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akira 14LA/ANZ Скачать руководство пользователя страница 36

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36

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Model No.: 14LAANZACDC
Version: 1.0

CIRCUIT ADJUSTMENT

Item

+B adjustment, TV signal receiving

Measuring equipment

TV SG (Signal generator)
Digital multi-meter

Preparation before adj.

The set is turned on
Connect the TV SG to RF input terminal of the set.

ADJUSTMENT PROCEDURE

1. Turn RP551 potentiometer to adjust B+ to specified voltage.
2. Check voltage for video out, vertical out, circuit work and audio power out as follow.

Voltage

(VOLT)

Tolerance

Video out

145

±5V

Vertical out

26

±1V

Circuit work

13

±1V

Audio power out

19

±1V

3. TV

signal

receiving

a. Press MENU key, to select PRESET item.

Press V+ or V- key, to select SEMI SEARCH or AUTO SEARCH item, press P+ key
to start searching.

b. Press P+ or P- to inspect the set if there is channel skipped, if so, searching again by

FINE as above described.

Item

Picture /AFT IF coil T101 adjustment

Measuring equipment

38MHz signal pattern generator Multi-meter

Preparation before Adj.

Adjust probe

1. Input the 38MHz /38.9MHz /45.75MHz point frequency signal (input level 80db ±5db) from

C110 terminal.

2. Connect the digital voltage meter to the cross-point of C137+ (capacitor positive pole).
3. Adjust T101 till the reading on the voltage meter is 3.6V ±0.02V.

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Содержание 14LA/ANZ

Страница 1: ...Colour TV Service Manual...

Страница 2: ...2 Model No 14LAANZACDC G Version 1 0 M M Mo o od d de e el l l 1 1 14 4 4L L LA A A A A AN N NZ Z Z A AC C C D D DC C C C C Ch h ha a as s ss s si i is s s S S Sa a an n ny y yo o o S S S0 0 02 2 2...

Страница 3: ...ETY INSTRUCTION 4 SPECIFICATION 8 KEY ICS ASSEMBLIES 9 SIGNAL PROCESS 10 SYSTEM BLOCK DIAGRAM 21 IC DATA SERVICE DATA 24 CIRCUIT ADJUSTEMENT 36 SERVICE MODE BUS DATA 42 TROUBLE SHOOTING FLOW CHART 50...

Страница 4: ...iation For continued safety replacement component should be made after referring the PRODUCT SAFETY NOTICE below SAFETY PRECAUTION 1 The TV has a nominal working EHT voltage of 24 5KV Extreme caution...

Страница 5: ...rotection afforded by them cannot necessary be obtained by using replacements rated at higher voltages or wattage etc Components which have these special safety characteristics in this manual and its...

Страница 6: ...holes in the back cover Ventilation is essential to prevent failure of electrical component Do not squash power supply cord under the television receiver If the television is to be built into a compa...

Страница 7: ...Neutral detergent is allowed Never use thinner or volatile etc 2 To ensure safety unplug the TV set when cleaning 3 Do not turn on the TV set in thunder days At lightning intervals pull off the power...

Страница 8: ...I M B G Video system PAL NTSC3 58 NTSC4 43 50 60Hz VHF C1 C12 UHF C3 C57 Receiving channel CATV Z1 Z37 Programs preset 255 Antenna input 75 unbalanced Audio output 3W THD 7 Power source 150 250V AC 5...

Страница 9: ...ription 1 N101 LA76818A Small signal processor 2 N451 TDA9302 LA78040 Vertical output circuit 3 N601 N602 LA4285 LA4287 3W 5W sound power amplifier 4 N701 LC863432B 54H7 System control micro processor...

Страница 10: ...hrough multi polarity IF amplifying and PLL sync detecting which then are output in two ways After one set of signal is trapped to eliminate the second SIF signal cored and pre video amplified Pin 46...

Страница 11: ...PROCESSOR The video signal processor in LA76818A mainly consist of an AV switch and filtering circuit luminance signal processor chroma signal processing color decoding RGB selection circuit which is...

