Page 258 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

8 Turn Off Special Feature or Developer Mode:
Running some special features like Talk Back or gestures may cause your phone screen not to respond. If
you have enabled them, follow the steps to turn them off. For the Talk Back feature, simply go to Settings >
Accessibility > Talk Back and tap the switch. For the gestures feature, just go ahead to Settings gt; Advanced
features gt; Motions, and Gestures and tap all the switches.
The developer mode allows users to customize settings and remove certain limitations that are restricted. When
you turn on Developer Options, certain Android devices start malfunctioning. If your touch screen is not functioning
properly after turning on Developer Options recently, you should turn off Developer Options. Here are the steps
to follow.
Step 1: Open Settings apps on your Android devices.

Step 2: Go to the System option, which is generally available at the bottom.
Step 3: Tap on Developer Options. You can understand if the option is turned on.
Step 4: You should turn off Developer options by toggling it off.
Step 5: You should restart your device and see if the Android touch screen randomly stops working.
9 Turn On Safe Mode:

Whenever you suspect that the issue on your device is due to software and apps, you should enter into Safe
mode. In Safe mode, the device works with the basic and essential software and hardware support. If your touch
screen works in safe mode, you can rest assured that it is a problem with some app or program you downloaded.
Start with recently downloaded apps and go from there.

You can take the below steps to turn on safe mode.
Step 1: Press and hold the Power button for some time to restart your device.
Step 2: Keep holding the Power button. When the manufacturer logo appears, release the Power button.
Step 3: Immediately after you release the Power button, press and hold the Volume Down button.
Step 4: Once your phone enters safe mode, you will see the Safe Mode label in the bottom-left corner.

10 Reset Device to Factory Settings:
When uninstalling the recently installed apps does not solve the problem, you can perform a factory reset. It will
restore your device to its initial state when you unbox the device. It means all the installed apps and the changes
made to settings will be gone. All the phone data will be erased, including any malware present on your device
that could be causing the issue.
Concept of ultrasonic cleaning:
Ultrasonic cleaning uses high-frequency, high-intensity sound waves in a liquid to facilitate or enhance the removal
of foreign contaminants from surfaces submerged in an ultrasonically activated liquid. Ultrasonic technology
has more recently been used in a growing number of applications involving chemical processes and surface
conditioning, which, although outside the classic definition of cleaning, use basically the same techniques.
Demands for increased cleanliness have driven the development of increasingly sophisticated technology in the
field, particularly within the past decade. Today it is possible to customize ultrasonic waves to optimize effects
in a wide range of applications, as described by Puskas and Piazza (2000). Recent developments in ultrasonic
washing of textiles also have occurred (see the Appendix).
Ultrasonic cleaning is a technology unique in its ability to remove contaminants that other technologies cannot
remove and in its ability to effectively clean areas that are not accessible using other technologies. Competing
technologies include spray washing, turbulation, agitation, and brushing, among others. In general, these
technologies are “line of sight” in nature; that is, there must be direct access to the contaminated surface for them
to be effective. In all of these cases the physical energy is delivered indirectly. In a spray system, for example, the
energy for the spray stream is imparted by a pump. Pressurized liquid is delivered to a nozzle, which increases
the stream’s velocity and directs it toward the surface to be cleaned. Cleaning is achieved by the impact of the
high-velocity stream with thesurface being cleaned. Not only is energy lost during each step of the process, but
only that energy in the portion of the stream that ultimately impacts the cleaning target provides benefit; the rest
is lost. Sprays are not capable of reaching areas hidden from direct access of the spray nozzle to the surface.

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CITS : E & H - Electronics Mechanic - Lesson 130 - 145