Sharp 25VT-K100 Service Manual

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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.

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

ELECTRICAL SPECIFICATIONS .............................................................................................................6

LOCATION OF USER'S CONTROL ......................................................................................................... 7

DISASSEMBLY AND REASSEMBLY ....................................................................................................... 9

INSTALLATION AND SERVICE INSTRUCTIONS .................................................................................. 12

PRECAUTIONS IN REASSEMBLING (Refer to 13VT-J100 Service Manual)

FUNCTION OF MAJOR MECHANICAL PARTS (Refer to 13VT-J100 Service Manual)

ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS

(Refer to 13VT-J100 Service Manual)

ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY (Refer to 13VT-J100 Service Manual)

TROUBLESHOOTING (Refer to 13VT-J100 Service Manual)

TROUBLESHOOTING OF TV SECTION ............................................................................................... 17

CHASSIS LAYOUT .................................................................................................................................20

BLOCK DIAGRAM OF TV SECTION ..................................................................................................... 23

BLOCK DIAGRAM OF VCR SECTION (Refer to 13VT-J100 Service Manual)

OVERALL SCHEMATIC DIAGRAM ........................................................................................................ 27

DESCRIPTION OF SCHEMATIC DIAGRAM .......................................................................................... 31

PRINTED WIRING BOARD ASSEMBLIES ............................................................................................ 45

REPLACEMENT PARTS LIST ................................................................................................................ 51

PACKING OF THE SET .......................................................................................................................... 70

SHARP CORPORATION

SERVICE MANUAL

TV/VCR COMBINATION

Chassis No. VN-80

MODELS

CONTENTS

This document has been published to be used for

after sales service only.

The contents are subject to change without notice.

