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HP -28S Manual Page 286

Advanced scientific calculator.
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Q:
The calculator
is
slower than usual, and the
0
annunciator
is
blink-
ing. What
is
happening?
A: The calculator is in Trace printing mode. Press
.1
PRINT
1
TRAC
to
turn off Trace printing mode.
Q:
The printer prints several lines quickly, then slows down. Why?
A: The calculator quickly transmits a certain amount of data to the
printer, then slows its transmission rate to make sure the printer can
keep up.
Q:
How can I speed up printing?
A:
If your printer is plugged into an adaptor, the calculator can safely
send data at a faster rate. To select faster printing, type 52 SF
1
ENTER
I.
This sets flag 52, which controls the printing speed. When
the printer isn't plugged into an adaptor, type 52
CF 1 ENTER 1
to clear
flag 52 and return to normal printing speed.
Q:
The printer drops characters or prints • characters. What
is
wrong?
A: The distance or angle between the printer and the calculator may
be too large, or there may be an obstruction blocking the transmis-
sion. See the printer manual for details about positioning the printer
and calculator.
Q:
What
is
the difference between STO and STORE?
A: The STO command assigns a specified value to a variable. The
STORE menu contains commands that perform
storage arithmetic,
us-
ing the value of a variable as an argument and assigning the resulting
value to the variable.
Q:
I expected a symbolic result, but I got a numerical result. Why?
A: There are values assigned to one or more variables. Purge the con-
tents of the variables (see HPurging a Variable H on page 52) and then
try again.
Q:
When I press
DRAW ,
the display clears, the
«e))
annunciator blinks
and then stops, but I don't see any points plotted on the display. Why not?
A: The calculated values are outside the current plot range. See
UChanging the Scale of the Plot" on page 91.
A: Assistance, Batteries, and Service
285

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