Atari, Inc. 🇺🇸 1982
To troubleshoot and repair the ATARI CX85 Numeric Keypad, you need no special tools or test equipment. You need an ATARI 400 Computer.
This information packet contains a listing a of a short test program, test procedures, troubleshoot procedures, an assembly drawing (Figure 1 ), a schematic (Figure 2), and a parts list.