Akai 21CTU94BC Service Manual
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Akai 21CTU94BC Service Manual

Crt color tv set
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CRT COLOR TV SET
21CTU94BC

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Summary of Contents for Akai 21CTU94BC

  • Page 1 CRT COLOR TV SET 21CTU94BC...
  • Page 2 SERVICE MANUAL AKAI 21CTU94BC This manual is the latest at the time of printing, and does not include the modification which may be made after the printing, by the constant improvement of product...

  • Page 3: Table Of Contents

    - Content ......................... 2 - Bill of Materials ......................3 - Safety Precautions ....................... 7 - TV Block Diagram ......................8 - Replacement Of Memory IC ..................10 - Service Adjustment ...................... 10 - ICs Functional Description ..................18 - Test point Waveforms ....................22 - Purity / Convergence Adjustment ................

  • Page 4: Bill Of Materials

    PCB NO. DESCRIPTION CABLE & SOCKET AV6-14 XS801 CH5B-2.5-2DY XS601 XS602 XS702 CH5B-2.5-4DY XS403 XS703 XS704 XS804 CH5B-2.5-5DY XS201 CH7-10-1DY CH7-10-2DY XS501 XS502 CH7-8-10-4DY XS402 CH9-2.5-2DY-500-CH5B XS701 CH9-2.5-4DY-400-CH5B XS705 CH9-2.5-4DY-450-CH5B PA102 CH9-2.5-4DY-450-CH5B XP902 CH9-2.5-5DY-500-CH5B XP901 RCA-106A (red) RCA-106A (white) RCA-106A (yellow) CARBON RESISTOR RT-1/2W-1KΩ-J R403...
  • Page 5 QTY PCB NO. DESCRIPTION CT-63V-1000pF-J C202 C203 C205 C206 C213 C214 CT-63V-220pF-J C313 C702 C703 CT-63V-390pF-J C921 C931 C911 CT-63V-560pF-J C225 CT7-2E4-400VAC-2200pF-M C515 C516 COIL, IN,LF,TFM 130-208-0011 L405 3.0mH L404 F22-22P0-031000/JLF-148-ET24 L501 L502 JBC-184-EI19/YDD-EI19 T451 JLC/YDD-600µH L311 JLC-128-30µH L441 LG0307-1.2UH-K L101 LG0307-10UH-K L202...
  • Page 6 QTY PCB NO. DESCRIPTION W101 W102 W103 W201 W202 W203 W206 W207 W208 W209 W210 W211 W212 W403 W503 W506 W512 W513 W552 W563 7.5MM W601 W603 W604 W605 W606 W607 W708 W710 W713 W751 D557 R319 7.5MM AW101 7.5MM D911 D921 D931...
  • Page 7 QTY PCB NO. DESCRIPTION A940 V303 BF421/BF423 V913 V923 V933 TUNER EWE-5053-V8/ET-5K1E-EV100K A101 VARIABLE RESISTOR W206-2AL20KΩ-K RP551 ZENER DIODE MTZJ3V3/3C2 D703 MTZJ3V6/4A2 D509 MTZJ5V1/5C2 D801 D802 MTZJ5V6/6B1 D567 D564 MTZJ8V2 D941 MTZJ8V2/9A2 D402 MTZJ8V7/9B2 D561...

  • Page 8: Safety Precautions

    SAFETY PRECAUTIONS The design of this product contains special hardware, many 10. Isolation Check circuits and components specially for safety purposes. For (Safety for Electrical Shock Hazard) continued protection, no changes should be made to the After re-assembling the product, always perform an isolation original design unless authorized in writing by the check on the exposed metal parts of the cabinet (antenna manufacturer.

  • Page 9: Tv Block Diagram

    TV Block diagram TDA11105-XXXX video IF IN R IN TUNER RF AGC B IN video video CHROMA AR i1 4052 VIDEO CVBS/Y IN ALi 1 Video IN CVBS1 IN 24C08 CVBS2 IN ARi 2 MA IN L ALi 2 MAOUTR MA IN R MAOUTL RGB OUT...

