Print Pat/On Ln/Print Bfr Or Print Pat/On; Start Print And Mode 1/Mode 2 Switches; Paper Handling Controls; Paper-Advance Knob/Vertical Alignment Vernier - IBM 3270 Operator's Manual

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Printer Operation
PRINT PAT/ON LN/PRINT BFR
or PRINT PAT/ON LN Switch
START PRINT and
MODE 1/MODE 2 Switches
Paper Handling Controls
Paper-Advance Knob/
Vertical Alignment Vernier
This switch (also called the CE switch) is a two- or three-position
switch, depending on the type of printer. The purpose of the
three-position switch is to place the printer on-line (ON LN
position) or in either of two off-line test positions: print pattern
(PRINT PAT) or print buffer (PRINT BFR). The two-position
switch found on some printers does not have the PRINT BFR
position. You will use only the ON LN and PRINT PAT
positions of this switch. (The PR I NT B F R position is normally
for service personnel.)
When the printer is operational and under control of the
computer program, this switch will be in the ON LN position.
When you must place the printer off-line (for example, when
preparing to change a ribbon cartridge), the switch is placed to
the P R I NT PAT position.
These switches are used in a sequence. Once the printer has been
placed off-line (by moving the right test switch to the PR I NT
PAT position), either of two print patterns may be selected (by
placing the mode switch in the MODE 1 or MODE 2 position).
Then, by sliding the START PRINT switch forward, the printer
wi II be activated to print out the selected pattern. The MOD E 2
position produces an H pattern used for precise paper alignment;
this is the only mode used by the operator.
The paper-advance knob provides an adjustment for approximate
positioning of the paper forms in the printer. You'll find the
paper-advance knob at the right end of the platen. When you
rotate the knob, the platen and paper move together. As you
turn the knob you can see how the pins coming from the platen
fit the holes in the ends of the paper and "feed" the paper
through the machine.
The vertical alignment vernier provides an adjustment for
exact positioning of paper forms. This control is activated by
pressing in and rotating the paper-advance knob from the right
side of the pri nter.