Initialization - OKIDATA ML320 Service Manual

2.3.01 Initialization

In Rev A, B, and C printers, initialization occurs whenever the printer is powered ON or when the
signal I-PRIME is received at the parallel interface.
In Rev D printers, initialization occurs whenever the printer is powered ON, or when the RSTOUT
signal is sent from the reset circuit (Q11) Pin 2 to Q1 and Q3.
The initialization sequence is as follows.
In Rev A, B, and C printers, Q7 and Q11 are reset. In Rev D printers, Q1 and Q3 are
reset.
In Rev A, B, and C printers, the operating modes of Q7 and Q11 are set. In Rev D printers,
the operating modes of Q1 and Q3 are set.
Memory (ROM and RAM) is checked.
RAM is initialized.
Carriage homing is performed. The carriage will move to the left until it contacts the left
frame.
The program then establishes the interface signals (ACK, BUSY) and the SEL lamp lights.
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Service Guide ML320/ML321
Chapter 2 Principles of Operation
Page: 24