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15c LEs Replaced



#2

I just received my replacement 15C LEs for the two I had given to HP to evaluate at the last HHC. The original units had bad keys. These new units are S/N 13841 and S/N 13802. Their firmware version is 2011-04-15 which is still current I believe but I'll check with my other units.

Merry Christmas,

Gerry


#3

It's the same firmware.

#4

Glad to hear it. It looks like they scrapped the original production past LE number 03000, and started a new production run with 13000. What are your serial numbers ? That will give an indication of when they were produced. Do the keys feel any different on the new ones ? Are the f (yellow) and g (blue) shift keys loose or do they rattle ?


#5

The serial numbers are 13802 and 13841. There's also a second tag on each unit, CNA1410BK0 and CNA1410BK3 in the upper right of the back of the units. If they are part numbers, I would think they should be the same, but they're not. The two units look and act identical. What do these numbers mean?

Gerry

P.S. I forgot to mention that the keys feel the same as the first batch of 15C LEs including the f and g keys which wobble a bit, but that doesn't bother me.

Edited: 9 Dec 2011, 8:56 p.m. after one or more responses were posted


#6

Those are the true serial numbers. The CNA is the factory code, the first number is the last digit of the year (2011), the next two digits is the week number (41) in which they were manufactured. So, they were bother manufactued in the 41st week of 2011, which would be mid October. The last four digits are lot codes. The Limited Edition numbers are not serial numbers.

The serial numbers for the original production units that I bought all indicated manufacturing dates in the 31st or 32nd week of 2011, which was in August.

Edited: 9 Dec 2011, 7:08 p.m.


#7

My LE Number is 02720 with Manufacturing Part Number (actual serial number...?) of CNA 1310L1B. Therefore, it was made in the 31st week of 2011.

The unit, with the exception of the slightly wonky shift keys, seems fine. What are the chances that it has as yet undiscovered faulty keys or some other problem, being part of the original batch? Would the firmware version of all LE units released to date - old and new - be 2011-04-15? How can I tell? Where is the Checksum indicated? I take it replacement units have the PSE bug also.

My very first HP calculator was a 15C S/N 2237AXXXXX. This new one is very fast - e.g. Valentin's third double integral example in his "Long Live the HP-34C !" article (a must have like all of his other articles), takes some 17 minutes on the 34C and not much faster on an original 15C, but computes to at least 6 significant digits in a mere 6 seconds on the 15C LE.

The HP 15C is, in my humble opinion, the best pure RPN calculator, with all functions readily accessible from the keyboard, ever made.

Jeff Kearns


#8

The firmware date and checksum are indicated by running the second self-test, i.e. calc off g ENTER ON then release ON g ENTER, then press 2 followed by any key repeatedly until you return to the main menu, then ON to exit and turn the calc OFF. You can also test the keyboard by pressing 3 in the main menu, and then pressing every key in any order at least once to turn off all segments on the display. If your keyboard works properly, then it's unlikely you'll have any problems. Mine has worked perfectly for 3 months now, and I've used it nearly daily.

#9

Quote:
I just received my replacement 15C LEs for the two I had given to HP to evaluate at the last HHC. The original units had bad keys. These new units are S/N 13841 and S/N 13802. Their firmware version is 2011-04-15 which is still current I believe but I'll check with my other units.

Merry Christmas,

Gerry


Do the new units have better keyboards?

Merry Christmas, Gerry


#10

Hi Eddie, The keyboards feel the same as the original ones. I didn't notice any difference. The F and G keys still move around a bit but I don't find it to be a problem.

Gerry


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