Sony UVW-1800 Operating Instructions Manual page 39

Phase adjustment procedure
When using two or more players, as in an A/B roll editing system, phase
synchronization of the signals (i.e. system sync) is necessary and for composite
signals only, the subcarrier phase must also be in sync. If not, picture instabilities
or color break-up may occur at edit points. After configuring the editing system,
use a Vectorscope to adjust the sync and subcarrier phase of the recorder and
players. Subcarrier phase adjustment is necessary only when using composite
signals.
Connections for phase adjustment
1 Press the SCH button on the Vectorscope.
The Vectorscope switches to "SCH" mode.
2 Press the B channel button on the Vectorscope.
This displays the black burst signal from the switcher.
3 Press the EXT button on the Vectorscope.
This switches the Vectorscope to external synchronization mode.
(Continued)
Chapter 5 Editing 5-11 (E)