Service manual for R&S CMS-50/52

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Communication Service Monitor

Hello, I am new member of the HF.
Recently I got nice diagnotic equipment, Rhode and Schwarz CMS-52 AM/FM/SSB Communication Tester.
Almoust working. PWR ON selftests are passed.
But,
when measuring signal, insted of expected and verified miliwatts it is showig hundreds of Watts.
So all measurements are wrong and unrealiable.
Prewious owner told me as it was every thing OK one day and next day after switch on it is measuring in wrong way.
To start repair I desperately need Service Manual.
Unfortunatelly I am not able to find it on the internet.

Could someone help me please ?

73, Mietek SQ5PTQ  ex SP5HBT

Last edit: by sp5hbt

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