Страница 12: ...esulting in display luminance and color not coinciding A luminance delay line integrated in LA76818A can adjust delay time of the delay line by the I2 C bus so that the luminance and chroma signals re...

Страница 13: ...r with high Q value and narrow oscillating range VC02 is an inner oscillator with wide oscillating range Firstly oscillating signals generated from VC02 and VC01 are discriminated in APC2 then the gen...

Страница 14: ...cuit for matrix processing to get a G Y signal The three color difference signals are sent to the contrast luminance control circuit together with the Y signal Before sent to the primary matrix the co...

Страница 15: ...D911 and VD921 ensuring V902 V912 and V922 end video amplifying triodes conducting for a period of time and high voltage of the CRT discharged quickly through the end amplifying triodes Thus spot is k...

Страница 16: ...lume control under the control of the N701 Pin5 Pin6 b Audio power amplifier The audio power amplifier comprises LA4285 for 14S01 The following give descriptions of the circuit on basis of LA4285 An a...

Страница 17: ...output in three ways The first set is sent to the AFC1 PLL discriminator to function as a reference phase signal The second set is separated out vertical frequency pulse by the vertical sync separator...

Страница 18: ...f signal is a horizontal frequency square wave pulse from the frequency divider functioning as a reference signal for the frequency and phase of the horizontal frequency pulse is locked in AFC1 by the...

Страница 19: ...nter the Locking mode Locking mode After identification the CPU provides a narrower range of count comparison value Only when vertical frequency of the received signal changes within a very narrow ran...

Страница 20: ...ine drive pulse with of 24 s which is supplied to base of V431 After amplified and pulse shaped by V431 and coupled by T431 the horizontal frequency pulse is supplied to base of V432 R433 and C433 are...

Страница 21: ...02 IF Pream plifier SAWF Z101 V705 V431 Line Drive T431 V432 Horizontal Output T471 FBT 115V 180V 25V 13V 20V Video Amplifier Formed of LA78040 N451 Vertical Output LA4285 87 N602 Audio Power Amplifie...

Страница 22: ...22 Model No 14LAANZACDC Version 1 0...

Страница 23: ...23 Model No 14LAANZACDC Version 1 0...

Страница 24: ...ded except IF phase locked VCO coil A buss eliminator is also built in the IC Video PLL detector improves video detection characteristic and picture sound quality greatly Video audio switchover switch...

Страница 25: ...25 Model No 14LAANZACDC Version 1 0 2 Block diagram...

Страница 26: ...IER AND STEREO 1 Feature TV sound output Exchangeable with LA4285 3W LA4287 5W pin Package SIP 10HD Pitch 2 54mm straight type Heat protection loop and over voltage protection loop built in Power outp...

Страница 27: ...27 Model No 14LAANZACDC Version 1 0 3 Refer to table 5 about functions and data of the LA4285 s Pins...

Страница 28: ...ossover characteristics DC coupling possible Feature Power amplifier Flyback generator Output current up to 2 App Thermal protection Description The STV9302 is a vertical deflection booster designed f...

Страница 29: ...29 Model No 14LAANZACDC Version 1 0 2 Block diagram 3 Refer to table 6 about functions and service data of LA78040 s Pins...

Страница 30: ...line 4 55 1560 640 12 I2 C bus clock line 4 55 1542 667 13 Auto brightness control input 3 8 945 577 14 R character signal input 0 9 0 920 714 15 G character signal input 0 94 0 913 701 16 B character...

Страница 31: ...0 706 38 4 43MHz crystal oscillator connector 2 8 790 716 39 APC filter 2 5 760 697 40 Video signal output 2 3 730 662 41 Video chroma scan part ground 0 0 0 42 Video signals input from AV terminals o...

Страница 32: ...5 1V 10 10 9 Key in port 0 3 6V 10 10 10 AFT signal input port 2 38 49 49 11 SCART detection no used to 1 5V 10 10 12 SECAM detection no used to 0 0 5V 6 5 6 5 13 CPU reset port 5 1V 4 6 4 5 14 OSD f...

