Initialization - Oki ML420 Maintenance Manual

2.1.3 Initialization

This printer is initialized when the power is turned on or when the I-PRIME-N signal is input
from the host side via the parallel interface.
For the initialize operation, the RST-N signal is first output from the reset circuit to reset the
SOC and Flash ROM. When resetting ends, the program starts. Reset operation by I-PRIME
starts program to initialize, but does not reset the SOC.
The program here sets the mode of the SOC, checks the memories (ROMs and RAMs), then
carries out carriage homing, and determines the LF motor phase.
Finally, the program establishes the interface signals (P-I/F: ACK-P signal sending, and S-I/F:
BUSY-N signal off) and lights the SELECT lamp to inform the ready state for receiving to the
host side and ends the initialize operation.
After USB I/F control I/O initialization and USB I/F bus opening.
42113931TH Rev.1
SOC RESET
Initial Setting
Internal RAM
CHECK
ROM CHECK
RAM Clear
LF Motor Phase
Initialization
Carriage Homing
Serial
I/F
I/F BUSY OFF
USB I/F Bus Open
Start
SOC
I/F ACK Send
End
Oki Data CONFIDENTIAL
Parallel
I/F
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