37
Version 0.1
Operating manual
Malfunction
Possible reasons
Instructions
No connection with calling
user, incoming call is set
(only for сommutator tele-
phones)
Contact malfunction in
switch circuit (toggle) of
user select
1 Check the toggle circuit, restore
contact
2 Replace the сommutator telephone
No transmission of voice
communication between us-
ers (including сommutator
telephones in case of correct
signaling for user connec-
tion)
Not enough power for tele-
phones operation (сommuta-
tor telephones)
Rotate the handle of inductor
No contact in receiver con-
nection circuit
Check and restore contact in the re-
ceiver connection circuit
No contact in external com-
munication device connec-
tion circuit
Check and restore contact in the exter-
nal communication device connection
circuit (communication lines, connect-
ors, socket, manual headset switch, in-
tercom helmet)
Telephone receiver malfunc-
tion (microphone module or
speaker)
Replace the telephone receiver
Headset (helmet)
malfunction
Replace the headset (helmet)
6.2
Power supply units
Control PSU operation by Power switch LED (available power supply mains);
check constant voltage 24 V (23…28 V – depending on the load) on the output terminals
of PSU.
The list of possible malfunctions and troubleshooting of PSU is represented in
Table 13.
Troubleshooting of PSU malfunctions is carried out using SPTA kit portable.
Table 13 – The list of possible malfunctions and troubleshooting of PSU
Malfunction
Possible reasons
Instructions
Power button is switched on, but
power indicator is not glowing
No power mains
Provide external power
Power indicator is on, but there
is no output voltage
Fuse malfunction
Replace the fuse
Transformer malfunction
Replace the transformer
Board malfunction
Replace the board
No output voltage in case of
main power failure (no switch-
over to standby power supply)
No power of standby network
Supply power from standby net-
work
Switching circuit on board is
faulty
Replace the board
Standby connection is not in-
cluded in project
No actions required
