Ink Starvation at Higher Speeds
medium
ink-delivery
density
Density fades only at fast modes/long swaths from restricted flow (not a clog).
Likely Causes
Aged/partially blocked dampers or inline filters: Flow restriction at high draw.
Excess vacuum / pump imbalance: Starves channel during long scans.
Supply bottle venting poor: Negative pressure builds, reducing feed.
Quick Checks
- Repeat test at one speed lower; compare density.
- Check line purges; confirm dampers/filters age.
Step-by-Step Fix
Replace aged dampers/filters — Restores flow at high draw
Reduce speed or increase passes — Lowers instantaneous demand
Acceptance Criteria
- No density fade on a 24" full-bleed at target speed