How to use the wheelwriter keyboard drive and sense diagrams:

The left keyboard connector is the drive, the right is the sense connector. When counting lines, count from left to right.

Wheelwriter models AW, W-3, 5, 6 and Quietwriter 6, 8 have 13 pin drive (left) connectors. All others have 15 pins.

Do not count the first contact on the 15 pin drive connectors (it doesn't go anywhere).

Resistance should not exceed 90 ohms, according to the manual, but keys usually continue to function at much higher readings.

Connect the meter to the corresponding lines and depress the suspect key(s) to measure.

The rightmost 7 lines on the sense (right) connector (language ID lines) should all be shorted together for US keyboards.

Other languages will have holes punched through some of the language lines (these, of course, should read open).

Open language lines usually cause mal-selection, error code or what appears to be escapement failure on some keys.