George, I think we already have the document you are referring to and this is the same document on xdevs server and ko4bb.
I am slowly progressing with the project.
I started with power supply. Taking it apart was not difficult. Under metal shield I found a toroid transformer, generating 5 isolated 26V outputs plus another line out of about 11V. Here are few quick pictures. I will take high resolution photos and post them later on.
This is my current understanding of pinout of connectors coming to battery compartment. Please note that I numbered pins in a way how they correspond to pins on IDC connectors on power supply board. This is not a standard numbering for DB9 and DB15 connectors.
There are 5 channels of batteries with 3 batteries in each. Each channel has a 10k thermistor at positive terminal of the first battery (all connected to DB15 connector). First channel also has a thermistor on negative terminal of the last battery. I have not traced how it is used yet. Solid dots on DB9 diagram are negative terminals for each of 5 battery channels.
Without service manual I was not really sure what to expect for power output from supply. There are two output power IDC connectors on power supply: 10 pin and 16 pin.
For now I recorded all pairwise voltages between them:
20 VDC is directed at charging each battery channel. 24.5 VDC is actually 4.5 VDC relative to 20 VDC that comes to each thermistor. So far this makes sense. However areas in yellow look a little bit out of the pattern to me, so this is what I will be investigating next. I want to be sure the power supply is not going to destroy something before I move further.