I just bought a Michel TKM MX-11 replacement com to swap out with a Narco
Com11A. In the install notes it says that if the unit is used with a
intercom then "C75 and R133 needs to be added to the computer motherboard".
This note is handwritten. Anyone know what this does, and how can TKM claim
to be slide in replacement if modifications to the unit are required ?

TIA
--Rohit