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Texas Instruments TI-EC7 Pro

Date of introduction:  July 2007 Display technology:  LCD
New price:  17.59 Display size:  12 characters and 12
Size:  6.5" x 4.5" x 1.1"    
Weight:  5.4 ounces Serial No:  
Batteries:  CR2032 Date of manufacture:  mth 02 year 2007
AC-Adapter:   Origin of manufacture:  China (N)
Precision:  12 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

The TI-EC7 Pro+ replaced in 2007 the TI-EC7 Pro introduced only one year earlier. 

At first glance the only changes are a new up-to-date design but Texas Instruments addressed the owners of the original TI-EC7 Pro with an important product update:

EC7 Pro Product Update

We have recently become aware of a computational issue with the EC-7 calculator. This does not affect the EC-3 or EC-5 models, or any of TIs other calculators. When inputting figures less than 1.0 on the EC-7, you must input a zero before the decimal. Otherwise the answer will be incorrect. For example, in the EC-7 100 .5-.5 = 100; 100- 0.5-0.5 = 99.

For more information, please contact our customer service center at:
Texas Instruments
Education Technology,
800 Pavilion Drive,
Northampton, NN4 7YL
Telephone: 020 8230 3184 

( 2007: http://education.ti.com/educationportal/sites/UK/nonProductSingle/ec7pro_update.html)

TI-EC7PROPLUS_PCB.jpg (269550 Byte)Dismantling the TI-EC7 Pro+ reveals a printed circuit board (PCB) 100% identical with the TI-EC7 Pro and we assume that the fault was corrected by a software update of the single-chip calculator circuit hidden under the small black epoxy-resin blon.

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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, August 12, 2007. No reprints without written permission.