The following points summarize the key concepts in this chapter:
- The three most commonly encountered types of printers are dot-matrix, ink-jet, and laser printers.
- As a computer technician, you can expect to encounter printing problems on a regular basis.
- Most printer problems can be resolved quickly by checking for paper jams, expended consumables, or improper use.
- The key components of a laser printer are its power supply, photosensitive drum, eraser lamp, primary corona, laser, transfer corona, and fuser.
- Modems convert parallel digital data to and from serial analog data.
- Modem speeds are based on bps (bits per second).
- CCITT (now ITU-T) establishes standards for modem communication.
- AT commands are used to manually communicate with and test a modem.
- Modems can be installed internally or externally.
- The primary modem problem is IRQ conflicts.
Cables and Connectors
- There are many different types of computer cables and connectors. It is important for the computer technician to be able to identify each of them.
- Distinguishing between a male or a female connector is often the key to identifying the connector's function.
- Loose or poorly connected cables are often the cause of computer problems.