1. Dual Audio Interface Unit LBB 3535/00
The DAI unit can be Assigned for:
Two Delegate positions
two microphones
two loudspeakers or
Chairman position
one microphone
priority control panel
one loudspeakers
Accepts line input
I&O Manual
DCN SA PO FMU

2. Dual Audio Interface Unit LBB 3535/00
6-pole Connector for connection of other system units (loop-through).
2 x 3.5 mm stereo jack-plug sockets for connection to LBB 3538/00 FM loudspeaker panel.
2 x 8-pole 262° DIN-type connectors for connection to Microphone with FM Control Panel LBB 3537/xx, or standard hand held microphones LBB 3536/x0 or the Chairman microphone Priority Switch Panel LBB 3537/10 to connector input1.
Notes:
- The output is switched off when the corresponding input is switched on.
- In voice-activate mode only one microphone input 2 is active!
DCN SA PO FMU

3. Dual Audio Interface Unit LBB 3535/00J2 J1
Closed
Open J2
Chairman's microphone : input 2
Priority control panel : input 1
Function
Mic. On 1&2 (factory setting)
Ambient microphone on input 2
Jumper setting J1
DCN SA PO FMU

4. Dual Audio Interface Unit LBB 3535/002 1 3 4 5 6
Initialisation button (INIT) used for initialising the unit during installation. Also used to reset the unit’s address.
Input 1 and 2: ± 3 dB input level potentiometer for fine adjustment.
Initialisation LED indicator.
Selector switch for selecting an asymmetrical/symmetrical microphone input
Input attenuation selection of: 0, 6, 12 or 18 dB. Factory setting: 6 dB.
Microphone or line level select switch. Balanced audio line-input level (-12 dBV) or microphone-input level (-60 dBV) sources, with or without phantom power supply.
DCN SA PO FMU

5. Multi-purpose connection unit LBB3540/15
The MPCU can be Assigned for:
One Delegate position or
One Chairman position
Entrance Unit
Exit Unit
I&O Manual
DCN SA PO FMU

6. Multi-purpose connection unit LBB3540/15
6-pole Connector for connection of other system units (loop-through).
2 x 3.5 mm stereo jackplug sockets for connection to: - LBB 3538/00 FM loudspeaker panel.
2 x 8-pole 262° DIN-type connectors for connection to: Microphone with FM Control Panel LBB 3537/xx, or standard microphones LBB 3536/00 and /10 or the Chairman microphone Priority Switch Panel LBB 3537/10 to connector input1.
Note: When two microphones are connected (delegate mode only), both are switched on at same time.
DCN SA PO FMU

7. Multi-purpose connection unit LBB3540/15
20-pole Micromatch connector for connection to:
- LBB 3541/00 FM Delegate voting
control panel.
- LBB 3542/xx FM Delegate/Chairman voting control panel with LC-display
6-pole modular jack for LBB 3555/00 Intercom handset.
10-pole Micromatch connector for connection to LBB 3543/15 FM ID-Card reader panel.
2 m long cable terminated with a 6-pole circular connector for connection to the trunk-line.
DCN SA PO FMU

8. Multi-purpose connection unit LBB3540/15
Input level potentiometer: ± 3 dB.
Initialisation micro switch (Init) used for initialising the unit during installation. Also used to reset the unit’s address (De-Init).
Initialisation indicator (LED) indicating the unit requires initialising.
Jumper for assigning the unit as either a delegate or as a chairman unit.
Selector switch for selecting: Asymmetrical / Symmetrical microphone input or Symmetrical microphone input with Phantom power supply (applicable to both inputs).
Input attenuation selection of: 0, 6, 12 or 18 dB (applicable to both inputs). Default setting: 6 dB. 9 10 8
DCN SA PO FMU

9. Multi-purpose connection unit LBB3540/15
Solder spot J2
Open (default): Normal operation
Closed: Microphone LED-ring will
begin to flash when the last 60
seconds of speech time remains
NOTE: If J2 is ‘closed’ when the ‘Voice’ activation mode is selected, the microphone LED-ring will remain lit when speaking into the microphone.
Solder spot J3
Closed: No display unit connected
J03
J02
J01
DCN SA PO FMU

