HEIDENHAIN TNC 407 (243 020) Service Manual - Manual (Page 91)

SERVICE MANUAL TNC
Issue:
01.09.1995
Page 75
When the override potentiometer is turned to the right, the control outputs an analog voltage which is increased
proportionally to the servo lag up to max. The control is operating correctly if a voltage of
can be measured at the test adaptor with the multimeter. If no voltage can be measured, switch
off the main switch, disconnect the nominal value line from the servo amplifier and test for short-circuit. If the
nominal value line is in order, connect the connector X8 to the LE again (leave the nominal value line dis-
connected), switch on the main switch and repeat the measurement with reference mark traverse. If an
analog voltage can be measured now, the control is operating correctly. If no voltage can be measured,
the analog output of the LE is probably defective.
15.2.1 Checking the Analog Outputs: Setup
Test Adaptor
Multimeter
X8
Nominal Value Output
Flange socket with female insert