Re: Suggestions for making an HP9810/9820 printer platen Message #15 Posted by Tony Duell on 15 Feb 2007, 7:16 a.m., in response to message #14 by Katie Wasserman
The diameter of the (good) platten in my 9810 printer (exactly the same mechanism) is 0.85". I've checked this with a micrometer, and I don't believe I am 30 thou out :-). I suspect the exact diameter is not that critical, though.
The is one possible problem. There's a (red) paper guide flap under the platten, the paper feed key presses on an extension of it's pivot spindle (the flap the lifts the printhead off the paper which, in turn, operates a microswitch on the front of the machine to start the drive motor).
The only way to assemble the front section of the printer is to put the flap in upside-down and then turn it through 180 degrees to get it to the right position. Part of the flap has to be forced past the platten. If the platten 'core' is too large a diameter (with, therefore, a thinner rubber sleeve over it), this will not be possible. A quick measurement (ruler, nothing fancy) suggests a clearance between the flap and the platten spindle of 0.25", so you have to be able to reduce the platten diameter at that point by about 0.1 ". The last thing I want to do is make up all the parts and find I can't actually assemble the thing!
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