And... still fails. Maybe I was hearing things. I put the unit back together did a couple of calibrations, and it still gives the solenoid error. Swapped batteries, repeated, no joy. Verified again that the solenoid works putting DC against it. Verified that no voltage was coming down the wires to the solenoid. Felt for breaks in the wire (none).
I still don't know how the unit knows the solenoid doesn't work. As it's a digital signal that goes down through the divecan, something needs to send back that it didn't work. I guess that's the SOLO board in the battery box. But, that same box also must measure DC voltage of the Ext Battery, which does show up in the NERD (via digital divecan connection) so it must be alive and talking. Obviously it was because the firmware took and shows up in the BUS devices. I tried putting a resistor against the battery box thinking that maybe it needed a resistance before it would send a voltage, but that didn't work either.
Richard's recommendation was to find someone else with a Divecan controller to eliminate if it was the Nerd or the Revo battery box, but I don't know anyone with a unit in the Raleigh NC area- and my dive partner at the coast has an analog controller.
I still don't know how the unit knows the solenoid doesn't work. As it's a digital signal that goes down through the divecan, something needs to send back that it didn't work. I guess that's the SOLO board in the battery box. But, that same box also must measure DC voltage of the Ext Battery, which does show up in the NERD (via digital divecan connection) so it must be alive and talking. Obviously it was because the firmware took and shows up in the BUS devices. I tried putting a resistor against the battery box thinking that maybe it needed a resistance before it would send a voltage, but that didn't work either.
Richard's recommendation was to find someone else with a Divecan controller to eliminate if it was the Nerd or the Revo battery box, but I don't know anyone with a unit in the Raleigh NC area- and my dive partner at the coast has an analog controller.