Guides

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

Product photo of the Zebra TC22, Honeywell CT32, and M3 Mobile SL20 industrial PDAs

GuidesOct 2, 2026

When to replace an industrial PDA battery: judging by the status menu and charging LED

Time PDA battery replacement by charging LED and battery status: TC22 Battery Manager, charging errors, contact cleaning, and CT32 and SL20 hot swap.

Zebra GK420t, TSC TE210, and Zebra ZT411 label printers

GuidesOct 2, 2026

Label printer self-check before service: printing a configuration label and reading the status lights

Before sending a label printer for service, read the status light and print a configuration label: Zebra and TSC steps, light signals, and what to prepare.

A Zebra ZD421 desktop printer and a Zebra GK420t printer with a label coming out

GuidesOct 2, 2026

When to replace a label printer platen roller: slipping and sticking symptoms, and how to remove and clean it

Replace the platen roller by symptom, not schedule: slipping or sticking after cleaning, ZD421/GK420t removal, roller colors, and linerless roller care.

Product photo of the Zebra DS2278 cordless scanner and the Honeywell Voyager XP 1472g cordless scanner

GuidesOct 2, 2026

Wireless barcode scanner Bluetooth disconnections and pairing errors: finding the cause by the beep

Check distance, reconnect settings, pairing partner, and battery: DS2278 and Xenon XP 1952g beep meanings, reconnect timeouts, and cradle re-pairing steps.

Product photos of a Zebra DS2208 corded scanner and a Honeywell Xenon XP 1950g corded scanner

GuidesOct 2, 2026

Barcode scanner USB HID vs. virtual COM vs. RS-232, and how to switch with setting bar codes

Use a scanner as a USB keyboard (HID), USB virtual COM, or RS-232: DS2208 and Xenon XP 1950g setting bar codes, driver order, and default baud rates.

Product photos of a Zebra ZD421 desktop printer and a GoDEX G500 printer with a label coming out

GuidesOct 2, 2026

Fixing label printer driver installation errors: checking the spooler, port, and Device Manager

Label printer driver errors: USB plugged in first, a stopped spooler, wrong driver or port. Zebra install order, Unspecified device fix, Codes 28 and 52.

Product photo of a Zebra ZT231 industrial printer and a wired Ethernet module for the ZD421

GuidesOct 2, 2026

Zebra printer network (IP) setup: assigning a static IP address and checking the Windows connection

Zebra printers ship on DHCP, so printing stops if the IP changes. Set a PERMANENT IP on the ZT411, ZT231, ZD621, or ZD421 and update the Windows port.

Product photo of a Zebra ZD621 desktop printer and a TSC MH241 industrial printer with labels coming out

GuidesOct 2, 2026

How to calibrate the label sensor: button combinations and menus for Zebra, TSC, Godex, and Bixolon

Calibrate the media sensor when labels skip or drift: gap, black mark, and continuous media, ZD421 PAUSE+CANCEL, ZT411 menus, TSC LEDs, Godex, Bixolon.

Product photo of a Zebra ZT421 industrial printer and a TSC TTP-247 printer with a label coming out

GuidesOct 2, 2026

When to replace a printhead: judging by missing dots in the self-test and usage distance

Replace a printhead when blank dots remain after cleaning and fall within the label width. ZT411/TE210/MH241/G500 dot checks, ZD421 usage, TPH Care.

Product photo of a Bixolon XD5-40t desktop thermal transfer printer and a Wooju OA W-220 wax ribbon roll

GuidesOct 2, 2026

Thermal transfer ribbon wrinkles: causes and fixes, checking tension, printhead pressure, and media path in order

Ribbon wrinkles come from loading, darkness, pressure balance, media drift, and tension. Read the wrinkle direction, then adjust one step at a time.

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.