Minus-sign on HP34C



#2

Hi there,

I just made a weird discovery: the mantissa of my HP-34C shows negative values with a precessing dot (the one which shines bright, wenn BAT's low), not with the standard horizontal dash.
I have no manual, couldn't find anything in the MoHPC and have currently no access to my MoHPC-CDs.

Could anyone tell me whether this is a feature or a bug? Is the LCD going where only LCDs go? It sure has one or the other segment not working, but this has proven to be a reliable state.

The exponent's minus sign works, though.

Clues?

Thanks
Klaus.


#3

First, it isn't a LCD, it is LED! To some people this is blasphemy! :D

If the red dot that shows the low bat lights together with the minus sign, I think that it can be a bad contact or misaligned contact on the display pins - if your calc is that "solderless" version.

Best regards,

Nelson


#4

Phew, what a BAD BAD slip. Spent to much time mesmerising my 41...

They seem hard to open (at least the people say), so I won't venture this, but as there are funny effects, when I twist ist, this points towards the solderless type.

Again: the minus sign doesn't light at all! When typing in "2 ENTER 3 -", I get ". 1" (the dot being in the upmost quarter of the Light Emitting Diode :-) Display. No MINUS sign at all; same goes with "1 CHS": gives ".1"

I take from your answer, that HP provided the classic dash for negative numbers...

Hmmm...


#5

Yes, there is a normal -ve sign on the Spice series, and yes, I think your problem is bad contacts to the display, particularly if this is the solderless version. This is a very common problem

Spice series machines are not hard to open. The procedure has been given here many times, and once you've done a couple, or seen them being taken apart, there's no worry at all.


Possibly Related Threads...
Thread Author Replies Views Last Post
  A new product of Spee Dee Sign d;-) Walter B 180 7,901 12-01-2012, 03:29 PM
Last Post: Richard Ottosen (Denver, CO, USA)
  HP 67 Calculator Battery Terminal plus/minus Steve E. 6 406 04-30-2012, 03:29 PM
Last Post: Nick R
  55 already registered for HHC 2011 in San Diego! Sign up today Gene Wright 7 523 07-26-2011, 02:04 PM
Last Post: Jim Yohe
  RPN hp20s and lcd hp34c proposals Jose Poyan 11 668 04-29-2011, 08:17 PM
Last Post: Scott Newell
  The equals sign again BruceH 0 150 08-25-2010, 02:13 PM
Last Post: BruceH
  70% of US students don't understand the equal sign DavidShenk 48 2,562 08-22-2010, 10:00 PM
Last Post: John B. Smitherman
  Sign of a new HP calculators prices inflation? Xavier A. (Brazil) 9 595 03-01-2010, 07:07 AM
Last Post: Xavier A. (Brazil)
  Odd sign problem with HP-97 Dan W 0 164 07-15-2009, 09:05 PM
Last Post: Dan W
  HP34C Black Scholes Model Ed Austin 2 231 05-18-2009, 07:40 PM
Last Post: Ed Austin
  HP34C Manual - 30 years ago Ed Austin 12 1,041 11-20-2008, 05:19 PM
Last Post: Ed Look

Forum Jump: