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Mostly rechargeable batteries don’t survive decades. The batteries in this PC-1500 were no exception. Fortunately they were not leaking, but the capacity was zero. The photo shows the original battery containing 5 AA NiCad cells. I replaced them with NiMH cells with much higher capacity. As a consequence the charging time is a lot longer.
The yellow arrow in the left photo is pointing at a small plastic gear. Plastic components shrunk around metal often show crack. In this case the gear was not able anymore to rotate the connected larger gear. Luckily I found a brass gear on the website of a German hobby shop. Given its measures and number of teeth it seemed almost identical to the existing plastic gear. After widening the hole a bit I attached it to the metal shaft with a 2-component adhesive. (See centre photo)
Also the pens needed replacement. They are still available.
As you can see in the demo video it works well.
|Bohn Contex 55|
|Friden EC 1117|
|Hamann Manus R|
|LLoyds Accumatic 55|
|LLoyds Accumatic 100|
|MBO TRS 1300P|
|TI SR56 & PC100A|