Specifications

“)
REV.-A
2.3.5 MOTOR, PF Drive Circuit
‘)
The printer uses a stepping motor to advance the paper. The paper can be advanced for minimum of
1/380 inch. The nmtor is a 2-2 phase or 1-2 phase, constant-voltage drive type. P70 to P73 on the
CPU are the phase oontml ports forthe stepping motor. MOTOR, PF phase data output through these
ports. Cl to
C4 are turned on and off within the PU1501(IC3) acoording to the phase data sent from
the CPU.
When the paper advanoe motor is running, the supply voltage to the mil of the MOTOR,PF is +35 V.
When the paper advance motor is not running and is in hold state, the supply voltage to the coil is +5
V. Switching between these two supply voltages
oocursat the CPterminal of the PU1501(IC3) when
the switch is turned on or off.
TMP90C041
MOTOR,PF
pu,~(), , -- . ---------,
(IC21)
(IC3)
:
P70
B1
cl :
PFA
P71
B2
C2
PF-A :
P72
03
C3 :
PFB
P73
04
C4 ‘
➤ PF-B :
E05A50
(Icll)
P3
BP
Data
CP
A ,
d b
Bus
r
Figure 2-23. MOTOR, PF Drive Circuit
2-18