Service manual

ManualsBrandsSharp ManualsTV25K-M100

25K-S100/180/S100/S180

CK25M10,CK25S18

SERVICE MANUAL

COLOR TELEVISION

Chassis No. SN-81

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.

S20L625K-M100

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

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

» LOCATION OF USER'S CONTROL .................................................................................................... 6

» INSTALLATION AND SERVICE INSTRUCTIONS ............................................................................ 10

» CHASSIS LAYOUT ........................................................................................................................... 16

» BLOCK DIAGRAM ............................................................................................................................ 19

» SCHEMATIC DIAGRAMS ................................................................................................................. 22

» PRINTED WIRING BOARD ASSEMBLIES ....................................................................................... 37

» REPLACEMENT PARTS LIST .......................................................................................................... 42

» PACKING OF THE SET .................................................................................................................... 57

Page

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

POWER RATING .................................................................. 115 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

25K-M100/180, CK25M10 .. 1.3W +1.3W (at 10% distortion and

Dual CH Operate)

25K-S100/180, CK25S18 ............... 1.3W (at 10% distortion and

Dual CH Operate)

Specifications are subject to change without

prior notice.

SPEAKER

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

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.)

25K-S100/180

CK25S18

25K-M100/180

CK25M10

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

ELECTRICAL SPECIFICATIONS

CONTENTS

25K-M100/180, 25K-S100/180

CK25M10, CK25S18

MODELS

Summary of content (48 pages)