Страница 33: ...00 3700 34 AV option control port 1 0 5V 3000 3700 35 DVD trigger 50 60 control when no select DVD 5 1V 3000 3700 36 DVD on off UHF select when no select DVD 5 1V 3000 3700 Table 4 Functions and servi...

Страница 34: ...9 75 6 Filter 9 28V 14 04 4 94 7 Negative feedback 9 28V 33 5 28 79 8 Power ground 0V 9 Output 10 3V 38 9 38 3 10 Vcc 23 6V 0 49 Table 6 functions and service data of LA78040 STV9302 N451 s Pins DT890...

Страница 35: ...9CV N551 s Pins DT890D Multimeter Ground Resistance Pin No Function Description Voltage of Pin V Measure with Red Probe while grounding Black probe Measure with red probe while grounding black probe 1...

Страница 36: ...work 13 1V Audio power out 19 1V 3 TV signal receiving a Press MENU key to select PRESET item Press V or V key to select SEMI SEARCH or AUTO SEARCH item press P key to start searching b Press P or P t...

Страница 37: ...color should be set in standard 1 Vertical size adjustment a Receive Philips testing PAL system signal b Press PROD factory button to start adjusting mode c Press CH button to select V SIZE option us...

Страница 38: ...SG The picture and sound must be normal 3 Press TV AV key to select AV input The picture and sound must be normal 4 AV output inspection Load a 75 resistor to VIDEO output terminal 1 Vp p video output...

Страница 39: ...ent procedure 1 Receive the cross hatch pattern signal 2 Turn the focus adjusting VR watching the screen and adjust the vertical line of mark to make the most thin Then the focus adj VR is set as clos...

Страница 40: ...ectly the option to be adjust 2 Adjustable items table OSD DISPLAY CORRESPONDING LA76818 BUS ITEMS NAME RANGE VARIABLE S BRI Sub Brightness Sub Brightness 0 127 R BIA Red Bias Red Bias 0 255 G BIA Gre...

Страница 41: ...signal PAL system 2 Use PROD FACTORY button to enter into adjusting mode 3 Press CH button to select OSD H POSI option Use VOL button to adjust the value of OSD H POSI till the characters appear in t...

Страница 42: ...ptions consist of 13 pages from MENU 0 to MENU 12 All the adjusting menus will be available During practical manufacturing most of the options are preset in a mother chip Products of the same batch on...

Страница 43: ...5 normally 8 is selected YUV B Y DC 8 B Y DC setting for YUV range 0 15 available only if LA76818 is used YUV R Y DC 8 R Y DC setting for YUV range 0 15 available only if LA76818 is used Page 3 MENU 2...

Страница 44: ...LY OPEN 2 ONLY CLOSE 3 BOTH SCREEN TIME Black background time interval before drawing curtain 0 7 seconds SCREEN TYPE Screen mode 0 begin from middle normally 1 wateriness act Page 5 MENU 4 TUNER OPTI...

Страница 45: ...de DVD PORT DEF DVD port setting 0 last way AV second way to back Page 7 MENU 6 GAME OPTION Game function option 0 NO 1 YES CALENDER Perpetual calendar option 0 NO 1 YES ZOOM OPTION ZOOM function opti...

Страница 46: ...RAB OSD Select ARAB OSD 0 NO 1 YES Page 9 MENU 8 STEREO OPT Stereo option 0 INT 1 one way PWM 2 two ways PWM 3 LV1116 LV1116 GAIN LV1116 gain select 0 6dB 1 4dB 2 0dB 3 4dB 4 7 6dB SUR MODE LV1116 sur...

Страница 47: ...PUP option of decoding chip 0 low 1 high normally select 1 VIDEO LEVEL Corresponding to the VIDEO LEVEL option of decoding chip range 0 7 normally 7 is selected FM LEVEL FM LEVEL option of decoding ch...

