HP97 The journey begins
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03-26-2019, 01:23 PM
(This post was last modified: 03-26-2019 01:25 PM by wallyt.)
Post: #44
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RE: HP97 The journey begins
After getting the card reader working (new pinch roller and clutch) I decided to repair the printer on my HP97. The printer would not advance the paper even though the gear train was in fine condition. I suspected the problem was in the condition of the two pinch rollers.
I was not brave enough to disassemble the printer enough to replace the two paper feed rollers so I elected to try a somewhat less invasive method. I first very carefully cleaned the two rollers in situ with a cotton swap and isopropyl alcohol. I then applied to the circumference of both rollers two wraps each of 1/8th inch wide automotive pin striping tape. The width of this tape is nearly a perfect match for these rollers and the tape is durable enough to withstand application on a car body. Working slowly and carefully I was able to do this without disassembly of the printer. As this tape has a very shinny surface, for good measure I carefully applied small amounts of Krylon Matte Finish spray coating, using a very tiny brush, to the surface of tape on each roller. Again, one must do this very slowly, applying the coating to a small area and allowing it to dry before moving on. To facilitate rotating the rollers while I applied the tape and Krylon I left a length of paper about one foot long in the printer. When I needed to rotate a roller I would gently pull the paper up through the printer an inch or so at a time. After reassembly of the calculator I was very pleased to see the printer work as it should. I realize that the best fix would be a complete replacement of the pinch rollers but what the heck...we'll see how long this lasts! |
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