When white-ink output changes, first save a nozzle test and record the machine state. Confirm the approved ink, storage, circulation or agitation, pressure status, ink path and environment in the order specified for that printer. Do not substitute generic pressure values, fluids or cleaning cycles.
Last updated: 23 September 2026 · Author: SUNUSER application team · Always follow the signed configuration and model-specific manual.
Collect evidence before changing settings
Nozzle evidence
Save a labelled nozzle test before cleaning and after each approved action. Note whether loss is isolated, repeating, intermittent or across the whole white channel.
Ink evidence
Record ink product, batch, opening date, storage conditions, remaining level, visible separation and any recent refill or changeover.
Machine evidence
Record alarms, pressure status, circulation or agitation state, filter history, idle time, environment and the last successful print.
Use a fixed diagnostic order
Verify that ink and maintenance fluid match the signed configuration. Stop if identity or compatibility is uncertain.
Check for leaks, loose lines, damaged dampers or filters, unusual colour, air gaps and visible contamination without dismantling unapproved components.
Confirm that the model’s white-ink management functions operate as intended. Use only the approved schedule and procedure.
Review the model-specific pressure, ink level, temperature, filter and cap or wiper condition. Do not copy values from another printer.
Use the least invasive approved action, print another nozzle test, and compare. Changing several variables at once removes useful diagnostic evidence.
Symptom-to-check sequence
- White density gradually weakens
- Review nozzle trend, ink age and batch, circulation or agitation, pressure stability, filter condition and the actual print construction.
- Missing nozzles return and disappear
- Check air ingress, cap seal, wiper contamination, pressure fluctuation, ink path and environment before repeating cleaning.
- One white channel behaves differently
- Compare channel-specific dampers, lines, filters, pressure indications and nozzle tests; retain photos for technical support.
- White ink appears yellow or contaminated
- Stop and check material identity, mixing, maintenance fluid, light and heat exposure, varnish interaction and storage history.
Send a useful support packet
- printer model, serial number and signed ink configuration;
- before-and-after nozzle tests with time labels;
- ink and fluid product, batch and opening date;
- alarm text, pressure display, circulation state and maintenance history;
- clear photos or continuous video of the symptom and approved checks.
White ink maintenance FAQ
Why does UV white ink need more process control?
White ink contains a high pigment load. Storage, circulation, agitation, temperature, filtration, pressure and idle time can all affect delivery, but the correct procedure is model- and ink-specific.
Should an operator keep cleaning until every nozzle returns?
No. Repeated cleaning without diagnosing the cause can waste ink and may not solve pressure, air, contamination or hardware problems. Follow the approved troubleshooting path.
Can different white inks be mixed?
Do not mix inks or maintenance fluids unless the printer and ink supplier explicitly approve compatibility and the changeover procedure.
What records help technical support?
Keep the nozzle test, alarm text, ink batch, maintenance actions, environment, idle time and clear photos or video before changing multiple variables.