TallyGenicom 6306, Maintenance Manual

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6300 Series Maintenance Manual
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1.3.5.2 Paper Motion
The Paper Motion sensor monitors the motion of paper through the tractors by looking for the
passage of paper sprocket holes. The sensor is located on the upper left paper tractor. If no paper
is present in this tractor, or if paper is present in the tractor but is not moving, a fault is generated.
Paper Motion fault results in an “off line” condition.
A proprietary adaptive fuzzy logic algorithm is used in order to provide accurate sensing over a
variety of forms. This algorithm is also designed to be tolerant of paper dust build-up.
1.3.5.3 Shuttle
The Shuttle sensor monitors the amplitude and position of the shuttle while printing. If the shuttle
fails to stay within the expected range, it is stopped and a shuttle fault is announced. If the shuttle
fails during ramp-up a shuttle fault is
signaled. A shuttle fault results in an “off line” condition
with printing suspended.
1.3.5.4 Temperature
The hardware design, coupled with a scanning software algorithm, allows for direct thermal
sensing on every print hammer coil. When a coil temperature is detected to be within a thermal
alert range the rate of printing is slowed by forcing additional shuttle cycles to occur for each row
of print. When all hammer coil temperatures fall below the alert range, optimal print speed is
restored.
1.3.5.5 Ribbon Fault Detect (6306 and 6312)
The ribbon fault detect system senses the motion of the ribbon by monitoring a spinning thin steel
disk inside the ribbon cartridge. This disk turns as the ribbon is driven through the hammer bank.
A ribbon fault will occur if the ribbon either breaks, jams, or is not installed. A ribbon fault
results in an “offline” condition. (Note that this sensor also has black and silver regions and can
thus be detected optically. This makes it compatible with earlier generation printers.)
1.3.5.6 Ribbon Skip Over Weld (6312 only)
On re-inking ribbons the ribbon platform incorporates and optical sensor that detects when the
weld in the ribbon fabric is about to enter the print line. Printing is momentarily halted while the
weld passes through the print line. This feature greatly increases the life of the ribbon, which is
usually limited by the life of the fabric weld. It also eliminates the possibility of characters being
poorly printed as a result of printing directly on the fabric weld.