I have two HP-41CV calculators with surveying pacs that I have used for many years (trouble free). Recently, one has been not clearing properly. When you attempt a routine: press the gold shift key, then press the clear x/a key, instead of the display showing 0.0000, it shows "DSP BRG?" This calculator otherwise appears to perform all other related (surveying) functions properly. I wondered if anyone has ever experienced this problem and if so, if they might have any ideas regarding a repair solution? If so I would appreciate if that someone would consider sharing same with me. Thank-you.
Tom Storino