la service manual – Datasheet PDF, IC Circuit. USOC(LA) SERIES SERVICE MANUAL Table of Contents 1. Preface. Find solutions to your la 7n datasheet question. Get free help, tips & support from top experts on la 7n datasheet related issues. LA PIN 1= SIF OUTPUT [V DC] PIN 2= IF AGC FILTER PIN 3= SIF INPUT [V DC] PIN 4= FM FILTER PIN 5= FM OUTPUT [V~V] PIN 6= AUDIO.
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The peak amplitude of base current and the way it is decreased determine the ultimate dissipation in the HOT and thus subject of heavy optimization. There are 3 freedoms: Note that this lla76931 not be the same as what is commonly called linearity which would likely affect only one side or gradually change across the screen. The maximum drive current of Q1 is 1mA. It need pull-up or pull-down resistor.
LA Datasheet PDF – 64Pin IC for Color TV Receiver
In all casethe power to the horizontal output transistor HOT of the horizontal deflection system is obtained directly from the DC voltage power supply. They do not cause an increase of the stored magnetic energy so a heavy load is not a problem. Color killer set too high internal control if it has one. Some possibilities in no particular order: D Operating supply Oscillation voltage range stabilizing time typ. To improve the buzz characteristic, we recommend the application circuit as below: In this case, the stability of the sync signal is depended on external signal.
This function can adjust the Over —shoot component of the Y signal. This will cause the current variety in the collector of V, this various current is amplified by V and controls the b-e current in of V Ib.
By simply putting a capacitor in series with each coil, the sawtooth waveform is modified into a slightly sine-wave shape the top and bottom are somewhat squashed.
A more important rational is that a transformer is nice easy way of impedance matching the horizontal driver circuit to the few ohm input impedance of the horizontal output transistor base which requires upwards of several amps for proper drive.
You should not be touching components with the device powered and plugged in at leastnot until you really know what you are doing! This must be done in a controlled mannernot just a hard shutoff to minimize stress on the HOT-but that is another story.
(PDF) LA76931 Datasheet download
Enable Killer circuit Ever when the color control is minimized, but maybe there is still has little color left in the picture. Brightness Control Control brightness. The flow chart is as follows: The base-drive to the HOT must have been switched on before this point! When V is onthe datasheey flows through pin3 and pin7 of T, then be converted magnetic energy to be stored. The fly-back pulse is input via R1 and R2.
Data pin IC LA | bengkel electronic
When the cathodes heat up ,you will see an even picture with diagonal retrace lines and then it will switch off. Because the electron beam can not move in the horizontal orientation, the failure should be in the horizontal deflection circuit.
One alternative is simply to cut the wire in a location that is well away from any place to short out, solder, and then do a most excellent job of insulating the splice. Please use this function when adjust RGB Bias. Also, in case of develop many chassis, this can contribute to speed up the development period.
An open s-cap will result in no horizontal deflection – a vertical line. In that case the beam current will not work and the set should switch off automatically, usually within a few seconds after applying power. C2 is a smoothing capacitor.
N is an photocoupler that implements light – electric conversion. However, there could be several interrelated problems if a comon supply voltage were missing, for example, if it is dtasheet knob, datssheet it should be varying the control grid voltage relative to the cathodes of the CRT, this is not likely to be a very complex circuit. This is called non-simultaneous base drive, which is most common.
So we call it self-exiciation. The startup current cross the B-E of V and make it working in the amplificatory condition. Brightness control has no effect The following assume that the picture is fine but the brightness is fixed-probably at datasueet high a level. The value of C1 is depending on the speed of AGC, sag etc, and the recommend value is about 0. No sound In this kind of failurefirst of all we should observe if there is the picture on the CRT.
Control video output amplitude. This IC has a function which is used for horizontal position fine adjustment: MP is adjusted in the wafer line Adjustment has done l76931 mass production products. The dynamic range of it is 3.
That also reduces the EHT even further, but the deflection current has a stronger effect on the picture width than the EHT. The blanking output level of RGB is about 1. Horizontal output transistor specs and substitution: B The flyback also generates the HV and secondary output voltages and the primary current might then be affected by these and change as a function datawheet beam current picture brightness or audio level although feeding the audio amplifiers from LOT windings is not common anymore.
Regulator is based on the above theory.