Texas Instruments TI-5015 User manual

TABLE OF CONTENTS
Page
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . .. . . .. . .. . . . .. .. . .. . . .. . . .. . .. . . .. . .. . . . .. . . .. . . . . 1
Electronic Printer Operation . .. . . .. . . .. . .. . .. . . .. . .. . . . . .. . . .. . . 2
BASIC OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Initial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Addition and Subtraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Error/Overflow Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Multiplication and Division . . .. . . . .. . .. . .. . .. . . .. . .. . . . . .. . . .. . . 8
Mixed Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
Operations with Grand Total Register ............................ 13
SPECIAL FUNCTIONS ............................................ 15
Add Mode Calculations ....................................... 15
Fixed Point Calculations ....................................... 16
Multiplication and Division by a Constant ......................... 17
Percent Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SERVICE INFORMATION . . . . . . .
.................................. 23
Printing Paper Replacement . .. . . .. . .. . .. . . . .. . .. . . .. . . .. . . .. . . 23
Printhead Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
In Case of Difficulty ............................................ 27
Calculator Exchange Centers . . .. . .. . .. . . .. . . .. . .. . . . .. . . .. . . . . 27
If
You Need Service Information ................................ 28
APPENDIX
Conversion Factors
............................. Inside Back Cover
USE ONLY TEXAS INSTRUMENTS TP-20225 OR TP-27225 THERMAL
PRINTING PAPER. OTHER PAPER MAY DAMAGE CALCULATOR AND
VOID WARRANTY.
IMPORTANT: Dim or partial printing may be remedied with the PRINTHEAD
CLEANING procedure on page 26 of manual.
IMPORTANT
Record the serial number from the bottom of the
calculator and purchase date in the space below. The
serial number is identified by the words "SERIAL NO."
on the bottom case. Always reference this information in
any correspondence.
Tl-5015
Model No. Serial No. Purchase Date
Copyright@ 1977, Texas Instruments Incorporated

INTRODUCTION
This electronic desk-top printing calculator provides a high degree of
versatility and performance. Its unique construction is made possible by the
whisper-quiet, electronic printer (no ribbon) and reliable integrated circuits
pioneered by Texas instruments. The convenience of the calculator is
accented by its easy-to-use keyboard, independent add register, grand total
register and many other features. Like all other products manufactured by
Texas Instruments, this calculator has been designed and built to provide
you with years of dependable service.
FEATURES
independent Add Register -Addition and subtraction with the familiar
entry sequence of standard business machines. Perform multiplication and
division without affecting previous add/subtract entries.
Grand Total Register -Automatically accumulates totals from the add
register. When the Grand Total is printed, this register is cleared and the
grand total
is placed in the entry register for further calculations. Serves as
an accumulator for add/subtract totals.
Light Weight- Weighs less than 2V2 pounds for convenient operation at
work or at home.
Electronic Printer -Quiet, smooth-running electronic printer developed by
Texas Instruments prints up to
10 digits plus audit trail.
Repeat
Entry -Once a number has been keyed into the calculator, it can
be entered as many times as you need by sequentially pressing an
operation key (
+, --).
Add Mode-For easy entry of dollars and cents, select add mode for
automatic decimal positioning at two places or select floating point for
maximum accuracy.
Fixed
Point Operation - A fixed decimal point (from 1to 9 decimal places)
is selectable via keyboard entry.
Non-Add Operation -Prints reference numbers without affecting
calculations.
Percent Key- Permits easy calculation of percentages for add-on, taxes,
discounts and other problems.
Automatic Constant -Multiplication and division by a constant number
without reentering numbers.
Keyboard Buffering -Enter additional numbers and functions while
calculator
is still printing.
Two-Key Roll-Over-Lets you press a second key even before the
previously pressed key is released.

ELECTRONIC PRINTER OPERATION
The paper used by the electronic printer is a heat-sensitive (thermal) paper
(Texas Instruments TP-20225 or TP-27225). The only mechanical part of the
printer is a precision stepper motor which advances the paper past the
electronic printhead that is stationary. When printing, small semiconductor
(solid-state) elements are heated very quickly by electronic circuits and
produce color spots on the thermal paper. These spots form the numbers
and symbols you can read on the thermal paper.
Since the printer is basically an electronic device, it does
not require special
ink ribbons or special maintenance. Using metal probes, sharp objects or
lubricants may damage the printhead or rubber roller. Please refer to
Service Information section of this manual for paper replacement
instructions and actions to take if a difficulty occurs.
NOTICE
THE PRINTING ON THERMAL PAPER MAY FADE IF
EXPOSED TO LIGHT OR HIGH TEMPERATURES FOR
LONG PERIODS OF TIME. FOR PERMANENT
STORAGE,
Al 'NAYS FILE PRINTED TAPES AWAY
FROM LIGHT AND
HEAT.
2

