In the case of this later SP1, taking apart the platen frame is a piece of cake. 1. Remove the platen knobs. 2. Loosen the screw left of the platen, that hold the platen to the central rod that runs through the platen. 3. Pull the rod out and lift the platen from the frame. If necessary, apply some penetrating oil to loosen the rod.
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Important: As work on this particular machine started, we discovered that the construction of the platen frame on this machine (serial# 29123) is different from that on earlier SP1's. This one is identical to the platen frame on the SP2.
Check the bottom of this page for instructions on how to disassemble the earlier versrion of the platen frame.
Next, what I did with this part of the machine was: - disassemble paper holders and other parts. - remove dirt with some solvent and polish. - remove surface rust with Unipol metal polish (this is ammonia holding polish). Brush carefully with a brass brush to remove rust. - restore the shine with polishing compound and a cotton
polishing wheel on the Dremel. - touch up the paint on the paper tray, using standard black metal lacquer. - polish and clean the platen with thinner. - reassemble. The pictures on this page tell the whole story. They show the different parts before and after. As you see much of this machine can be brought back to a more or less acceptable state.
These instructions for disassembling the platen frame cover earlier SP1 models:
Remove the platen frame from the carriage. Remove the pins that secure the platen shaft to the framework. The platen and the shaft can then be removed. By removing one screw in the right frame the paper table and feed roll can be removed. Remove the pivot screws in both ends of the feed roll.
This is way to remove tapered pins: First determine which is the smaller diameter end. This is the end to strike. Place a backing block of some sort underneath the shaft or frame that the pin has been driven through and as close to the pin as possible. Use a punch with a surface much larger than the pin and while holding it against the small end of the pin strike the punch very sharply with a hammer. This should loosen it in most cases and then you may use a drift punch to drive it on through. Do not use tapping blows because you may only rivet the pin in place. Some times punching may not be successful and drilling may be the only answer. If anyone out there has a better method please join in.