ThinkJet 2225B battery pack question

[hfischer]

Hello,

I just successfully re-activated a 2225B ThinkJet hp-il printer - the only issues were an internally corroded on/off switch (disassembled, cleaned, working) and a dry print head (alcohol didn't help, hot water did). The complete disassembly of the device thus wouldn't have been necessary, but was instructive :-)

The printer came with a modified battery pack, which contains rectifier, capacitor and voltage regulator, all on a rather hand-made looking raster board. It is fed from an external W&W-labeled transformer, a bit larger and much heavier than the usual hp power supply, but with an original hp connector.

The printer runs nicely on this supply, but I might consider rebuilding the battery pack. Is a schematic available somewhere?

Thanks in advance,

Helmut (Germany)