PAGE 1
25K-S100/180/S100/S180 CK25M10,CK25S18 SERVICE MANUAL S20L625K-M100 COLOR TELEVISION Chassis No. SN-81 25K-M100/180 CK25M10 25K-S100/180 CK25S18 MODELS 25K-M100/180, 25K-S100/180 CK25M10, CK25S18 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......................................................................
PAGE 2
5K-S100/180/S100/S180 CK25M10,CK25S18 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.
PAGE 3
25K-S100/180/S100/S180 CK25M10,CK25S18 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 ine cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these check.
PAGE 4
25K-S100/180/S100/S180 CK25M10,CK25S18 PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. AVERTISSEMENT LIMITES DES RADIATIONS X ET DE LA HAUTE TENSION 1. N'entreprendre aucune modification de tout circuit. C'est dangereux. 2. Débrancher le récepteur avant toute réparation. 3.
PAGE 5
25K-S100/180/S100/S180 CK25M10,CK25S18 PRECAUTIONS A PRENDRE LORS DE LA REPARATION (Suite) • Toucher avec la sonde d'essai les pièces métalliques exposées qui présentent une voie de retour au châssis (antenne, coffret métallique, tête des vis, arbres de commande et des boutons, écusson, etc.) et mesurer la chute de tension CA en-travers de la résistance. Toutes les vérifications doivent être refaites après avoir inversé la fiche du cordon d'alimentation.
PAGE 6
25K-S100/180/S100/S180 CK25M10,CK25S18 LOCATION OF USER'S CONTROL (25K-M100, CK25M10) 6
PAGE 7
25K-S100/180/S100/S180 CK25M10,CK25S18 LOCATION OF USER'S CONTROL(Continued) (25K-M180) 7
PAGE 8
25K-S100/180/S100/S180 CK25M10,CK25S18 LOCATION OF USER'S CONTROL(Continued) (25K-S100) 8
PAGE 9
25K-S100/180/S100/S180 CK25M10,CK25S18 LOCATION OF USER'S CONTROL(Continued) (25K-S180, CK25S18) 9
PAGE 10
25K-S100/180/S100/S180 CK25M10,CK25S18 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.
PAGE 11
25K-S100/180/S100/S180 CK25M10,CK25S18 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.
PAGE 12
25K-S100/180/S100/S180 CK25M10,CK25S18 SERVICE NUMBER DATA ADJUSTMENT ITEM INITIAL VALUE ADJUSTMENT CONTENTS RANGE S01 S02 S03 S04 S05 S06 S07 S08 S09 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 OP PICTURE TINT COLOR BRIGHTNESS SHARPNESS VERTICAL PHASE HORIZONTAL PHASE RF-AGC VERTICAL AMP VCO R CUT-OFF G CUT -OFF B CUT-OFF G GAIN B GAIN TRAP(3.58MHz) BALANCE C.C.
PAGE 13
25K-S100/180/S100/S180 CK25M10,CK25S18 SERVICE ADJUSTMENT VCO Adjustment White Balance Adjustment 1. Connect a digital voltmeter between pin (44) of IC201 and ground. 2. Receive a good local channel. 3. Enter the service mode and select the service adjustment "S10". 4. Adjust the data so that digital voltmeter reads 2.2V. 5. Adjustment is completed, remove the voltmeter, return to "normal" mode. 1. Receive a good local channel. 2.
PAGE 14
25K-S100/180/S100/S180 CK25M10,CK25S18 Sub-Brightness Adjustment Caption Position Adjustment (Horizontal) 1. Receive a good local channel. 2. Make sure the customer brightness control is set to center position. 3. Enter the service mode and select the service adjustment "S04". 4. Adjust "S04" data value to obtain normal brightness level. 1. Receive a good local channel. 2. Enter the service mode and select the service adjustment "S18". 3. A black text box appears on the screen. (see Figure B below) 4.
PAGE 15
25K-S100/180/S100/S180 CK25M10,CK25S18 MTS ADJUSTMENT (Only for 25K-S100/180, CK25S18) MTS Level Adjustment 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. MTS VCO Adjustment 1. Keep the unit in no-signal state. 2. Connect the frequency counter to pin (39) of IC3001. 3.
PAGE 16
25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-M100, CK25M10 CHASSIS LAYOUT PWB-B H PWB-H G PWB-A F E D C B A 1 2 3 4 16 5 6
PAGE 17
25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-M180 CHASSIS LAYOUT PWB-B H PWB-H G PWB-A F E D C B A 1 2 3 4 17 5 6
PAGE 18
25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-S100/180, CK25S18 CHASSIS LAYOUT PWB-B H PWB-H G PWB-A F E D C B A 1 2 3 4 18 5 6
PAGE 19
25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-M100, CK25M10 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 19 5 6
PAGE 20
25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-M180 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 20 5 6
PAGE 21
25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-S100/180, CK25S18 BLOCK DIAGRAM H G F E D C B A 1 2 3 4 21 5 6
PAGE 22
25K-S100/180/S100/S180 CK25M10,CK25S18 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.
PAGE 23
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 SCHEMATIC DIAGRAM: CRT Unit SCHEMATIC DIAGRAM: FRONT AV Unit H H G G F F E E (25K-M100/180, CK25M10) (25K-S100/180, CK25S18) D D C C B B A A 11 22 3 3 4 4 23 5 5 6 6 7 1 8 2 9 3 10 4 24 115 12 6
PAGE 24
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-M100, CK25M10 SCHEMATIC DIAGRAM: MAIN-1 Unit H (DUNTK9509WEK0)…25K-M100 (DUNTK9509WEK8)…CK25M10 G F E D C B A 1 2 3 25 4 5 6 7 8 9 10 26 11 12
