HP 19C big print font size

[tangdfx]

Recently, I acquired a HP19C from ebay.

Initailly it can not print and the other calculator function is OK.

Then I open it and clean the corrision and try again.

This time , the printhead run forever and can't stop.

But I can print without problem except endless movement of the printhead.

One day after, I get the help from Tony and suspect that the home position can not acquired is the root cause.

Finally fix the endless movement issue. But I get another issue is that the HP19C can print and stop at the home position. But the printed character is bigger than normal.

With this situation is OK for me but for longer number (example 3.1415926 ),there will be not enough space to print out.