Страница 48: ...to the C VCO ADJUST option of decoding chip 0 1 when select LA76818 C VCO ADJ Corresponding to the C VCO ADJUST option of decoding chip 0 0Hz 1 30Hz 2 60Hz 3 90Hz when select LA76818 Page 13 MENU12 w...

Страница 49: ...ected BLK STR GAIN Corresponding to the BLK STR GAIN option of decoding chip range 1 3 normally 2 is selected A MONI SW Corresponding to adjusting option A MONI SW 0 1 of the decoding chip normally 0...

Страница 50: ...k whether the line of B1 110V is normal Check VD551 V551 Check V431 waveform normal or not Check filament voltage Check B3 190V line Check horizontal output transformer V431 V432 V902 V922 Check R491...

Страница 51: ...gnal of N101 42pin Check C211 Check the video signal of N101 17pin Replace N101 Check N101 T101 A101 N703 Check voltage cross N101 11 13 pins Check N701 Replace N801 Horizontal raster no vertical scan...

Страница 52: ...rm on N801 15pin Check waveform of N801 4pin Check C822 R834 R844 Check N101 Check waveform of N601 N602 3 Check voltage of N601 9 Check N601 N602 Check C622 C632 B901 B902 No color Check relevant set...

Страница 53: ...W 1K 5 17 R808 812 814 815 819 932 933 RT13 1 6W 1 2K 5 4 R109 202 567 804 RT13 1 6W 1 5K 5 1 R722 RT13 1 6W 1 8K 5 1 R523 RT13 1 6W 2 2K 5 5 R401 408 707 759 831 RT13 1 6W 2 7K 5 2 R705 900 RT13 1 6W...

Страница 54: ...W 150 6 1 R400 RT14 1 4W 470 5 1 R582 RT14 1 4W 560 5 1 R581 RT14 1 4W 1 8K 5 1 R453 RT14 1 4W 2 2K 5 1 R526 RT14 1 4W 3 9K 5 1 R565 RT14 1 4W 15K 5 1 R522 RT14 1 4W 22K 5 1 R556 RT14 1 4W 51K 5 2 R55...

Страница 55: ...0pF J 2 C901 921 CC1 06A SL 50 63V 470pF J 3 C121 771 772 CT1 06A 2B4 50 63V 1000pF K 1 C123 C102 110 111 112 116 118 119 122 205 245 C274 275 277 279 405 556 568 571 583 607 CT1 06A 2F4 50 63V 0 01uF...

Страница 56: ...13 407 713 806 811 CD110 50V 4 7uF M 2 C456 708 CD263 160V 4 7uF M 1 C444 CD110 160V 10uF M 1 C565 CD110 160V 100uF M 1 C561 CD110 250V 10uF M 2 C562 904 CD293 400V 100uF 10 1 C507 CL11 50V 63V 2200PF...

Страница 57: ...VD519 HZ9A2 1 VD411 IN4741 11V 1 VD570 upc574J CW574 KA33V 1 N705 LA4287 5W 2 N601 602 TA78M09 9V 1 N551 LC4053B CD4053B 1 N801 LC863532B 54H7 1 N701 LA76818A 1 N101 LA78040 STV9302 1 N451 BR ST24C08...

Страница 58: ...58 Model No 14LAANZACDC Version 1 0 Components Name Specification Q TY Parts Location REMOTE RECEIVER HS0038 AT138A 1 A701 TUNER 5V 470M 1 A101 ET 5C1E EV100K A LF011 1 L501 A TX0040 21 1 T431...

Страница 59: ...2 1K C805 16V470 C808 16V10 R808 1K R807 10K C806 16V10 C807 16V10 R812 1K R811 10K C810 16V10 R815 1K R816 10K C809 16V10 R814 1K R813 10K XS803 AV1 B9 9V C801 16V220 C802 0 01 R818 100 XS801 2 AVout...

Страница 60: ...60 Model No 14LAANZACDC Version 1 0 EXPLODED VIEW...

Страница 61: ...61 Model No 14LAANZACDC Version 1 0...

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