Hitachi V-151F Operation Manual page 23

TV (-) : generally
TV ( + )
TV Sync (-)
TV Sync (+)
When the sync and blanking pulses of the dis
played video signals are negative, set the MODE
switch to TV(-).
If the sync and blanking pulses are positive,
set the switch to TV(+).
Note: Using the MODE switch @ with TV(-), don't
set the slope switch to (-) slope.
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