Oki ML421 Maintenance Manual - Page 24

Utility Mode

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Oki Data CONFIDENTIAL (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 1/120" IPT 12 CPI IPT 15 CPI 1/144" 1/180" IPT 17 CPI IPT 20 CPI 1/206" 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] 42113901 Rev.2 24 /

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42113901
Rev.2
24 /
Oki
Data
CONFIDENTIAL
1/720"
1/120"
SPU
SPV
SPW
PHASE-A
PHASE-B
1/144"
IPT 10 CPI
IPT 12 CPI
IPT 15 CPI
IPT 17 CPI
IPT 20 CPI
1/180"
1/206"
1/240"
(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
[FORWARD]
PHASE-B
[REVERSE]
PHASE-A
(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.