Bowmar MX75 User manual

•

1NTRODUCTION
Your MX75 is light enough and small enough
to be used in one hand, but it provides a
standard keyboard and a light emitting diode
(LED) display that is easily read at home or in
the office,
The eight digit display and the full floating
decimal allow the calculation
of any problem
without sacrificing accuracy,
Whether you want to solve engineering or
budget problems, your calculator has the ability
with features such as clear entry, percent
mark up and discount, and an omni-constant
that will perform integer powers, reciprocals
and fractions as well as chain and mixed
calculations.
This machine's greatest attribute is its
Memory. Combine the memory add and subtract
operations with the other features of this calcu-
lator and any calculation that confronts you is
made simple.
The battery
will recharge in seven hours
and operate
the calculator fOTHve, but with the
charger/power supply no useful time will be
lost sinee it operates the calculator while
charging it.
We suggest that
this Instruction Manual be
read with the calculator in hand. Performing the
operations as you read them will increase
your
familiarity with them. For a quick reference, an
outline of operations is on the back of the
calCUlator.
,
•
;
OPERATION
AC Operation:
Set 115/230 switch on Charger in appro:
priate position. Connect the Charger unit
to any standard 115/230 Volt electrical
outlet and plug the connector into the
Calculator. After the above connections,
the power switch may be turned on and
operation started. (While connected to AC
the internal batteries are automatically
charged whether the power SWitch is
"ON" or "OFF".)
Battery 0 peration :
Disconnect the Charger cord and turn the
power switch "ON". With normal use a
full battery charge can be expected to
supply about 5 hours of working time.
NOTE: When the low battery indicator
(L) on the display is lighted, do not
continue battery operation, This
indicates need for a battery charge.
Battery Charging:
Simply follow the same procedure as in AC
operation. The Calculator may be used
during the charge period if desired. In order
to fully charge a battery which has been
completely discharged, 7 hours is required.
In most cases, an overnight charge should
be adequate if the batteries have not been
fully discharged.
NOTE: Although no damage will result
from prolonged periods with the Charger
connected, it is advisable to remove the
Charger cord when the Calculator is not
in use after a full recharge cycle.
CAUTION: To avoid possible damage, use
only the charger provided with the calculator.
1
,.,-' .,,'.-.-. -.;-----~.--. .
,," - - .
,. .---. ," ... -- , .. -' .... .-
.. -"' - -' .--.
','.' - """"_"", c-·,·'--,·

.. ,--
'.-' - ".-
"._-, ..
, ',; :,< ...... "
.. ".'; ','
•-.:. 0.-
CONTROLS &INDICATORS
1.
"ON" Switch
Turns Calculator "ON"
& "OFF",
•
point.
Enters a
decimal
Changes the sign of a multi-
ply or divide answer. SUb-
tracts the entered number .
Enters a "divide" command.
Clears content of memory.
Enter digits of a number
(limit 8 digits).
Completes a percent
operation and conditions
a discount or markup
operation.
Completes multiply or divide
operation .
Add the entered number
Entersa "multi ply" command.
Clear Calculator and the
display of all numbers. (Does
not clear memory.)
Recalls and displays content
of memory.
Automatically accumulates
results into the memory
whenever the - or % keys
are touched.
Keys
Key
Key
Key
-
•Key
CICE
aKey
EI
II Key
Switch"left"
!M!i Key
•
II Key
,.
-
13.
ACCESSORIES
12.
11.
10.
8.
9.
7.
5.
6.
3.
4.
2.
,
,
8.
5.
1.
4.
9.
7.
6.
10.
11.
2.
3.
12.
13.
214.
Charger IPower Supply

