Panasonic KX-DT543-B Service Manual page 25

Table-4 : ASIC2(IC150) Data Error
Confirm the voltage at Pin 3 of IC150 (Ope PCB).
Is it about 3.3V?
YES
Confirm the voltage at Pin 19 and Pin 36 of
IC150 (Ope PCB).
Is it about 3.3V?
YES
Confirm the frequency of clock signal at Pin 39 of
IC300 (Main PCB). Is it 16.384MHz?
Refer to the waveform (4).
YES
Confirm the frequency of clock signal at Pin 1 of
IC150 (Ope PCB). Is it 2MHz?
Refer to the waveform (5).
YES
Confirm the waveform of communication
between IC150 (Ope PCB) and IC410 (Main PCB).
Refer to the waveform (6),(7).
YES
END
Check the soldering.
Resolder or replace parts as needed.
Related parts:
[Main PCB] CN400
NO
[Ope PCB] CN160,D160,C160,C161,C154
Flat Cable (Between Main PCB and Ope PCB)
NO
Related parts:
[Ope PCB] L150,C150,C152,C153
NO
Related parts: [Main PCB]
Related parts:
NO
[Main PCB] CN400,IC300,R334
[Ope PCB] CN160,R151
Flat Cable (Between Main PCB and Ope PCB)
Related parts:
[Main PCB] CN400,IC300,IC410,R424,
NO
[Ope PCB] CN160,IC150,L150,R151
Flat Cable (Between Main PCB and Ope PCB)
25
KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
C156
X301,R323,R324,C382,C383
R455,R456,R443,R442,
R334,R433,R452,R453,R454