Ericsson DT200 handset

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Hi everybody,
I have a problem whith the microphone in my DT200 handset , it has a
no-wire connection whith the circuit board made by a flexible strip
(like the ones in the tipical little LCD display connection). I
replaced the strip w a couple of soldered little wires but the mic
still has some intermittent problem.

Does anyone have the circuit schematic or the service manual of the
Ericsson DT200 and/or the BS230 base station?

Thanks in advance

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