KX-UT133RU, KX-UT133RU-B, KX-UT136RU, KX-UT136RU-B (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 13

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KX-UT133RU/KX-UT133RU-B/KX-UT136RU/KX-UT136RU-B
4.2.8.
EHS Circuit
EHS is controlled by IC205. 
The audio signals are exchanged with IC501 through HANDSET JACK(JK101). 
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