Filter
Top Products
4.2 Operation
The receiver cannot operate when no headphone is
connected. After connecting the headphone the receiv-
er switches to stand-by mode. Push shortly on the
on/off button to switch the receiver on.
The channel number is shown on the LCD display.
The channel can be changed with the channel selector.
Push it to the up- or down-position to increase or
decrease the channel number. The highest channel
number is automatically matched to the number of
channels that has been set on the transmitter (see sec-
tion 2.5.9).
A battery symbol is visible on the display when the
batteries or the battery pack is almost empty.
An antenna symbol is visible when the receiver picks
up a modulated infra red signal of adequate quality.
During short interruptions in the reception, the receiv-
er mutes the headphones output. When no adequate
IR signal is detected for more than 1 minute (e.g.
when a delegate leaves the conference room), the
receiver automatically switches to stand-by mode.
The volume can be changed by moving the volume
control up or down.
The receiver can be manually switched to stand-by
mode by pressing the on/off button for more than 2
seconds.
When the headphone is disconnected, the receiver is
automatically switched off. (A switch in the headphone
connector disconnects the batteries.)
The infra-red receivers can operate with disposable
batteries (2x AA-size alkaline cells) or with a recharge-
able battery pack (LBB 4550/00).
Insert the batteries or the battery pack in the receiver
with the correct polarity as indicated in the battery
compartment. The battery pack has a separate connec-
tion cable which must be connected to the receiver.
When this connection is not present, the charging cir-
cuitry in the receiver will not work. This also prevents
the unwanted charging of disposable batteries. The bat-
tery pack has a temperature sensor which prevents
overheating during charging.
For more information about charging the battery pack
see chapter 5.
4.3 Reception test mode
The receivers can be switched to a test-mode to get an
indication of the reception quality for each carrier sep-
arately. To activate the test-mode: Push the channel
selector to the Up-position, press the on/off button and
hold both for ca. 2 seconds. When in test-mode,
switch between carriers by using the channel selector.
The receiver’s display will shortly show the carrier
number (0-7) and then a quality indication (00-90).
The reception quality can be assessed as follows:
Indication Quality
00-39 Good reception. Very good audio quality.
40-49 Weak reception. Ticks in the audio.
50-90 No or bad reception. Poor audio quality.
The test mode is deactivated when the receiver is
switched off.
4.4 Receiver headphones
The headphones connect with the receivers via a 3.5
mm (0.14 inch) stereo jack connector. Suitable head-
phone types are:
• LBB 3441/10 Under the chin stereo headphones
• LBB3442/00 Single earphone (mono)
• LBB3443/00 Stereo headphones (recommended)
• Or any other compatible type (see chapter 7,
Technical Data).
Note: When the receiver does not receive
the selected carrier, it keeps displaying
the carrier number and does not display
its quality.
INTEGRUS | Installation and User Instructions | Integrus Receivers en | 49
Bosch Security Systems | 2005-04 | 3122 475 22015en
Note: Disposable batteries and battery
packs at the end of their technical lives
should be discarded with due care for
the environment. When possible, take
batteries to a local recycling station.