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Sharp 27SC26B Service Manual

Chassis no. gb-3d(1w)
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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 ADJUSTMENT ..................................................................................................................... 9
» CHASSIS LAYOUT ............................................................................................................................. 12
» BLOCK DIAGRAM .............................................................................................................................. 13
» DESCRIPTION OF SCHEMATIC DIAGRAMS & WAVEFORMS ........................................................14
» SCHEMATIC DIAGRAMS ................................................................................................................... 15
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 22
» PARTS LIST ........................................................................................................................................ 27
» PACKING OF THE SET ...................................................................................................................... 36
POWER INPUT ..................................................... 120V AC, 60 Hz
POWER RATING ................................................................... 130W
PICTURE SIZE .......................................... 2,187 cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ...... 45.75 MHz (Analog Terrestrial)
Sound IF Carrier Frequency....... 41.25 MHz (Analog Terrestrial)
Color Sub-Carrier Frequency ..... 42.17 MHz (Analog Terrestrial)
IF Center Frequency ........................ 44 MHz (Digital Terrestrial)
AUDIO POWER
OUTPUT RATING .............. 3.0W + 3.0W (at 10% distortion and
SHARP CORPORATION
SERVICE MANUAL
MODEL
CONTENTS

ELECTRICAL SPECIFICATIONS

SPEAKER
SIZE .......................................................... 9 x 5 cm oval (2 pcs.)
2
(339sq 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
Digital Terrestrial Broadcast (VHF/UHF) .......................2 thru 69
(Nominal)
Specifications are subject to change without
Dual CH Operate)
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. GB-3D(1W)
27SC26B
(EIA, Channel Plan U.S.A.)
27SC26B
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Summary of Contents for Sharp 27SC26B

  • Page 1: Table Of Contents

    27SC26B SERVICE MANUAL COLOR TELEVISION Chassis No. GB-3D(1W) 27SC26B 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

    27SC26B 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 27SC26B 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

    27SC26B LOCATION OF USER'S CONTROL Front Panel POWER VIDEO/AUDIO IN 2 Press TERMINALS Press again Off. REMOTE CONTROL SENSOR CHANNEL UP/DOWN MENU ( ) Selects next higher channel. Press Accesses MAIN MENU. VOLUME UP/DOWN ( ) Selects next lower channel.

  • Page 5: Installation And Service Instructions

    27SC26B 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 27SC26B 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 TINT-S 0-127 (00h-7Fh) 62 (3Eh) S-Terminal Input C-TRAP 0-1 (00h-01h) 00 (00h) AUTO FRESH 0-1 (00h-01h) 00 (00h) SHARP P F 0-1 (00h-01h) 01 (01h) CD MATRIX 0-3 (00h-03h) 02 (02h) B-Y ATT 0-1 (00h-01h) 00 (00h) R-Y ATT 0-1 (00h-01h)
  • Page 8 27SC26B DATA SERVICE NOTES FIXED VALUE ADJUSTMENT ITEM NUMBER RANGE (HEX) INITIAL VALUE V POSITION 0-7 (00h-07h) 00 (00h) H POSITION 0-31 (00h-1Fh) 15 (0Fh) V SIZE 0-127 (00h-7Fh) 89 (59h) H SIZE 0-63 (00h-3Fh) 36 (24h) V-LINEARITY 0-15 (00h-0Fh)

  • Page 9: Service Adjustment

    27SC26B Holding down both the VOL-up and CH-up buttons on the TV set at service mode for more than 2 seconds will automatically write the above initial values into IC2101. ADJUSTMENT PART REPLACED NOTES NECESSARY UNNECESSARY IC2001 Data is stored in IC2101.
  • Page 10 27SC26B Sub-Tint Adjustment 2. Enter the service mode and select the service adjustment "D03" for V-size. 1. Receive the half color bar signal. 3. Adjust the "D03" bus data to get the proper V-size. • RF INPUT (TU1101) 4. For V-linearity adjustment, select data bus "D05" and 2.
  • Page 11 27SC26B Ë MTS ADJUSTMENT MTS Level Adjustment 1. Set the sound volume above 1. Monoral signal: 400Hz, 100% modulation 2. Confirm "EX4" data is "5Ah". 3. Vary the "M01" bus data until the voltage to pin (39) of IC3001 to become the value as stated below.

  • Page 12: Chassis Layout

    27SC26B CHASSIS LAYOUT...

  • Page 13: Block Diagram

    27SC26B BLOCK DIAGRAM...

  • Page 14: Description Of Schematic Diagrams & Waveforms

    27SC26B DESCRIPTION OF SCHEMATIC DIAGRAMS 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=kW=1000W, M=MW) wave shapes at the red, green and blue cathodes of 2.

  • Page 15: Schematic Diagrams

    27SC26B SCHEMATIC DIAGRAM: CRT Unit...
  • Page 16 27SC26B SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 17 27SC26B...
  • Page 18 27SC26B SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 19 27SC26B...
  • Page 20 27SC26B SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 21 27SC26B...

