SECTION 4 - TECHNICAL INFORMATION
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SmartDate 5 08/08
4.7.5 Ribbon Calibration / Movement Roller
The ribbon movement roller has a high friction coating and houses a 16 pole
magnet which is located into a Hall effect sensor when the cassette is interlocked
with the printer body.
As the roller and magnet rotate, the magnetic field strength varies.
Data is gathered by the Hall effect sensor and analysed by the processor.
This used to control the ribbon drive.
Information such as ribbon breaks or remaining length of ribbon are controlled
from this data.
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