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Casio SY-20B Service Manual

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(without price)
SY-20B
(KX-529B)
MAY. 2000
SY-20B
INDEX
R

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Summary of Contents for Casio SY-20B

  • Page 1 (without price) SY-20B (KX-529B) MAY. 2000 SY-20B INDEX...
  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ..................1 BLOCK DIAGRAM ..................2 ADJUSTMENT ....................3 PRINT CIRCUIT BOARDS ................8 EXPLODED VIEW ..................10 PARTS LIST ....................11 SCHEMATIC DIAGRAMS ................13 DRIP-PROOF PERFORMANCE Q & A ............15...
  • Page 3: Specifications

    SPECIFICATIONS Item Specification 1. Type LCD Color Television 2. Reception Frequencies: UHF: UHF band CH 14 – CH 69 VHF: VHF band CH 2 – CH 13 3. Display Element: High resolution color liquid crystal display (Super Twisted Nematic Type) 4.
  • Page 4: Block Diagram

    BLOCK DIAGRAM L-PCB LAMP EXTERNAL ANT TUNER BL-PCB VIF/SIF JACK (TNS-010US) FILTER (M51348FP) Vcc2 (4V) INVERTER Vcc1-1,GND TRANS BATTERY 1.5V x 4 DC/DC POWER SW Vcc2 (4.0V) CONVERTER BAND SW Vcc1-1 Vcc7 (40V) AC ADAPTOR 6V TRANS VEE1 (-5V) Vcc2 Vcc7 Vcc7 VEE1 Vcc2-0,GND...
  • Page 5: Adjustment

    ADJUSTMENT 1. Vcc2 adjustment, Vcc7, Vee1 voltage check 2. LLD coil adjustment 3. Free running frequency adjustment 4. Contrast adjustment 5. TINT adjustment Preparations 1. Connect AVB (CP725) to GND. 2. Set SW100 on UHF mode. Adjustment And Test Point Locations T 200 VR 300 VR 301...
  • Page 6 Adjustment procedures 1. Vcc2 adjustment, Vcc7, VEE1 voltage check • Condition (1) Signal No signal (2) Other conditions Power supply: Vcc1-1 (CP101) = 5.00 ± 0.05 [V] • Adjustment Apply 5.00 ± 0.05 [V] on Vcc1-1 (CP101). Adjust VR100 so that Vcc2 (CP102) voltage becomes 4.00 ± 0.02 [V]. •...
  • Page 7 3. Free running frequency adjustment • Conditions (1) Signal No signal (NTSC standard signal should be applied only at synchronous check) (2) Signal level Input electric field only at synchronous check: 70 ± 3 dBµ (terminated with 75Ω resistance), P/S = 10 dB (3) Other conditions US IF input only at synchronous check (input electric field with 75 Ω...
  • Page 8 4. Contrast adjustment • Conditions (1) Signals Broadcasting system: M/M Color system: NTSC color bar (white 75%) (2) Signal level Input electric field: 70 ± 3 dBµ (terminated with 75Ω resistance), P/S = 10 dB (3) Others US IF input (input electric field should be terminated with 75Ω resistance) Power supply : Vcc1-1 (CP101) = 5.00 ±...
  • Page 9 5. TINT adjustment • Condition (1) Signal Broadcasting system: M/M Color system: NTSC color bar (white 75%) (2) Signal level Input electric field: 70 ± 3 dBµ (75Ω termination), P/S = 10 dB (3) Other conditions US IF input (input electric field should be terminated with 75Ω resistance). Power suppiy : Vcc1-1 (CP101) = 5.00 ±...
  • Page 10: Print Circuit Boards

    PRINTED CIRCUIT BOARDS TOP VIEWS Linear Connector — 8 —...
  • Page 11 BOTTOM VIEWS Linear Connector — 9 —...
  • Page 12: Exploded View

    EXPLODED VIEW TV UNIT — 10 —...
  • Page 13: Parts List

    PARTS PRICE LIST SY-20B Item Code No. Parts Name Specification Price Code 1002 6667 PANEL/DISPLAY K342241-1 1002 2739 TAPE/DOUBLE SIDE K442084-1 1002 3112 PANEL/UPPER K140705-3 1001 8269 SCREW BT3 1.7X5.5Ni 1001 4846 KNOB/VOLUME K341905-1 1001 4845 KNOB/BRIGHT K341906-1 1001 4839...
  • Page 14 Item Code No. Parts Name Specification Price Code 6609 1290 SCREW K412031-1 1002 2747 LABEL/CAUTIONS K442211-2 6001 0862 SPRING/BATTERY P408-1 6001 0871 SPRING/BATTERY P409-1 1002 2740 DETECTION SEAL/WET K442210-1 1001 4841 PACKING/BATTERY COVER K241358-1 1001 4844 COVER/BATTERY K241351-2 1002 5291 CASE/SHIELD K241342-1 L-PCB...
  • Page 15: Schematic Diagrams

    SCHEMATIC DIAGRAMS LINEAR IF Detection Circuit A/V Jack Audio Amplifier Circuit Earphone Jack Antenna External Antenna Jack Speaker Chroma Circuit Tunner Tuning Voltage Generator Circuit AC Jack Power Switch 36.0 ~ 44.0 V 4.00 ± 0.02 V -4.50 ~ -6.00 V Display Generator Voltage Circuit Power Supply Circuit Display Controller Circuit...
  • Page 16 BACK LIGHT SWITCH CONNECTER — 14 —...
  • Page 17: Drip-Proof Performance Q & A

    DRIP-PROOF PERFORMANCE Q & A cause1. Can the TV be washed with water? action1. This TV cannot be washed by applying cold water, hot water, sea water or any other form of moisture. This naturally is also true for soaps, detergents and other cleaners. cause2.
  • Page 18 TV while there is water present inside can result in the risk of fire or electrical shock, do not attempt to use the TV and take it to the store where it was purchased or a Casio Techno Service Station.
  • Page 19 CASIO TECHNO CO.,LTD. Overseas Service Division Nishi-Shinjuku Kimuraya Bldg. 1F 5-25, Nishi-Shinjuku 7-Chome Shinjuku-ku, Tokyo 160-0023, Japan...

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Kx-529b