Hello ,
The 2245 and 2246 went out of production in about 1987. The last manual I see for them was from 1987
This web site is a good place to look for information on older products.
https://w140.com/tekwiki/wiki/2245
The 2245A and 2246A went out of production in about 1994. The last manual I see for them was from 1989
This web site is a good place to look for information on older products.
https://w140.com/tekwiki/wiki/2245