HP Forum Archive 21

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HP-34C Draining battery quickly Message #1 Posted by Bill Crowell on 7 Sept 2013, 5:10 p.m. Any assistance is appreciated! I purchased a "mint" 34C from ebay and have found that it empties the battery overnight. I've put in 2 replacement packs with the same results. To ensure that the packs were fully charged, I've used a 3v precision charger to charge them and then inserted into the unit. It runs fine, but I power it off, come back in the morning and the battery is DEAD. The reason for external charging was to take the 10VAC charger out of the equation. I've searched for a schematic. I'm wondering if there is a diode shorted somewhere in the power circuit. I found a technique here to open the case using a piece of string, but this does not fully expose the circuit board. Not wanting to make things worse, I've decided to post this question before proceeding.

Re: HP-34C Draining battery quickly Message #2 Posted by Jeff Kearns on 7 Sept 2013, 7:50 p.m., in response to message #1 by Bill Crowell This link: Spice Repair - Voidware is what you are looking for if you decide to access the circuit card. Jeff Kearns

Re: HP-34C Draining battery quickly Message #3 Posted by aj04062 on 8 Sept 2013, 8:30 a.m., in response to message #1 by Bill Crowell This could possibly be caused by some corrosion that has bridged between + and - That is a guess on my part. I've been pretty successful getting the case apart with an old credit or Plastic ID card. The thinner the better.

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