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UNDERWOOD   MODEL 300 R



... Observe the home-made (female) power plug - Details below ...

Have a Look at AN OLDER VERSION

TECHNICAL   D A T A   of  the  Electro-Mechanical  Printing-Calculator
**********************************************************************
Model = 300 R                                            UNDERWOOD 7/8
 
Serial Number:       5192857

Dimensions:   (ca.)  Width   =   8    " /  20 cm
                     Depth   =  13_1/2" /  34 cm
                     Height  =   5    " /  13 cm

Weight:       (ca.)  10_1/2 lbs  /  4.8 kg

Power Supply:        220 V AC / 35 W , grounded

Mechanics:           Serial-to-parallel Conversion,
                     10-Block-Keyboard

                     Black/RED Nylon Ribbon (= Typewriter):
                     1/2" * 16'  /  13 mm * 5 m
                     ( Spool-Diameter = 1_1/2"  /  40 mm )
                     Paper Roll (Standard):
                     2_1/4" * 2_3/4" * 165'  (W * D * L)
                     57 mm  * 65 mm  * 50 m  (B * D * L)

Functions:           Add, Subtract,
                     NonAdd, Repeat, Subtotal, Total

Registers:           Input       =   7 Decimals
                     Arithmetic  =   8 Decimals
                     Printing    =  10 Characters
Manufacturer:
                     Made by OLIVETTI
                     Ivrea / Italy
                     1970

HOW TO USE  the  UNDERWOOD  » 300 R «
*************************************

ENTER A NUMBER:
---------------
The actual number of digits entered shows on the window beside the
keyboard. If wrong digits are entered, pull the lever [ -> ] to
delete the figures digit-by-digit. When pressed [C] the whole input
will be deleted.

ADDITION & Subtraction:
-----------------------
Everytime a number is entered and the keys [+] or [-] are pressed,
the number is printed and added/subtracted to/from the memory.

REPEAT:
-------
To enter the same number more times, pull the lever [X] before the
key [+] or [-] are pressed. The keyboard will not be cleared after
the printing & calculating cycle.  Release lever [X] before
the last [+] or [-] cycle.

NON-ADD:
--------
Enter the item number and press the key [ < ]. This item number is
printed, but it is not part of the addition/subtraction cycle. 

SUBTOTAL:
---------
The cumulated sum will be printed when the upper lever is pulled
to [S]. The memory will hold the actual sum.

TOTAL:
------
The total sum will be printed when the upper lever is pressed
to [T]. The memory will be cleared.

CHANGING THE PAPER ROLL:
************************
Pull the holder clips on both ends and lift the paper roll.

CHANGING THE RIBBON:
********************
Open the black metal cover and observe how the ribbon is spooled!

PRINTOUT - Example          with Comments:
******************************************

^^^^^^^^^^^^^^^^^^   To clear memory:
|          00 T  |   Press [T=Total]
|                |
|                |                 < Max.Input = 7 decimals > 
|   76.543,21    |   Enter (1st) number, Press [+]
|   65.432,10    |   Enter (2nd) number, Press [+]
|  141.975,31 S  |   Pull [S=Subtotal] to print sum [in RED]
|                |
|        1,23  - |   Enter (neg.)number, Press [-]
|  141.974,08 S  |   Pull [S] to print cumulated sum [in RED]
|                |
|        4,56    |   Set [X=Repeat], Enter number, Press [+]
|        4,56    |   Release [X], Press [+]
|  141.983,20 T  |   Press [T] to print total sum [in RED]
|                |                < Max.Output = 8 decimals >
|                |
|          00 T  |   Press [T], Memory is clear [in RED]
|                |
|          47 <  |   Enter ID #47, Press [< =NonAdd]
|    6.789.00    |   Enter value, Press [+]
|          11 <  |   Enter ID #11, Press [<]
|    5.432.00    |   Enter value, Press [+]
|   12.221.00 T  |   Press [T] to print total sum of values [in RED]
|                |   
|          00 T  |   Memory is clear [in RED]
|                |
|       12.00    |   Enter number
|       24.00  - |   Enter (larger negative) number
|       12.00 T- |   Negative sum [in RED]
|                |   
^^^^^^^^^^^^^^^^^^

INSTRUCTION IN GERMAN in  http://www.rechnerlexikon.de ...

R E M A R K  ( A )          HOW TO OPEN THE COVER FOR MAINTENANCES ???
======================================================================
(1)  Pull the paper out - Flip the adding machine on its top
(2)  Pull out the bottom bowl - It is resting inside the feet
(3)  Bent back the tongue on front, holding a nose of the cover
     ( H I N T :  Do  NOT  bent it back after assembling !)
(4)  Flip back the adding machine
(5)  Pull the plastic cover over the keyboard - Push it backward
(6)  Remove the cover
(7)  Now there is access from all sides ...

R E M A R K  ( B )            HOW TO GET THE RIGHT »OLIVETTI-PLUG« ???
======================================================================
It was not possible to get the original  »OLIVETTI-PLUG«.  Because the
(male) contacts are an integral part of the motor unit ( see Picture )
it would be necessary to destroy it to mount a permanent power cable.
Pictures below show snapshots of the procedure to make a functional-
equivalent (female) PLUG with "Angle-Power-Cable" by myself ...



 

impressum:
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© C.HAMANN      http://public.beuth-hochschule.de/~hamann     11/11/14