Yes, HP rollers seem prone to that ;-(. I have an HP9820 calculaotr where the internal printer platten roller had turned to goo and dripped onto the printer driver board, and even onto the main backplane at the base of the machine. Cleaning it up took nearly as long as making a replacement Getting back to your machine, is this a normal cylindrical roller, or does it have a flat on it or something? Thanks to recomendations on the MoHPC froum, I'ce found that 3M 'Cold Shrink' is a suitable material to make cylindrical rollers from. Put it on in layers (don't pull too much of the 'core' out). It grips well. That's what I used for the platten I mentioned. Before I was alerted to this product, I had conisdered casting my own roller using one of the 2-pack elastomers, like Devcon 90. The basic procedure is to make a mould, coat that with the release agent, coat the spindle with the primer, then mix the 2 parts of the elastomer and pour it in. The main problem ia that you're supposed to mix the entire elastomer kit in one go, once mixed you have 30 minutes to pour it, and you have to wait overnight before taking the part out the mould. Thus, yo have another go (something that I was sure to need to do), you'd have to use a new kit, and that gets expensive fast (I found that an elastomer kit + primer + release agent was going to cost over \pounds 100.00, the kit alone was over \pounds 30.00...) But of course you can make rollers of just about any shape that way, including oens with flats, steps, etc. I would have been more likely to give that a go if I'd had someody local who'd used said product (even if not for repairing classic computers :-)) who could have told me 'No, pour it more slowly' or 'You'll never get that mould to fill evenly' or whatever. http://www.hpmuseum.net? The site you mentioned is for handheld calcualtors mostly. -tony

www.hpmuseum.net the other one is David Hicks HP calculator museum ;-) Both very good sites. Would it be possible to use an old roller from a laser printer and make something working from it. The rubber used on the transport rollers is made for this kind of purpose. Removing goo cna be done with hot water, the stuf gets fluid and you can wash it away. After that you can dry your parts in a hot air oven at 60C. -Rik -----Oorspronkelijk bericht----- Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] Namens Phil Budne Verzonden: donderdag 26 juni 2008 17:17 Aan: cctalk at classiccmp.org Onderwerp: Replacement "pick" roller for card reader I picked up an HP7260A table top card reader, with the aim of restoring it to working condition. The major problem has been that the "pick" roller that moves the card out of the input hopper and through the first gate had melted into a pile of goo, ending up in a puddle in the output hopper. I only had to sacrifice four blank cards (hand fed) before getting one to pass thru the rest of the transport almost entirely unblemished(*). So far the control/sequencing circuitry seems to be working, but I haven't checked yet if any data is comming out the serial port. Thanks to the HP Computer Museum (www.hpmuseum.org), I found the maintenace manual, and an image of what the roller looked like (#48 in the image below): http://www.ultimate.com/phil/roller.jpg I used one of these readers when I was in High School c. 1978. Before finding the maintenance manual I had no memory of what the roller looked like, but it must have been something soft, with a lot of gripping power. Any suggestions (short of attempting to cast a replacemnt out of melted gumi candy)? The axle is a quarter inch or close, and roller needs to be at least a quarter inch thick. I'm tempted to drop in on a local rubber products company (Greene Rubber, in Woburn Ma), but knowing what to ask for would help! Thanks in advance for any suggestions. Phil (*) One pinch roller inside was slightly gooey, and still gives off blackness, no matter how many times I clean it. The pinch rollers all have a flat spot from having sat for many years, and I might try to replace them with O-rings, but it's not the top priority.

Phil Budne wrote: I have one of these with exactly the same issue. Do you have the weight to put on top of the cards? Mine came without, and I'd be interesting in making or obtaining an working replacement. I've not started on it yet, so my card tray is still full of melted goo. -- Tim Riker - http://Rikers.org/ - TimR at Debian.org Embedded Linux Technologist - http://eLinux.org/ BZFlag maintainer - http://BZFlag.org/ - for fun! ? ? ????????u poo? ??n??u??s ?no? u? 8-??n s? ? ?