Service
Service speech
188
Whistling
at
door station
. Acoustic test.
Volume too loud.
Decrease volume at door
intercom module or built-in
loudspeaker or make
microphone quieter.
Monitor
on indoor video
station/handsfree video
intercom unit
will not turn
on
, but doorbell signal is
coming through.
Target voltage of 16 V AC /
18 V DC not present
between terminals ~ and ~
of indoor video station.
No voltage from mains
transformer 1 6477 or video
power supply unit 1 4874.
Test line or power supply
unit and transformer.
Monitor
of indoor video
station/handsfree video
intercom unit switches on,
but there is
no picture
.
Signal on TwinBus video
line 1 Vss, symmetrical is
not present.
Camera not supplying video
signal.
Check camera and supply
voltage.
Open circuit in TwinBus
video line.
Check line.
Connect camera directly
to an indoor video
station/a handsfree
video intercom unit.
No picture.
Additional devices (e. g.
video line distributor1 4813)
not switching video signal
through.
Check additional devices
and their supply voltages
and replace if necessary.
Red LED on video board
not illuminating at indoor
video stations/handsfree
video intercom units for a
bus line.
A voltage is fed into the
TwinBus video line between
the indoor video station/
handsfree video intercom
unit with illuminating LED
and the downstream or
upstream indoor video
station with non-illuminating
LED of the bus line.
Remedy wiring error.
Image fault
at indoor video
station/handsfree video
intercom unit (
Negative
image
).
Optical inspection.
Connections Va and Vb of
the TwinBus video line have
been switched.
Switch round connections
Va and Vb of the TwinBus
video line.
Image
at indoor video
stations/handsfree video
intercom units is
”running”
.
Voltage between terminals
~ and ~ of indoor video
station/handsfree video
intercom unit is less than
the target voltage of
16 V AC or 18 V DC.
Supply voltage too low.
Increase voltage.
Lines too long.
Increase voltage.
Too many indoor video
stations/handsfree video
intercom units being
supplied by the same video
power supply module
1 4874.
Use an additional video
power supply module.
Switching device 1 4981
or
door selector switch
1 4982
not reacting
.
Optical inspection.
Bridges missing from
terminals a, b, 1, 2, 21 of
additional device to power
supply unit 1 7573.
Also fit these bridges to the
system bus connector.
Switching device 1 4981
not reacting
.
Optical inspection.
Switching command not
programmed.
Program switching
command. Refer to “Start-
up” on page
.
Fault
Measuring point/test
Cause
Remedy
Содержание TWINBUS
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