Printers & Multifunction Devices
Key Takeaways
- Laser printers follow the 7-step imaging process — Processing, Charging, Exposing, Developing, Transferring, Fusing, Cleaning — and are best for high-volume text.
- Inkjet printers spray liquid ink through nozzles; they excel at photos but cost more per page and clog if idle.
- Thermal printers heat chemically treated paper and need no ink or toner — used for receipts, labels, and wristbands.
- Impact (dot-matrix) printers are the ONLY type that can print multi-part carbon forms because they physically strike the page.
- 3D printers build objects additively using filament (FDM), liquid resin (SLA), or fused powder (SLS).
Printer Technologies
Laser Printer — the 7-Step Imaging Process
Laser printers use dry toner and electrostatic charge to produce sharp, low-cost-per-page text output. The imaging process is one of the single most-tested memorization items in Domain 3, and PBQs ask you to order the steps.
| Step | Name | What Happens |
|---|---|---|
| 1 | Processing | The printer rasterizes the page in memory (RIP) into a bitmap |
| 2 | Charging | A primary charge roller (or corona wire) applies a uniform ~−600V charge to the imaging drum |
| 3 | Exposing | The laser writes the image, neutralizing charge where toner should stick |
| 4 | Developing | Negatively charged toner is attracted to the exposed (neutralized) areas |
| 5 | Transferring | A positive transfer charge pulls toner from the drum onto the paper |
| 6 | Fusing | Heated rollers (~180–200°C / ~400°F) melt and bond toner permanently |
| 7 | Cleaning | A wiper blade clears residual toner; an erase lamp removes leftover charge |
Memory Aid: "People Can Easily Detect Toner Fluff Clearly." Note the page is warm coming out because of the fuser — that is normal, not a fault.
Laser maintenance kit & symptoms:
- Faded/light print → low toner; remove and gently rock the cartridge
- Repeating ghost images/spots → worn drum (replace) at a fixed interval
- Vertical white streaks → dirty corona wire or clog in the toner path
- Toner smears/rubs off → failed fuser (replace fuser assembly)
- Speckled background → worn drum or overfilled toner
Inkjet Printer
| Feature | Detail |
|---|---|
| Technology | Thermal or piezoelectric spray of liquid ink through nozzles |
| Quality | Excellent photo/color (up to 9600 x 2400 DPI) |
| Cost per page | Higher than laser, especially color |
| Maintenance | Head cleaning, cartridge replacement, calibration/alignment |
| Best for | Home use, photos, low-volume color |
Inkjet symptoms: lines/bands across prints → clogged nozzles (run cleaning cycle); misaligned colors → run print-head alignment; smearing → wrong paper or handling wet pages; streaky output → dried ink from sitting idle.
Thermal Printer
| Feature | Detail |
|---|---|
| Technology | Heated print head darkens chemically treated paper |
| Consumable | Thermal paper only — NO ink, toner, or ribbon |
| Durability | Prints fade with heat/light over time |
| Maintenance | Clean the heating element; replace paper roll |
| Use cases | Receipts, shipping/barcode labels, medical wristbands |
Impact Printer (Dot Matrix)
| Feature | Detail |
|---|---|
| Technology | A print head of pins strikes an inked ribbon against the paper |
| Quality / noise | Low (draft text); very loud |
| Consumables | Ribbon + tractor-feed continuous paper |
| Unique ability | Prints multi-part carbon-copy forms in one pass |
| Use cases | Invoices, packing slips, shipping manifests |
Because impact is the only mechanism that physically presses through layered carbon forms, it survives in warehouses and auto shops. Symptoms: faded print → worn ribbon (replace); consistent missing dots/lines in characters → broken print-head pins (replace head).
3D Printer
| Technology | Method | Material |
|---|---|---|
| FDM (Fused Deposition Modeling) | Extrudes heated filament layer by layer | PLA, ABS, PETG |
| SLA (Stereolithography) | UV laser cures liquid resin | Photopolymer resin |
| SLS (Selective Laser Sintering) | Laser fuses powder | Nylon/polyamide powder |
Filaments: PLA is biodegradable and low-warp (most popular); ABS is stronger and heat-resistant but needs a heated bed and ventilation; PETG is food-safe and chemical-resistant.
Printer Connectivity & Sharing
| Method | Description |
|---|---|
| USB | Direct, one host (USB-B at printer, USB-A at PC) |
| Ethernet (RJ-45) | Network printer shared by all devices |
| Wi-Fi / Wi-Fi Direct | Wireless network or peer-to-peer (no AP) |
| Bluetooth | Short-range mobile printing |
| Cloud / print server | Centralized queue managed for the network |
Sharing vs. networked: A shared printer is attached to one host PC that must be powered on; a networked printer has its own IP/NIC and is independent of any single PC. Print to a networked unit using its IP or hostname.
Installation & Configuration
- Unbox, remove packing tape/locks; install toner/ink and load paper.
- Connect by USB or network (assign a static IP or DHCP reservation for network units).
- Install the correct driver (and the right PDL — PCL or PostScript) on each client or via a print server.
- Set defaults: duplex, paper size/tray, color vs. grayscale, collation.
- Configure security: secured/follow-me print, user authentication, and audit logging where required.
- Print a test page and calibrate to verify.
Spooler tip: A stuck queue is a top help-desk call. Stop the Print Spooler service, delete the files in C:\Windows\System32\spool\PRINTERS, then restart the spooler.
Page Description Languages & Drivers
The PDL tells the printer how to render a page. PCL (Printer Command Language) is fast and common for office text; PostScript (PS) is preferred for graphics and exact color in design and print shops. Installing the wrong PDL driver produces garbage characters or pages of raw code, so match the driver to the printer model and the PDL it expects.
Security & Cost Controls
- Secured / follow-me print: the job holds in a server queue until the user authenticates at the device with a badge or PIN, preventing sensitive documents from sitting in the output tray.
- User authentication and audit logging: track who printed what for compliance.
- Duplex and grayscale defaults: cut paper and toner cost on shared fleets.
- Hard-drive sanitization: many multifunction devices store scanned and printed images on an internal disk, so wipe or remove that disk before disposal.
Arrange the laser printing imaging steps in the correct order:
Arrange the items in the correct order
An office needs to print three-part carbon-copy shipping forms in a single pass. Which printer technology is required?
Pages from a laser printer come out with toner that smears and rubs off when touched. Which component should the technician replace?
A receipt printer at a retail register has run out of supplies. Which consumable does it require?