Service
Service speech
186
No call signal
from
built-in
loudspeaker 1 4921
to
all
intercom units.
At power supply unit 1 7573
, the target voltage of 11 V
AC cannot be measured
between terminals 3 and 4.
Short circuit
Remedy short circuit.
Thermal fuse of TwinBus
power supply unit 1 7573
has activated.
De-energize power supply
unit 1 7573 – see
page
.
At built-in loudspeaker
1 4921, the target voltage of
11 V AC cannot be
measured between
terminals 3 and 4.
Open circuit in TwinBus
line.
Check and repair line.
No call signal
to
an
intercom unit.
Call signal not
programmed.
See “Start-up” for intercom
unit on page:
for indoor telephone
1 7630;
for indoor telephone
1 7650;
for indoor video
station
1 7857, 1 7855;
for handsfree video
intercom unit
1 7835, 1 7845;
for compact intercom
unit
1 7132
for handsfree video
intercom unit 1 7230.
Intercom unit is defective.
Replace intercom unit.
The target voltage of 24 V
DC to 30 V DC is not
present at the intercom unit
between a and b.
Open circuit in TwinBus
line.
Check and repair line.
No call signal
for
indoor telephones 1 7630,
1 7650
or
compact intercom unit
1 7132
or
handsfree intercom unit
1 7230,
or
indoor video stations
1 7855, 1 7857,
or
handsfree video intercom
units
1 7835, 1 7845.
Button
flashes
when
door ringing occurs.
Muting activated.
Deactivate muting. Refer to
Page:
for indoor telephone
1 7630;
for indoor telephone
1 7650;
for indoor video
station
1 7855, 1 7857;
for handsfree video
intercom unit 1 7835,
1 7845;
for compact intercom
unit 1 7132;
for handsfree video
intercom unit 1 7230.
Fault
Measuring point/test
Cause
Remedy
Содержание TWINBUS
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