I have an Officejet D135 which is about 5 years old, but very serviceable. Lately it has developed a problem with replacing cartridges; what is supposed to happen is that you open the machine by lifting up the front, and the carriage that holds the cartridges and printheads is supposed to slew to the center and let you replace cartridges or heads. Unfortunately, it no longer does this, so you can't get the empty cartridges out to replace them with resorting to heroic measures.
I called HP tech support, and they instructed me to unplug it, wait a while, plug it back in, and maybe the carriage would come out. Sometimes this works, but most of the time it does not. Their advice was to buy a new All in One (from HP, of course). It seems that in their view, this machine is so obsolete that even the one that superceded it is obsolete! Sorry HP; I like what I have and want to keep it running!
I took a careful look at the mechanism, and there is this little gizz on the right side, just below the shiny rod that the carriage slews on, which blocks the carriage. I discovered that I could power up, open the access door, manually push this thing back in, and the carriage would dutifully slew out and let me replace cartridges. What I would like to find out, is exactly what this mechanism is, how it is put together, and how to make it work like it originally did. This may be one of these "tear it apart and clean out the crud" operations, or perhaps a "replace C164 on the fubar board", or something else. Does anyone out there understand this machine well enough to help me out? Does anyone know where one can get a technical service manual for this machine (I'm an EE and am not afraid of this kind of thing).?