36
KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
8.10.2.
EHS (Jabra) Does Not Work
Check the soldering.
Resolder or replace parts as needed.
Related parts: R181,IC171,R177,Q170,R175,
D171,D172,JK302,
and Jumper chip
NO
Mesure the EHSDET voltage at Pin 7 of IC150.
Is it 0V?
YES
Related parts: [Main PCB] R453,R433,IC410
[Ope PCB] R184,Q173,Q174,
R202,R203,R178,IC170,JK302,
CN160 and Jumper chip
Flat Cable (Between Main PCB and Ope PCB)
NO
YES
Related parts: R183,R182,Q172,R180,IC172,
R176,Q171,R170,R171,R172,
R173,R174,C170,C171,D170,
and Jumper chip
NO
Measure the JABRA_URX signal at Pin 10 of
CN160.
See the communication waveform.
Refer to the waveform (21).
YES
Related parts: IC150,JK302
NO
Confirm the EHS communication.
Can you use the EHS?
YES
END
Measure the JABRA_URX signal at Pin 10 of IC410
on Main PCB.
See the communication waveform.
Refer to the waveform (21).
YES
NO
Related parts: [Main PCB] R454,CN400
[Ope PCB] CN160, and Jumper chip
Flat Cable (between Main PCB and Ope PCB)
Note: Additional reference : See Table-4
Measure the JABRA_UTX signal between Pin 1
and
Pin 4 of JK302.
See the communication waveform.
Refer to the waveform (20).