Bosch Appliances LBB 1903/10 Setting the chime volume, Setting the output voltage for LBB1914

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Plena Mixer Amplifier Installation and Operating Manual Internal settings

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2.3 Setting the chime volume

Adjusting the potentiometer VR401 changes the volume of the chime attention signal, preceding a priority call. Be careful not to adjust VR701; this is a power amplifier factory adjustment.

2.4 Setting the output voltage for LBB1903, LBB1906 and LBB1912

Direct outputs for 70 V, 100 V and low impedance (8 Ohm) loudspeakers are provided. Jumper JP802 sets the Call Only and Mix Only outputs to 70 V or 100 V output. These outputs are controlled by a priority relay. The Call Only output only provides priority announcements, while the Mix Only output just provides the mixed signals and switches off at priority calls.

2.5 Setting the output voltage for LBB1914

Jumper JP901 sets the Call/Mix, Zone 1, Zone 2, Call Only and Mix Only outputs to 70 V or 100 V output. Setting JP902 can also set the direct Call/Mix output to 8 Ohm for low impedance loudspeakers. The Call Only and Mix Only outputs are controlled by a priority relay. The Call Only output only provides priority announcements, while the Mix Only output just provides the mixed signals and switches off at priority calls. The zone selection buttons control the outputs of Zone 1 and 2, but priority announcements are always routed to these zones.

Bosch Security Systems 2003-09 3922 988 92883en

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Contents Plena Mixer Amplifier Page Important safeguards About this manual Safety precautionsTable of contents Bosch Security Systems 2003-09 3922 988 92883en About the mixer amplifier Phantom PowerControls and connections front Controls and connections rear Setting the speech filters Internal settingsSetting the VOX for microphone input Setting the output voltage for LBB1914 Setting the chime volumeSetting the output voltage for LBB1903, LBB1906 and LBB1912 Installation in rack Priority microphone External settings and connectionsConnect the DC supply battery 115V/230V Chime ON/OFF-switchEmergency input Microphone inputsMusic source inputs Connecting the line outputLBB1912/10 Connecting loudspeakers2Low impedance loudspeakers Mains connectionZone selection LBB1914/10 only Volume and tone controlOperation of mixer amplifier Source selectionInputs Technical dataElectrical PerformanceEnvironmental conditions OutputsGeneral Page For more information visit