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COLOUR TELEVISION 
 
 

 

SERVICE MANUAL 

 
 
 
 

 

 

 

                                     

Models:

 

                                            NS-F20C

 

 

 
 

 

 

 

 

 
 
 
 
 
 
 

 
 
 
 
 

 
 
 
 
 
 

Edition: 2007-3-1 

 

Summary of Contents for NS-F20C

Page 1: ...COLOUR TELEVISION SERVICE MANUAL Models NS F20C Edition 2007 3 1...

Page 2: ...CONTENTS 1 Safety precautions 3 2 TV block diagram 4 3 Replacement of memory IC 5 4 Service adjustment 5 5 ICs functional description 10 6 Test point waveform 10 7 All ICs voltages 10 2...

Page 3: ...t check high voltage by drawing an arc Use a high voltage meter or a high voltage probe with a VTVM Discharge the picture tube before attempting meter connection by connecting a clip lead to the groun...

Page 4: ...4 2 Block diagram TDA8377 PS N3 2 series with mono intercarrier sound demodulator...

Page 5: ...ata adjustment of corresponding factory menus Press EXIT key to exit factory mode Focus adjustment 1 Receive a crosshatch signal 2 While watching the screen adjust the FOCUS VR on the FBT to make the...

Page 6: ...ode drive level 31 AGC IF AGC speed VG2B VG2 Brightness IFO Off set IF demodulator 5 Picture preset 1 0CON Listen Contrast 0 A 0BRI Listen Brightness 0 A 0COL Listen Colour 50 A 0SHP Listen Sharpness...

Page 7: ...1 Enable 0 EA Bit 2 FMWS 1 Enable 0 EA Bit 1 RESERVE 1 Enable 1 EA Bit 0 AVL 1 Enable 1 EA 3 OP3 Bit Function Description Preset Remark Bit 7 TDA8377 1 Enable 1 EA Bit 6 16 9 1 Enable 0 EA Bit 5 RESER...

Page 8: ...I 2 C bus data line TUNING 4 tuning Voltage Vt PWM output KEY 5 Control keys input SYSTEM 6 TV system control VOL 7 Sound Volume control PWM output MUTE 8 Sound mute output VSSC P 9 Digit ground for...

Page 9: ...supply of TV processor 3 3 V VPE 55 Ground VDDC 56 Digital supply to core 3 3 V OSCGND 57 Oscillator ground supply XTALIN 58 Crystal oscillator input XTALOUT 59 Crystal oscillator output RESET 60 Grou...

Page 10: ...DA8377 PIN38 5Vpp 0 9Vpp CRT KB CRT KG CRT KR 95Vpp 95Vpp 95Vpp H H H 7 IC voltages TDA8377 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 V 0 3 8 3 6 3 3 3 5 4 4 5 1 1 8 0 0 18 0 17 0 2 3 8 5 3 PIN 17 18...

Page 11: ...5 1 3 3 5 TDA8357 PIN 1 2 3 4 5 6 7 8 9 V 0 8 0 7 16 6 9 0 43 7 2 0 3 7 2 AN 7522N PIN 1 2 3 4 5 6 7 8 9 10 11 12 V 10 4 4 0 4 4 2 75 1 4 0 1 4 0 35 4 4 0 4 4 24C08 PCF8598 PIN 1 2 3 4 5 6 7 8 V 0 0...

Page 12: ...screen Fig 3 8 Move the deflection yoke forward and fix the position of the deflection yoke so that the whole screen will become green 9 Insert the wedge to the top side of the deflection yoke so that...

Page 13: ...nvergence DYNAMIC CONVERGENCE ADJUSTMENT 13 1 Move the deflection yoke up and down and overlap lines in the periphery Fig 2 2 Move the deflection yoke left to right and overlap the lines in the periph...

Page 14: ...TZJ5 1B DZ102 63V 0 1 F C101 1 6W 68K R261 1N4148 VD217 1 6W 9 1K R260 1 6W 1K R227 1 6W 9 1K R262 B4 12V C214 104 SYSTEM 1W 33 R110 LGA0203 100 L102 SDA SCL 1 6W 22 R103 SPEAKER SPEAKER INPUT INPUT 2...

Page 15: ...Sincere Forever 15...

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