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9. Thermal Head Drive: SS950
9-1. Function / Specification
Thermal head
.
Memory length
256mm (B4)
.
Number of thermal heating elements
4096 dots
Density of thermal heating elements
16 dots/mm
Element Size
45~m x 45~m
.
Applied Voltage
24V
9-2. Power lines
VCC/VHD/GND
.... Applied voltage
VHD: As the resistance of the thermal elements varies depending
on the thermal head, it
is necessary
to adjust the applied voltage according
to the average resistance
of
the thermal head.
The thermal rating of each head is documented
on the thermal head cover. There-
fore, after installing a new thermal head, always recalibrate the power supply unit
according
to the VHD ratings on the thermal head cover. Adjust VHD using VR1
on the
power supply unit.
The drive circuit (LSIC) consists of the following:
32 x 128-bit shift registers, 32 x 128-bit
latches, logic gates, drive transistors,
and 4096 heating elements. The thermal head is
made up of 32 drive circuits arranged in two rows of 16 elements.
2-20
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