ISHIDA UNI-7 Service Manual page 152

Chapter 8 ADJUSTMENT MODE
4. When initializing the thermal head, press the [HEAD INITIAL] button.
Press the [EXEC] button for execution.
Press the [HEAD CHECK] button to check whether the thermal head functions properly or
not. You can hear the beep sound when the head is functioning properly.
8-10 UNI-7 Service Manual