Tally T6218, Maintenance Manual Supplement

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Technical Overview
P/N 1149-084775 Tally Printer Corp. 7
Supplement to Chapter 1: Technical Overview
New Features
On-the-Fly Coil Temperature Measurement for the T6218
The T6218 design includes an improved mechanism to directly monitor each impact hammer’s
thermal state to ensure that overheating damage will not occur.
Hardware design limitations of earlier model Tally printers meant a rather unsophisticated
thermal sense technique had to be employed. This was done by estimating the thermal state
based on average frequency of hammer triggering. The drawback of this averaging technique is
that printing throughput becomes prematurely reduced during many high-density printing
scenarios. Thus, optimum throughput would fail to be achieved.
The T6218 hardware design, coupled with a scanning software algorithm, now allows for direct
thermal sensing of each impact hammer. Thus, a precise thermal profile can be continuously
maintained in real-time while printing. This allows the T6218 hammers to be safely operated at
maximum rate right to their maximum safe operating limit. Thus, the T6218 printer will safely
maintain optimum printing speed without risk of damage.
Automatic Paper Motion Fault Retry
A new feature has been added that can eliminate intermittent false paper motion faults. When a
paper motion fault is detected while printing is in progress, the paper is reversed approximately 3
inches, then moved forward again. If the paper motion fault persists, the printer is placed offline
and the fault is reported.
This feature can eliminate false paper motion faults caused by random electrical noise or paper
chads/dust that can be removed by the paper reversal.