ThinkJet 2225B battery pack question

[Dave Frederickson]

Couldn't find a schematic, but here's an article that should help.
https://www.hpmuseum.org/cgi-sys/cgiwrap...i?read=563

Here's a pic of one of my battery packs showing the orientation of the six sub-C cells and the pico fuse.


Here's how the PCB is wired in the pack. It contains an input transformer, four diodes forming a full wave bridge rectifier, and a resistor whose color coding bands have fallen off. It measures about 5.5 ohms.


Here's a close up of the PCB.


And the circuit side.


No load output of the PCB is about 10.7 volts.

It's not mentioned in the article, but the original cells were 1200 mAh NiCd. The cells can be replaced with high-capacity NiMH cells but with capacities up to 5000 mAh they take a lot longer to charge. I use a Tenergy 1006 smart pack charger.
http://www.tenergy.com/01006

Also, new-formula ink cartridges are available.
https://www.hpmuseum.org/forum/thread-14...#pid130884


Dave