Specifications

REV.-B
I 2.3.5 MOTOR, PF Drive Circuit
The printer uses a stepping motor to advance the paper. The minimum amount of paper that can be
advanced is l/360 inch. The motor is a 2-2 phase or l-2 phase, constant-voltage drive type. P70 to
l P73 on the CPU are the control ports for the stepping motor. MOTOR, PF phase data is output through
these ports. PFA to PFD are turned on and off within the STK-6022B according to this phase data sent
from the CPU.
I
When the MOTOR, PF is running, the voltage supplying the coil of the MOTOR, PF is +35 V. When the
MOTOR, PF 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 STK-6022B when PFENB is turned on
or off.
CPU (1C)
P70
P71
P72
P73
t=
Ja-
E05A50 (4D)
STK-6022B (2A)
PFAIN
PFBIN
PFCIN
PFDIN
PFA
PFB
PFC
PFD
MOTOR, PF
PFENB PFCOM
+35 V or $5 V
Figure 2-23. MOTOR, PF Drive Circuit
2-18