Subject: Computer Hardware and GSM Repairs 1 | Level: Senior Secondary (WASSCE)
This module covers standard workshop safety, handling repair tools, and understanding fundamental maintenance rules for preserving and fixing mobile devices.
Key Topics:
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According to mobile phone maintenance guidelines, which of the following activities is best described as preventive maintenance?
Cleaning the charging port and internal components
Cleaning is a routine action taken to prevent future hardware failures, making it a classic example of preventive maintenance, whereas replacing broken parts is classified as corrective maintenance.
Which of the following describes the two variations of a multi-meter explicitly mentioned for use in GSM repairs?
Digital and Analog
Multi-meters come in two main variations: digital, which provides precise numerical readouts, and analog, which uses a moving mechanical needle to display measurements.
A technician is utilizing a soldering iron to replace a damaged charging flex. Which safety protocol must be implemented specifically to handle the byproducts of this tool?
Ensuring adequate ventilation for soldering fumes
Soldering produces harmful chemical fumes from the flux and solder wire. Ensuring adequate ventilation is a critical safety protocol to prevent inhalation of these toxic byproducts.
A hot air rework station is commonly referred to by which alternative name in the repair guidelines?
Heat gun
A hot air rework station is commonly referred to as a heat gun. It is used to blow precisely temperature-controlled hot air to melt solder for surface-mount components.
If a mobile phone is diagnosed with a physically damaged microphone, the act of desoldering the old part and soldering a new one is an example of:
Corrective Maintenance
Corrective maintenance involves fixing or replacing components that have already failed or broken, such as removing a damaged microphone and installing a functional one to restore operation.
When implementing anti-static precautions during motherboard repair, which equipment is standardly utilized according to safety procedures?
ESD bands
ESD (Electrostatic Discharge) bands or wrist straps are standard safety equipment worn by technicians to safely ground any static electricity and prevent it from discharging into sensitive microchips.
Which of the following is listed as a primary screwdriving tool shape used in mobile phone dismantling?
Torx
Torx is a very common type of screw used in mobile phones. Technicians rely heavily on Torx screwdrivers to safely dismantle device housings without stripping the star-shaped screw heads.
Which specific battery technology is highlighted as a primary hazard regarding fires in mobile phone repairs?
Lithium-ion
Lithium-ion batteries are highly volatile if punctured, bent, or exposed to extreme heat, making them a primary fire and chemical hazard during mobile phone teardowns and repairs.
A technician needs to recreate the grid of solder connections underneath a detached motherboard chip. Which specialized item from the equipment list should be used?
BGA re-balling kit
BGA (Ball Grid Array) chips connect to the motherboard via a grid of tiny solder balls. A re-balling kit contains the metal stencils and solder paste needed to recreate these connections when a chip is removed.
Which tool is explicitly recommended to provide external voltage and current testing when diagnosing mobile phone power faults?
DC power supply
A DC power supply allows a technician to inject a specific, controlled voltage and current into a logic board, making it an essential tool for identifying short circuits, dead components, and power faults.
