Can I fix it if I have a problem with my CD 20

The first method is to use bananas.

Items required for this method:

A banana A banana peel.

A spray.

Steps to repair:

1. Take out a frayed CD ***

2 Slowly make circular motions on CD *** with freshly cut bananas.

3Next, use a banana peel to wipe off the banana stuck to the CD ***, the banana peel will make the disc shinier and cleaner.

4. Take a clean cotton cloth to wipe off the residue on the surface of the CD ***, and do a circular movement during the wiping process, and use appropriate force, wipe for a minute or two.

5Finally, spray a small amount of detergent (or water) with a spray and wipe dry.

If the above method is not enough to repair your CD, it means that your CD is very damaged and you have to buy a new one.

However, since it is a set of suggestions, you can ask the publishing company if you can mail order the CD you damaged, or whether you can re-burn a copy of the content of the CD from the Internet** and use a computer that can burn the CD, which is more economical.

What kind of bad law is it? Is it too bad to read? This is important.

If the surface is damaged, the degree of damage must be measured.

You can find the corresponding studio to fix it for you, but I can't guarantee what the effect is.

But as long as the disk can still be read now, you don't have to worry about it, keep it well, no problem.

Or find a good plate and re-gram one, OK

I'm sorry to tell you: it can't be fixed.

The reasons why the CD player does not make sound are as follows:

If the microcontroller is broken, that is, the decoder is broken.

Audio conversion and sound processing circuit problems, using the signal cable to connect the audio output behind the machine to other normal power amplifiers can be tested.

The integrated IC of the power amplifier is broken, which is very likely, because the heat dissipation is very large, and it will generally break if it can't withstand the high temperature.

Solution: Check whether there is any problem with the line; Check the audio output connector or check the audio cable.

There is no problem with the disc; Some discs are not of good quality and are easy to be damaged, and some CD players do not make a sound from the old disc, and the new disc is fine.

If there is no problem with the above two, you can only go to a professional shop for repairs.

According to your problem, judging from my experience, the CD player does not make a sound, perhaps due to the quality of the CD disc, and the CD disc is the same whether it is genuine or pirated, it is just a copyright problem, some CD players also have the same problem as yours, the old disk does not make a sound, and the new disk is fine. Another reason may be that it is too cold, and it can sometimes be solved by warming up for a few minutes after opening. Of course, there is no problem with the machine.

If you haven't come out of the warranty yet, it is recommended that you go to the repair point to have a look!

The tips for fixing a CD player not reading a disc are: clean the disc and head, check the power supply and cables, and adjust the reading position of the CD player.

1. Clean the disc and bald head: The reason why the CD player does not read the disc may be that the disc or bald head is dirty, it is recommended to use a professional disc cleaner and a bald head cleaning stick to clean the disc and bald head, and then reinsert the disc to see if it can be read.

2. Check the power supply and wires: if the CD player does not read the disc, there may be a problem with the power supply or wires, check whether the power plug is plugged in tightly, whether the wires are damaged or in poor contact, if so, replace the wires in time.

3. Adjust the reading position of the CD player: the incorrect reading position of the CD player will also lead to the situation that the disk is not read, at this time, you need to adjust the reading position of the CD player, the specific method is to open the CD player, find the adjustment screw of the reading position, and gradually adjust it to the position that can read the disk normally.

Reasons for CD player jamming

The bald head is the key to the CD player to read the CD, if there is a problem with the bald head, it will cause the CD player to be unable to read the CD normally, thus jamming the disc. In this case, we can try to clean the bald head with a bald head cleaning tablet, or send it to a professional repair shop for overhaul.

A CD machine reading system consists of many parts, and if any one of them fails, the CD player will not be able to read the CD properly, and the disc will be jammed. In this case, we need to send the CD player to a professional repair shop for overhaul.

If the disc is of poor quality, there are scratches or stains on the surface, which will cause the CD player to fail to read the CD normally, and the disc will be jammed. In this case, we can try to use a cleaning disc or replace it with a new disc to solve the problem.

Repair method for minor damage to disc:

2. The second step is to wipe off the dust on the damaged disc with warm water.

3. In the third step, if there is stubborn dirt or grease on the disc, gently rub it with your fingers when cleaning, and at the same time scrub it with mild liquid soap, water or alcohol. When wiping the disc, wipe it straight from the center to the edge to prevent further scratching.

4. The fourth step is to shake off the water on the saucer, and then let the saucer air dry. Remember not to dry the disc directly with a towel or cloth, which will cause more scratches, and do not dry the disc in the sun, just dry it with air.

5. The fifth step is to clean and air-dry the slightly damaged disc and repair it. You can put the straights on the player and try to play the effect. But the problem may still persist after cleaning.

Note: When scrubbing discs, they must be handled with care and in a relatively clean environment. Do not use too much force when scrubbing.

This one can't be repaired, and the data has been destroyed.

c is false, lg(1-x) is monotonically increasing on x belongs to r, and only monotonically increasing on (0,1) that does not meet the requirements of the problem.

d is false, the axis of symmetry of this function is 1 2, and k 0, so it decreases on (0,1 2) and increases on (1 2,1).