BASIC OPERATIONS
This desk-top printing calculator is quite simple to operate. You have
probably already used most of the functions successfully. However, there
are many valuable features of the calculator which are not obvious when
looking at the keyboard. The following descriptions and examples will assist
you in learning the detailed operation of your calculator.
INITIAL OPERATION
The calculator should be connected to 115 Vac/60Hz electrical outlet before
operating.
The power switch is located on the right side of the calculator. Push the
switch toward the rear ofthe calculator to apply power. Each time the power
switch is turned on, the calculator prints 0.T to indicate it iscleared and
ready for operation.
A paper advance
key[]] allows you to run out extra paperto create space
between problems orfor tearing off the paper after completing a problem.
ADDITION AND SUBTRACTION
Numbers are keyed into the calculator in the same left-to-right sequence
that you read them. Addition and subtraction entries are made with the same
rapid-entry style as most standard business machines. A unique feature of
the calculator is that addition and subtraction entries are kept separate from
multiplication and division entries within the calculator. This feature is
made possible
by the independent add register. The grand total register
accumulates totals from the add register and serves as a memoryfor add
register totals. Detailed examples ofthese features are shown in Mixed
Calculations.
The following keys are used to perform simple addition and subtraction:
Add Key[±] -Adds the last entered number orthe last printed result to the
independent add register. A
"+" symbol is printed tothe right of the number
added.
Subtract Key G - Subtracts the last entered number orthe last printed
result from the independent add register. A "- " symbol is printed
to the right
ofthe number subtracted.
Non-add/Subtotal Key M - When used immediatelyfollowing a number
entry, the entered number is printed with
the"#" symbol printed to the left of
the number. These numbers are for labeling only and are not entered into
the independent add register orthe grand total register and
do not affectthe
calculation in progress. When the key is used immediatelyfollowing a
function
key, the present subtotal of the independent add register is printed
with an
"S" symbol printed tothe right of this subtotal. The contents of the
independent add register and grand total register are not affected
by the
Mkey.
3

Total or Grand Total Key ~ - A single press of this key prints the total of
the independent add register with the "T" symbol printed to the right ofthe
total. This total is also placed
in the entry register and the grand total
register. The
~ key also clears the independent add register so that the
calculator is ready for new addition and subtraction entries. A second
consecutive press ofthe
~key prints the accumulated sum of all totals
from the independent add register with a "G" symbol on the right, clears the
grand total register and places the.grand total (GT)
in the entry register for
further use if needed. The GT register accumulates totals from the
independent add register only when
the~ key is pressed. (See
Operations with Grand Total Register for example.
Clear/Clear-Entry
Key~ -When used immediately following a number
entry, this key will clear the entered number and allow another number to be
entered
in its place without affecting the independent add register or the
grand total register. Note thatthis key will not clear the independent add
register or the grand total register. Pressing
~once, automatically clears
the independent add register afterthe total is printed.
Pressing~ a second
time will cause the contents of the grand total (GT) register to be printed and
the GT register to be cleared. See Multiplication
and Division for further
explanation of the
~ key.
The decimal point key is used wherever itappears in a number. When the
decimal is not entered, the calculator automatically prints the decimal point
to the right ofthe last number entered
when[±] orG is pressed.
Example: 5.67 + 6 = 11.67
Enter Press Print
O.T Set power switch to ON
5.67
[±] 5.67+
6
[±] 6.+
~ 11.67T
After
the~ key is used, a new problem can be entered without manually
clearing the independent add register.
When a total is negative, a minus sign appears to the left ofthe total.
Example:
-8 + 3.21 -4.6 = -9.39
Enter Press
a G
3.21
4.6
4
Print
8.-
3.21+
4.6-
-9.39T

The repeat add/subtract feature ofthe calculator allows you to repetitively
add or subtract the same number withoutreentering the number.
Example: 4.59 + 4.59 + 4.59 - 6 - 6 =
1. 77
Enter Press
4.59 [:±]
[:±]
[:±]
6 G
G
Print
4.59+
4.59+
4.59+
6.-
6.-
ill@ 1.77T
A subtotal is desirable when you wish to obtain intermediate and final
results.
Example: 1.064 -.018 = 1.046
1.064 -.018 + 1.19 = 2.236
Enter
1.064
.018
1.19
Press
[:±]
G
M
[:±]
ill@
Print
1.064+
0.018-
1.0468
1.19+
2.236T
When used immediatelyfollowing a number entry, the M key will cause the
number
tQ.be printed without affecting the calculation.
Example: A listing shows a certain rating number for six different items. Find
the total rating of item number
1, 4 and 6.
Item No. Rating No. Item No. Rating
No.
1 17 4 76
2 8.5 5 14.5
3 45 6 34
Enter Press Print
1 M
#1.
17 [:±]
17.+
4 M
#4.
76 [:±]
76+
6 M #6.
34 [:±]
34.+
ill@ 127.T
5

