Oki ML520, ML521 manual Principles of Operation Initialization

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Service Guide ML520/521

Chapter 2 Principles of Operation

2.1.02 Initialization

This printer is initialized when the printer is powered on or when the I-PRIME-N signal is input from the host via the parallel interface.

The steps in Printer Initialization are listed below.

The RST-N signal is output from the reset circuit to reset the MPU and LSIs.

The program is executed and the LSIs are reset by the MPU via IORST-N.

NOTE:

A reset operation initiated by I-PRIME does not reset the MPU.

The program sets the LSI (02D) mode, checks the memory (ROM/RAM), then executes carriage homing and determines the phase of the line feed motor.

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 indicate that the printer is in the ON-LINE state.

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