Sharp 21MJ50 Service Manual
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Sharp 21MJ50 Service Manual

Sharp 21MJ50 Service Manual

Color television
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POWER
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.
POWER INPUT ........................... 120 V AC 60 Hz
POWER RATING ........................................... 93W
PICTURE SIZE ..................... 1240cm
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
AUDIO POWER
OUTPUT RATING 1.3+1.3W (at 10% distortion &
dual ch operate)
» ELECTRICAL SPECIFICATIONS ............................................................................................. 1
» IMPORTANT SERVICE SAFETY PRECAUTION .................................................................... 2
» LOCATION OF USER'S CONTROL ......................................................................................... 6
» INSTALLATION AND SERVICE INSTRUCTIONS .................................................................... 7
» CHASSIS LAYOUT ................................................................................................................ 13
» BLOCK DIAGRAM ................................................................................................................. 14
» SCHEMATIC DIAGRAMS ...................................................................................................... 15
» PRINTED WIRING BOARD ASSEMBLIES ............................................................................ 21
» REPLACEMENT PARTS LIST ............................................................................................... 29
» PACKING OF THE SET ......................................................................................................... 37
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135
SHARP ELECTRONICS OF CANADA LTD.
335 Britannia Road East Mississauga, Ontario L4Z 1W9 Canada

SERVICE MANUAL

MODELS
ELECTRICAL SPECIFICATIONS
2
(192sq inch)
(Nominal)
CONTENTS

SHARP CORPORATION

1
COLOR TELEVISION
Chassis No. SN-70
20J-S100/S100S
CJ20S10
21MJ50
SPEAKER
SIZE ................................................ 8cm(Round)
VOICE COIL IMPEDANCE ....... 8ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ............................ 75 ohm Unbalanced
TUNING RANGES
VHF-Channels ....................................... 2thru 13
UHF-Channels .................................... 14thru 69
CATV Channels ................................... 1thru 125
USA: (EIA, Channel Plan)
Specifications are subject to change without prior
notice.
20J-S100/100S
CJ20S10/21MJ50
S77B620J-S100
Page

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Summary of Contents for Sharp 21MJ50

  • Page 1: Table Of Contents

    » REPLACEMENT PARTS LIST ....................29 » PACKING OF THE SET ......................37 SHARP ELECTRONICS CORPORATION Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135 SHARP ELECTRONICS OF CANADA LTD. 335 Britannia Road East Mississauga, Ontario L4Z 1W9 Canada SHARP CORPORATION...

  • Page 2: Important Service Safety Precaution

    20J-S100/100S CJ20S10/21MJ50 IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are thoroughly 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 should be attempted.

  • Page 3: Safety Notice

    20J-S100/100S CJ20S10/21MJ50 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) » Connect the resistor connection to all exposed metal BEFORE RETURNING 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 Before returning the receiver to the user, perform AC voltage drop across the resistor.
  • Page 4 20J-S100/100S CJ20S10/21MJ50 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 20J-S100/100S CJ20S10/21MJ50 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: Location Of User's Control

    20J-S100/100S CJ20S10/21MJ50 LOCATION OF USER'S CONTROL POWER VIDEO/AUDIO IN TERMINALS (25J-S100: VIDEO/AUDIO terminals are also provided on the rear.) (Model : 20J-S100) SENSOR AREA FOR REMOTE CONTROL – VOL + POWER POWER Press → ON. VOLUME UP/DOWN CHANNEL UP/DOWN Press again → OFF.

