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7.6. TONE GENERATION CIRCUIT
(1) FUNCTION
All system tones including COL, extension, busy, DTMF signal and key-in tones are sent from Pins 60 of IC2 and controls the
path by the Analog Switch (IC8).
path by the Analog Switch (IC8).
(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.
controlled by transistors Q999.
Ringer Volume Control
Level
OFF
LOW
HIGH
Q999
OFF
ON*
OFF
*CAUTION:
It is ON with ringer sound and it is OFF with no ringer sound regardless of the ringer volume.
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KX-T7565RU
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