HEIDENHAIN TNC 407 (243 020) Service Manual - Manual (Page 51)

D-d3292
SERVICE MANUAL TNC
01.09.1995
Page 44
9.2 Checking the Keyboard Unit
Example:
The key contacts can be measured with an ohmmeter at the flange socket X2 of the keyboard unit
The measuring adaptor can also be used, if available
section 18.31.
If e.g. is pressed at the TNC operating panel, 100 can be measured between pin 17 pin 20
of the flange socket X2 at the TNC operating panel with the measuring adaptor (connections 17 and
TNC Operating Panel (Key Matrix)
Flange Socket
X2
of
X 2
of Keyboard