Occasionally, you may catch yourself entering an incorrect number oreven
decide the numberyou keyed
in is not wanted. When this happens, the~
key can be used to clear the unwanted entry.
Example: 49.01 + 16.55 + 4.9 = 70.46
Enter Press Print Comments
49.01 rn 49.01+
16.555
~
Remove incorrect entry
16.55 rn 16.55+ Enter correct value
4.9 rn 4.9+
~
70.46T Total
Unwanted entries can also be effectively eliminated from the total value after
theITJ orG operation by simply using the opposite operation to cancel
the effect ofthe unwanted entry.
Example: 49.01 + 16.55 + 4.9 = 70.46
Enter Press Print Comments
49.01 rn 49.01+
16.555 rn 16.555+ Faultyvalue entered
G
16.555- Faultyvalue removed
16.55 rn 16.55+ Correctvalue entered
4.9 rn 4.9+
~
70.46T
Total
If you accidentally use~ when you intended to useM, the total is easily
reentered intothe independent add register with
the[±] key. However,
remember that each total
"T" is summed to the grand total register.
Example: 156 + 65 + 320 =
541
Enter Press Print
156 rn 156.+
65 rn
65.+
~
221.T
rn 221.+
320 rn 320.+
~
541.T
If you frequently perform calculations involving dollars and cents, you may
wish to use the convenient add mode feature of the calculator described
later
in this manual.
6

ERROR/OVERFLOW CONDITIONS
You can enter up to 10 digits into the calculator. If you enter 11 or more
digits,
an entry overflow occurs which causes the calculator to clear the first
11 digits entered and print ERROR. However, if the 12th, 13th, etc., digits
have been entered, they are accepted as part of the new entry. When this
occurs, press 1™and you can reenter a number that has 10 or less digits
without affecting previous entries.
Example: 123456.7899 + 555765.4321 = 679222.222
Enter Press Print Comments
123456.7899 rn 123456.7899+
5555765.4321 ERROR
11 digits entered
1 ™ Clear for new value
555765.4321 rn 555765.4321+ Correct value entered
[!fill 679222.222T Total
A register overflowwill also cause ERROR to be printed. If the accumulated
contents ofthe add registers are larger than 9999999999
(1 Odigits) or
-999999999 (9 digits for negative results), ERROR Tis printed and the
contents of that register are automatically cleared.
Example: 9,999,999,999 + 1 = Overflow
Enter
9999999999
1
Press
rn
rn
Print
9999999999.+
1.+
ERRORT
If grand total overflow occurs, the calculator prints ERROR G, skips a line
and clears the grand total register. The independent add register and entry
register are also cleared for a new problem to be entered.
Enter Press Print
3333333333 rn 3333333333.+
[!fill 3333333333.T
4444444444 rn 4444444444.+
[!fill 4444444444.T
5555555555 rn 5555555555.+
[!fill 5555555555.T
ERRORG
The calculator uses 5/4 round off for 10-digitpositive or 9-digit negative
results. This means that an internal result of
-999999999.4 will round off to
-999999999. However, -999999999.5 will round upcausing an overflow. In
addition, the round off operation occurs with each entry. If thevalue 0.4 is
added to 5555555555, the internal result is rounded off immediately to
5555555555 again as if the 0.4 were never entered.
7

MULTIPLICATION AND DIVISION
Now that you are familiar with the addition and subtraction keys on the
keyboard, the multiplication and division at the top of the keyboard will be
described.
Keep in mind that multiplication and division operations are independent of
addition and subtraction. The summing of a column of numbers can be in
progressand
an intermediate calculation involving 00, e±::I and[§] can be
performed without affecting the summing operation. See Mixed Calculations
for further explanation and examples.
The four basic keys concerned with multiplication and division are:
Multiply Key 00 -Causes the last entered number or last printed result to
be printed
as the multiplicand with a "x" symbol printed to the right of the
number.
Divide Key e±::I -Causes the last entered number orthe last printed result
to be printed
as the dividend with a"+" symbol printed to the right of the
number. Division by zero is invalid and will cause ERROR to be printed.
Equals Key[~ -Completes multiplication or division. When used
following multiplication or division, the last entered or printed number is
printed as the multiplier or divisor with an
"=" symbol printed to the right of
the number. Then the result is printed with no symbol tothe right.
Clear/Clear-Entry Key @lg~ -When used immediately following a number
entry, this key will clear the entered number and allow another number to be
entered in its place without affecting previous entries. When used following a
00 or G:J entry, or pressed twice after a number entry, a "C" symbol is
printed to indicate that the multiplication or division problem has been
cleared and the calculator is ready for entry of a new problem. In mixed
calculations, this key will not clear the independent add register or grand
total register.
Multiplication and division problems are quite simple to solve since most
problems maybe entered in the same order they are written.
Example: 24.3 x 15 = 364.5
Enter Press
24.3 00
15
Example: 130 ..,._ 6.5 = 20
Enter
130
6.5
[§]
Print
24.3x
15.=
364.5
Print
130-;-
6.5=
20.
Notice that it is not necessary to press
[CZ"~ after a problem before starting a
new problem when
the[§] key is used.
8