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(2) CALLING TONES FROM COL AND EXT.
For a calling tone from a CO line or extension, the single row tone signal is output from Pin 60
of IC2 and the tone volume is controlled by transistors Q999.
Ringer Volume Control
Level
OFF
Q999
OFF
*CAUTION:
It is ON with ringer sound and it is OFF with no ringer sound
regardless of the ringer volume.
LOW
HIGH
ON*
OFF
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