Sharp 20MR10M Service Manual
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Sharp 20MR10M Service Manual

Sharp 20MR10M Service Manual

Chassis no. cd-a
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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.
» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1
» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
» LOCATION OF USER'S CONTROL ..................................................................................................... 4
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 5
» CHASSIS LAYOUT ............................................................................................................................ 10
» BLOCK DIAGRAM ............................................................................................................................. 11
» SCHEMATIC DIAGRAMS .................................................................................................................. 12
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 15
» REPLACEMENT PARTS LIST ........................................................................................................... 18
» PACKING OF THE SET ..................................................................................................................... 23
POWER INPUT ................................ 120 V AC 60 Hz
POWER RATING ............................................. 69 W
PICTURE SIZE ....................... 1,194cm
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

SHARP CORPORATION

SERVICE MANUAL

COLOR TELEVISION
MODELS
CONTENTS
ELECTRICAL SPECIFICATIONS
AUDIO POWER
OUTPUT RATING ........... 1.0 W (at 10% distortion)
SPEAKER
(185sq inch)
2
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
(Nominal)
Specifications are subject to change without
prior notice.
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
1
Chassis No. CD-A
20MR10M
(EIA, Channel Plan U.S.A.)
20MR10M
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  • Page 1: Table Of Contents

    20MR10M SERVICE MANUAL COLOR TELEVISION Chassis No. CD-A 20MR10M 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

    20MR10M 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 1.

  • Page 3: Safety Notice

    20MR10M IMPORTANT SERVICE SAFETY PRECAUTION (Continued) » Connect the resistor connection to all exposed metal BEFORE RETURNING THE RECEIVER parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage Before returning the receiver to the user, perform drop across the resistor.

  • Page 4: Location Of User's Control

    20MR10M LOCATION OF USER'S CONTROL...

  • Page 5: Installation And Service Instructions

    20MR10M 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. HIGH VOLTAGE CHECK CIRCUIT PROTECTION The receiver is protected by a 4.0A fuse (F701),...
  • Page 6 20MR10M 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 serv- ice adjustments are required.

  • Page 7: Service Mode

    20MR10M SERVICE MODE (1) In the Service Mode, Key is used to select the mode in the following oreder. AGC & WHITE POINT GEOMETRIC ADJ. ADJ. MODE MODE MODE FEATURE OFFSET OPTION OPTION ADJ. MODE MODE MODE AGC & WHITE POINT GEOMETRIC ADJ.
  • Page 8 20MR10M FEATURE OFFSET ADJ. OPTION MODE MODE Y-D TIME (TV) [ YD ] (DL-TV) V-CHIP (V-CHIP) Y-D TIME (AV) [ YD ] (DL-AV) DEMO MODE (DEMO) INITIAL/DEFAULT LANGUAGE (INIT) REAL TIME CLOCK / ON TIMER (CLOCK) FAO-MAX VOLUME (FAO-VOL) ENERGY SAVE (E-SAVE)
  • Page 9 20MR10M SERVICE MODE DATA SERVICE REMARK ADJUST ITEM POSITION RANGE INITIAL VALUE FIX/ADJ AGC TAKE OVER POINT 0~63 V-LIN VERTICAL SLOPE 0~63 V-AMP VERTICAL AMP 0~63 V-CENT VERTICAL SHIFT 0~63 V-ZOOM VERTICAL ZOOM 0~63 H-CENT HORIZONTAL SHIFT 0~63 H-SIZE EAST-WEST WIDTH...
  • Page 10 20MR10M DATA SERVICE REMARK ADJUST ITEM POSITION RANGE INITIAL VALUE FIX/ADJ FMWS FM WINDOW SELECTION 0(disable) or1(enable) SOUND MUTE BIT 0 (SM0) 0(disable) or1(enable) SOUND MUTE BIT 1 0(disable) or1(enable) AGC0 IF AGC SPEED BIT 0 0(disable) or1(enable) AGC1 IF AGC SPEED BIT 1...

