HP-67 not behaving?

[markhen]

Hi - I’ve had my “best” 67 in a drawer for a while and I decided to use it today after months (a year?). This machine was professionally restored about 10 years ago and is in mint condition. I popped in a battery and plugged it into an USB charge cable from TAS some years ago (that I have used with this 67 many times). It powers up but is not working properly. I hope it’s not dreaded ACT-itis (since my power source is 5V?). Here are the main symptoms (100% repeatable):

- display is permanently in SCI mode with DSP = 0 (only 1 digit of mantissa visible, decimal point, and 2 digit exponent)
- any numeric digit entry gives a display of “-x000000000. 00” (x = 0..9)
- stack lift ops (ex. ENTER) appear to correctly enter single digit into stack (without the minus or the extra 0s)
- arithmetic operators appear to work (single and dual operand) although display remains in SCI DSP = 0 mode
- stack can be rolled and remembers all 4 entries
- primary registers STO and RCL correctly
- PROGRAM mode shows “000” and nothing changes it (entries, SST etc)

Ideas????

Thanks

Mark