Sanyo VCC-XZN600P Instruction Manual page 84

3. The auto gain control (AGC) cannot be set to "OFF".
In the following conditions, the [AGC] option is fixed to "ON" and the auto gain control cannot be
disabled.
When the [SENSE UP] setting is made while "AUTO" is selected for [IRIS]
1
When the Day/Night function (DAY/NIGHT) is set to "AUTO"
2
4. The motion sensor option (MOTION) cannot be set to "ON".
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