Applicable Systems
MAN Roland Offset Printing Machine
Symptoms
The MAN Roland press displays error MR012, indicating a paper path sensor fault. One or more sensors along the paper path are not detecting the sheet correctly, causing false jam alarms or missed sheets.
Possible Causes
- Optical sensor lens contaminated with ink mist or paper dust
- Ultrasonic sensor misaligned, causing incorrect sheet presence readings
- Sensor cable or connector damaged from repeated motion or vibration
Troubleshooting Steps
- Step 1: Clean all optical sensor lenses with a lint-free cloth and alcohol
Lenses are clean and the sensor LED indicators show correct state - Step 2: Check ultrasonic sensor alignment with a straightedge
Sensor is perpendicular to the paper path and the gap matches the specification - Step 3: Test sensor wiring continuity and connector security
All wires show continuity and connectors are locked with no visible damage
How to Reset
To reset: 1) Clean or replace contaminated sensors. 2) Realign ultrasonic sensors. 3) Repair damaged wiring. 4) Press RESET and run a sheet path test.
Source: MAN Roland Offset Printing Machine Manual, manroland AG
Category: Printing