HP Integral : running ! Not...

[Joe R.]

At 11:09 PM 3/13/05 +0000, you wrote:
>>    There's some but I don't think it checks much other than making sure the
>> head is at the home position. When you turn the IPC on it runs the head the
>> right and then homes it. I think it only checks to see that it's at the
>> home postion when it finishs. I don't think it even checks for a non-home
>> position when it moves to the right. As far as checking for print head
>
>I am pretty sure it does. It moves the head to the right until it gets a 
>non-home position (and then a bit more), then restores to the home 
>postion. If the home sensor is playing up, the head will bang into the 
>side of the printer chassis (my first Thinkjet had a defective comparator 
>chip in the home sensor circuit, and did just that before I fixed it).
>
>> cable problems it does NOT check for anything. (Same for all the ThinkJets)
>> The obvious symptom is one or more missing rows of print but that can also
>> be due to a clogged print nozzle so you have to use a known good cartridge.
>
>The easiest test (assuming you can find the common connection on the 
>cable, which IIRC is pretty obvious) is to check the resistance between 
>the common connection and each of the others in turn with the cable 
>disconnected from the logic board and a cartridge fitted. It's very 
>unusual for the print cartridge elements to fail, so if you get an 
>'open' at the logic board end, it's likely to be the cable, alas. Of 
>course you can test the cartridge by checking for continuity between the 
>contacts on the catridge face.
>
>> they're almost certainly still good.  The other good news is the the
>> printer mechanism was designed by Canon (and perhaps built by them) and it
>> uses the same cartridges as the Canon Diconix printers so that gives you a
>> second source of cartridges.
>
>
>I thought that the Diconsix printers were Kodak, not Canon. 

   You're right. That was a brain fart.

The Thinkjet 
>electroncis (which is different to the DIconix electronics) is very much 
>HP -- the processor chip has a HOIL port built-in, it uses the Saturn bus 
>to talk to the RAM and font ROM (although I am sure the CPU is not a 
>Saturn), and so on. 
>
>I was under the impression, probably from HP journal, that the cartrige 
>was very much an HP invention. But maybe not.
>
>>   One more thing about floppy drives. HP made single sided, double sided
>> and quad density drives. The one in the IPC is DS. The one is the 9121 is
>> SS. I THINK the ones in the 913x and 915x are also SS so you can't use them
>
>The 9133H is certainly a DS drive (I use them). The 9153 uses a rather 
>different drive. 

  OK I wasn't sure. It's been a while since I played with any of them and I
know some are SS and some are DS. I think there's one or two combo drives
tht have QD floppies but I don't remember which ones. FWIW the QD drives
are easy to recognize since they have a BIG eject button and it's located
in the center.


It's still 600rpm, it's still a DS DD drive, it's still 
>Sony, but it's the later design with a 34 pin power/data cable and many 
>parts also used in the Mac 800K drive (!). It's the same drive unit in 
>the 9114B. 
>
>It would be _possible_, I think, to get that later drive in place of the 
>older one. But you'd have mechanical problems (at least in the Integral, 
>where the drive had no faceplate, the eject button slots into the front 
>of the machine itself), you'd have to make up a special cable. The older 
>drives are not that rare, it's probably worth finding one.

   HP 9122Ds and Ss are a good source. They seem to be common and are
inexpensive and you get TWO drives to play with.

  Joe


>
>Remember you can use one with a defective logic board or spindle motor. 
>All you need is the head assembly. THere are 2 logic boards used (IIRC 
>FC9 and FC16), they're basically interchangealbe, but you might want to 
>keep the one that was in the IPC originally. 
>
>-tony
>
>