Sony TRINITRON KV-32HS20 Service Manual page 282

To prevent accidental switching of TV channels while using the cable box
It is a good idea to use the Channel Fix feature of your TV when
using the VCR or cable box. The Channel Fix feature locks the TV
tuner to a specific channel (such as 3 or 4). The Channel Fix
feature is under the Channel menu. (For details, see "Using the
Channel Menu" on page 40.)
To use Twin View with the cable box
Turn on the VCR. Use the remote control's TV/VIDEO button to set
the Twin View output to VIDEO 1. Change the Twin View
channel via the VCR. (The VCR's tuner is used as one of the Twin
View picture sources; if you do not turn on the VCR, the Twin
View will not work.)
This system is needed because the cable box unscrambles only one channel at a
time (unlike the CATV cable, which makes all channels available concurrently).
Installing the TV
17