Initialization - OKIDATA ML320 Turbo Service Manual

Page: 6
Service Guide ML320/321Turbo
Chapter 2 Operation Description

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 MPUs and
LSIs. When resetting ends, the program starts and the LSIs are reset by MPU via LSIRST-N. Reset
operation by I-PRIME starts the program to initialize, but does not reset the MPU.
The program sets the mode of the LSI including the MPU, 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. When the ready state is set, the host is informed that the printer is
ready to receive data.