Version 0.1
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Batteryless telephone system with public address mode BLTS-1006
6
CURRENT REPAIR OF SC
6.1
Сommutator telephones and telephones
The list of possible malfunctions and troubleshooting is represented in Table 12.
The staff shall eliminate malfunctions of сommutator telephones and telephones
using SPTA kit portable.
Table 12 – The list of possible malfunctions and troubleshooting
Malfunction
Possible reasons
Instructions
1 No operation (glowing) of
«Power» LED
2 «Call» button does not ini-
tiate a call
3 No buttons backlight (dim-
ming button does not work)
PSU failure (power is not
supplied)
Replace the fuse (de-energize the SC)
using SPTA kit
Supply power to PSU
See below section
Power supply units
Fuse malfunction on tele-
phone (сommutator tele-
phone) on power circuit
Replace the fuse
Power supply to the unit was
not included in project
No actions required
While rotating handle of
electric generator, «Inductor
on» LED is not glowing
Electric generator malfunc-
tion, or inductor circuit con-
tact malfunction
Replace the telephone (сommutator
telephone)
While rotating handle of
electric generator, call is not
performed (but LEDs «In-
ductor on» and «Call» are
glowing)
Contact malfunction (con-
nection) in user line or con-
nector
Check communication line and con-
nection reliability, switching on con-
nectors and terminals contacts
Contact malfunction in
switch circuit (toggle) of
user select (only for сommu-
tator telephones)
1) Check the toggle circuit, restore
contact
2) Replace a telephone
No local (and external) sig-
naling of incoming call (No
operation (glowing) of
«Call» LED; no sound sig-
nal)
Contact malfunction (con-
nection) in user line or con-
nector
Check communication line and con-
nection, switch on connectors and ter-
minals contacts
External signaling units do
not operate during incoming
call (see also section of
relay
unit RBWSB
)
No power mains
Supply power to signaling units
(switch on power mains)
Fuse malfunction on signal-
ing unit control circuit
Replace the fuse
Contact malfunction (con-
nection) in signaling unit
connection circuit
1) Check the connection circuit, re-
store contact
2) Replace the unit
Signaling unit malfunction
Replace the unit; replace a bulb in
flashing lamp
