Abnormal blanket tension on a Heidelberg Speedmaster CD102 can contribute to registration drift, pressure variation, slur or local print defects. Start by documenting when the drift appears and whether it follows a cylinder, blanket or paper condition. Stop and isolate the press before inspection. Check blanket tension and clamping, confirm underpacking thickness, inspect the blanket surface and verify cylinder bearer clearance against the machine specification. Then run a controlled test and compare registration marks. Do not compensate for a mechanical problem by simply increasing pressure; record each adjustment and involve a qualified technician when measurements exceed the manual's limits.
Images above are generated/schematic illustrations for inspection scenarios, not actual customer sites.
Diagnostic sequence
- Record registration drift by color, direction, speed and paper condition.
- Inspect blanket clamping, tension uniformity and underpacking.
- Measure relevant cylinder clearances and compare them with the CD102 specification.
- Make one controlled adjustment at a time and retain the test sheets and measurements.
