Posts: 4
Threads: 1
Joined: Jan 1970
Hi Michel,
i made positive experience with the following advice I found somewhere here in an archive:
open the calculator (6 screws), remove the printer carefully (3 screws, lift the attached small pcb) and clean the pin rollers using Q-Tips and isopropyl alcohol (also called isopropanol, available in drugstores / pharmacies).
Be careful when reassembling: do not bend the contacts when attaching the small pcb again; and do not stress the flexible ribbon pcb.
Hope this helps,
Robert
Posts: 1,788
Threads: 36
Joined: Aug 2007
If cleaning the drive rollers does not help there are a few other things to try:
1) Try using a substance called Rubber ReNue (sp?) from MG chemicals. It contains methyl salicylate which softens rubber and makes it sticky. Similar products are sold for use on slot car tires. Keep it off the plastic parts... it will melt them. It helps to use the printer regularly... otherwise the feed cam will harden up and develop flat spots again.
2) With a lot of fiddly work and great care you can remove the feed cam (hint: you first have to remove the print head) and then gently sand the flat spots off the rollers. Then roll the cam rollers back and forth across coarse sandpaper (like 80 grit). Keep sideways tenstion on the cam so that the clutch teeth are kept apart. Clean the rollers with alcohol and/or Rubber Renue.
3) Replace the cam with one from an 82143A printer. Same fiddly mechanical work as above times two... be evry careful reinstalling the head... it can be cracked very easily if it is not seated properly when you tighten the screws.
Posts: 1,322
Threads: 115
Joined: Jul 2005
i had the same problem with a former bosses 82143 and it just had a lot of dried lubricant and dust clogging it up. the cleaning that RB mentioned was all that was needed for it. i put a little triflon on all the gear-ish parts afterward and it worked fine. if i wuz u: i'd try this first to see if it works before david smiths more serious treatments for more serious ailments.