Star Micronics MP111MP-24G-A - Manual (Page 19)

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(2) Pre-fire
This operation applies minute vibrations to the needle wire to allow for its smooth movement as printer warmup.
Pre-fire is performed under the following conditions. The energizing time is too short to allow for the printing
action to occur.
Operating time When power is turned ON. Number of times 32 Times
Frequency 900 Hz Power supply voltage DC24V
±
2.4 V
Energizing time 175
±
5
µ
s
(3) Print Duty
This print head is not equipped with a head temperature detector. Therefore, use the printer within the maxi-
mum printing ratio shown below. If you print exceeding this printing ratio, you can damage the printer.
Fig. 3-12 Print duty
The figure above shows the print duty that is possible with continuous printing when each wire is used an
equivalent number of times. In this case, you can calculate the possible dot count for D per character using the
following numerical formula.
N (Print Ratio) x T (Print time per line includes the time of the paper feed [sec])
L (number of character per line)
[dot/chara]
1140
830
21.6 V 24.0 V 26.4 V
Ambient Temperature 25 ° C
Ambient Temperature 50 ° C
Print Ratio N
(dot /sec)