Sony TRINITRON KV-27EXR20 Service Manual page 5

Channels
1 Press POWER on the TV or the
numerical sequence. The channels previously preset remain in the
TV's memory.
When no more channels can be found, the programming stops and
the lowest numbered channel is displayed
This channel has now been erased from the channel scan memory.
The next time you press the CH +/- button, this channel will be
skipped.
Repeat steps 1 and 2 to add or erase other channels
Cable: 1 — 125