  • Page 11: Service Adjustment

    20MR10M Ë SERVICE ADJUSTMENT VCO Adjustment White Balance Adjustment 1. Connect a digital voltmeter between pin (44) of IC201 1. Receive a good local channel. and ground. 2. Enter the service mode and select the service 2. Receive a good local channel.

  • Page 12: Schematic Diagrams

    20MR10M DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 1. Photographs taken on a standard gated color bar 1. The unit of resistance "ohm" is omitted. signal, the tint setting adjusted for proper color. The (K=k =1000 , M=M ) wave shapes at the red, green and blue cathodes of 2.
  • Page 13 20MR10M SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 14 20MR10M...
  • Page 15 20MR10M SCHEMATIC DIAGRAM: CRT Unit...

  • Page 16: Printed Wiring Board Assemblies

    2SC3207-AT Q603 VS2SC3198-G-1+ 2SC3198-G in USA: Contact your nearest SHARP Parts Distributor to order. Q751 VS2SC3198-G-1+ 2SC3198-G For location of SHARP Parts Distributor, Please call Toll- Q752 VS2SC3198-G-1+ 2SC3198-G Free; 1-800-BE-SHARP Q801 VS2SB709AR/-1Y 2SB709AR « MARK: SPARE PARTS-DELIVERY SECTION Q802...

  • Page 17: Main Unit

    20MR10M « Ref. No. Part No. « Description Code Ref. No. Part No. Description Code C533 VCQYTA1HM104J+ Mylar PWB-A: DUNTKD167WEA0 C601 VCQYTA1HM563J+ 0.056 Mylar C602 VCEA0A1HW475M+ MAIN UNIT C603 VCEA0A1HW105M+ C604 VCEA0A2EW106M+ 250V DIODES C605 VCKYPA2HB102K+ 1000p 500V Ceramic AA...
  • Page 18 20MR10M Ref. No. Part No. « Description Code Ref. No. Part No. « Description Code R607 VRD-RM2HD270JY 1/2W Carbon PWB-A: DUNTKD167WEA0 R609 VRD-RA2BE154JY 150k 1/8W Carbon R610 VRD-RA2BE102GY 1.0k 1/8W Carbon MAIN UNIT R611 VRD-RA2BE102JY 1/8W Carbon R612 VRS-CY1JF123JY 1/16W M-Ox.

  • Page 19: Miscellaneous Parts

    20MR10M « Ref. No. Part No. Description Code Ref. No. Part No. « Description Code CAPACITORS PWB-A: DUNTKD167WEA0 [EL.··· Electrolytic, M-Poly.··· Metalized Polypro Film] MAIN UNIT C871 VCCSCY1HL471JY 470p Ceramic AB C872 VCCSCY1HL471JY 470p Ceramic AB RESISTORS C873 VCCSCY1HL471JY 470p Ceramic AB [M-Ox.···...

  • Page 20: Cabinet Parts

    20MR10M Ref. No. Part No. « Description Code Ref. No. Part No. « Description Code SUPPLIED ACCESORRIES CABINET PARTS RRMCG1339CESB Infrared R-C Unit CCABA0006WEH7 CAB-A ASSY TINS-B821WJZZ operation manual 1—1 Not Available — FRONT CABINET TCAUS3000GJZZ Caution label GCOVA0003GJSA R/C COVER...

  • Page 21: Packing Of The Set

    20MR10M PACKING OF THE SET Polyethylene Bag Operation Manual Infrared R/C Unit Batteries Wrapping Paper Buffer Material FRONT Packing Case Use tape to fix the top side of packing case. REAR Use 10 staples to fix the bottom side of packing case.
  • Page 22 QRC0010-L Jan. 200 Modify : SEMEX Design and Production Information Design base : JAPAN SHARP ELECTRONICA MEXICO S. A. DE C. V. Production : SEMEX Quality & Reliability Control Center Blvd. SHARP No. 3510 Parque Industrial Rosarito Playas de Rosarito, México B. C. 22710...

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