  • Page 7: Installation And Service Instructions

    20J-S100/100S CJ20S10/21MJ50 INSTALLATION AND SERVICE INSTRUCTIONS Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdriver or TV alignment tools. 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),...
  • Page 8 20J-S100/100S CJ20S10/21MJ50 For adjustments of this model, the bus data is convered 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 service adjustment is required. See Figure "B" to determine if service adjust- ments are required.
  • Page 9 20J-S100/100S CJ20S10/21MJ50 DATA SERVICE ADJUSTMENT ITEM ADJUSTMENT CONTENTS NUMBER RANGE INITIAL VALUE PICTURE 00-7F TINT 00-7F COLOR 00-7F BRIGHTNESS 00-7F SHARPNESS 00-3F Must be set to “24” VERTICAL PHASE 00-07 HORIZONTAL PHASE 00-1F RF-AGC 00-3F VERTICAL AMP 00-3F 00-7F R CUT-OFF...
  • Page 10 20J-S100/100S CJ20S10/21MJ50 Ë Ë Ë Ë Ë adjustment VCO Adjustment White balance adjustment 1. Connect a digital voltmeter between pin (44) of IC201 1. Have unit receive a good local channel. and ground. 2. Enter the service mode. select service adjustment 2.
  • Page 11 20J-S100/100S CJ20S10/21MJ50 Caption position adjustment (horizontal) MTS level adjustment 1. Have unit receive a good local channel. 1. Feed the following monaural signal to pin (14) of 2. Enter the service mode and select service adjustment IC3001. "S18". Monaural signal: 300Hz,245mVrms 3.

  • Page 12: Description Of Schematic Diagram

    20J-S100/100S CJ20S10/21MJ50 DESCRIPTION OF SCHEMATIC DIAGRAM NOTE: WAVEFORM MEASUREMENT CONDITIONS: 1. The unit of resistance "ohm" is omitted (K:1000 1. Photographs taken on a standard gated color bar ohms, M:1 Meg ohm). signal, the tint setting adjusted for proper color. The 2.

  • Page 13: Chassis Layout

    20J-S100/100S CJ20S10/21MJ50 CHASSIS LAYOUT...

  • Page 14: Block Diagram

    20J-S100/100S CJ20S10/21MJ50 BLOCK DIAGRAM...

  • Page 15: Schematic Diagrams

    20J-S100/100S 20J-S100/100S CJ20S10/21MJ50 CJ20S10/21MJ50 SCHEMATIC DIAGRAM :CRT Unit...
  • Page 16 20J-S100/100S CJ20S10/21MJ50 CJ20S10/21MJ50 SCHEMATIC DIAGRAM: MAIN Unit: 20J-S100, 21MJ50, CJ20S10 IX 2 70 1 C E N 1 – 2 0 J S 1 0 0 /C J 2 0 S 1 0 IX 2 57 3 C E – 21 M J 5 0...
  • Page 17 20J-S100/100S 20J-S100/100S CJ20S10/21MJ50 CJ20S10/21MJ50 SCHEMATIC DIAGRAM: MAIN Unit: 20J-S100S...
  • Page 18 20J-S100/100S 20J-S100/100S CJ20S10/21MJ50 CJ20S10/21MJ50 PRINTED WIRING BOARD ASSEMBLIES: 20J-S100, 21MJ50, CJ20S10 PWB-B:CRT Unit (Wiring Side) PWB-E:MTS Unit (Wiring Side) PWB-A:MAIN Unit (Wiring Side)
  • Page 19 20J-S100/100S 20J-S100/100S CJ20S10/21MJ50 CJ20S10/21MJ50 PWB-B:CRT Unit (Chip Parts Side) PWB-E:MTS Unit (Chip Parts Side) PWB-A:MAIN Unit (Chip Parts Side)
  • Page 20 20J-S100/100S 20J-S100/100S CJ20S10/21MJ50 CJ20S10/21MJ50 PRINTED WIRING BOARD ASSEMBLIES: 20J-S100S PWB-B:CRT Unit (Wiring Side) PWB-E:MTS Unit (Wiring Side) PWB-A:MAIN Unit (Wiring Side)
  • Page 21 20J-S100/100S 20J-S100/100S CJ20S10/21MJ50 CJ20S10/21MJ50 PWB-B:CRT Unit (Chip Parts Side) PWB-E:MTS Unit (Chip Parts Side) PWB-A:MAIN Unit (Chip Parts Side)

