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teleshema - Free operating instructions of consumer electronics

There is No reception of programmes in the sub-bands 1 - 6 MV

There is No reception of programmes in the sub-bands 1 - 6 MV There is another option, when the picture and sound are missing when you switch into sub-bands. The switch can be touch and can be disk, in any case, the typical fault is searched in this way. We are primarily interested in block SC - M-24-2, it is not far from the TV chassis relative to the antenna socket. Find him and reveal. Look visually all one color and there is a clear difference from overheating or anything else. If all OK, then take the circuit and watch the channel gain collected on V5 VT2 and the diode VD11. Take the tester and relatively common wire look what we have on the emitter of VT2, if there is no voltage or it is low, you will need to check as "deset" diode VD3 paired with a capacitor C20. Just passing look on level control voltage of the varactors VD1-VD13, and make sure that the varactors in order. First check the connector x2(A1) in the device selection. Often it is all in the connector, or distort, or oxidized and rarely came off ration. But it could be another case is when one has to look SVP-4-6 (is another option) there are usually flies cascade led by transistor VT18. If there is a block CCA-1-15, then they need to pay attention to the transistor VT19. Again, this kind of malfunction I called the vagus, it can appear on occasion and just disappear. I think that the replacement of these main elements solves everything pretty quickly. Changed everything and usually of such a failure is forgotten.

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