Page 187 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

Working Principle, operation of remote control

1 User Input
• The user presses a button on the remote control corresponding to a specific function, such as power on/off,
volume control, or channel selection.

2 Button Activation
• When the user presses a button, it completes an electrical circuit within the remote control.
3 Signal Generation
• Upon button activation, the remote control’s internal circuitry generates an electrical signal corresponding to
the selected function.
• In the case of an infrared (IR) remote control, this signal is typically a series of modulated infrared pulses.
For other types of remotes, such as RF or Bluetooth, the signal may be transmitted using radio frequency or
Bluetooth technology.
4 Signal Transmission

• The generated signal is then transmitted from the remote control to the target device, such as a TV or other
electronic equipment.
• In the case of an IR remote control, the signal is emitted as infrared light from the IR transmitter (LED) located
on the front of the remote control.
5 Reception by the Device
• The target device, equipped with a corresponding IR receiver (such as the TV), receives the transmitted signal.

• The IR receiver detects the incoming signal and processes it to extract the command encoded within the
signal.
6 Command Execution

• After decoding the received signal, the target device executes the command associated with the received
signal.
• For example, if the user pressed the volume up button on the remote control, the TV would increase the
volume accordingly.
7 Feedback (Optional)
• In some cases, the target device may provide feedback to the user to indicate that the command has been
received and executed successfully.
• This feedback could be in the form of a visual indicator on the device’s display or an audible sound.
General fauts in remote control
General Faults:

1 Non-Responsive Buttons:
• Buttons on the remote control may become unresponsive or intermittently work due to wear and tear, dirt
buildup, or internal circuitry issues.
2 Interference
• Radio frequency (RF) remote controls may experience interference from nearby electronic devices or wireless
signals, leading to erratic behavior or non-functionality.
3 Physical Damage
• Dropping the remote control or exposing it to moisture can cause physical damage to internal components,
leading to malfunctions.

4 Faulty IR Transmitter
• If the IR transmitter (LED) on the remote control is malfunctioning or damaged, it may fail to emit infrared
signals properly, resulting in non-operation.

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CITS : E & H - Electronics Mechanic - Lesson 100 - 107