Service manual

ManualsBrandsSharp ManualsTV14MR10

14LK22

COLOR TELEVISION

Chassis No. MSA

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.

S71X114LK22//

» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1

» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................................2

» LOCATION OF USER'S CONTROL .....................................................................................................4

» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 5

» CHASSIS LAYOUT .............................................................................................................................13

» BLOCK DIAGRAM ..............................................................................................................................14

» DESCRIPTION OF SCHEMATIC DIAGRAMS ....................................................................................15

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 19

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

» PACKING OF THE SET ......................................................................................................................27

Page

CONTENTS

SERVICE MANUAL

MODEL

POWER INPUT ........................................ 110-220 V AC 50/60 Hz

POWER RATING ....................................................................53 W

PICTURE SIZE ........................................... 574cm

(88.97sq 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 ................................ 0.9W (at 10% distortion)

ELECTRICAL SPECIFICATIONS

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

Specifications are subject to change without

prior notice.

SHARP CORPORATION

14LK22

Summary of content (27 pages)

PAGE 1
4LK22 SERVICE MANUAL S71X114LK22// COLOR TELEVISION Chassis No. MSA MODEL 14LK22 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
14LK22 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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14LK22 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 and etc.) and measure the AC voltage drop across the resistor. AII checks must be repeated with the AC ine 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.
PAGE 4
14LK22 LOCATION OF USER'S CONTROL Front Panel VIDEO/AUDIO IN TERMINALS (VIDEO/AUDIO terminals are also provided on the rear.) CHANNEL UP/DOWN POWER Press ® ® On. Press again Off. ( ) Selects next higher channel. ( ) Selects next lower channel. ON TIMER indicator VOLUME UP/DOWN (+) Increases sound. SENSOR AREA FOR REMOTE CONTROL (Ð) Decreases sound. MENU Press ® ® Accesses MAIN MENU. Press again Exits MAIN MENU.
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14LK22 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 3.15A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.
PAGE 6
14LK22 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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14LK22 SERVICE MODE (1) In the Service Mode, Key is used to select the mode in the following oreder. AGC & GEOMETRIC MODE WHITE POINT ADJ. MODE SUB ADJ. MODE OFFSET ADJ. MODE FEATURE OPTION MODE IC OPTION MODE AGC & GEOMETRIC MODE WHITE POINT ADJ.
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14LK22 MTS OFFSET ADJ. MODE ADJ. MODE ↓ Y-D TIME (TV) [ YD ] (DL-TV) ↓ Y-D TIME (AV) [ YD ] (DL-AV) ↓ INITIAL/DEFAULT LANGUAGE (INIT) ↓ FAO-MAX VOLUME (FAO-VOL) ↓ ENERGY SAVE OFFSET (ESV_OFFS) ↓ CLOSE CAPTION POSITION (CCPOS) ↓ ATTENUATE INPUT SIGNAL LEVEL (ATT) ↓ VCO FREE RUNNING FREQUENCY ADJ. (VCO) ↓ STEREO, SAP, DBX FILTER ADJ.
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14LK22 SERVICE MODE SERVICE POSITION ADJUST ITEM AGC V-LIN V-AMP V-CENT V-ZOOM H-CENT H-SIZE EW// PARA COR(U) COR(L) TRAPE HB S-COR DRI-R-HI DRI-G-HI DRI-B-HI DRI-R-MH DRI-G-MH DRI-B-MH DRI-R-ML DRI-G-ML DRI-B-ML DRI-R-LO DRI-G-LO DRI-B-LO SUB-VOL SUB-CON SUB-COL SUB-BRI SUB-TINT SUB-SHP HTL-VOL HTL-PRG BB-CON RGB CUT-R CUT-G CDL DL-TV DL-AV INIT AGC TAKE OVER POINT VERTICAL SLOPE VERTICAL AMP VERTICAL SHIFT VERTICAL ZOOM HORIZONTAL SHIFT EAST-WEST WIDTH HORIZONTAL PARALLELOGRAM EAST-WEST PARABOLA / WID
