Sharp 20F550 Service Manual
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Sharp 20F550 Service Manual

Color television
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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
» SERVICE MODE .................................................................................................................................. 6
» ADJUSTMENT METHOD ..................................................................................................................... 7
» CHASSIS LAYOUT ............................................................................................................................. 15
» BLOCK DIAGRAM .............................................................................................................................. 16
» WAVEFORMS ..................................................................................................................................... 20
» DESCRIPTION OF SCHEMATIC DIAGRAM ...................................................................................... 21
» SCHEMATIC DIAGRAMS ................................................................................................................... 22
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 26
» REPLACEMENT PARTS LIST ............................................................................................................ 30
» PACKING OF THE SET ...................................................................................................................... 36
POWER INPUT .................................................... AC 120 V, 60 Hz
POWER RATING .................................................................... 88W
PICTURE SIZE .......................................... 1,239 cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS .................................................. QFP/UNI-B1 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 ........................................ 2.5 W(RMS) x 2pcs

SHARP CORPORATION

SERVICE MANUAL

MODEL
CONTENTS

ELECTRICAL SPECIFICATIONS

SPEAKER
SIZE ................................................................... 12 x 5 cm, 2pcs
2
(192sq inch)
VOICE COIL IMPEDANCE ............................. 16 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.
COLOR TELEVISION
Chassis No. GA-4
20F550
(EIA, Channel Plan U.S.A.)
S64T921FL94//
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  • Page 1: Table Of Contents

    S64T921FL94// COLOR TELEVISION Chassis No. GA-4 20F550 MODEL 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

    20F550 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

    20F550 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) BEFORE RETURNING THE RECEIVER • Connect the resistor connection to all exposed metal parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop Before returning the receiver to the user, perform across the resistor.

  • Page 4: Location Of User's Control

    20F550 LOCATION OF USER'S CONTROL Front Panel POWER INSIDE DOOR Press → On. Press again → Off. VIDEO/AUDIO IN 2 TERMINALS REMOTE CONTROL SENSOR CHANNEL UP/DOWN MENU ( ) Selects next higher channel Press → Accesses MAIN MENU. ( ) Selects next lower channel Press again →...

  • Page 5: Installation And Service Instructions

    20F550 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...

  • Page 6: Service Mode

    20F550 SERVICE MODE Service Mode Overview 1. Service mode is entered by SERVICE key input or CH-UP +VOL-DOWN input during reset. 2. Service mode is cleared by entering SERVICE key command during service mode. 3. If key input port (SERVICE) input is LOW, then it is in service mode.

  • Page 7: Adjustment Method

    20F550 ADJUSTMENT METHOD Caution: to get into the service mode, one of the ways is press direct key for service items. the other ways is short the main chassis JA301 and JA410 There is three stage of Service Mode data...

  • Page 8: Self Adjustment

    20F550 Ë SELF ADJUSTMENT H-VCO 1. When there is H-VCO self-adjustment key input for adjustment item H-VCO, self-adjustment is performed. 2. H-FREE(1chip) is set to 1. 3. H-OUT is set by intelligent monitor output. 4. IM input is set as TIM input.
  • Page 9 20F550 Setting Mode Items Item Name Register Range Default VIDEO TONE -GAIN (TV) 1 Chips V-TONE VIDEO TONE -GAIN (AV) 1 Chips V-TONE VIDEO TONE -GAIN (S-AV) 1 Chips V-TONE VIDEO TONE -GAIN(YUV) 1 Chips V-TONE ABCL 1 Chips ABCL...
  • Page 10 20F550 Setting Mode Items (Continued) Item Name Register Range Default FAO-VOL 0~63 CHARGE PUMP CC LEVEL MICON CC LEVEL OSD POS MICON OSD POS OFFSET-ADJ-COL 1 Chips COLOR -32~+32 OFFSET-ADJ-TINT 1 Chips TINT -32~+32 OFFSET-ADJ-TINT-YUV 1 Chips BASEBAND-TINT -32~+32 WAIT MD TIMER...
  • Page 11 20F550 Option Mode Items OPTION FUNCTION Default Data DEMO Without DEMO With DEMO DOWNLOAD Without V-CHIP OP With V-CHIP OP V-CHIP Without V-CHIP With V-CHIP SPEAKER Without SPEAKER With SPEAKER Without FAO With FAO P.PREF Without P.REF With P.REF UNIV+...
  • Page 12 20F550 Adjustment Mode Items Item Name Register Range Default SUB-PICTURE 1 Chip CONTRAST 0~127 SUB-TINT 1 Chip TINT 0~127 SUB-COLOR 1 Chip COLOR 0~127 SUB-BRIGHT 1 Chip BRIGHT 0~255 SUB-SHARP 1 Chip VIDEO-TONE 0~63 V-SHIFT 1 Chip V-SHIFT H-SHIFT 1 Chip...
  • Page 13 20F550 Second Stage Data Service Mode Function Range Default Data VIDEO TONE -GAIN (TV) V-TONE VIDEO TONE -GAIN (AV) V-TONE VIDEO TONE -GAIN (S-AV) V-TONE VIDEO TONE -GAIN(YUV) V-TONE ABCL ABCL BS-OFF ABCL-G ABCL-G SHP-AV VIDEO-TONE(OFFSET) -16~+16 SHP-SAV VIDEO-TONE(OFFSET) -16~+16...
  • Page 14 20F550 Second Stage (Continued) Data Service Mode Function Range Default Data CHARGE PUMP CC LEVEL CC LEVEL OSD POS OSD POS OFFSET-ADJ-COL COLOR -32~+32 OFFSET-ADJ-TINT TINT -32~+32 OFFSET-ADJ-TINT-YUV BASEBAND-TINT -32~+32 WAIT MD TIMER SLOW MODE R-CUT-YUV R-CUT(OFFSET) -63~+63 G-CUT-YUV G-CUT(OFFSET)

  • Page 15: Chassis Layout

    20F550 CHASSIS LAYOUT...

