Wooju OA

Guides

Practical guides on choosing, setting up and maintaining barcode printers and scanners, written by the Wooju OA service team in Korea.

Zebra ZT411 and ZT421 industrial barcode printers side by side

GuidesSep 26, 2026

ZT411 vs. ZT421: do you need a 104 mm or a 168 mm print width?

If the print area exceeds 104 mm, choose the ZT421; if it fits within 104 mm, the ZT411. Labels under 51 mm and 600 dpi point to the ZT411.

A printhead cleaning pen and the inside of a TSC MH241 industrial printer with the cover open

GuidesSep 26, 2026

How and how often to clean a barcode printer printhead, step by step with 99% alcohol

Clean the printhead and platen roller with 99%+ IPA at each new roll: intervals, supplies, 7 steps, and mistakes for Zebra ZT411/ZT421 and TSC TTP-247/MH241.

A Zebra ZT411 printer with the cover open and labels loaded, and a Wooju OA W-220 wax ribbon roll

GuidesSep 26, 2026

Label print quality troubleshooting: checks by cause for faint print, white lines, smudging, and scan failures

For faint print, white lines, or smudging, check printhead dirt, darkness and speed, ribbon-label match, then head pressure. Self-tests and quiet zones..

Actual product photo of a direct thermal label roll, a synthetic label roll, and an art paper label roll side by side

GuidesSep 26, 2026

Types of barcode label paper: direct thermal, art paper, and synthetic, and their ribbon pairings

Label media is direct thermal paper or ribbon-fed thermal transfer media. We compare ribbon pairings, Goodlabel counts per roll, and roll specs by printer.

Product photo of the Zebra TC22, Honeywell CT32, and i.safe MOBILE IS540.1 industrial PDAs

GuidesSep 26, 2026

How to choose an industrial PDA: input type, connectivity, scan range, and environment

Choose an industrial PDA by form, Wi-Fi or cellular, scan range, and cold or hazardous use. We compare 7 Zebra, Honeywell, M3, Point Mobile, i.safe models.

A roll of Goodlabel synthetic labels printed with barcodes and a Zebra DS3678 barcode scanner

GuidesSep 26, 2026

GS1 barcode basics in Korea, from GTIN issuance to barcode printing rules

Products for Korean supermarkets and convenience stores need a GTIN from GS1 Korea. Barcode uses, brand owners, RCN, new-GTIN changes, and print rules.

Zebra ZD421 desktop, ZT411 industrial, and ZQ320 mobile barcode printers

GuidesSep 26, 2026

Barcode printer types: how to choose desktop, industrial, mobile, or print engine

Barcode printers come in 4 types: desktop, industrial, mobile, and applicator print engines. Compare roll OD, weight, speed, and connectivity by model.

Product photo of a Zebra DS3678 wireless scanner, Zebra DS4608 corded scanner, and Honeywell Granit 1910i scanner

GuidesSep 26, 2026

Types of barcode scanners: how to choose between 1D, 2D, wireless, and industrial

Phone QR or Data Matrix needs a 2D area imager; 1D-only reading needs a linear imager. Compare working range, wireless range, battery, drop and IP rating.

Wooju OA wax, wax/resin, and resin thermal transfer ribbon rolls lined up by grade

GuidesSep 26, 2026

Thermal transfer ribbon types: wax, wax/resin, and resin differences and how to choose

Wax ribbons for paper labels, wax/resin for coated and matte synthetic, resin for chemical, heat, or outdoor synthetics. Uses, widths, and ink-side checks.

A Zebra ZT411 industrial barcode printer and a roll of Goodlabel synthetic labels printed with barcodes

GuidesSep 26, 2026

203 dpi vs 300 dpi: choosing by barcode bar width and print speed

At 203 dpi, EAN-13 meets spec at 113.64% and GS1-128 at 4 dots (0.500 mm). Bars under 0.125 mm or EAN-13 near 100% need 300 dpi, at lower speed and length.

A roll of direct thermal labels next to a Wooju OA wax ribbon roll

GuidesSep 26, 2026

Direct thermal vs thermal transfer: choosing by label lifespan and storage conditions

Labels used 1 week to 1 year, such as shipping labels and receipts, suit ribbonless direct thermal; labels kept for years suit thermal transfer.