About The System Pre-Amplifier - Bosch LBB 1925 Installation And Operating Manual

Plena System Pre-amplifier | Installation and Operating Manual |
1

About the system pre-amplifier

Figure 1.1
Tel/EMG
Trigger 1
Alarm/Timer
Trigger 2
VOX
P.S.
1mV
/Line
S101
200mV
CD
Selector
Music
Tone Control
O
Aux
PC Audio In
Interface
RS-485
RS-232
Figure 1.2
The Plena System Pre-amplifier is a mono amplifier, which mixes a call-station signal with a background music
signal. You can adjust the volume and tone for both signals. The background music channel has 3 possible inputs
(CD, Tape and AUX) and a direct XLR output for 2-channel use. Internal relays control the audio routing to the
6 zones. The zone selection keys at the front determine to which zones the background music is send.
Bosch Security Systems | 2003-09 | 3922 988 99483en
0 dB
-6 dB
-2 0 dB
P ow er
S e le
c t
/L in e
CD
AU X
Block Diagram LBB 1925/10
Tone Tone 1
B1 B2 Chime
S301
1 2 3 4 5
Alarm/Timer/Chime
Call Station In Use
LBB1941/00
Tone
Z1 Z2 Z3 Z4 Z5 Z6
S302
1 2 3 4 5 6
Tone
M.C.U. Z1 Z2 Z3 Z4 Z5 Z6
S303
1 2 3 4 5 6
VR1
Priority
Speech filter
JP101
ON/OFF
Out
1-CH use
VR101
F1
115V/230V
0.5A
F101
+
24V DC IN
1.5A
-
About the system pre-amplifier
Z 1
Z 2
+
Z 3
Z 4
Z 5
Z 6
+
0 1 2
6 7 8
A1
Tigger 1
7 8
Alarm/Timer
A2
Tigger 2
7 8
VU LED
Announcement
Tone Control
Master out
JP102
Headphone
2-CH use
O
24V DC
F101 F102
+
24V DC OUT
-
0.5A 0.5A
18V DC
Call 100V
Call 0V
J2 CAll & BGM 0V
BGM 100V
BGM 0V
RA1
24V DC
Front panel
J4
R1
Key switch
Zone 1
Call active
CAll & BGM 0V
RA2
Front panel
Key switch
Zone 2
CAll & BGM 0V
RA3
Front panel
Key switch
Zone 3
CAll & BGM 0V
RA4
Front panel
Key switch
Zone 4
CAll & BGM 0V
RA5
Front panel
Key switch
Zone 5
CAll & BGM 0V
RA6
Front panel
Key switch
Zone 6
en | 7
Zone 1,0V Out
Zone 1,100V Out
Zone 1 override
RB1
Zone 2,0V Out
Zone 2,100V Out
Zone 2 override
RB2
Zone 3,0V Out
Zone 3,100V Out
Zone 3 override
RB3
Zone 4,0V Out
Zone 4,100V Out
Zone 4 override
RB4
Zone 5,0V Out
Zone 5,100V Out
Zone 5 override
RB5
Zone 6,0V Out
Zone 6,100V Out
Zone 6 override
RB6