Rev. A Mechanism Configuration and Operating Principles 2-45
TM-U950/U950P Technical Manual
Auto-cutter drive circuit
The auto-cutter drive circuit uses the dedicated DC motor drive IC TA8428K. The CPU issues
the AC_1 and AC_2 signals to control off, normal, reverse, and braking operations of the auto-
cutter motor.
Carriage motor drive circuit
The carriage motor is driven by a dedicated constant-current IC. The CPU issues the mutual
switching signals CR_1 and CR_2 and the constant-current switching signals CR_HL and
CR_NM. In response to these signals, the IC controls the carriage motor via the OUTA, OUTA
,
OUTB, and OUTB
terminals.
AC_1 AC_2 Operation
LLOff
H L Normal
LHReverse
H H Brake
CR_HL CR_NM Operation
0 0 Speed up / slow down
0 1 Normal rotation
10 Hold
Figure 2-57. Auto-cutter Drive Circuit
CONFIDENTIAL
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