  • Page 22: Printed Wiring Board Assemblies

    CF302 RFiLC0404CEZZ Filter 3. NO. DE PIECE 4. DESCRIPTION VS2SC3198-Y-1 RFiLC0029TAZZ in USA: Contact your nearest SHARP Parts Distributor to or- in CANADE: Contact SHARP Electronics of Conada Limited Q753 VS2SA1013//1E 2SA1013 der. For location of SHARP Parts Distributor, Please RFiLC0007PEZZ Phone (416) 890-2100 call Toll-Free;...
  • Page 23 20J-S100/100S CJ20S10/21MJ50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9273WEV3/V6/V9 C552 VCEA0A1HW225M J C604 VCEA0A1CW227M J DUNTK9316WEV1 MAIN UNIT C608 VCFPPD3CA712H 7100p 1.6kV M-Poly. çå C202 VCKYPA1HF103Z 0.01 Ceramic (20J-S100/21MJ50/CJ20S10) C203 VCKYCY1HF103Z 0.01 Ceramic çå...
  • Page 24 20J-S100/100S CJ20S10/21MJ50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9273WEV3/V6/V9 R201 VRN-MD2AL221J 220 0.1W M-Film R202 VRD-RA2BE122J 1.2k 1/8W Carbon DUNTK9316WEV1 MAIN UNIT R203 VRD-RA2BE682J 6.8k 1/8W Carbon C2024 VCCCCY1HH101J 100p Ceramic R204 VRN-MD2AL270J 0.1W...
  • Page 25 20J-S100/100S CJ20S10/21MJ50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9273WEV3/V6/V9 R758 VRS-SV2HC180J 1/2W M-Ox. å R801 VRN-MD2AL332J 3.3k 0.1W M-Film DUNTK9316WEV1 MAIN UNIT R802 VRN-MD2AL332J 3.3k 0.1W M-Film R512 VRD-RM2HD331J 330 1/2W Carbon R803 VRN-MD2AL182J 1.8k 0.1W...
  • Page 26 20J-S100/100S CJ20S10/21MJ50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9273WEV3/V6/V9 DUNTK9274WEV3 DUNTK9316WEV1 MAIN UNIT DUNTK9274WEV3 CRT UNIT TRANSISTORS R2504 VRN-MD2AL123J 12k 0.1W M-Film R2505 VRN-MD2AL563J 56k 0.1W M-Film Q852 VS2SC2229O/1E 2SC2229 (O) R2506 VRD-RA2BE563J 56k 1/8W...
  • Page 27 20J-S100/100S CJ20S10/21MJ50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code DUNTK9274WEV3 C3014 RC-QZA473TAYK 0.047 Mylar C3015 VCSATA1CE335K Tantalum AC DUNTK9274WEV3 CRT UNIT C3016 VCE9GA1HW475M J R882 VRN-MD2AL391J 390 0.1W M-Film C3017 VCSATA1CE106K Tantalum AD R883 VRD-RA2BE561J...

  • Page 28: Cabinet Parts

    (20J-S100/100S) TiNS-6083MEZZ M Operation Manual (CJ20S10) TiNS-6087MEZZ M Operation Manual (21MJ50) PACKING PARTS SPAKC0573MEZZ M Packing Case — (20J-S100/100S/CJ20S10) SPAKC0579MEZZ M Packing Case (21MJ50) — SPAKP0023MEZZ M Polyethylene Sack — SPAKX0167MEZZ M Buffer Material — SSAKA0004MEZZ M Polyethylene Sack —...

  • Page 29: Packing Of The Set

    20J-S100/100S CJ20S10/21MJ50 Ref. No. Part No. Description Code Ref. No. Part No. Description Code PACKING OF THE SET Polystyrene Bag Operation manual Guarantee Card and batteries Polystyrene mat Buffer material FRONT Packing case Use tapes to fix the packing case.
  • Page 30 20J-S100/100S CJ20S10/21MJ50 TQ0286-S Printed in U.S.A...

This manual is also suitable for:

20j-s10020j-s100sCj20s10

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