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SERVICE MANUAL

Models:

NS-13CTV

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Summary of Contents for NS-13CTV

Page 1: ...SERVICE MANUAL Models NS 13CTV ...

Page 2: ...k diagram 4 3 Replacement of memory IC 5 4 Service adjustment 5 5 ICs functional description 8 6 Test point waveform 10 7 All ICs voltages 10 8 Purity convergence adjustment 11 9 DVD maintenance 13 10 List of Parts 14 11 Circuit diagram 28 12 Exploded view 29 2 ...

Page 3: ...Excessive high voltage can cause an increase in X Ray emission arcing and possible component damage therefore operation under excessive high voltage conditions should be kept to a minimum or should be prevented If severe arcing occurs remove the AC power immediately and determine the cause by visual inspection incorrect installation cracked or melted high voltage harness poor soldering etc To main...

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

Page 5: ...stment 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 vertical and horizontal lines as fine and sharp as possible Geometrical adjustment Receive PAL standard complete pattern signal Adjustment steps a Adjust VSL to the centre horizontal line just appears from ha...

Page 6: ...gain reduction 4 TOP AGC Take over point 27 A VOL Volume 36 9874 Gain control for TDA9874 59 AVLT 5 9860 1 IFFS Vision IF 32 HDOL Cathode drive level 31 AGC IF AGC speed VG2B VG2 Brightness PF Peaking center frequency 5 Picture preset 1 0CON Listen Contrast 0 A 0BRI Listen Brightness 0 A 0COL Listen Colour 50 A 0SHP Listen Sharpness 50 A 1CON Soft Contrast 45 A 1BRI Soft Brightness 45 A 1COL Soft ...

Page 7: ...6dBµV 0 EA Bit 6 OP_SOY 1 Enable 0 EA Bit 5 OP_ARABIC_SET 1 Enable 1 EA Bit 4 OP_FARSI_SET 1 Enable 0 EA Bit 3 OP_CYRILLIC_SET 1 Enable 1 EA Bit 2 OP_EUROUP_SET 1 Enable 1 EA Bit 1 OP_AUTO_SOUND 1 Enable 1 EA Bit 0 OP_AVL 1 Enable 1 EA 3 OP3 Bit Function Description Preset Remark Bit 7 OP_RUSSIA 1 Enable 1 EA Bit 6 OP_ITALY 1 Enable 0 EA Bit 5 OP_GERMANY 1 Enable 0 EA Bit 4 OP_FRANCE 1 Enable 0 EA...

Page 8: ...1 Enable 0 EA Bit 5 OP_PROG ID 1 Enable 0 EA Bit 4 OP_LED 1 Enable 0 EA Bit 3 OP_ TWIST 1 Enable 1 EA Bit 2 OP_BYELORUSSIAN 1 Enable 1 EA Bit 1 OP_ UKRANIAN 1 Enable 1 EA Bit 0 OP_AV1 1 Enable 1 EA 8 OP8 Bit Function Description Preset Remark Bit 7 OP_TILT 1 Enable 1 EA Bit 6 OP_DIRECT_WITCH ON 1 Enable 0 EA Bit 5 OP_INEER DVD 1 Enable 0 EA Bit 4 OP_PROG FREQ 1 Enable 0 EA Bit 3 OP_ FAST_BAR 1 Ena...

Page 9: ...ECSDEM SIFIN2 29 Decoupling sound demodulator GND2 30 Ground 2 for TV processor SNDPLL SIFAGC 1 31 Narrow band PLL filter AVL 32 Automatic Volume Levelling HOUT 33 Horizontal output FBISO 34 Flyback input sandcastle output AUDEXT 35 External audio output EHTO 36 EHT over voltage protection input PLL IF 37 IF PLL loop filter IFVO SVO 38 IF video output selected CVBS output VP1 39 supply voltage TV ...

Page 10: ... 1 output Out 2 10 Ch 2 output Standby 5 Mute input GND out 2 11 Ch 2 Ground In 1 6 Ch 1 input Out 2 12 Ch 2 output 4 N301 Vertical output TDA8357A Symbol PIN Function Symbol PIN Function INV IN 1 Input PUMP UP 6 Pump up power INV IN 2 Input V OUT 7 Vertical output Vcc 3 Pump up power V PRO 8 Vertical protection V OUT 4 Vertical output V FEEDBACK 9 Vertical feedback GND 5 Ground 5 U101 Tuner PIN F...

Page 11: ...31 32 V 4 0 4 0 5 0 7 0 8 1 9 1 9 3 9 3 8 1 6 3 2 2 3 0 2 3 0 2 PIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 V 0 5 0 3 0 1 7 2 4 3 4 8 3 9 0 3 3 0 3 6 1 4 2 5 2 5 2 5 PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 V 1 9 5 0 2 4 2 4 2 4 3 1 0 3 2 0 1 8 1 7 0 3 2 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...

Page 12: ... will come into the centre of the 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 it will not move 10 Input a crosshatch signal Long lug P C MAGNETS P PURITY MAGNET 4 4 POLES convergence magnets 6 6 POLES convergence magnets Fig 1 PURITY MAGNETS 1...

Page 13: ...e the best convergence Fig 1 DYNAMIC CONVERGENCE ADJUSTMENT 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 FRONT VIEW RED GREEN BLUE BLUE RED lines in the periphery Fig 3 GREEN GREEN 3 Repeat 1 and 2 above and make the best convergence RED BLUE BLUE GREEN RED Fig 2 FRONT VIEW After adjustment fix the wedge at...

Page 14: ...ing pins of MT1389D to see if there is any short circuit break or faulty soldering 4 System in normal operation but the audio has no sound 1 Because the AUDIO DAC is built in MTK1389D IC you need to check the lower passing amplifying circuit and the MUTE circuit at the back of the LPF circuit Also check if there is any power supply to the LPF circuit 2 Check if the power supply voltage required fo...

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