"._, : ..... ; '''','0''.'; _,., ••.• .... , ... "" " .... __ "",, _"" .. _ " , ','" __
,'.'.' .. ' ",''-
," ,,','. ", " ,- -' -- .
Overflow
Indicates a calculation result
BATTERY NOTES
Indicator that contains more than eight
digits. 1.
With normal use at room temperature, afull
Appears as
batterycharge can beexpected to supplyabout
5
hours of accumulated working time.
2. TheCalculator may be used while itsbatteryis
Low Battery Warns of need for batiery
charging.
3. Batteriesthat havebeen neitherused
nor charged
Indicator charge during battery
for as long as2 or 3 months will suffersubstantial
operation.
loss of operating time through atendency to
Appears8s
self-discharge. As ageneral rule, batterieslose
•
about 1%charge per day due to self-discharge,
Minus Sign
Activated by the II key for
at normal temperatures.
4. For optimum performanceand long life:
Indicator operations with negative a. Alternate frequentlybetween Battery and
numbers.
ACpower.
Appears as
b. Operate at or nearnormalroom temperatures.
c. Chargeas soon aspossible upon appearance
of the Low-Batteryindicator.
Decimal Point
Automatically appears to the 5. Recharge time is 7hours
f~f afully discharged
battery, with the calculatoroff.
Indicator
right of any number entered.
6. The Low-Battery indicatorisdesigned to appear
unless inserted in another
as soon asbatteryvoltage drops to the lowest
sequence by use of the
value that w\l\ support optimum performance of
theCalculator. Should further dischargeoccur,
Decimal key. With fractional
through continuedoperations or self-discharge,
numbers, It will be preceded
the Low-Battery indicator mayfail to appear.
by a zero.
Do not continue to operate on batterieswhen
this condition is noted, or adamaged battery
may result.
Memory in Use
7. As ageneral rUle, if improper operation occurs.
Indicator
first try theCalculator with its chargerconnected.
If operation is then normal, this indicates the
•
Indicates use of memory
batteriesarelow.
8. Do not store the unit in high temperatureamas
function after ~ switch is
such asthe top of radiators or the rear deck of
turned left and = key is
automobilesexposed to the sun. The Calculator
touched.
•
will operatesatisfactorily overan ambienttem-
peraturerange
of 0 to SOC (32 to 122F) and
relative
humidity to 95%.
45
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.. " ..

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,_ .' .. ' .. ", ",' ..... ',' ,"', " .. ·c. ' , ...., "',,',,'-.''-'.' ", .. --' ,,' ,,-' .. ,--',',', .... ', .. '"
INSTRUCTIONS
D. To clear 13, touch the
Display win be
GIG
Kevonce
"
•
E. Then enter '12'
Display will be:
F. Finally, touch the akey for answer
Display will be:
4. To clear (erase) memory
A. Touch the mr!l key
B. Content of the memory will be:
,
,
.• 5a. To enter (write) into memory
Example: 123.45
A. Touch twice
B. Clear memory by touching m once
C. Push .. on (left)
D. Enter number 123.45 into display
E. Touch II . Number in display
enters memory.
5b. To recan (di$play and make available)
memory
A. Clear display by touching tfm
twice
B. Touch t!Jil once
Display will be:
Note: Use
~ during, or immedi·
ately after entry of a number to clear
entry. Use of ~ key when a
result is displayed without overflow
clears the result.·
twice
CleE
A mistake!
key twice
6
CICE
B. Then touch number and decimal keys
for 128.45 one at atime. Always start
with the leit hand digit and progress
from left to right.
Display will then be:
C. Then you enter 13 by mistake
The display is:
B. You now touch the" key
Display will be:
B. Cleared display will be:
2. To enter (wrlte.a number)
Example: enter 123.45
A. First, clear by touching
3. To clear an Incorrect entry
Example: 48+ 12 is your calculation
A. You have already entered 48
Display is:
1. To clear (erase)
A.
Touch the
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,,'----
.. ,' ",,,,,'

