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5.3. Power circuit
The power circuit generates 5V DC for the logic circuit, and 24V DC to energize
the solenoids of the print head and two stepper motors.
5.4. Printer initialization
Printer initialization is accomplished in either of the two ways described below.
(1) Initialization takes place automatically each time the primary AC power
source is interrupted and reapplied (i.e.. by turning the Power Switch off
and on).
(2) Initialization may be initiated remotely by activating the INIT signal to the
parallel interface connector. This line should be driven by a TTL driver or its
equivalent.
The minimum reset pulse width is 50 psec at the receiving terminal. Upon
application of the initialization signal, the following sequence of events
take place in the Printer.
(a) The print head returns to its home position.
(b) The Printer is automatically placed ON-LINE, unless it is out of paper.
(c) The print buffer is cleared.
(d) The line spacing is set at 1/6 inch.
(e) The form length per page is set to 66 or 72 lines.
NOTE: The form length of 72 lines per page is applicable to only the version
*marked with identifier code "M72" on the rear side of the lower case
of the Printer.
(f)
Any stored vertical or horizontal tab stop positions are cleared.
(g) The character print-width logic is reset to the normal state.
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