S58Q325VTK100

25VT-K100

25VT-CK10

25VT-K100

25VT-CK10

Page

Table of Contents

Summary of Contents for Sharp 25VT-K100

Page 1: Table Of Contents
25VT-K100 25VT-CK10 SERVICE MANUAL S58Q325VTK100 TV/VCR COMBINATION Chassis No. VN-80 25VT-K100 25VT-CK10 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.
Page 2: Important Service Safety Precaution
25VT-K100 25VT-CK10 IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are thor- oughly familiar with all safety checks and servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOLTAGE LIMITS 1. For continued safety, no modification of any circuit 1.
Page 3 25VT-K100 25VT-CK10 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) » Connect the resistor connection to all exposed metal BEFORE RETURNING THE RECEIVER parts having a return to the chassis (Fire & Shock Hazard) (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC Before returning the receiver to the user, perform voltage drop across the resistor.
Page 4 25VT-K100 25VT-CK10 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.
Page 5 25VT-K100 25VT-CK10 PRECAUTIONS A PRENDRE LORS DE LA REPARATION (Suite) » Toucher avec la sonde d'essai les pièces métalliques VERIFICATIONS CONTRE L'INCEN-DIE ET exposées qui présentent une voie de retour au LE CHOC ELECTRIQUE châssis (antenne, coffret métallique, tête des vis, Avant de rendre le récepteur à...
Page 6: Electrical Specifications
25VT-K100 25VT-CK10 ELECTRICAL SPECIFICATIONS TV SECTION POWER INPUT: 120 V AC 60 Hz POWER RATING: 110W PICTURE SIZE Width: 63.4cm Height: 58.8cm Depth: 51.2cm 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...
Page 7: Location Of User's Control
25VT-K100 25VT-CK10 LOCATION OF USER'S CONTROL...
Page 8 25VT-K100 25VT-CK10 LOCATION OF USER'S CONTROL (Continued) Location Of Control’s Buttons (Remote Control)
Page 9: Disassembly And Reassembly
25VT-K100 25VT-CK10 DISASSEMBLY AND REASSEMBLY 1. Remove the 6 rear cover fixing screws and detach the rear cover. 2. Take out the anode cap, CRT PWB, connectors K,M and RC, coating ground SP chip, fixing screws and others. 3. Remove the 2 main PWB fixing screws and take out the main PWB unit and the VCR unit.
Page 10 25VT-K100 25VT-CK10 DISASSEMBLY AND REASSEMBLY (Continued) 5. Remove the 4 cassette housing control fixing screws, and detach the cassette housing control. 6. Remove the 4 mechanism chassis fixing screws, and detach the mechanism chassis PWB. 7. Remove the 8 main PWB fixing screws, and detach the main PWB.
Page 11 25VT-K100 25VT-CK10 DISASSEMBLY AND REASSEMBLY (Continued) For servicing any of the components inside, disconnect the lead dressing holder. Position the main PWB unit upright as shown below and connect the leads for starting the services. Note: Fit the VCR unit into the front cabinet with the front flap door tilted at 70~80°.
Page 12: Installation And Service Instructions
25VT-K100 25VT-CK10 INSTALLATION AND SERVICE INSTRUCTIONS Notes: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdriver or TV alignment tools. (2) Before performing adjustment, 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...
Page 13 25VT-K100 25VT-CK10 The SHARP TV/VCR COMBINATION have most of the analog setup adjustments eliminated. Coil and variable resistor adjustments are now performed digitally by using the remote transmitter or set’s volume and channel change function buttons. Note: There are still a few analog adjustments in the J-series such as 120V adjust, focus, master screen voltage and coils in the picture if/detector circuit.
Page 14 25VT-K100 25VT-CK10 Table-A ADJUSTMENT DATA ADJUSTMENT ITEM INTIAL VALUE RANGE COMMENTS PICTURE 0~63 TINT 0~77 COLOR 0~63 BRIGHT 0~63 SHARP 0~13 V-PHASE H-PHASE 0~31 RF-AGC 0~63 V-AMP 0~63 PIF-VCO 0~127 R CUT-OFF 0~255 G CUT -OFF 0~255 B CUT-OFF 0~255...
Page 15 25VT-K100 25VT-CK10 SERVICE ADJUSTMENT White balance adjustment VCO Adjustment 1. Have unit receive a good local channel. 2. Enter the service mode. select service adjustment 1. Connect a digital voltmeter between pin(44) of IC401 “COLOR” and set to “0” ( minimum color) . “COLOR”...
Page 16 25VT-K100 25VT-CK10 Vertical-size adjustment 1. Have unit receive a good local channel. 2. Enter the service mode and select service adjustment “V-AMP”. 3. While observing the top and bottom of the screen, adjust “V-AMP” data value to proper vertical size and linearity.
Page 17: Troubleshooting Of Tv Section
25VT-K100 25VT-CK10 TROUBLESHOOTING OF TV SECTION...
Page 18 25VT-K100 25VT-CK10...
Page 19 25VT-K100 25VT-CK10...
Page 20: Chassis Layout
25VT-K100 25VT-CK10 CHASSIS LAYOUT PWB-B CRT UNIT PWB-D VCR KEY UNIT PWB-E POWER SW UNIT PWB-F SENSOR UNIT PWB-C SUB POWER UNIT (25VT-CJ100. ONLY)
Page 21 25VT-K100 25VT-CK10 MODEL:25VT-K100 PWB-A MAIN UNIT...
Page 22 25VT-K100 25VT-CK10 MODEL:25VT-CK10 PWB-A MAIN UNIT...
Page 23: Block Diagram Of Tv Section
25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 MODEL 25VT-K100 BLOCK DIAGRAM OF TV SECTION...
Page 24 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 MODEL 25VT-CK10 BLOCK DIAGRAM OF TV SECTION...
Page 25: Overall Schematic Diagram
25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 MODEL 25VT-K100 OVERALL SCHEMATIC DIAGRAM...
Page 26 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 MODEL 25VT-CK10 OVERALL SCHEMATIC DIAGRAM...
Page 27: Description Of Schematic Diagram
25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 DESCRIPTION OF SCHEMATIC DIAGRAM SCHEMATIC DIAGRAM : CRT, SUB POWER Unit NOTES: WAVEFORM MEASUREMENT CONDITIONS: 1. The unit of resistance "ohm" is omitted 1. Photographs taken on a standard gated color bar (K:1000 ohms, M:1 Meg ohm).