,-... ,'. .
.. " .. .-, c· '''.'''' '.-.', ,--,', '.'. ','.".' , .. '.','-. '," _".,' '.' .', ._ ...'.-"_ ., " ," _'c'" .... ,•.. ', ;·.'''i,''"·' "" ,'"':• .-, ..-..>•.'.,_.,,.,, __ , , :.',' ',,' "" ,'.'.'- ",: "':'.';'::'; ,..,.,',,,.,"-',,_.,.,.,;.- -'-'.
;, ... _.,.,:.,<.,.'., ...... ',':'-,-. ' .. ,,--,,' '. :"'>""':";'-~':"., ,.", ,,--,,'.,'.', ," " ",,:.::: .-', .. ' ",."
CALCULATIONS
1. ADDITION
Example #1: To calculate 16.39 +9.83 =
Do these steps display will be
2. SUBTRACTION
Example #1: To calculate 12.81 -3.6 =
Do these steps display will be
a. Touch
C/CE
tWice
a. Touch
C/CE
twice
b. Enter 16.39
c. TOUCh.
d. Enter 9.83
•
b. Enter 12.81
c. Touch.
d. Enter 3.6
26.22
Example #2: To calculate 23 - 6 + 2.1 - 5 =
Do these steps display will be
e. Toucn. Answer
Example #2:
To calculate 16 +9+8.3 + 4.1 =
Do these steps display will be
e. Touch. Answer .9.21
a. Touch
C/CE
twice
a. TOllCh
•C/CE .
twice
b.
Enter 16
c,
Touchll
d.
Enter 9
e.
Touch.
t.
Enter 8.3
g.
Touch.
h.
Enter 4.1
•TouCh •Answer
I.
"16.
4.1
,"" ",.,,', ....
b. Enter 23
.'" '.' .. "
.. --'
23.
'.' 17.
2.1
19.r
r.
V.
..

•
31 x6 -
31 x8.2 =
31 x7.6 =
display will be
11
twice
twice
G/GE
G/GE
Example #3: To calculate
Use of Omni-Constant
8. Touch
Example #2: To calculate 3x 21 x 6.11 =
Do these steps display will be
Do these steps
a. TOUCh
b.
Enter 31
c.
Touch II
d. Enter 6
e.
Touch •1st
Answer
,
f.
Enter 8.2
twice
b. Enter 3
c.
Touch II
•d.
Enter 21
e.
Touch EI
~
f. Enter 6.1
g.
Touch •
Answer
tWice
Answer
G/GE
G/GE
b. Enter62
C. TOUCh.
d. Enter 82
e. TOUCh.
f. Enter 10
i. TOUCh.
Example #3:
To calculate 62 - 82 + 10 - 40 =
Do these steps display will be
a. Touch
g. TouCh.
h. Enter 40
a. Touch
3. MULTIPLICATION
Example #1: To calculate 29.32 x56.5 =
Do these steps display will be
b. Enter 29.32
c. Touch
II
d. Enter 56.5
e.
Touch II
Answer
"- --'.-_." --- -." •. - " __ -- --.-:- C""'. - __ ,',-,-,',',' ,' ,--- , ,. ''',''_. ,'._.,.,_ '_'_"/' ._'. __ ._~._ .'. _._._ _._ •••••••• _ _ •• _ ._~_,.-c."',', _-'"- ._- -, . __ . __ ,~._

•
181 -7 15 ==
96 -7 15 =:
117 -;- 15::::
display will be
C/CE
e. Touch. 1st Answer
f. Enter 96
g. Touch II2nd Answer
h. Enter117
i. Touch II 3rd Answer
a. Touch twice
Do thes.e steps
e. Touch.
f. Enter 9
g. Touch. Answer
Example #3: To calculate
Use of Omni-Constant
.b. Enter 181
c. TouCh.
d. Enter 15
J
'}
twice
twice
C/eE
O/CE
b. Enter 81
a. Touch
Example #2: To calculate 81 -7 3 -7 9=
Do these steps display will be
c. TouCh.
b.
Enter 376
c.
TOUCh.
d. Enter 53
.
e.
TOUCh.
Answer
a. Touch
4. DIVISION
Example #1: To calculate 376 -753 =
Do these steps display will be
i. Touch II 3rd Answer
g. Touch II 2nd Answer
h. Enter 7.6
d. Enter 312
13
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- • '. "" ._ .'.'_, • .-:: "-~ .. '.,.-_ _,-, - C', .-.' , ••. , _,'.'._'_.,".'.' ' ';"'_""''','''''''' ,'_ "'.... .._" """"""',"'" "~""',"",""_'