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14LK22 DATA SERVICE POSITION ADJUST ITEM FMWS SM0 SM1 AGC0 AGC1 FOA-FE FOB-FE FOA-AV FOB-AV FSL HP2 RGBL V-CHIP MTS DEMO CLOCK E-SAVE P_PREF UNIV+ SPEAKER FAO VIEW-TM FRENCH EZ-SETUP FM WINDOW SELECTION SOUND MUTE BIT 0 (SM0) SOUND MUTE BIT 1 IF AGC SPEED BIT 0 IF AGC SPEED BIT 1 PHI 1 TIME CONSTANT FOR FE PHI 1 TIME CONSTANT FOR FE PHI 1 TIME CONSTANT FOR AV PHI 1 TIME CONSTANT FOR AV FORCED SLICING LEVEL FOR VERTICAL SYNC.
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14LK22 Ë SERVICE ADJUSTMENT RF AGC Adjustment 1. Receive a good local channel. 2. Enter the service mode signal category and select the service adjustment "AGC". 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. CHROMA ADJUSTMENT No. Adjusting point 1 SUB-TINT (I2C BUS CONTROL) Adjusting procedure/conditions 1. Receive the "Colour Bar" signal through AV in. 2. Connect the oscilloscope to TP853 (Pin (5) of P882) BLUE-OUT.
PAGE 12
14LK22 CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT No. Adjusting point 1 CRT CUTOFF ADJUSTMENT (I2C BUS CONTROL) Adjusting procedure/conditions 1. Switch TV to VIDEO mode,BLUE BACK OFF, with NO VIDEO signal. 2. Press R/C to set Picture Normal condition. 3. Connect the oscilloscope to Red OUT from IC801.(TP47R) Range Sweep Waveform and others 3.0Vdc : 1 V/Div (DC) : 5 msec/Div 1V 4. Adjust SCREEN VR ,so that the tip of signal reach 3.0 Vdc + 0.1 Vdc.
PAGE 13
14LK22 CHASSIS LAYOUT H G F E D C B A 1 2 3 4 13 5 6
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LK22 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 14 5 6
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14LK22 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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SCHEMATIC DIAGRAM: MAIN Unit J I H G F E D C B A 1 2 3 4 5 6 7 8 9 10 11 16~17 12 13 14 15 16 17 18 19 20
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14LK22 SCHEMATIC DIAGRAM: CRT Units H G F E D C B A 1 2 3 4 18 5 6
PAGE 18
14LK22 PRINTED WIRING BOARD ASSEMBLIES H G F PWB-B: CRT Unit (Wiring Side) E D C PWB-B: CRT Unit (Chip Parts Side) B A 1 2 3 4 19 5 6
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14LK22 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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14LK22 H G F E D C B A PWB-A: MAIN Unit (Chip Parts Side) 1 2 3 4 21 5 6
PAGE 21
14LK22 Ref. No. Part No. ★ Description PARTS LIST Code Ref. No. TUNER NOTE : THE PARTS HERE SHOWN ARE SUPPLIED AS AN ASSEMBLY BUT NOT INDEPENDENTLY. å TU201 VTUENV56D82-1 J Tuner or VTUVTST5UF770 "HOW TO ORDER REPLACEMENT PARTS" 4. DESCRIPTION AZ INTEGRATED CIRCUITS To have your order filled promptly and correctly, please furnish the following informations. 3. PART NO.
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14LK22 Ref. No. ★ Part No. Description Code Ref. No. PWB-A: DUNTKA541WEA1 C531 C532 C533 C601 C602 C603 C604 C605 C606 C607 C608 C610 C611 C612 C620 C640 C651 C652 C653 C654 C655 C656 C657 C658 C701 MAIN UNIT (Continued) D1022 RH-EX0263TAZZ D1023 RH-EX0263TAZZ å VA701 RH-VX0073CEZZ J Zener Diode, 8.3V J Zener Diode, 8.3V X Varistor AB AB AF PACKAGED CIRCUITS PR702 RMPTP0028CEZZ J Packaged Circuit X1001 RCRSB0300CEZZ J Crystal AG AF FILTERS CF253 RFiLC0446CEZZ SF201 RFiLC0405CEZZ J Filter J S.
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14LK22 Ref. No. Part No. ★ Description Code Ref. No.
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14LK22 Ref. No. ★ Part No. Description Code Ref. No.
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14LK22 Ref. No. Part No. ★ Description Code Ref. No. MISCELLANEOUS PARTS å ACC701 QACCZ3008PEZZ J AC Cord SP301 VSP0080PBQ9YA X Speaker, 32 ohm QCNW-2206PEZZ R Connecting Cord ★ Part No.
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14LK22 Ref. No. Part No. ★ Description Code Ref. No. Part No. PACKING OF THE SET ★ Description ★ Polyethylene Bag Operation Manual Infrared R/C Unit ★ Batteries ★ Wrapping Paper ★ Buffer Material FRONT ★ Packing Case Use tape to fix top side of pack case. REAR Use 12 staples fix the packing case. ★ MARK : Not Replacement Items.
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14LK22 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 SEM P SEMEX TQ1196-S Aug. 2001 Printed in Japan MI.