1. Computer Repair & Maintenance

2. Ainsley Smith
Tel: Ex 3374

3. Dismantle & Assemble a PC Today you will :-
Prepare a log of available hardware
Prepare a risk assessment
Draw a diagram of how ports & cables are connected
Assemble a pc from a range of available parts
Learn how to store and pack ICT equipment
Perform safety checks
Test for PC functionality

4. Dismantle & Assemble a PC Risk Assessment & Safety factors
Main Hazards ?
Electrical
Electrical shock or Burns - Students are not permitted to work alone in laboratories
Someone electrocuted and still attached to a supply is still `live'.
Current over 10mA passing through the body is painful; current in excess of 100mA passing through the body is lethal.
Death has been caused by as little as 40 Volts
Never dismantle the actual PSU in your PC. This unit contains potentially lethal mains voltages, even when it is disconnected from the supply. They are not user-repairable. If it fails, replace it with a new one.
The primary cause of injury or death is the passage of electric current through the body. Consequential injury, possibly severe, can result from violent muscle reaction to the current.
The current can be supplied from a number of different sources 240V AC; DC supplies; EHT voltages. Someone electrocuted and still attached to a supply is still `live'.
The amount of current passed through the body is determined by the points of contact, the voltage applied and the skin condition (moist or dry). Skin resistance may vary from under 1000 ohms for wet skin to 500Kohms for dry skin.

5. Dismantle & Assemble a PC Risk Assessment & Safety factors
In practical terms the following points should be noted: -
Do not attempt to modify or service electrical equipment unless it is disconnected from the supply
Fuses of the correct rating must be fitted to all electrical equipment
Electrical switches have a live side even in the switched off position
The outer cover of any mains cable must always be securely held by the cable grips on the plug.

6. Dismantle & Assemble a PC Risk Assessment & Safety factors
Main Hazards ?
Electrical
ESD –
Wear an anti-static wristband
If the PC is grounded, touching its frame will ground you
The average person can carry up to 25,000 volts of static charge at any given time
CPUs and memory chips of any kind are highly vulnerable to ESD
you may soon start to notice random memory errors, blue screens
Try not to open up computers on thick carpets
Electrostatic Discharge
The primary cause of injury or death is the passage of electric current through the body. Consequential injury, possibly severe, can result from violent muscle reaction to the current.
The current can be supplied from a number of different sources 240V AC; DC supplies; EHT voltages. Someone electrocuted and still attached to a supply is still `live'.
The amount of current passed through the body is determined by the points of contact, the voltage applied and the skin condition (moist or dry). Skin resistance may vary from under 1000 ohms for wet skin to 500Kohms for dry skin.

7. Dismantle & Assemble a PC Risk Assessment & Safety factors
Main Hazards ?
Electrical
ESD – Electrostatic Discharge
Sharp Edges
Beware of sharp edges inside PC Cases and the small solder pins on boards. A harmless-looking case edge can be as sharp as a razor, and remove large chunks of flesh if accidentally nudged with a slipping hand.
The primary cause of injury or death is the passage of electric current through the body. Consequential injury, possibly severe, can result from violent muscle reaction to the current.
The current can be supplied from a number of different sources 240V AC; DC supplies; EHT voltages. Someone electrocuted and still attached to a supply is still `live'.
The amount of current passed through the body is determined by the points of contact, the voltage applied and the skin condition (moist or dry). Skin resistance may vary from under 1000 ohms for wet skin to 500Kohms for dry skin.

8. Dismantle & Assemble a PC Risk Assessment & Safety factors
Main Hazards ?
Electrical
ESD – Electrostatic Discharge
Sharp Edges
Manual Handling
PC devices/peripherals are generally very delicate in nature. Handle them with extreme care and always employ some method to disperse static electricity.
The primary cause of injury or death is the passage of electric current through the body. Consequential injury, possibly severe, can result from violent muscle reaction to the current.
The current can be supplied from a number of different sources 240V AC; DC supplies; EHT voltages. Someone electrocuted and still attached to a supply is still `live'.
The amount of current passed through the body is determined by the points of contact, the voltage applied and the skin condition (moist or dry). Skin resistance may vary from under 1000 ohms for wet skin to 500Kohms for dry skin.

9. Dismantle & Assemble a PC Risk Assessment & Safety factors
Manual Handling
PC devices/peripherals are generally very delicate in nature. Handle them with extreme care and always employ some method to disperse static electricity.
Can I lift it?  - Is it stable?  - Are there any sharp edges?
Have I any injuries that could impede my lifting?
Is the floor untidy or too slippery?
The primary cause of injury or death is the passage of electric current through the body. Consequential injury, possibly severe, can result from violent muscle reaction to the current.
The current can be supplied from a number of different sources 240V AC; DC supplies; EHT voltages. Someone electrocuted and still attached to a supply is still `live'.
The amount of current passed through the body is determined by the points of contact, the voltage applied and the skin condition (moist or dry). Skin resistance may vary from under 1000 ohms for wet skin to 500Kohms for dry skin.

11. Toolkit

12. Common Installation Problems
Damaged Parts
Wrong Parts
Software Issues
Interface cards Not Seated
Loose Connectors
Parts not connected correctly.

13. Handling of Components
Hard disk
Do not drop or Bang
Do not expose to water / liquid
Do not take apart
Expansion cards
Try not to touch the copper track
Try not to touch the components
Ram
Take ESD measures
Do nor force into slots
Do not bend the modules

14. Computer Repair & Maintenance