Seoul, Korea · Since 1995

Barcode printers, scanners and service in Korea

Wooju OA supplies, installs and repairs barcode equipment for logistics, manufacturing and retail sites in Korea, from label printers to mobile computers.

Products info@woojuoa.co.kr

Founded: 1995, Seoul
Zebra: Business Partner
Brands: Zebra, Honeywell, TSC, Bixolon
Service: Supply, installation, repair

Products

Brands we supply and service

Zebra · Honeywell · TSC · Bixolon · Godex · Mozgear · PointMobile · Datalogic

Guides

All guides

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..