Sony UVW-1800P Service Manual page 67

TBC-25 Board
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The switches $500-1 become valid only when $201-1/SS-53 is set to ON (CLOSE).
Switch No.
LEVEL REF SW : Used for Y/C level adjustment.
When this switch is set ON, the calibration signal having reference level is
output. This signal is generated from interna} data and used for calibrating
the D/A and A/D level. Make sure to set this to off after adjustment.
Y MUTE SW : Y signal is muted from the TBC output.
'When this switch is set ON, Y signal is muted in the all video outputs.
C MUTE SW : R-Y and B-Y signals are muted from the TBC output.
'When this switch is set ON, the R-Y and B-Y signals are muted in the
COMPONENT | and 2 outputs. In addition only the chroma signal is
muted in the COMPOSITE VIDEO OUT. (The color burst is not muted.)
No use
FACTORY SETTING