Service manual

ManualsBrandsSharp ManualsCRT TV25R S100

25R-S100

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 .......................................................................................19

» REPLACEMENT PARTS LIST ...........................................................................................................22

» PACKING OF THE SET .....................................................................................................................29

Page

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

CONTENTS

MODEL

ELECTRICAL SPECIFICATIONS

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

POWER RATING ..................................................................100 W

PICTURE SIZE ........................................... 2,032cm

(315sq 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 ..................... 1.5 W+1.5 W (at 10% distortion and

Dual CH Operate)

SPEAKER

SIZE ...................................................................... 8 cm (Round)

VOICE COIL IMPEDANCE............................. 32 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.)

Specifications are subject to change without

prior notice.

25R-S100

COLOR TELEVISION

Chassis No. SN-012

S21P825R-S100

SERVICE MANUAL

Summary of content (28 pages)

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25R-S100 SERVICE MANUAL S21P825R-S100 COLOR TELEVISION Chassis No. SN-012 MODEL 25R-S100 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 .................................
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5R-S100 IMPORTANT SERVICE SAFETY PRECAUTION 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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25R-S100 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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25R-S100 LOCATION OF USER'S CONTROL Front Panel POWER Press → On. Press again → Off. VIDEO/AUDIO IN2 TERMINALS SENSOR AREA FOR REMOTE CONTROL MENU Press → Accesses MAIN MENU. Press again → Exits MAIN MENU. VOLUME UP/DOWN (+) Increases sound. (–) Decreases sound. CHANNEL UP/DOWN ( ) Selects next higher channel. ( ) Selects next lower channel. • Press both at the same time to access the MAIN MENU screen. Basic Remote Control Functions Infrared Transmitter Window POWER Press → On. Press again → Off.
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25R-S100 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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25R-S100 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. To enter the service mode and exit service mode. While pressing the Vol-up and Ch-up buttons at the sametime, plug the AC cord into a wall socket. Now, the TV set is switched on and enters the service mode.
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25R-S100 Below are the adjustments ranges and initial values for FIX VALUE category.
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25R-S100 SIGNAL SERVICE POSITION S01 S02 DATA ADJUST ITEM RANGE INITIAL VALUE RF AGC VIDEO LEVEL 00-3F 00-07 14 03 S03 Y-MUTE 00-03 00 S04 S05 S06 S07 S08 S09 S10 S11 S12 S13 S14 SUB BIAS R-BIAS G-BIAS B-BIAS R-DRIVE B-DRIVE CONTRAST TINT COLOR BRIGHTNESS BRIGHTNESS 2 00-FF 00-FF 00-FF 00-7F 00-7F 00-7F 00-7F 00-7F 00-7F 00-7F 00-7F 30 00 00 00 53 53 5A 40 40 40 40 ADJUSTMENT CONTENTS "01": Y-MUTE, "02": V-STOP & Y-MUTE "03": Activate color killer circuit.
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25R-S100 Ë SERVICE ADJUSTMENT 4. Select the service adjustment "S03" and set the data value to "01" to turn off the luminance signal (Y-mute). 5. Select the service adjustment "S14" and adjust the data value to obtain 2.35 volts as shown in Figure B. 6. Adjust the master screen control until the raster darkens to the point where raster is barely seen. 7. Adjust the service adjustment "S05" red, "S06" green, "S07" blue to obtain a good grey scale with normal white at low brightness level. 8.
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25R-S100 Ë MTS ADJUSTMENT MTS Level Adjustment Vertical-Size, V-Linearity and V-S Correction Adjustments 1. Feed the following monaural signal to pin (14) of IC3001. Monaural signal: 300Hz, 245mVrms 2. Connect the rms voltmeter to pin (39) of IC3001. 3. Enter the service mode and select the service adjustment "M01". 4. Adjust the data so that the rms voltmeter reads 490 ±10mVrms. 1. Receive a good local channel. 2.
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25R-S100 CHASSIS LAYOUT PWB-B H G PWB-A F E D C B A 1 2 3 4 11 5 6
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25R-S100 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 12 5 6
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25R-S100 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.
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25R-S100 SCHEMATIC DIAGRAM: MAIN-1 Unit H G F E D C B A 1 2 3 14 4 5 6 7 8 9 10 11 15 12
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25R-S100 SCHEMATIC DIAGRAM: MAIN-2 Unit H G F E D C B A 1 2 3 16 4 5 6 7 8 9 10 11 17 12
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25R-S100 SCHEMATIC DIAGRAM: CRT Unit H G F E D C B A 1 2 3 4 18 5 6
PAGE 17
25R-S100 PRINTED WIRING BOARD ASSEMBLIES H G F E D PWB-B: CRT Unit (Wiring Side) C B A 1 2 3 4 19 5 6
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25R-S100 H G F E D C B A PWB-A: MAIN Unit (Wiring Side) 1 2 3 4 20 5 6
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25R-S100 H G F E D C B A PWB-A: MAIN Unit (Chip Parts Side) 1 2 3 4 21 5 6
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25R-S100 Ref. No. Part No. ★ Description Code Ref. No. PWB-A DUNTKA462WEV1 – MAIN Unit PWB-B DUNTK9510WEW2 – CRT Unit Replacement parts which have these special safety characteristics identified in this manual; electrical components having such features are identified by å and shaded areas in the Replacement Parts Lists and Schematic Diagrams.
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25R-S100 Ref. No. ★ Part No. Description Code Ref. No.
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25R-S100 Ref. No. Part No. ★ Description Code Ref. No. PWB-A: DUNTKA462WEV1 C653 C654 C662 å C701 MAIN UNIT (Continued) TRANSFORMERS å T601 'å å T602 T702 RTRNZ0057PEZZ R Transformer or RTRNZ0731CEZZ RTRNF0049MEZZ X H-Volt Transformer RTRNW0001GJZZ X Transformer AK AY AN C702 CONTROLS 'å R738 RVR-M4588CEZZ+ X 22k (B) 130V Adj. or RVR-M4628GEZZ or RVR-M4336CEZZ AE C703 å C705 å C706 CAPACITORS [EL. ··· Electrolytic, M-Poly.··· Metalized Polypro Film] C51 VCEA0A1AW108M J 1000 10V EL.
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25R-S100 Ref. No. ★ Part No. Description Code Ref. No.
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25R-S100 Ref. No. Part No. ★ Description Code Ref. No.
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R-S100 Ref. No. Part No. ★ Description Code Ref. No.
PAGE 26
25R-S100 Ref. No. Part No. ★ Description Code Ref. No. Part No.
PAGE 27
25R-S100 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. MARK ★ : Not replacement items.
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25R-S100 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. SHARP CORPORATION AV Systems Group Quality & Reliability Control Center Yaita, Tochigi 329-2193, Japan D JAPAN P SEMEX TQ1104-S Apr. 2001 Printed in Japan MI.