HP Forum Archive 17

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comparing early flex circuit vs late rigid circuit series30 calculators Message #1 Posted by Which Dr. on 7 July 2007, 10:47 p.m. Hello, I am new at this HP calculator world. Here is my first question: can anyone tell me how to tell which version of the HP-38C series I have without taking off the back cover and cking? i.e is it the early (flex circuit) or late (rigid circuit) series 30 calculator that I have? Perhaps you can you tell by the serial number if it is an early version or not? Thanks in advance for any info!

Re: comparing early flex circuit vs late rigid circuit series30 calculators Message #2 Posted by Hal Bitton in Boise on 8 July 2007, 9:56 a.m., in response to message #1 by Which Dr. Hello, The earlier flex PCB 30 series machines had 2 distinct caracteristics: 1. They were rather heavy, as they had a steel plate inside to back up the flexible circuit boards. 2. The key detents were VERY firm with long travel (they used plastic snap domes). One more thing Because the flex circuit board machines were solderless, they were prone to having display segments blank out occasionally (a little twist on the housing usually brings them back). Hope this helps. Best regards, Hal

Re: comparing early flex circuit vs late rigid circuit series30 calculators Message #3 Posted by Etienne Victoria on 8 July 2007, 10:31 a.m., in response to message #1 by Which Dr. Hello, If weight=220 g or 7,76 oz => early version with pressed components. If weight <= 220g => latest version with soldered components. Best regards Etienne

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