Hitachi VT-F370A Owner's Manual page 52

Advanced Operations (Second VCR)
Press REC on VCR1, and press PLAY on VCR2.
To monitor the picture as you record, VCR1 must be connected to your TV (follow instructions in the other
VCR's manual). Press the VCR/TV button on the remote. The VCR indicator will light on VCR1's display
and you can view the picture being recorded.
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