Hitachi 27AX4B, 27AX3B, 27AX0B Operating Manual page 34

PICTURE-IN-PICTURE FUNCTIONS (27AX4B ONLY)
FREEZE BUTTON:
If you wish to freeze the sub-picture, press the "FREEZE" button. This is convenient
when trying to write down the address for a mail order company, recording statistics for
a sporting event, etc. To return to motion, press the button again.
FREEZE BUTTON WITHOUT A SUB-PICTURE:
Press this button without a sub-picture to freeze the picture you are currently viewing.
Press this button again to return to normal viewing. The other picture-in-picture function
(EXCHNG button) will not work with this FREEZE function.
CAUTION:
A pattern burn may develop if the sub-picture is left in the same corner permanently. If the
P-in-P feature is used frequently, occasionally shift the sub-picture to a different corner.
NOTE:
1. Only sound from the main picture can be heard.
2. When the "P in P" button is pressed, the sub-picture will appear in the same position as
previously set.
3. The "FREEZE" function is released when the "EXCHNG" button is pressed.
4. P in P will not work with a CHILD LOCK channel.