Akai 21CTF66BC Service Manual
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Akai 21CTF66BC, CONTENTS 1. safety precautions………………………………………………………………………………………2 2. block diagram…………………………………………………………………………………………….3 3. Replacement of memory IC……………………………………………………………………………4 4. Service adjustment……………………………………………………………………………………...5 5.
Akai 21CTF66BC, . 1. SAFETY RECAUTIONS 2. The design of this product contains special hardware, many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only. 3. Alterations of the design or circuitry of the products should not be made. Any design alterations or additions will void the manufacturer’s warranty and will further relieve the man
Akai 21CTF66BC, 2 Block Diagram TUNER SAW EEPROM TDA111XX LA78040 E/W H. DRIVE VIDEO AMP CRT SOUND AMP 4052 POWER UNIT V. DRIVE IF1 IN IF2 IN RF AGC SDA SCL V OUT H OUT RGB OUT AUDIO OUT C IN S-VIDEO SPEAKER L SPEAKER R V1 IN EHT DEFLECT +B +27V +12V +8V +5V +3.3V +13V -13V (OPTION) AN17821 TDA121XX V1 IN AL1 IN AR1 IN Y IN U IN V IN V OUT AL OUT AR OUT V2 IN AL2 IN AR2 IN LSL OUT LSR OUT SELECT V OUT V IN U IN Y IN V2 IN AL IN AR IN 3
Akai 21CTF66BC, 4 3. 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. PROCEDURE FOR REPLACING MEMORY IC (1) Power off Switch the power off and unplug the power cord from AC outlet. (2) Replace IC Be sure to use memory IC written with the initial data values. (3) Power On Plug the power cord into the AC outlet and switch the power On.
5 4. SERVICE ADJUSTMENT 4.1 Enter the factory menu ¾ PUSH 【 MENU 】 KEY → DISPLAY PICTURE MANUAL → PUSH DIGITAL KEY “6483” → DISPLAY “B/W BANLANCE” . PUSH 【 STANDBY 】 KEY WILL BE EXIT FACTORY MODE ¾ PRESS 【 TEST 】 KEY OR 【 POWER 】 WILL BE EXIT FACTORY MODE ¾ IN 【 TEST 】 MODE .PRESS 【 -/-- 】 KEY WILL BE ENTER 【 BUS
z Adjust V.size value to get 90% of vertical picture contents would be displayed on CRT z Adjust VSC value to vertical S-correction is ok z Adjust H.PHASE value to get the picture horizontal center correspond to CRT horizontal center MENU1 M1 PRESET DESCRIPTION TEST.S 0 0=external signal,1=bla
Akai 21CTF66BC, 7 z WHEN THE WHITE BANLENCE IS OK,AJUST G2 VOLTAGE TO THE SCREEN JUST DISPLAY THE LINE z PRESS V+ KEY WILL BE EXIT THE SC LINE MODE MENU2 M2 PRESET DESCRIPTION RF.AGC 29 RF AGC (VARIABLE 063) OSD.V.POS 21 16 Vertical position of OSD(0~63) OSD.H.POS 43 18 Horizital position of OSD(0~15) OSD BRT 15 Adjust brightness of OSD SHIPPING Shipping mode SETUP SELECT 0 The item setup to 1 and press mute key will be enter next menu z Receive 60dBu (1mv)V H color bar signal , adjust AGC value ( voltage from high to low ) to picture noise reduce gradually to be ju
Akai 21CTF66BC, 8 VSC 11 Vertical sawtooth capacitor IF IN2 12 Video SAW filter input 2 IF IN1 13 Video SAW filter input 2 VDRA 14 Vertical drive output A VDRB 15 Vertical drive output B AVL/EW 16 Capacitor for automatic volume leveling or E/W drive output DECBG 17 Bandgap decoupling SECPLL 18 SECAM-PLL oscillator GND1 19 Ground VSP(chroma processing and sync and geometry) PH1LF 20 Acquisition PLL first phase loop PH2LF 21 Second phase loop components VP1 22 Supply VSP (5V) DECDIG 23 Digital decoupling. XTALOUT 24 24.576MHZ crystal output XTALIN 25 24.576MHZ crystal input IR 26 IR receiver MUTE 27 MUTE output S-IN
Akai 21CTF66BC, 9 BOUT 44 Blue output GOUT 45 green output ROUT 46 Red output BLKIN 47 Feedback input continuous cathode calibration loop and vertical guard input BCLIN 48 Average beamcurrent limiter input PB 49 Pb input Y3/CVBS3 50 Y CVBS or Y(C)input PR/C3 51 Cr input YOUT 52 Y output YSYNC 53 Input sync separator VP3 54 Supply VSP(5V) GND3 55 Ground VSP HOUT 56 Horizontal deflection line drive output FBISO 57 Flyback in and sandcastle out LSR 58 Audio output (loudspeaker right) LSL 59 Audio output (loudspeaker left) C2/C3/C4/AIN5R 60 Chroma
VCC1 2 Power VCC2 6 Output power supply PUMP UP 3 Pump up power NON INV IN 7 Negative feedback GND 4 Ground 6. Test point Waveforms 10 TDA111XX PIN44 1.2Vpp 1.2Vpp 1.2Vpp H H H TDA111XX PIN45 TDA111XX PIN46 1.3Vpp TDA111XX PIN24 2.0Vpp H
Akai 21CTF66BC, 11 7. IC’s voltages TDA111XX/TDA121XX PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 V 1.5 5 8 2.0 0 2.2 2.6 2.2 1.3 2.0 2.4 1.9 1.9 0.7 0.7 0.4 PIN 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 V 2.3 2.3 0 2.3 1.8 5 2.6 1.8 1.8 5 0 0 3.3 0 0 - PIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 V 3.3 3.8 3.6 0 0 3.3 0 3.3 0 0 3.3 2.2 2.2 2.2 0 2.6 PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 V 0.5 1.4 1.6 1.6 1.9 5 0 0.6 0.35 2.5 2.5 0.6 2.2 1.4 2.2 1.4 STV9302A/LA78040 PIN 1 2 3 4 5 6 7 V 0.7 15 -12 -15 0.3 15.9 -0.07 AN17821/AN17823 PIN 1 2 3 4 5 6 7 8 9 10 11 12 V 12 7 0 7 3.3 1.4 0 1.4 0 7 0 7
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