Version 0.1
38
Batteryless telephone system with public address mode BLTS-1006
6.3
Relay unit
Table 14 – The list of possible malfunctions and troubleshooting of relay unit
Malfunction
Possible reasons
Instructions
External signaling units do not
operate at incoming call (see
similar problem in
Telephones
and сommutator telephones
)
Fuse malfunction in signaling
unit output circuit
Replace the fuse
No power mains
Supply power
Communication line failure
of telephone or сommutator
telephone
Check the line and repair commu-
nication line
Malfunction of input or out-
put circuit, or board switching
circuit malfunction
Replace the board
