HP 7475a, Operation And Interconnection Manual

Page: 34 / 101

Front Panel
1.
2.
2-16
PLO'ITER OPERATION
PAPER LOAD I/PAPER HOLD
I
-
Moving the paper
loading lever to the
PAPER LOAD
I
position
turns on the
ERROR
light and initiates the
following:
a. Raises the pinch wheels and returns any
pen currently held in the pen holder to the
pen stall from which it was selected, or
into the lowest·numbered empty position if
its original carousel position has since be­
come unavailable. The pen holder moves
to the right side of the platen.
b. Aborts any in-process HP·GL vector or area
fill command.
Returning the paper loading lever to the
PAPER
HOLD
I
position turns off the
ERROR
light and
initiates the following:
a. Lowers the pinch wheels to secure the plot­
ting medium. The plotter assumes new paper
has been loaded, but maintains any pre­
viously set PI/P2 coordinate values.
b. Cancels any pending error
(ERROR
light
blinking) due to having received a move
command with the pinch wheels up.
NOTE: If an
110
error or an HP-GL error
other than number
8
is set, the
ERROR
light
will continue blinking
. •
P1/P2
-
Pressing
P1
or
P2
causes the plotter to
raise the pen and move it to the current coor­
dinate location of scaling point PI or P2. On
power-up, the default PI location is in the
lower·left corner of AI A4 size paper or in the
upper·left corner of BI A3 size paper. In each
case, the default P2 location is in the corner
opposite from PI. The exact default coordinate
locations of scaling points PI and P2 are
listed in the tables given under the paragraphs
entitled The Scaling Points PI and P2 and
IWtating the Coordinate System.
Pressing
P1
or
P2
simultaneously with the
ENTER
pushbutton establishes the current pen loca·
tidn as the new coordinates of scaling point
PI or P2.