This is a safety feature. If you are unable to insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding-type lug. Bosch Security Systems | 2003-09 | 3922 988 92983en...
Do not open the unit when it is connected to the mains. The unit contains non-insulated parts, which can cause electric shock. Caution There are no user-serviceable parts inside the unit. Service must be done by qualified personnel. Bosch Security Systems | 2003-09 | 3922 988 92983en...
2 VU-meter (LED's for -20, -6, 0 dB and Power ON) 3 Battery operation indicator (only for LBB1938) 4 Overheat indicator (only for LBB1938) 5 Air inlet for forced air cooling (only for LBB1938) Bosch Security Systems | 2003-09 | 3922 988 92983en...
Insert the high power fuse into fuse holder F701 for 100 V selection (default setting), or into fuse holder F702 for 70 V selection. This selection does not affect the output voltage of the loudspeaker direct outputs. Caution Never insert two fuses into F701 and F702 simultaneously. Bosch Security Systems | 2003-09 | 3922 988 92983en...
If the internal temperature reaches a critical limit due to insufficient air flow, overload or an excessive ambient temperature, the overheat protection will be activated, causing the amplifier to switch to standby mode. Bosch Security Systems | 2003-09 | 3922 988 92983en...
You can earth (8) the unit to increase the electrical stability of the system. Caution The connection cable must have an in-line fuse. Use the type of fuse as mentioned in the illustration. Bosch Security Systems | 2003-09 | 3922 988 92983en...
For the LBB1938 use program line - input 2 (4) and line loopthrough 2 (6) for normal operation without priority. Volume control Use the volume control next to the line input to set the output level of the booster amplifier. Bosch Security Systems | 2003-09 | 3922 988 92983en...
LBB1925/10 controls the calls by distributing 24 Vdc via the call zone relays to the LBB1938 input 1 priority control terminals (15). Each booster serves one loudspeaker zone. Each zone can be OFF, or receive music or a call. Bosch Security Systems | 2003-09 | 3922 988 92983en...
The 100 V input of the LBB1938 (13) is not affected by the control terminals for input 1 priority (15) or input 2 enable (14). Bosch Security Systems | 2003-09 | 3922 988 92983en...
The booster amplifier can drive 100 V constant voltage loudspeakers at full power (100 V) or half power (70 V). Connect the loudspeakers in parallel and check the loudspeaker polarity for in-phase connection. The summed loudspeaker power should not exceed the rated amplifier power. Bosch Security Systems | 2003-09 | 3922 988 92983en...
Use the supplied mains cord to connect the system to the mains supply. Note (LBB 1930 and LBB 1935 only) If necessary set the mains voltage switch 230/240 V (11) to the required voltage using a sharp object, e.g. a small screwdriver. Bosch Security Systems | 2003-09 | 3922 988 92983en...
The overheat indicator (4) lights up if the power stage is switched OFF by the overheat protection circuit. The battery operation indicator (3) lights up if the mains power supply is failing and the back-up battery is in use. Bosch Security Systems | 2003-09 | 3922 988 92983en...
100 x 430 x 270 mm (19” wide, 2U high, with feet) LBB1938/00 145 x 430 x 370 mm (19” wide, 3U high, with feet) Weight LBB1930/x0 approx. 10.5 kg LBB1935/x0 approx. 12.5 kg LBB1938/00 approx. 25 kg 19” mounting brackets included Bosch Security Systems | 2003-09 | 3922 988 92983en...