, ",', '.''c,c'· ,", "',."" '.' ','.', c ",",'., ',',' ," ',.',.'
,., .. ,."" .. ".. ', ,''C.,;." ..... ", .. ,
', ... ',',',' '>" .... 0 .. :.' ,',,:,,',,','.",',',",: ',' ' .•
C/CE
a. Touch twice
6. EXPONENTS
Example #1: To calculate (3)5 =
Do these steps display will be
e. TouCh •
f. Enter5
g. TOUCh.
h. Touch 13
•
Enter 8
I.
•
Touch •
j.
k. Enter 20
•I.
Touch.
m. TouCh.
n.
Enter8
o.
TouCh.
Answer
twice
C/CE
i. Touch II
j. TOUCh. Answer
(9 +6 - 5) x8
20 -8=
Do these steps display will be
a. Touch
Example #2:
To calculate
b.
Enter 23
c.
Touch 13
d. Enter 4
e.
Touch II
f.
TOUCh.
g.
TOUCh.
tl.
Enter 6
.5. MIXED ARITHMETIC
Example #1: To calculate 23 x (-4}";- (-6) =
00 these stens display will be
15
b. Enter 3
c.
Toucha
d. TOUChll
e. Touch II
14
twiceC/CE
a. Touch
b. Enter9
c. Touch a
d. Enter 6
,, , ... ".' _.' ,,
"'~"'. ':"':' ".-:''" ,'. " , ... , .. '," ",' ,",- ','.', '-- "",' .,",-,'.' .•.• ', " "',,,, ' __ " '."" • '.'," __ , __ C', ","
",. '. ..',c"",' ... ' ,,,,'.'"

1. Touch II
g. Touch II Answer
8. REPEATED ADDITION
Example #1:
To calculate 6+3+3+3=15
Do these steps display will be
twice
G/GE a. Touch
b.
Enter 6
,.
c.
TOUCh.
d. Enter3
•
e. Touch II
f. Touch II
g. Touch II
Answer
The"[" symbol indicates "overflow", or an
answer of more than the 8 digits shown. The
8 most significant digits are displayed.
7. OVERFLOW INTERPRETATION
The overflow indicator "[" witt appear when
the display capacity of the Calculator is
exceeded.
For example, multiplication of
12345678 x345678 =4267629279684
will give the following display
•
Add into memory
Example #1:
To calculate (2x6) +(13x2) + (3x4) =
Do these steps display will be
a. Touch twice
b. Touch II; once
c. Push .. on (left)
d. Enter 2
9. USE OF MEMORY
...
G/GE
C/CE
Use the key once to clear the overflow.
Operation of the key again will clear
the answer.
16 17
-, -, "-,
.. :, .... ',.'. -- - "' .. "':. ', .. :."-

, ,'," •• ":: ,',.' cc··: .',.':.- ;:--., .... " •",. :",.' --. -' .. .- __ '.' •• '','.'' ,.'.-. '.' ....'.'.',' .. ',' ." .... ',. " ',' .', ',,'.',":'._','.',. ,',',' '.', .. ' .
once C/CE m. Touch
n. Enter 10
o. Touch II
p. TOUCh lIi1
f. Enter 31
g. Touch
II
{496.0 has now entered memory}
h. Enter 18
•Touch
II
I.
•Touch
II
•J•
k.
Enter 3
I.
Touch II
•(6 has
now been subtracted
from 496.0 =490.0)
•
e. Touch II
1. Enter 6
g. Touch iii
h. Enter 13
i. Touch II
j. Enter 2
k. Touch II
I. Enter 3
m. Touch II
n. Enter 4
o. Touch II
p. Touch IIiI
•
19
18
Subtract from memory
Example #2:
To calculate (16x31) -(1S";-3) + 10 =
Do these steps display will be
a. Touch twice
b. Touch III once
c. Push _ .on (left)
d. Enter 16
e. TOUCh II
.' ":-':"".'-"'-';"'~"':";:',:,-,~:':"-": ,"", ,'. ", -, ---. "' .. ", ',',', ;. ,"'.', ... '
,', ... .-,--,-.'_ ... ~", ',,, ..... ," --',.-----,--'--',- .. ,--'",'", .. ".".,".-.-- .. _, ... '., ,", ..... ,',':.--, '.--'", .. '--' ,.'" ,,-----.,',',