PAGE 25
K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-M100, CK25M10 SCHEMATIC DIAGRAM: MAIN-2 Unit (DUNTK9509WEK0)…25K-M100 (DUNTK9509WEK8)…CK25M10 H G F E D C B A 1 2 3 4 27 5 6 7 8 9 10 28 11 12
PAGE 26
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 MODEL 25K-M180 SCHEMATIC DIAGRAM: MAIN-1 Unit H (DUNTK9509WEK1) G F E D C B A 1 2 3 29 4 5 6 7 8 9 10 30 11 12
PAGE 27
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 MODEL 25K-M180 SCHEMATIC DIAGRAM: MAIN-2 Unit H (DUNTK9509WEK1) G F E D C B A 1 2 3 4 31 5 6 7 8 9 10 32 11 12
PAGE 28
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-S100/180, CK25S18 SCHEMATIC DIAGRAM: MAIN-1 Unit H (DUNTK9509WEK2)…25K-S100 (DUNTK9509WEK3)…25K-S180 (DUNTK9509WEK9)…CK25S18 G F E D C B A 1 2 3 33 4 5 6 7 8 9 10 34 11 12
PAGE 29
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 MODELS 25K-S100/180, CK25S18 SCHEMATIC DIAGRAM: MAIN-2 Unit H (DUNTK9509WEK2)…25K-S100 (DUNTK9509WEK3)…25K-S180 (DUNTK9509WEK9)…CK25S18 G F E D C B A 1 2 3 4 35 5 6 7 8 9 10 36 11 12
PAGE 30
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 PRINTED WIRING BOARD ASSEMBLIES H G F E D C B A PWB-A: MAIN Unit (Wiring Side) 1 2 3 37 4 5 6 7 8 9 10 38 11 12
PAGE 31
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 H G F E D C B A PWB-A: MAIN Unit (Chip Parts Side) 1 2 3 4 39 5 6 7 8 9 10 40 11 12
PAGE 32
25K-S100/180/S100/S180 CK25M10,CK25S18 25K-S100/180/S100/S180 CK25M10,CK25S18 PARTS LIST LISTE DES PIECES PARTS REPLACEMENT CHANGE DES PIECES HH 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.
PAGE 33
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No.
PAGE 34
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code Ref. No.
PAGE 35
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code Ref. No.
PAGE 36
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No. PWB-A: DUNTK9509WEK0 (25K-M100) PWB-A: DUNTK9509WEK1 (25K-M180) PWB-A: DUNTK9509WEK8 (CK25M10) MAIN UNIT (Continued) å R302 R303 R356 VRS-CY1JF102J VRD-MN2BE153J VRS-CY1JF472J J 1k J 15k J 4.7k 1/16W 1/8W 1/16W M-Ox. Carbon M-Ox.
PAGE 37
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No.
PAGE 38
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code Ref. No.
PAGE 39
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code Ref. No.
PAGE 40
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No. PWB-A: DUNTK9509WEK2 (25K-S100) PWB-A: DUNTK9509WEK3 (25K-S180) PWB-A: DUNTK9509WEK9 (CK25S18) MAIN UNIT (Continued) C507 C508 C510 C511 C512 C513 C514 C551 C552 C603 C604 çå C607 çå C608 C612 C614 C631 C632 C633 C652 C653 å C701 C702 C703 C704 å C705 å C706 C707 C708 C709 å C713 C714 çå C715 C717 C721 C722 C751 C753 C754 C756 RC-QZA103TAYK J 0.
PAGE 41
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No. PWB-A: DUNTK9509WEK2 (25K-S100) PWB-A: DUNTK9509WEK3 (25K-S180) PWB-A: DUNTK9509WEK9 (CK25S18) MAIN UNIT (Continued) å RJ14 RJ15 RJ16 VRD-MN2BE000J VRS-CY1JF000J VRD-MN2BE000J J 0 J 0 J 0 1/8W 1/16W 1/8W Carbon M-Ox.
PAGE 42
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No.
PAGE 43
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code Ref. No. PWB-A: DUNTK9509WEK2 (25K-S100) PWB-A: DUNTK9509WEK3 (25K-S180) PWB-A: DUNTK9509WEK9 (CK25S18) MAIN UNIT (Continued) J 2.2k J 3.3k J 1k 1/8W 1/8W 1/16W Carbon Carbon M-Ox.
PAGE 44
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code Ref. No. PWB: DUNTK9510WEK0 å CRT UNIT TRANSISTORS Q851 Q852 Q853 Q854 Q855 Q856 Q881 VS2SC3198-Y-1 VS2SC3789//2E or VS2SC3619LB1E VS2SC3198-Y-1 VS2SC3789//2E or VS2SC3619LB1E VS2SC3198-Y-1 VS2SC3789//2E or VS2SC3619LB1E VS2SA1266-Y-1 J 2SC3198 (Y) M 2SC3798 AA 2SC3619 J 2SC3198 (Y) J 2SC3789 2SC3619 J 2SC3198 (Y) J 2SC3789 AA 2SC3619 J 2SA1266 (Y) AA J Peaking 82µH AB CAPACITORS C883 [EL.
PAGE 45
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No. PWB-H: DUNTK9310WEK0 (25K-M100/180, CK25M10) PWB-H: DUNTK9310WEK1 (25K-S100/180, CK25S18) FRONT AV UNIT J1001 QJAKE0053GEZZ J1002 QJAKE0055GEZZ J Jack, Video in J Jack, Audin in (L) (25K-S100/180, CK25S18) J1003 QJAKE0059GEZZ J Jack, Audin in (R) P1001 QPLGN0541CEZZ J Plug, 5-pin (HA) Part No.
PAGE 46
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code Ref. No. ★ Part No.
PAGE 47
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. ★ Part No. Description Code No. Part No. PACKING OFRef. THE SET ★ Description Code ★ Polystyrene Bag Operation Manual Guarantee Card Infrared R/C Unit Batteries ★ Polyethylene Sack ★ Buffer Material FRONT ★ Packing Case ★ Serial Number Label Use 22 staples fix the packing case. ★ Bar Code Label REAR ★ Number Card MARK ★ : Not replacement items.
PAGE 48
25K-S100/180/S100/S180 CK25M10,CK25S18 Ref. No. Part No. ★ Description Code Ref. No. ★ Part No. Description Code COPYRIGHT © 1998 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrleval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.