  • Page 16: Block Diagram

    20F550 CRT BLOCK DIAGRAM...

  • Page 17: Main Block Diagram

    20F550 MAIN BLOCK DIAGRAM...
  • Page 18 20F550...
  • Page 19 20F550 MTS BLOCK DIAGRAM...

  • Page 20: Waveforms

    20F550 WAVEFORMS...

  • Page 21: Description Of Schematic Diagram

    20F550 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 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 Ω =1000 Ω , M=M Ω ) wave shapes at the red, green and blue cathodes of 2.

  • Page 22: Schematic Diagrams

    20F550 SCHEMATIC DIAGRAM: CRT Unit...
  • Page 23 20F550 SCHEMATIC DIAGRAM: MAIN Unit...
  • Page 24 20F550...
  • Page 25 20F550 SCHEMATIC DIAGRAM: MTS Unit...

  • Page 26: Printed Wiring Board Assemblies

    20F550 PRINTED WIRING BOARD ASSEMBLIES PWB-B: CRT Unit (Wiring Side)
  • Page 27 20F550 PWB-A: MAIN Unit (Wiring Side)
  • Page 28 20F550 R1 0 2 7 RJ 1 6 R1 0 2 4 C1 0 1 6 R3 8 3 R1 0 0 3 R1 0 0 2 R1 0 0 7 F DC1 R1 0 8 3 Q1 0 7 2...
  • Page 29 20F550 PWB-C: MTS Unit (Wiring Side) R3 0 0 4 R3 0 0 3 C3 0 0 2 Q3 0 0 4 R3 0 0 5 R3 0 3 5 Q3 0 0 1 R3 0 2 9 R3 0 3 4...

  • Page 30: Replacement Parts List

    IC1003 VHIBR24L16F-1Y BR24L16F TRANSISTORS in USA: Contact your nearest SHARP Parts Distributor to order. Q201 VS2SC2735//1EY 2SC2735 For location of SHARP Parts Distributor, Please call Toll- Q601 VS2SC2235Y/1E+ 2SC2235-Y Free; 1-800-BE-SHARP Q602 VSTT2140+++-F TT2140LS « MARK: SPARE PARTS-DELIVERY SECTION Q603...

  • Page 31: Main Unit

    20F550 « Description « Description Ref. No. Part No. Code Ref. No. Part No. Code C393 VCEA0A1EW108M+ 1000 PWB-A: DUNTKD070WEA0 C434 VCE9GA1CW106M+ C435 VCE9GA1CW106M+ MAIN UNIT C436 VCKYCY1EF104ZY Ceramic AA C437 VCE9GA1HW106M+ DIODES C438 VCEA0A1CW106M+ D811 RH-EX0263TAZZY X EX0263TA C439 VCKYCY1HF103ZY 0.01...
  • Page 32 20F550 « Description « Description Ref. No. Part No. Code Ref. No. Part No. Code R201 VRS-CY1JF101JY 1/16W M-Ox. PWB-A: DUNTKD070WEA0 R202 VRS-CY1JF101JY 1/16W M-Ox. R205 VRS-CY1JF680JY 1/16W M-Ox. MAIN UNIT R206 VRS-CY1JF122JY 1.2k 1/16W M-Ox. R207 VRS-CY1JF221JY 1/16W M-Ox.
  • Page 33 20F550 « Description « Description Ref. No. Part No. Code Ref. No. Part No. Code R1023 VRD-RA2BE271JY 1/8W Carbon AA PWB-A: DUNTKD070WEA0 R1024 VRS-CY1JF101JY 1/16W M-Ox. R1027 VRS-CY1JF104JY 100k 1/16W M-Ox. MAIN UNIT R1031 VRD-RA2BE101JY 1/8W Carbon AA R1032 VRS-CY1JF103JY 1/16W M-Ox.

  • Page 34: Crt Unit

    20F550 « Description « Description Ref. No. Part No. Code Ref. No. Part No. Code PWB-A: DUNTKD070WEA0 PWB-C: DUNTKC574WEA2 MAIN UNIT MTS UNIT MISCELLANEOUS PARTS INTEGRATED CIRCUITS IC3001 VHICXA2194Q-1Y CXA2194Q J404 QJAKE0184CEZZ Jack,3Pin TRANSISTORS J405 QJAKG0093CEZZ Rear A/V Terminal Jack AF...

  • Page 35: Cabinet Parts

    20F550 « Description « Description Ref. No. Part No. Code Ref. No. Part No. Code PWB-C: DUNTKC574WEA2 CABINET PARTS MTS UNIT RESISTORS CCABAA323WEJ4 CAB-A ASSY [M-Ox.··· Metal Oxide, M-Film ··· Metal Film] Not Available — Front Cabinet R3013 VRS-CY1JF102JY 1/16W M-Ox.

  • Page 36: Packing Of The Set

    20F550 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 37 QRC0025-U Jan. 2005 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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