Service Manual TNC 407 / TNC 415 - heidenhain - DR. JOHANNES ...

I HEIDENHAIN
DyJHANNES HMDENHAIN GrnbH
D 83292 Tlawlre”t~ SF ,o 86 69) 31-o SERVICE MANUAL TNC 407/415
Kundendienst
Issue: 01.09.1995
Page 46
/ Kev 1 Flange Socket
X2 of Keyboard
I _ I Unit
0 * 25
0 6 25
m
0
7
*
25
26
0 6 26
#
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: approx. 0 to 4.95 V).