Genicom MatrixPrinter LA36 - Manual (Page 114)

5-27
5.3.4 Carriage motor control
The 4-phase carriage motor, is driven by a constant current chopper drive circuit and six control signals:
SPM0: This signal drives phase A of the carriage motor.
SPM1: This signal drives phase B of the carriage motor.
SPM2: This signal drives phase C of the carriage motor.
SPM3: This signal drives phase D of the carriage motor.
SPI1, 2: These signals switch the carriage motor phase current. Four current levels can be selected for
high speed, low speed, and stop.
Figure 5.25 Stepping motor drive circuit
MPU
MB90706
SPM0 to 3
or
LFM0 to 3
SPI1, SPI2
or
LFI1, LFI2
RAM
HDLSI
MBCU20050
SPALML or LFALML
SPALMS or LFALMS
POWST
Fire
check
circuit
SP or LF motor
+34V