  • Page 22: Printed Wiring Board Assemblies

    27SC26B PRINTED WIRING BOARD ASSEMBLIES PWB-A: MAIN Unit (Wiring Components Side)
  • Page 23 27SC26B...
  • Page 24 27SC26B PWB-A: MAIN Unit (Components side)
  • Page 25 27SC26B...
  • Page 26 27SC26B PWB-B: CRT Unit (Wiring Side) PWB-D: 2-LINE Y/C Unit (Wiring Side) PWB-D: 2-LINE Y/C Unit (Chip Parts Side)

  • Page 27: Parts List

    VHINJ2584AM-1Y X NJ2584AM in USA: Contact your nearest SHARP Parts Distributor to order. IC1104 VHIBA00BC0W-1S X BA00BC0WT-V5 For location of SHARP Parts Distributor, Please call Toll- IC1403 VHIPQ05RDA1-1 X PQ050RDA1SZ Free; 1-800-BE-SHARP IC2001 RH-IXB644WJQ1Q X I.C. « MARK: SPARE PARTS-DELIVERY SECTION...
  • Page 28 27SC26B Ref. No. Part No. Description Code Ref. No. Part No. Description Code FILTERS AND COILS PWB-A: DUNTKD571WEA6 CF302 RFILC0449CEZZ+ Filter MAIN UNIT CF401 RFILC0446CEZZ+ Filter CF2040 RCRM-0003CEZZ+ Ceramic Vibrator L201 VP-XF1R2K0000Y Peaking,1.2mH DIODES L203 VP-XF100K0000Y Peaking,10mH D454 RH-EX0628GEZZY X Zener Diode 8.2V...
  • Page 29 27SC26B Ref. No. Part No. Description Code Ref. No. Part No. Description Code C744 VCKYPA2HB471K+ 470p 500V Ceramic PWB-A: DUNTKD571WEA6 C745 VCKYPA2HB102K+ 1000p 500V Ceramic MAIN UNIT C746 VCKYPA2HB102K+ 1000p 500V Ceramic C747 VCEA0A1HW475M+ C750 VCKYCY1HF103ZY 0.01 Ceramic CAPACITORS C753...
  • Page 30 27SC26B Ref. No. Part No. Description Code Ref. No. Part No. Description Code RESISTORS PWB-A: DUNTKD571WEA6 [M-Ox.··· Metal Oxide, M-Film ··· Metal Film] MAIN UNIT VRS-CY1JF000JY 1/16W M-Ox. VRS-CY1JF000JY 1/16W M-Ox. CAPACITORS RJ11 VRS-CY1JF000JY 1/16W M-Ox. [EL.··· Electrolytic, M-Poly.··· Metalized Polypro Film]...
  • Page 31 27SC26B Ref. No. Part No. Description Code Ref. No. Part No. Description Code R713 VRS-RG2HC152J+ 1.5k 1/2W M-Ox. PWB-A: DUNTKD571WEA6 R714 VRS-CY1JF332JY 3.3k 1/16W M-Ox. MAIN UNIT R715 VRN-RL2HCR56J+ 0.56 1/2W M-Film R716 VRD-RM2HD100JY X 1/2W Carbon RESISTORS R720 VRD-RA2BE473JY...
  • Page 32 27SC26B Ref. No. Part No. Description Code Ref. No. Part No. Description Code R1125 VRS-CY1JF101JY 1/16W M-Ox. PWB-A: DUNTKD571WEA6 R1126 VRS-CY1JF101JY 1/16W M-Ox. MAIN UNIT R1128 VRS-CY1JF101JY 1/16W M-Ox. R1130 VRN-RL3DB1R0J+ M-Film RESISTORS R1131 VRS-CY1JF101JY 1/16W M-Ox. [M-Ox.··· Metal Oxide, M-Film ··· Metal Film]...
  • Page 33 27SC26B Ref. No. Part No. Description Code Ref. No. Part No. Description Code P622 QPLGN0461CEZZA X plug,4pin PWB-A: DUNTKD571WEA6 P651 QPLGN0361CEZZA X plug,3pin MAIN UNIT P702 QPLGN0269GEZZ plug 2pin P703 QPLGN0260CEZZ plug 2pin P721 QPLGN0461CEZZA X plug,4pin RESISTORS P722 QPLGN0461CEZZA X plug,4pin [M-Ox.···...
  • Page 34 27SC26B Ref. No. Part No. Description Code Ref. No. Part No. Description Code C1408 VCKYCY1HB103KY 0.01 Ceramic PWB-B: DUNTKB568WEV0 C1409 VCEA0A1CW476M+ CRT UNIT C1410 VCKYCY1HB103KY 0.01 Ceramic C1411 VCKYCY1HB103KY 0.01 Ceramic RESISTORS C1412 VCKYCY1HB103KY 0.01 Ceramic C1413 VCKYCY1HB103KY 0.01 Ceramic [M-Ox.···...
  • Page 35 VW7UGB8-080KK Lead Wire (BLACK 80MM+) CABINET PARTS SUPPLIED ACCESSORIES Front Cabinet Assembly CCABAB399WEH0 Not Available — Front Cabinet — HBDGB1009MESB BADGE (SHARP PLASTIC) RRMCGA450WJSA Infrared Remote Control Unit RC/LED Cover GCOVA0112GJKA Operation Manual TINS-C430WJZZ Button, Power JBTN-0130GJKC TGAN-A216WJN1 Guarantee Card...

  • Page 36: Packing Of The Set

    27SC26B PACKING OF THE SET Polyethylene Bag ACCESSORIES Polyethylene Mat Packing Foam FRONT Packing Case Use tape to fix the top side of packing case. REAR Use 12 staples to fix the bottom side of packing case.
  • Page 37 27SC26B...
  • Page 38 QRC0029-U January. 2006 Modify : SEMEX Design and Production Information SHARP ELECTRONICA MEXICO S. A. DE C. V. Design base : SEM Quality & Reliability Control Center Production : SEMEX Blvd. SHARP No. 3510 Parque Industrial Rosarito...

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