51 VTUVT1T5UF202 X Tuner To have your order filled promptly and correctly, please furnish the following informations. 2. REF. NO. 4. DESCRIPTION Contact your nearest SHARP Parts Distributor to order. For location of SHARP Parts Distributor, Please call Toll-Free; 1800-BE-SHARP ★ MARK: SPARE PARTS-DELIVERY SECTION Ref. No.
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27F630 27F631 Ref. No. Part No. ★ Description Code Ref. No.
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27F630 27F631 Ref. No. Part No. ★ Description Code Ref. No.
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27F630 27F631 Ref. No. ★ Part No. Description Code Ref. No.
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27F630 27F631 Ref. No. Part No. ★ Description Code Ref. No.
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27F630 27F631 Ref. No. ★ Part No. Description Code Ref. No.
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27F630 27F631 Ref. No. ★ Part No. Description Code Ref. No.
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27F630 27F631 Ref. No. ★ Part No. Description Code Ref. No. Part No.
PAGE 35
27F630 27F631 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.
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27F630 27F631 COPYRIGHT © 2003 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. TQ1492-S Feb. 2003 Printed in Japan In Japan gedruckt Design and Production Information Design : JAPAN Production : SEMEX MY.