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Summary of Contents for Akai 14CNT11BB
- Page 1 CRT COLOR TV SET 14CNT11BB 14CNT11BS 21CTU01BC...
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Page 2: Table Of Contents
CONTENTS safety precautions………………………………………………………………………………………2 block diagram…………………………………………………………………………………………….3 3． Replacement of memory IC……………………………………………………………………………4 4． Service adjustment……………………………………………………………………………………...5 5． IC’s functional description……………………………………………………………..………………7 6． Test point waveform…………………………………………………………………………..…….…9 7． IC’s voltages………………………………………………………………………......…….10... -
Page 3: Safety Precautions
1. SAFETY RECAUTIONS The design of this product contains special hardware, many 11. 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 4: Block Diagram
2 Block Diagram V1 IN TUNER V1 IN IF1 IN TDA111XX IF2 IN V2 IN TDA121XX AL1 IN RF AGC AR1 IN Y IN Y IN U IN U IN V IN V IN V OUT SELECT V OUT AL IN AL OUT AR IN AR OUT... -
Page 5: 3． Replacement Of Memory Ic
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. -
Page 6: 4． Service Adjustment
4. SERVICE ADJUSTMENT 4.1 Enter the factory menu PUSH 【 MENU 】 KEY → DISPLAY PICTURE MANUAL → PUSH DIGITAL KEY “6483” → DISPLAY “B/W BANLANCE” . PUSH 【 STANDBY 】 KEY WILL BE EXIT FACTORY MODE PRESS 【 TEST 】 KEY OR 【 POWER 】 WILL BE EXIT FACTORY MODE ... - Page 7 MENU1 PRESE DESCRIPTION TEST.S 0=external signal,1=black signal ， 2=white signal ， 3=red signal ， 4=green signal,5=blue signal R．BIA (VARIABLE 0~63) R bais adjusted G．BIA (VARIABLE 0~63) bais adjusted B．BIA (VARIABLE 0~63) bais adjusted R．DRV (VARIABLE 0~63) adjusted drive G．DRV (VARIABLE 0~63) adjusted drive B．DRV...
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Page 8: 5． Ic's Functional Description
5. IC’s functional description TDA111XX & TDA121XX Function : Main IC SYMBOL DESCRIPTION IFVO CVBS output(front-end or selected video) Supply VSP(IF and sound) --(5V) VCCAUDIO Supply VSP(only sound output stage)--(8V) PLLIF IF-PLL time-constant GND2 Ground VSP(IF and sound) DECSDEM Demodulator decoupling capacitor FMDEMOUT capacitor,second sound... - Page 9 AV2 control STANDBY Standby output 50/60HZ 50/60HZ control VDDC Supply TCG core (3.3V) GND5 Ground TCG and digital ground VSP OTP programming voltage VDDA Analog supply TCG digital supply VSP (3.3V) BOUT Blue output GOUT green output ROUT Red output BLKIN Feedback input continuous cathode calibration loop and vertical guard input...
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Page 10: 6． Test Point Waveform
STV9302A /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 Ground 6. Test point Waveforms 2.0Vpp 1.2Vpp 1.2Vpp 1.3Vpp 1.2Vpp... -
Page 11: 7． Ic's Voltages
7. IC’s voltages TDA111XX/TDA121XX 0.6 0.35 2.5 STV9302A/LA78040 15.9 -0.07 AN17821/AN17823...
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