35
KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
8.10. EHS Does Not Work
8.10.1.
EHS (Plantronics) 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: R185,IC173,R170,R171,R172
D170,C170,C171,and Jumper chip
NO
Measure the EHSTX signal between Pin 3 and Pin
4
of JK302.
See the communication waveform.
Refer to the waveform (18).
YES
Related parts: R182,Q172,R180,IC172,
R176,Q171,R173,R174,
and Jumper chip
NO
Measure the EHSRX signal Pin 8 of IC150.
See the communication waveform.
Refer to the waveform (19).
YES
Related parts: IC150,JK302
NO
Confirm the EHS communication.
Can you use the EHS?
YES
END
Note: Additional reference : See Table-4