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The width of the LF pulse generated by any of the above conditions
is adjustable.
In the standard 306 printer, R82 and R83 are not used and
jumper E5 to E6 is connected. In this configuration, R20 is adjusted so
that a 15 millisecond LF pulse is generated.
If the double line feed option controlled by the optional switch
on the operator panel is used, then jumper E4 to E5 is connected and R82
and R83 are used. With the switch in the "double line feed" position,
DLF is an open circuit and R20 has no effect on pulse width. R82 should
be adjusted to provide a 50 millisecond LF pulse. When the switch is
placed in the "single line feed" position, DLF goes to +5V, placing R29
in parallel with R82 and R83. With the switch in this position, R20 should
be adjusted to provide a 15 millisecond LF pulse.
While LF is high, LSI chip ME25 generates a low PMSOL signal which
activates the line feed solenoid via the Power Driver board. The trailing
edge of PMSOL triggers the 60-90 millisecond Delay Line Feed interval DLYLF.
During both the LF and DLYLF intervals, the printer remains busy.
4.7.2 FORM FEED
A form feed operation can be generated by either of the following
two conditions:
(l)
Receiving a form feed code (octal 014) - LSI chip ME25 de-
codes the form feed character and generates a low PMsoL signal
to activate the line feed solenoid. If the DSC option is used
(EI0-Ell), the line is printed before PMSOL is activated).
(2) Pressing the optional TOP OF FORM switch on the operator panel -
This generates a low TOFSW signal causing LSI chip ME24 to
generate a low PMSOL signal.
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