Service manual

SERVICE MANUAL TNC 415B/425
Page 83
Issue: 20.08.95
14.3 Error Messages
HANDWHEEL ?
- Data transfer (cable) has been interrupted
- Incorrect value entered in MP 7640.
HANDWHEEL DEFECTIVE
The light unit in the electronic handwheel is not emitting enough light, with the result that the signals
in the handwheel become too small. An error signal is sent over the serial interface of the handwheel.