Page 28 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 MODEL 25VT-K100 SCHEMATIC DIAGRAM : MAIN Unit (TV Section)
Page 29 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10...
Page 30 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 MODEL 25VT-CK10 SCHEMATIC DIAGRAM : MAIN Unit (TV Section)
Page 31 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10...
Page 32 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 SCHEMATIC DIAGRAM : MAIN, SENSOR Unit (VCR Section)
Page 33 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 SCHEMATIC DIAGRAM : MAIN Unit (VCR Section)
Page 34: Printed Wiring Board Assemblies
25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Side)
Page 35 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 PWB-A: MAIN Unit (Chip Parts Side)
Page 36 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 PWB-B: CRT Unit (Wiring Side) PWB-F: SENSOR Unit (Wiring Side) PWB-D: VCR KEY Unit (Wiring Side Side) PWB-E: POWER SW Unit (Wiring Side) PWB-C: SUB POWER Unit (Wiring Side) (25VT-CK10. ONLY)
Page 37: Replacement Parts List
1. NUMERO DU MODELE 2. NO. DE REF Contact your nearest SHARP Parts Distributor to order. 3. NO. DE PIECE 4. DESCRIPTION For location of SHARP Parts Distributor, Please call Toll-Free;1-800- in CANADA: Contact SHARP Electronics of Canada Limited BE-SHARP Phone (416) 890-2100...
Page 38 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code D455 VHD1SS119//-1 J Diode PWB-A DUNTK9523WEV0/V1 D457 RH-EX0631GEZZ J Zener Diode MAIN UNIT (Continued) D501 RH-DX0441CEZZ J Diode å D502 RH-DX0131CEZZ J Diode Q351 VS2SC2412KQ-1 2SC2412 çå...
Page 39 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code CAPACITORS PWB-A DUNTK9523WEV0/V1 EL...Electrolytic MAIN UNIT (Continued) VCEA0A1CW476M J 47 VCKYPA1HF103Z J 0.01 Ceramic COILS VCEAKA1HW105M J 1.0 VP-DF220K0000 J Peaking 22µH VCEAKA1HW225M J 2.2 L201 VP-XF1R2K0000 J Peaking 1.2µH...
Page 40 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C759 VCEA0A1CW476M J 47 PWB-A DUNTK9523WEV0/V1 C760 VCEA0A1CW476M J 47 MAIN UNIT (Continued) C768 VCEA0A1CW476M J 47 C769 VCEA0A1CW476M J 47 C426 VCEAKA1CW106M J 10 16V EL.
Page 41 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code C6606 VCKYCY1HB681K J 680p Ceramic PWB-A DUNTK9523WEV0/V1 C6607 VCEAKA1HW475M J 4.7 MAIN UNIT (Continued) C6608 VCEAKA1CW106M J 10 C6609 VCQYTA1HM683K J 0.068 50V Mylar C3105 VCCCCY1HH221J...
Page 42 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R307 VRS-CY1JF152J J 1.5k 1/16W M-Ox. PWB-A DUNTK9523WEV0/V1 R308 VRS-CY1JF271J J 270 1/16W M-Ox. MAIN UNIT (Continued) R313 VRS-CY1JF000J J 00 1/16W M-Ox. R315 VRS-CY1JF221J J 220 1/16W M-Ox.
Page 43 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R751 VRD-RA2BE104J J 100k 1/8W Carbon PWB-A DUNTK9523WEV0/V1 R752 VRD-RM2HD104J J 100k 1/2W Carbon MAIN UNIT(Continued) R753 VRD-RA2BE223J J 22k 1/8W Carbon R754 VRD-RA2BE563J J 56k...
Page 44 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R3142 VRS-CY1JF681J J 680 1/16W M-Ox. PWB-A DUNTK9523WEV0/V1 R3143 VRD-RA2BE562J J 5.6k 1/8W Carbon MAIN UNIT (Continued) R3144 VRS-CY1JF562J J 5.6k 1/16W M-Ox. R3145 VRS-CY1JF562J J 5.6k 1/16W M-Ox.
Page 45 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code R7776 VRS-CY1JF102J J 1.0k 1/16W M-Ox. PWB-A DUNTK9523WEV0/V1 R7781 VRS-CY1JF103J J 10k 1/16W M-Ox. MAIN UNIT (Continued) R7782 VRD-RA2BE102J J 1.0k 1/8W Carbon R7788 VRS-CY1JF103F J 10k 1/16W M-Ox.
Page 46 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-A DUNTK9523WEV0/V1 PWB-B DUNTK9284WEV0 MAIN UNIT (Continued) CRT UNIT FB731 RBLN-0037CEZZ J Balun TRANSISTORS FB732 RBLN-0057CEZZ J Balun Q853 VS2SC3619LB1E FB2001 RBLN-0037CEZZ J Balun Q854 VS2SC3619LB1E...
Page 47 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PWB-E DUNTK9055WEV9 PWB-C DUNTK9162WEV3 SUB POWER UNIT (For 25VT-CK10) POWER SW UNIT DIODE RESISTORS å VA1701 RH-VX0026CEZZ J Varistor R2502 VRD-RA2BE103J J 10k 1/8W Carbon RH-VX0019CEZZ...
Page 48 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code NPLYV0156AJZZ V Limitter Pulley Ass’y MECHANISM CHASSIS PARTS NROLP0110GEZZ J Guide Roller NSFTP0034AJZZ J Tension Pole Adjuster PGUMM0043AJZZ V Damper Raber LBNDK1009AJZZ V Tension Band Ass’y...
Page 49 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS...
Page 50 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code SCREW, NUT AND WASHERS CASSETTE HOUSING CONTROL PARTS LX-XZ3030GEFD J Screw CHLDX3074TEV0 V Cassette Housing XBPSD26P08000 J Screw Control Ass’y LX-HZ3082GEZZ J Audio/Control Head LANGF9592AJFW V Upper Plate...
Page 51 25VT-K100 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code CASSETTE HOUSING CONTROL PARTS...
Page 52 R Wire Holder - Not Available - – Cabinet-Front — LHLDW1019PEKZ R Wire Holder GCOVA0052PESA R Cover, R/C. LHLDW0017PEKZ R Wire Holder (25VT-K100) HBDGB1008MESA M Badge, SHARP å QACCD3042CESA J AC Cord HDECQ0079PESA R LED Decoration (25VT-K100) HDECQ0081PESC M Cassette Flap-Door...
Page 53 25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 CABINET AND MECHANICAL PARTS...
Page 54: Packing Of The Set
25VT-K100 25VT-K100 25VT-CK10 25VT-CK10 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING OF THE SET • SETTING POSITIONS OF THE KNOBS PACKING PARTS SUPLLIED ACSESSORIES Power SW (NOT REPLACEMENT ITEM) Channel RRMCG1330PESA R Infrared R/C Unit SPAKC0617MEZZ –...
Page 55 25VT-K100 25VT-CK10 Memo...
Page 56 25VT-K100 25VT-CK10 TQ0452-S YO. IK Printed in Japan...

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Sharp 25VT-K100 Service Manual

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