Laser Printers:

The ozone filter needs to be replaced on laser printers when performing preventative maintenence.

For dark spots on a page with a laser printer, it indicates loose toner particles. Running extra paper through will usually resolve it.

The order of processes in a laser printer is:

1) Cleaning

2) Conditioning

3) Writing

4) Developing

5) Transferring

6) Fusing

The primary corona has the highest negative charge in a printer.

Always check where the leading edge of paper is when troubleshooting paper jams, because it can indicate which printer part is causing the jam.

The photoconductive drum in a laser printer is charged negatively, and loses its charge when light hits it.

The transfer corona can cause the print to be too light.

Dot Matrix:

A tight ribbon can cause flecks and smudges on the paper.

Missing or proken printhead pins causes incomplete characters.

Never lubricate the printhead on a printer.

If the print density is erratic, then there is probably an error with the ribbon advance.

Printers:

A parallel cable has a 25 pin connector that interfaces with a computer and a 36 pin connector that interfaces with the printer.

The standard connections for a printer are serial and parallel cable. A stand alone printer may also have a network card.

Toner is a fine powder made up of plastic bonded to iron particles.

Fonts typically reside in the printers EPROM (Electrically Programmable Read Only Memory). Raster fonts are stored as bitmaps, vector fonts are defined as a set of lines and points, true type fonts are outline fonts.

Hardware Topics: Basic PC Overview
Preventative Maintenance and Safety -|- Basic Troubleshooting -|- PC Architecture Basics -|- PC I/O and Busses
Processors -|- Memory -|- Drives -|- Monitors and Video -|- Modems -|- Printers -|- Portable Systems -|- Networking

Operating System Topics:
DOS basics -|- Windows 3.1 -|- OS Memory Management -|- Installation of DOS and Windows 3.x
Installation of Windows 9X -|- Diagnosis and Troubleshooting -|- Windows 95 Overview -|- Windows 95 Networking
Windows 95 vs Windows NT

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Please Read -DISCLAIMER: Technology changes very rapidly. The information presented here was believed to be accurate at the time it was gathered. No claim is made that this information is up to date, or that it represents the current technology used today.

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