HP Integral PC Manuals?

The printer is a normal thinkjet. Well, normal-ish Thinkjet. It uses the same 'printhead' (ink catridge), etc. I ahve no idea where you'd get one The main difference between the Integral and a normal Thinkjet is the relative positions of the mechanism and control PCB. The control circutiry is on the Logic B PCB, which is on the front side of the main chassis plate, behind the display. The PCB you see when you take the back cover and rear screen plate off is Logic A, that's parallel to Logic B on the other side of the chassis plate. Anyway, the circuitry is standard (it's the HPIL version of the microcontroller, but arranged for a mains PSU (oviously), but the different layout means that the cables between the mechanism and the PCB connectors are longer in the Integral than in a noraml Thinkjet. This is a minor prolem with the motors (the wires are integral to the motor, but if you had to replace either motor with one from a normal Thinkjet, you could cut the wires fromt he old motor at a suitable point, cut the connector off the repalcement motor, and solder/heatshrink the connections. Anyway, motors rarely fail. The problem is the flexile PCB that links the carriage to the PC, and whihc carriws the printhead signals. It's longer than a normal one too, and those _do_ fail, particualrly if th ink cartridge leaks onto it (at the front of the carriage), and it's left in that state. Replaceing it is not too hard if you can get the part, but kludging in a normal-length flexiprint could be 'interesting'. If you want to get the printer mechansim out, you have to remove the logic PCB chassis first. As part of that you unplug all the cables from the Logic B PCB, including all the Thinkjet mechanism ones. You don't need to remove the PSU/backplane box. With the logic assembly out of the way, you remvoe the RH (lookin from the front) spaceer at the top to free the grounding tail on the Pritner control panel (if you don't do that, you _will_ tear said tail), then unto the obvious screw and take the control panel out. THe PCB is the stnadard Thinkjet one, the wires are, again, longer. Then I think it's 3 screws that hold the mechanims in place, with those out it just lifts out. The mechanism is overhauled like a normal Thinkjet one. I don't know if the Thinkjet service mnaula is on the web anywhere, I have it on paper (but as ever, no scanner). If you want to tkae it apart, I can talk you through it. Much of it is biouv (but there are some tiny dowel pins that drom out and get lost if you're not expecting them). You need a good set of Torx driers. Basically, I do it in the following order (I think). At the back, take off the carriage motor, home sensor and paper-out switch and actuator (the latter has a magnet that operaates the reed switch). Take off the cleaning pad holder Take off the cover on the RHS, then the platten motor Take off the paper bail (E-circlips at each end, there are dowel pins here that fall out). Take the rollers off that. If necessary, remove the torsion springs and the bail support arms Take off the platten gear, then the E-circlik at the other end and the 2 bearings. Lfit out the platten and take the parts off the shaft -- when reassembling, you have to line up the sproket teeth, of course. Then take out the paper guide 'basket'. To remove the cariage, first undo the screw holdign the drive cable to it. There's a plastic washer on the screw to hold the cable in place -- make sure that's fitted and thusthe cable is not going to unwind. Then free the flexiprint from where it's lightly glued to the chassis, take out the carriage rails (E-circlips) and lift out the carriage The carriagel comes apart (although HP don't recomend it). The bottom secion can be freed by frobing the locking part and sliding it free. Then there are 2 little plastic clips that hold the flexiprint to the front part of the carriage, with those removed you can fold the flexiprint and feed the end throug the carriage slot. IO have never tired to remove or replaec the carriage drive wire and gearbox. HP claim that's not field-repairable. I suspect special clamps, etc are going to be very useful, one day I will give it a go (I have at least one THinkjet with a wrecked flexiprint that I'll experiment on). It's worth remembering if you do this that if you refit the carriage motor, you can lock the motor, and thuse the mechanism connected to it, but passing a suitable current trhough one of the windings. That would prevent the pulley from turning, for example. [...] I guess I'm justa curious hardware type, I like to see what goes on inside all my classic computers :-) The RS232 card has an interesting undocumented feature that AFAIK no software supports (but I would like to be proved wrong). It's acutally a _dual_ RS232 port. The 68681 chip used on said PCB is actually a 2-channel device. The second channel is uffered to RS232 levales and wired to the seocndary ('back') channel pins on the DB25 conenctor. I think things like SRTS are wired up too. Well, a hard disk would have got round that problem :-). -tony