•
display will be
C/CE
C/CE a. Touch twice
11. PERCENTAGE
Example #1: To calculate 5% ot 125
Do these steps display will be
b. Enter 125
c. Touch EI
a. Touch twice
d. Enter 5
e. Touch •Answer
Example #2:
Add 5% tax to $17.20
Do these steps
b. Enter 17.20
c. Touch EI
d. Enter 5
e. Touch II
Touch D Answer
,
twice
C/eE
b. Enter 3.95
i. TOUCh.
j. Enter 1
c.
Touch a
d. Enter 2.05
e. Touch II
f. Enter 3
g. Touch D
h. Enter 2.5
a. Touch
10. When adding and sUbtracting figures
with a
fixed decimal place this calculator
wilt hold that decimal place.
Example #1
The articles just bought cost $3.95,
2.05, 3.00, 2.50 and there is areturn
credit of $1.00. How much wHl the
bill be?
Do these steps display wilt be
k. TOUCh. Answer
20
21
'" :":, - .. -::.: c', ",'-';,", "',' --- - - - - .,,, _ "",' _. _ _' _-..-: .': c_ :'.>:':::::-,:,-,-:.":", ",':"-.-:_ ':.-'- >--:> __ .'-.-"'c'-:_''"" .. ,.-<'_'.\-,,'', '.' _"'" __ _ ._. '.,','_'.',_. ...• '." ,-
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, ".' , ; ..r, .",,'C",'.;.: __ :.'>' _;.'.">:::;,;,:;,,, .. ," :,', ',' .. ",
,',,' -' , ','. ',-, "" '. ""
ICs, Transistors, Diodes.
Height 1
V4 ", Width 3", Depth 5".
9 oz.
Switchable Charger/Power Supply.
Vinyl Pouch, Instruction Book.
Dimensions:
Weight:
Peripherals:
Main Elements:
Su pplementary
Elements:
SPECIFICATIONS
Decimal Point: Full floating decimal point.
Capacity: Addition, subtraction, multiplica·
tion, division. percentage,omni-
constant and
Memory: 6digits
in I8digits
out
General add, subtract. multiply.
divide and percent. Chain multi·
plication and division. Mixed
arithmetic. Constant multiplication
and division. Exponents,
fractions, reciprocals, and
Memory accumulations.
A.C. operation-115/230V,
50-60 Hz.
Battery operation -NiCd
Batteries (3)
5hour
operation
7 hour charge.
Large scale integrated circuil.
twice
C\CE
b.
Enter 14.00
Functions:
c.
TouchEi
d. Enter 7•
e. Touch
iI
f. Touch a
Answer
Power:
a. Touch
Example #3
Take 7% discount from $14.00
Do these steps display will be
•
•
22
23
, ''"'''''0-
''. __ ._ ..• , .... .' •. '''.,'' .... , .•. ;".--:':' ,,' .. ,',,,.,, .. ',.,-.-.. , ..- .. .-" .. "0< .. "_.,.,,',,","""
" -. "',' '. '.. -.'-- .-"',,, -- ",' ,"

, ,:,.-.'.' .. : .. :,'. ,'" ' .. ,' .. ,.". ' .. :.',' : "", .. , ..
NOTES
•
WARRANTY
Bowmar/ALI, Inc. warrants to the purchaser of
this new Bowmar Calculator that if the machine
or any part thereof in the judgment of Bowmar
is proven to be defective in material or work-
manship within one year from date of original
purcnase, such defects will be repaired or
replaced (at the Company's option) free of
charge for parts and labor.
This warranty does not apply to any product
which has been damaged by accident or which
has haen misused, abused, altered, or repaired
by anyone other than Bowmar_
This warranty is in lieu of ali other warranties
expressed or lmplied, and no person is author-
ized to assume for Bowmar any other liabifity
in connection with the sale of this product.
To obtain repairs. the Calculator should be
delivered, prepaid. to Bowmar/ALI, Inc. at
address shown below. In-warranty units will
be returned postage prepaid.
BOWMAR/ALI, INC.
531 MAIN STREET
ACTON, MASS. 01720
24
...... --.".,.,., .. -.~',-- ..
Printed in U.S.A.
.- _-'-
A 907 -021-0
16569