Oki ML490 Maintenance Manual - Page 24

LF Motor Control

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(2) Encoder Disk In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generated when the encoder disk interrupts the photo sensor. The LSI divides these edge pulse signals in accordance with the print pitch, and sends the IPT signal to provide dot-on timing and carriage position detection timing. SPU SPV SPW PHASE-A PHASE-B 1/720" • UTILITY MODE IPT 10 CPI 12 CPI 15 CPI IPT 17 CPI 20 CPI 1/120" 1/240" (3) LF Motor Control The LF motor driver (MHM2025) drives the LF motor in two-phase or 1-2 phase bipolar, based on the phase changeover data and the output current data from the MPU. The data from the MPU is processed by a specific register contained in the LF motor driver to measure the overdrive time and to change the phase. PHASE-A PHASE-B [FORWARD] [REVERSE] 42114101 Rev.1 24 /

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42114101
Rev.1
24 /
(2)
Encoder Disk
In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generated
when the encoder disk interrupts the photo sensor.
The LSI divides these edge pulse signals in accordance with the print pitch, and sends
the IPT signal to provide dot-on timing and carriage position detection timing.
•
UTILITY MODE
1/720"
1/120"
SPU
SPV
SPW
PHASE-A
PHASE-B
IPT 10 CPI
12 CPI
15 CPI
IPT 17 CPI
20 CPI
1/240"
(3)
LF Motor Control
The LF motor driver (MHM2025) drives the LF motor in two-phase or 1-2 phase bipolar,
based on the phase changeover data and the output current data from the MPU.
The data from the MPU is processed by a specific register contained in the LF motor driver
to measure the overdrive time and to change the phase.
[FORWARD]
PHASE-B
[REVERSE]
PHASE-A