10. Multi-purpose connection unit LBB3540/15
Configuration if Assigned as:
Delegate Unit with : Microphone’s, Control Panel(s) (with or without LC-Display), Intercom handset, ID-Card reader.
Chairman Unit with : Microphone’s, Control Panel(s) (with or without LC-Display), Intercom handset, ID-Card reader.
Entrance Unit with : ID-Card reader, LC-Display Control panel.
Exit Unit with : ID-Card reader, LC-Display Control panel.
Jumper on topside Chairman / Delegate
Open
Chairman
Delegate
Jumper Jo1 inside unit solder type
Closed
Function
Assigned as
Chairman Unit
Delegate Unit
Entrance Unit
Exit Unit
DCN SA PO FMU

11. FM - Microphone adjustment in DCN
Test set-up
Audio sine wave generator
Home made loudspeaker reference source “A” (see figure below)
CPSU/ CCU
AC mV meter
DCN FM
Unit
DCN SA PO FMU

12. FM - Microphone adjustment in DCN
Microphone stem
When the microphone stem assembly has to be replaced, it is required that the input level of the
microphone is adjusted again by use of the preset potmeter R(x).. This due to the spread in
sensitivity of the microphone capsule (approx.. ±3dB).
Procedure
The adjustment is a practical procedure to compare factory adjusted units with units were the
microphone stem is replaced and to be tuned to the system level again.
Measurement data output and adjustments is represented by the symbol Ä
Test procedure Comment
1 - Connect the Delegate unit with the CCU. Select mode only one active mic. on the CCU!
2 - Connect to the ‘Line out’ of the CCU the
AC mV meter
3 - Adjust the audio source to approx. 1kHz. The audio level of the lsp. should be distortion free and at a level of speaking distance Takes care that no acoustic nuisance from outside influence the measurements.
DCN SA PO FMU

13. FM - Microphone adjustment in DCN
Test procedure Comment
4 - Place the mic. of a factory adjusted Idea, make from an old DCN microphone head
Delegate unit close to the loudspeaker on housing an audio reference source.
a fixed distance Mount inside the (empty) head e.g. a paging
bleeper as ref. loudspeaker.
Important is that for all measurements the
distance between loudspeaker and microphone
is equal.
Ä Measure the audio level on the AC meter. Take this level as ref. for the DCN FM units to be
adjusted. Repeat the ref. measurement for a
check with other unit(s).
The factory level adjustment is ±0.5dB
5 - Remove the factory-adjusted unit and Do not change the audio setting adjustments.
place the unit for adjustment in the same
position.
Ä Read the audio level on the AC meter.
Ä Tune R(x) to the audio ref. Default as For the LBB3537/xx, tune the +/- 3dB adjustment
measured before potmeter of the LBB3535/xx or LBB3540/xx
DCN SA PO FMU

14. DCN Voting Unit Range LBB4141/x0
LBB4141/00 Voting Panel
LBB4141/50 Voting Panel Chinese
I&O Manual
DCN SA PO FMU

15. DCN Voting Unit LBB4141/00 Allows three types of voting: parliamentary
multiple choice (1-5)
audience response (++,+,0,-,--)
LED vote confirmation indicators
LED unit active indicator
Pimple for locating third button
DCN SA PO FMU

16. DCN Voting Unit Chinese Version LBB4141/50
Allows parliamentary voting
Colored voting buttons
Chinese text
LED vote confirmation indicators
LED unit active indicator
Pimple for locating “Yes” button
DCN SA PO FMU

17. DCN Voting Unit LBB4141/00 1 2 3 4
1 De-init/init switch for de-initialization and initialization of the unit
2 Button order jumper for setting the voting button order for parliamentary voting
3 DCN cable 1 meter DCN cable with male connector
4 DCN cable 1 meter DCN cable with female connector
DCN SA PO FMU

18. DCN Voting Unit LBB4141/00 1 2
1 Jumper Position 1 – for Parliamentary Voting
2 Jumper Position 2 – for Multiple Choice (1-5) and for
Audience Response (++,+,0,-,--)
Note :
The default position of the button order jumper is position 2
DCN SA PO FMU

19. End Caps. (Set of 50 Pieces). LBB4125/00 Couple Pieces
End Caps (Set of 50 Pieces) LBB4125/00 Couple Pieces (Set of 50 Pieces) LBB4127/00
DCN SA PO FMU

20. DCN Flush Mounting Units
End of section
 Robert Bosch GmbH
All rights are reserved. Reproduction or passing on to third parties in whole or in parts is prohibited without the written consent of the copyright owner.
DCN SA PO FMU