NEC PF-51V21 - Manual (Page 7)

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6-6 MUTE
By pushing this key, sound output will be muted.
Push [MUTE] again, or Volume Up/Down, and
s ound Volume will return.
6-7 TV/AV Selection
You can select your video
source by the [TV/AV] key.
6-8 QUICK VIEW
TV Mode: Channel will quickly return to the previous Channel being
watched.
AV Mode: Back to TV channel
6-9 Channel Scanning
By pushing this key, Channels will change automatically
E ach channel will be previewed for 3 seconds, and stop at original channel.
Skipped channels will not be previewed.
6-10 CALL
This key will call the On screen display.
Push again, to remove the on screen display.
TV/AV
10
2
2
AV1
X MUTE
AV2
AV1
3
PAL
TV
Channel No.
Colour system
TV/AV
QV
SCAN
CALL
1
AUTO
SLEEP
57 4:09
OFF Timer and clock
（ These two options appear after
being set.） clock
S-Video