Asic1(Ic300) Does Not Operate - Panasonic KX-DT543-B Service Manual

KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
8.2.

ASIC1(IC300) Does Not Operate

Confirm the voltage at Pin19,30 and 43 of
IC300 (VCC33).
Is it about 3.3V?
YES
Confirm the frequency of clock signal at Pin 39 of
IC300. Is it 16.384MHz?
Refer to the waveform (4).
YES
Confirm the waveform of reset signal at Pin1 of
IC300.
Refer to the waveform (8).
YES
Confirm the waveform of communication(SPI2)
between IC300 and IC410.
Refer to the waveform (9).
YES
Confirm the waveform of communication(PCM)
between IC300 and IC410.
Refer to the waveform (10).
YES
Confirm the waveform of receiving signals
from PBX.
Refer to the waveform (11).
YES
Confirm the waveform of transmitting signals
to PBX.
Refer to the waveform (12).
YES
END
Check the soldering.
Resolder or replace parts as needed.
NO
Related parts: C323,C327,C324,C328,C326,
NO
Related parts: X301,R323,R324,C382,C383
NO
Related parts: IC410,R423,C362
NO
Related parts: IC300,IC410,R333,R438,R439,
NO
Related parts: IC300,IC410,R330,R331,
NO
Related parts: T300,C309,C302,C303,
NO
Related parts: T300,D301,Q302,C309,
26
C329, L222
R440
R332,R416,R441
R301,R306-311,C310,C311
R301-305, C302-308