Gain and advanced understanding of computer repair - servicing - troubleshooting

The final module in the computer servicing courses, computer servicing 3 will give you the final bits and pieces you will need to apply your skills in in real life and gives information on other areas of IT that you may want to expand your learning into.


Why choose this course?

If you already have a good knowledge of computers and servicing them, this course will take your knowledge to the next level for repairs, servicing and troubleshooting hardware and software related issues.

Would this course suit me?

This course goes into advanced computer repair and would suit you if you were entering a career in IT repair work. If you wish to fix your own computer this course is would be very helpful teaching you the hardware components within a system.

Advanced computer knowledge 


9 lessons filled with easy to understand instructions

Screenshots of working examples

100 hours total study with up to 12 months to complete

No classes, submission dates or schedules!


Develop your ability to independently undertake repair of hardware and software faults in personal computers.

This course builds on our Computer Servicing I and II courses; expanding your knowledge, particularly with peripherals and networking: all of the "add on" bits that go with a computer

  • Start studying any time
  • Great support from our team of university trained and industry experienced IT professionals
  • Offices open to support you 5 days a week, 50 weeks a year, in both Australia and the UK
  • ACS has been training people around the world since 1979

* We advise you to complete Computer Servicing II (or equivalent) before undertaking this course



There are 9 lessons in total, as outlined below:


1. Removable storage

2. Electronics

3. Audio systems

4. Video systems

5. Laptops and other portable devices

6. Diagnosis and regular maintenance

7. Networking - an introduction

8. The Internet

9. Printers



  • Compare alternative solutions to different types of faults determined in PC computer systems
  • Repair hardware faults determined in PC computer systems
  • Repair software faults determined in PC computer systems
  • Install hardware components in a computer
  • Some of what you will learn to do in this course:
  • Explain how to repair a range of hardware faults determined to be common.
  • Repair an inoperable printer cable for a computer
  • Delete unwanted files from an operating system (eg. DOS)
  • Explain how to repair a range of software faults determined to be common.
  • Delete unwanted files from an operating system (eg. DOS)
  • Recommend appropriate hardware for different applications
  • Explain how to replace a faulty power supply.
  • Explain how to replace a mother board.
  • Describe the installation of extra ram
  • Install an extra HDD to work in conjunction with the existing HDD



The Bandwidth of a network is measured in bits per seconds (bits/sec) and represents the maximum amount of data that can flow over a transmission medium. If a medium has a high bandwidth, this means that this medium can pass high amounts of data, and thus has high capacity. However, if a medium has low bandwidth, it means that it has limited capacity.

Since the bandwidth is measured in terms of bits transmitted per second (abbreviated as bps), different transmission media can transmit at specific bps rates. Some examples for Ethernet networks are as follows:

• Ethernet LAN transmits at 10 megabits per second (Mbps), which is equivalent to 10 million bits per second,
• Fast Ethernet transmits at 100 Mbps, equivalent to 100 million bits per second,
• Gigabit Ethernet transmits at 1Gbps or 1 billion bits per second,
• 10 Gigabit Ethernet transmits at 10 Gbps, or 10 billion bits per second.

The bandwidth for a cable varies according to the cable’s length. Theoretically, a short cable has greater bandwidth, whereas a longer cable would accommodate for less bandwidth. This explains why all cables generally contain maximum length specifications, as going beyond the specified limits would incur major distortions to the signals, which would cause errors in the data signals.


Band Use

The capacity of a transmission medium can be allocated by baseband and broadband transmissions. In a baseband transmission, a single signal would consume the entire bandwidth of the medium, whereas in a broadband transmission, it is possible to transmit various signals over the same transmission medium, simply by using multiple frequencies to transmit the signals.

It is to note that most Local Area Networks (LANs) use baseband mode for data transmission, and that baseband signalling can be used with analog and digital signals.

E.g. Frequency-division multiplexing (FDM) is a method of dividing bandwidth into different frequencies in order to carry different signals simultaneously. A broadband cable can supply both internet services and TV on the same cable. This is because each of the two signals can be assigned different frequencies. By choosing the appropriate frequency, you can use the television tuner to tune in to the TV station you want

TDM (time-division multiplexing) is another method used to support digital signals.



Multiplexing can be used to enable broadband media to support multiple data channels.

  • Multiplexing is appropriate in several situations, including:
    If bandwidth is idle. Many organizations have installed fiber-optic cable that is used only to partial capacity. With the proper equipment, a single fiber can support hundreds of megabits—or even a gigabit or more—of data.
  • If significant quantities of data needs to be moved along low-capacity channels. Multiplexing can divide the original data stream into a number of lower-bandwidth channels, each being transmitted through lower-capacity media. Signals can then recombine at the receiving end.
  • If media bandwidth is expensive. High-speed rented lines (eg T1 or T3), can be expensive to lease. When a leased line has sufficient bandwidth, multiplexing may allow the same line to carry various other data types (eg. mainframe, LAN, voice, video conferencing)
  • “Multiplexing” combines multiple data channels for transmission on a common medium.
  • “Demultiplexing” recovers the original separate channels from a multiplexed signal.
  • Multiplexing and demultiplexing are performed by a multiplexor (also called a mux), which usually has both capabilities.



As a signal travels though a given medium, it will start to lose intensity, due to reduction in the energy of that signal transmission. This reduction is measured by the “Attenuation” of the signal, and has a direct impact on the transmission performance.

When specifying cabling, you should always indicate the length of a cable run in order to avoid attenuation problems. If the strength of a signal drops too low, the equipment that receives the signal will start to have problems distinguishing between the signal and “noise” or “interference”.

Take your computer knowledge to the next level....

Now that you have the basics covered in computer servicing 1 and 2, you will have the ability to move into other areas that will not only benefit you but you will be able to assist others with their computer issues. 

  • Logical and straight forward this course gives the student even more knowledge on how to service and repair computer issues.
  • Empowering yourself with this knowledge give you a solid foundation to be able to move into other areas of IT and take on more advanced topics such as networking, programming, databases and more...

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Using our modern online portal for study is a simple and effective way of learning.

Once enrolled, you will receive your online account to our system that will give you all the lessons assignments and self-assessment tests so you can start studying straight away.

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