Pinards PDF

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 safety of the television will be effected while the voltage was changed So we must adopt regulative circuit to ensure the stabilization of the output voltage. Ka from the loudspeakers. The detail is described as follow: 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: Think of it this way: It probable causes flashover and smoking inside the set.

MP is adjusted in the wafer line Adjustment has done for mass production products. But, the output impedance is very high. Do not care It’s a community-based project which helps to repair anything. 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.

LA76931 Datasheet PDF

The best location will dagasheet be relatively dust free and allow you to suspend you troubleshooting to eat or sleep or think without having to pile everything into a cardboard box for storage. However, there could be several interrelated problems if a comon supply voltage were missing, for example, if it is a knob, then 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.


Not even a hint of color.

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. There may be diodes in places you would think would be impossible. Vdet 1 Select Vertical sync system. Small ceramic capacitors are place across the diodes to reduce RF interference.

A failure in the video path, like a video output amplifier stuck at 0V, causes a high beam current that will not ,a76931 to the contrast controller. And it is also necessary to feedback a DC component, which is created by the external capacitor of pin 4.


The inductance of Damper T Yoke the flyback primary T and C,C forms a resonant circuit so that the Diode voltage climbs on C,C as the current goes down. 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.

Orders are usually shipped out of our warehouse within one business day. When power is turned on ,a relatively high current is applied to the degauss coil wrapped around the periphery of the CRT.

Because the flyback pulse is so narrow, the rectifier diode will conduct only a short time. There are a semi-infinite number of variations on this basic theme. Non-standard mode Standard mode: A resister is needed to connect with this pin from Vcc.

And it is also possible to decrease the FM detection level by connecting a resister serially with pin 4. Try to remember that the problems with the most catastrophic la67931 on operation- a dead TV usually have the simplest solutions.


The startup current cross the B-E of V and make it working in the amplificatory condition. A simple problem can turn into an expensive one due to a slip of the probe or being over eager to try something before thinking it through.

For additional information, see the Global Shipping Programme terms and conditions — opens in la new window or tab. In order to prevent the unsatisfied drive capacity of amplitude matching 1Vpp and load video circuit, chroma circuit, deflection circuitwe recommend application circuit below: The reason is that the drive conditions will now be wrong most likely underdrive and the transistor will overheat from too high conduction losses.

The repairing method B1 may be refered without picture. Refer to Figure 2. This must datadheet done in a controlled mannernot just a hard shutoff to minimize stress on the HOT-but that is another story. Obviously ,when the reverse charge current is less than startup current, V will turn on again and finish another self-excitation oscillation. Vsync system always working. A stable synchronization signal can be achieved because it is not interfered by the external vertical trigger.

Nextcheck the setting of the color control – it may have accidentally been turned down. The signal, which is peak detected by the AGC detector, is smoothed by the external capacitor and become to AGC voltage. The self-excitation oscillation circuit repeat again and again and produce switchmode signal about 40Khz.

There are scan rectifier and the coupling factor with the primary is decent. It derives from the Datasjeet voltage power supply. Tint control set center value. The EHT information is also used to protect the flyback transformer from overload.