REV.-A
2.3.5
Paper Advance Motor Drive Circuit
The printer uses a stepping motor to advance the paper. The minimum amount the
printer
can advance
paper is 1/360 inch. The motor is a 2-2 or 1-2 phase, constant-voltage drive motor.
p70
to
P73
in the
CPU are the control ports for the stepping motor. Paper advance motor phase data is output through
these ports.
PFB
to
PFD
are turned on and off in the PU 1501 according to the phase data the CPU sends.
When the paper advance motor is running, the voltage supplying the coil of the paper advance motor
is +35 V. When the paper advance motor is not running and is in hold status, the suPply voltage to
the coil is + 5 V. Switching between these two supply voltages occurs at the
PFCOM terminal of the
PU 1501 when /PFENB is turned on or off.
7
STK-6022B (2A)
CPU (1 c)
Figure 2-23. Paper
1
I
Advance Motor Drive
Circuit
?
c,
~..,
2-20
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