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Two components in the main circuit to your TV should be suspected. The first one is its Tuner itself. if tuning frequency of the tuner drift with change in atmospheric temperature, or if the Main system memory IC do not store the tuned frequency well, this type of fault will happen. Anyway, the work is a skilled one, and a user who have no knowledge about electronics cannot make this fault right. It will be best for you to contact any experienced service technician.
Just inside the coarse focus knob you will see a "chrome" ring with holes it it. That ring needs to be tightened just a bit. It will make the coarse focus knob stiffer so tighten only enough to stop the downward drift of the stage. A funny looking tool should have come with the scope. It is used to adjust this "tension" ring.
First, a scope of this grade will not be completely in focus as you move from one magnification to the next. But it should be close enough that you do not loose your point of interest.
Be sure you are not pressing down on the stage specimen platform as you change magnifications. It is very sensitive to pressure.
Also, be sure that the coarse focus tension is tight enough that the platform is not drifting down imperceptibly as switch magnifications. Look through the scope and watch if the image goes out of focus while you are watching it. If so, you have what is called "stage drift".
This is corrected by tightening the tension on the coarse focus knob.
The tension adjustment is on the coase focus shaft. It looks like a chrome ring with about 3 holes in it. There should have been a strange looking tool that came with your scope. It is used to adjust the tension. If your specimen is "drifting" out of focus, simply tighten the tension ring a little bit at a time until the specimen no longer goes out of focus. Do not get it so tight that it is not easy to operate the coarse focus knob.
Hello, This will require you opening the back cover of the television to test some component with the use of an ohmmeter. This may be a slight drift - like someone is messing with the fine tuning or such a substantial change in tuning frequency that the channels go by as though you are surfing.
Possible causes depend on tuner type:
1. Quartz tuner (10 button direct access digital synthesizer) - For a slight drift, a component is probably changing value, possibly the crystal in the reference oscillator. For gross changes - flipping through channels - it is more likely to be a digital control problem - the microcontroller is misdirecting the synthesizer to change frequency.
2. Varactor tuner (buttons but not direct channel access) - If only a single pushbutton selection is the problem, the the varactor tuning diode for that button is probably changing capacitance. If all channels in a band (Vl, Vh, U) are having a problem, it is more likely to be a drifting D/A or faulty AFT (Automatic Fine Tuning) circuit or power supply.
3. Turret or switch tuner (Knobs) - A component like a capacitor is changing value.
You will have to get in there with a heat gun or cold spray and track it down the old fashioned way. At least, the problem is almost certainly localized to the tuner box (and possibly the controller if applicable).
As noted, gradual slight changes in tuning are likely due to frequency determining components drifting.
Uncontrolled channel surfing is probably a logic problem. For the quartz tuner, this could still be marginal connections causing the microprocessor to misdirect the synthesizer to change channels.
For the latter case, particularly, the cause may still be bad connections resulting in loss of channel memory and/or erratic behavior. Take care...
Hi there its happens when the lens not ready for work. Some how its not able to stable his focus method. That's why its stuck. There is a chances of lens guide pin disturbed or damaged & thats why continues failure. Its mean he inform you there is a system error. So please visit the service center for repair that. Its a very common & repairable problem. Thanks.
No, your camera does not have a manual focus button.
Even if it did, you wouldn't be able to keep focus while zooming.
Only very expensive lenses maintain focus regardless of focal lenght.
The correct procedure is to zoom and then focus.
This can be a number for things. Believe it or not dust or cig smoke in LCD and pix tube projected TVs turns up looking a lot like focus error. Is the focus bad or do you have a convergence error (red, blue or green shading) Is there any smearing or blooming to the pix? The other comment for you is the TV is 9 years old I personally consider this very close to the life of the product. A simple good pix would tell volumns for someone like me (may need some resolution on the pix).
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