Hitachi VT-FX6402A - Manual (Page 60)

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COPYING FROM ONE VCR TO ANOTHER VCR (DUBBING)
Hookup
If you have two VCRs, you may use one VCR to record a tape that is being played back in the other VCR.
To copy from one VCR to another VCR
1 Press the AVX button on the remote control of VCR-1 so that L (line) appears in the display.
2 Press the REC, then PAUSE buttons on VCR-1. The VCR will go into Record/Pause.