Hitachi VT-FX6510A Owner's Manual page 69

COPYING FROM ONE VCR TO ANOTHER VCR (DUBBING)
3 Press the PLAY button on VCR-2. You will see the taped program being played on the TV.
4 When you see the part of the program you wish to record, press the PAUSE button on VCR-1
again to release pause and start recording.
Press the STOP button to finish recording.