  • Page 11: Replacement Of Memory Ic

    REPLACEMENT OF MEMORY IC 1. MEMORY IC. This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and deflection circuits. When replacing memory IC, be sure to use IC written with the initial value of data. 2.
  • Page 12 production doesn't need to carry on M 3~ adjustments of M9. In "M0"~under"M9" appearance press” CALL” the key can get into "M" appearance. At “M”under the appearance press “-/-“ the key can get into “BUS OPEN” appearance, at “BUS OPEN under, press “-/-“...
  • Page 13 C standard UOC for export bus control adjustment item default setting 2007-12-05 Items Variable Preset recommendation 50HZ 60HZ 50HZ 60HZ V. LOPE +/-32 Picture vertical center adjustment V. SIZE +/-32 Vertical amplitude adjustment V. SC +/-32 Vertical S Correction Adjustment V.LINE +/-32 Vertical positions adjustment...
  • Page 14 0~63 Cut-off control range 0:normal control range 1:extended control range CHINESE ON/OFF OSD language selection THAI ON/OFF OSD language selection VIETNAM ON/OFF OSD language selection INDONESIA ON/OFF OSD language selection ARABIC ON/OFF OSD language selection Vercital amplitude System I output signal amplitude correction 0:no correction 1:amplitude + 12% Control sequence of beam current limiting 0:normal operation(contrast—brightness)
  • Page 15 DCXO Crystal load electric capacity compensate Forced slicing level for vertical sync Slicing level for horizontal sync separator 0:50% 1:30%,direction top sync Group delay on CVBSI signal 0:no group delay correction 1: group delay correction switched on Sync hronization of OSD/TEXT display ON/OFF Black current stabilization Disable flash protection from deflection timer...
  • Page 16 DSGLS Extra gain selection loudspeaker outputs 0:+0 Db 1:+6 Db No red reduction during blue stretch AMLOW Audio output signal for AM sound GSSIF Extra gain-range SSIF for AM demodulation V.P1 0~100 V.P1 volume of VALUE V.P25 0~100 V.P25 volume of VALUE V.P50 0~100 V.P50 volume of VALUE...
  • Page 17 M.COLOR 0~100 mild Color in pp mode M.SHARP 0~100 mildSharpness in pp mode W.BRT 0~100 factory adjusts Brightness W.CONT 0~100 factory adjusts Contrast W.COLOR 0~100 factory adjusts Color SC BRT 0~100 Subsidiary Bright Adjustment COOL 0~63 Cool color adjustment WARM 0~63 Warm color adjustment ON/OFF...
  • Page 18 4 , LOGO EDIT This software LOGO is a pair of pleased words and customer to edit 2 kinds, at the M_MODE, long press[P.P]the key can get into a pair of pleased words editor appearance. ( Operate Press[1]/[2] keys: The LOGO perpendicular position adjust, [1] adjusts upward, [2] get down adjustment;...

  • Page 19: Ics Functional Description

    ICs functional description UOC TDA11105-XXXX/TDA11106-XXXX SYMBOL DESCRIPTION IF VO IF video output / selected CVBS output Supply voltage TV processor(+5v) VCC AUDIO 8 volt supply for audio switches(+5V~8V) PLL IF IF-PLL loop filter GND2 Gaound 2 for TV processor DECSDEM decoupling sound demodulator or SIF input 2 FMDEMOUT audio output /AM audio output (volume controlled)
  • Page 20 VDDC Supply(3.3V) GND5 Ground 5 OPT programming Voltage VDDA Supply voltage(3.3V) BOUT Blue output GOUT Green output ROUT Red output BLKIN black current input / V-guard input BCL IN beam current limiter input B input / U (B-Y) input / P input Y3/CVBS3 G input / Y input...
  • Page 21 BLOCK AND APPLICATION DIAGRAM TDA7266SA V CC 470µF 100nF 0.22µF OUT1+ S-GND OUT1- Vref 0.22µF OUT2+ OUT2- PW-GND D94AU175B ABSOLUTE MAXIMUM RATINGS y l l Total Power Dissipation (T ° 0 ° ° stg, THERMAL DATA ° th j-case ° th j-amb ELECTRICAL CHARACTERISTCS = 11V, R...
  • Page 22 Ω Mute Threshold for V > 6.4V; Vo = -30dB MUTE for V < 6.4V; Vo = -30dB -075 -0.5 ST-BY µA ST-BY Total Output Voltage A Curve; f = 20Hzto 20KHz µV Distortion vs Frequenc Gain vs Frequency Le vel(dB r) THD(%) 5.0000 4.0000...

  • Page 23: Test Point Waveforms

    LA9302A/8177/LA78041/LA78040 Function : vertical output Symbol Function Symbol Function INV IN Input V OUT Vertical output VCC1 Power VCC2 Output power supply PUMP UP Pump up power NON INV IN Negative feedback Test point Waveforms 1.2Vpp 2.6Vpp 3.8Vpp 2.5Vpp 2.5Vpp TDA11105 PIN45 TDA11105 PIN44 TDA11105 PIN46...

  • Page 24: Purity / Convergence Adjustment

    PURITY / CONVERGENCE ADJUSTMENT PURITY ADJUSTMENT WEDGE Demagnetize CRT with the demagnetizer. DEFLECTION YOKE Loosen the retainer screw of the deflection yoke. Remove the wedges. Input a green raster signal from the signal generator, and turn the screen to green raster. Move the deflection yoke backward.
  • Page 25 STATIC CONVERGENCE ADJUSTMENT 1. Input a crosshatch signal. 2. Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig. 1) and turn them to magenta (red/blue). (FRONT VIEW) 3. Using 6-pole convergence magnets, overlap the magenta (red/blue) and green lines in the center of the screen and turn them to white.

  • Page 26: Explore View Diagram

    21CTU94BC...

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