Bosch CCS800 Service Manual page 21

CCS800 | Service manual | Chapter 5 | Microphone stem adjustment
5 Remove the factory-adjusted unit and place the
unit for adjustment in the same position.
5a Read the audio level on the AC meter.
5b Tune R72 to the audio ref. level as measured
before in 4a.
Note
In the bottom housing is a small hole for access to R72. Use a watchman screwdriver with 1.5 to 2.0
mm blade. 270 degree rotation is + to – 3dB sensitivity variation.
Never adjust the microphone when it is not necessary!
Bosch Security Systems | 2005-01| 3922 880 21112
Do not change the audio setting adjustments.
Take note of the value.
That's all.
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