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Chapter Two Horizontal Deflection. And it is also possible to decrease the FM detection level by connecting a resister serially with pin 4. Enable Killer circuit Ever when the color control is minimized, but maybe there is still has little color left in the picture.

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Concerning to the phase and the width dxtasheet blanking pulse, as before waveform is made up and oa76931s suitably in FBP input circuit. When power is turned on ,a relatively high current is applied to the degauss coil wrapped around the periphery of the CRT. It will undergo a linear increasing process. A set of rectifiers – in a bridge configuration – to turn the AC into DC.

The maximum drive current of Q1 is 1mA. As a result they will be easier to deflect by the magnetic field, and the picture size will grow. Vsync system always working. It probable causes flashover and smoking inside the set.

It is called Signal-input way. Scrape off all of the old glue and then clean thoroughly.

Depending on the accurate level of horizontal free-run frequency we need, a low offset external resister is requested.

Note that to the average person, the obvious question becomes: The repairing method B1 may be refered without picture. Safety first – know the hazards associated with the equipment you are troubleshooting.

This make the current between pin3 and pin7 of T51 1 to decease. This must be done in a controlled mannernot just a hard shutoff la7631s minimize stress on the HOT-but that is another story. Control 4 Select AKB ref. When the video output amplitude more change, use this control. It has the effect of modifying the sawtooth current into a sine-wave shape. We can use V to bypass the current flowing into base of V in order to control the on-off time of V Repair any damaged traces. The best location datsheet also be relatively dust free and allow you to suspend you troubleshooting to eat or sleep or think without having to datashfet everything into a cardboard box for storage.


There used to be other spread factors influencing the dynamic transistor parameters but these have been mostly eliminated by better process control at P.

This is a balanced input and it needs a 0. Think of it this way: Ultimately it may reach a level where the transformer core may go into saturation. When we add in the joke components only the horizontal deflection coil and S-correction capacitor or S-cap are actually shown above conditions are only slightly more complex: An S-cap that changed value or selected to be the wrong value will result in distortion at the left and right sides of the screen: The switchmode power supply automatic regulates the current in the base of switch transistor to keep the out stable.

There are a semi-infinite number of variations on this basic theme. Linearity over the two main axis should now be good.


While stating that your experience in these endeavors is measured by 7nn number of scars you have may be stretching the point, expect to screw up – we all can point to that disaster due to inexperience or carelessness. Also, in case of develop many chassis, this can contribute to speed up the development period.

Color killer set too high internal control if it has one. The balanced error generated in the SAW filter and the printed plate can be canceled and the weak field characteristic may be improved by using C1 to cross the IC input pin layout on the printed plate. This current will smoothed at the external capacitor of pin 7 and control Snd-VCO.


Timing is not very critical as long as it happens between the end of the flyback and zero crossing of the summed current. Note that there is the possibility of damaging the known good part by putting it dstasheet a non-working device or vice versa. The function of the voltage power la76931 is to take the AC line input and produce various DC voltages.

The variational current produces la769331s kind of pulse voltage in all coils l of T including positive feedback coil pin1-pin2. This mode is used when tuning or some unexpected conditions.

LA76931 7N-58G1

The level of influence is depending to the pattern lay-out of the chassis. Excessive ringing or other corruption would indicate a problem in the flyback,yoke, or elsewhere. Then the discrepancy phase will transform to be current and output to pin 7.

The value of C1 is depending on the speed of AGC, sag etc, and the recommend value is about 0. 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.

This is usually safe to do in such case and will quickly identify which unit need work. Here is another thing to try: Select vertical sync system. It need pull-up or pull-down resistor. This is called the average beam current limiter. N is an photocoupler that implements light – electric conversion.