[Elecraft] Voltmeter lost after converting XC control board to support KIO2

[Ron Hahn EI2JP]

Lads,

I have one of the field test K2s (SN 79, current 2.04 firmware) that  
I've recently added a KIO2 board to.  To do this I needed to perform  
the mods for the XC control board to make it compatible with the KIO  
2 (which I have done).  This included cutting one trace to the MCU  
pin 25, adding two new jumpers and a .001 cap.

After performing the mod (and checking my work twice) I installed the  
KIO2 according to the instructions.  Changed the sidetone, checked  
the voltages, and even ran the test sequence with Hyper-terminal.   
All worked OK.  Radio works fine with TRX manager, which is also good.

My problem is that I have now lost the voltmeter, although the  
ammeter works.  So, consequently, I get LO BATT reminders every so  
often and the volts/current display shows 0.00V 0.3A.  !

Every other aspect of the radio seems to work EXCEPT the voltmeter.   
I checked for shorts, bridges, etc.. and could not find any.

Can anyone steer me in the right direction as I'm now at  a loss as  
to what I could have done to break this feature.

K2, Sn 0079, Firmware 2.04, XC control board
K160RX
KAT2
KBT2
KDSP2
KIO2
KSB2

Thanks for the help.

Ron EI2JP