HEIDENHAIN TNC 407 (243 020) Service Manual - Manual (Page 53)

83292 86 31-o
SERVICE MANUAL TNC
Issue:
01.09.1995
Page 46
F l a n g e S o c k e t
I Unit
X2 Keyboard
Checking the Potentiometers of the TNC Operating Panel
If an ohmmeter is connected to the pins, the following resistances can be measured (use a measuring adaptor,
if available):
Potentiometer Flange Socket X2 of Measured Value
Keyboard Unit
PIN PIN Position Position
0 150
Feed Override Pot 36 35 9.7 k 4.7 k
37 35 4.7 k 9.7 k
Spindle Override Pot 36 34 9.7 k 4.7 k
37 34 4.7 k 9.7 k
If a measuring adaptor is available, connect this adaptor between the logic unit and the keyboard unit.
Now the wiper voltages of the potentiometers can be measured at the above pins (values:
0 to 4.95