Read Panasonic KX-T7735RU-B (serv.man2) Service Manual Supplement online
11
KX-T7735RU-B
1.7.4.
TONE GENERATION CIRCUIT
Change from the Original Service Manual Section 8.4.
Function:
This circuit generates all system tones including COL, extension, busy, DTMF signals and key in confirmation tones during the
power failure mode and is comprised of IC1(DTMF Generator) and IC5 (Analog Switch).
power failure mode and is comprised of IC1(DTMF Generator) and IC5 (Analog Switch).
Circuit Operation:
For an output of a single row tone, the row terminal and the each column terminals intersecting with it are required to be brought a
low state. For a dual tone output, one row terminal and one column terminal are brought to low state.
low state. For a dual tone output, one row terminal and one column terminal are brought to low state.
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