42114101 Rev.1
23 /
(1)
Space Motor Control
The SP motor driver (MHM2025) drives the three-phase brushless motor based on the
phase signal (SPU, SPV and SPW) from the LSI and the speed instruction data from the
MPU. The MPU can identify the current speed of the space motor by measuring through
the LSI the pulse length of the output (øA, øB) of the slit encoder included in the space
motor.
By comparing the target speed for each print mode with the actual current speed to change
the speed instruction data, the motor speed is accelerated or decelerated to maintain the
specified speed for each print mode.
SP truth table
HALL
AMP
INPUT
OUTPUT
SPU
SPV
SPW
U
V
W
H
H
L
OPEN
L
H
H
L
L
L
OPEN
H
H
L
H
L
H
OPEN
L
L
H
OPEN
H
L
L
H
H
H
OPEN
L
L
H
L
H
L
OPEN
SPU
SPV
SPW
Summary of Contents for ML490 Series
Page 1: ...42114101 Rev 1 1 135 ML490 491 PRINTER Maintenance Manual ODA...
Page 2: ...42114101 Rev 1 2...
Page 38: ...42114101 Rev 1 38 Drive gear Ink tank Ribbon cartridge Figure 2 6...
Page 48: ...42114101 Rev 1 48 Change arm Change lever Platen Release cam Figure 2 13 REAR TOP BOTTOM...
Page 96: ...42114101 Rev 1 96 9 Carriage Assy NK2 10 SUS Bearing portion of guide roller EM 30L B...
Page 119: ...42114101 Rev 1 119 6 8 9 7 1 2 3 11 10 4 5 Figure B 2 Printer General Assy...
Page 124: ...42114101 Rev 1 124 9 12 11 1 13 3 7 1 14 5 6 7 2 10 8 Figure B 4 Carriage Assy...