3.6.70
Internal Extension Intercom Call Received:
1.
Check wiring to RGU as follows:
OUT
to first B-pair corresponding to
board.
to second B-pair corresponding to
board.
Refer Section
2.
Check fuse on
board. (0.375 AMP
3.
If no ring voltage, replace RGU.
4.
Change internal extension.
5.
Replace
board.
3.6.71
Internal Extension Exchange Line Call:
1.
Check links on
board CN connectors:
Link 1 to 2 exchange line access allowed
Link 2 to 3 intercom access only.
2.
If all exchange line lines are busy, receive busy tone.
3.
Check system programming for access barring and exchange line equipping.
4.
Replace
board.
TESTS
3.6.72
Tie Line Seizure:
1.
Check
wiring to tie line as follows:
A,B : to tie line
to exchange line connection on main equipment.
2.
Check that
has power, that it is turned on, and the pilot lamp is lit. Check fuses all
are 1 AMP
3.
If LRB board fitted, tie line should receive interrupted ring voltage and calling station
should hear ring tone. If no tones or ring voltage, replace LRB board.
4.
If RRB board fitted, tie line should receive ring voltage steadily for approximately a second.
If not, replace RRB board.
5.
If still no ring voltage or tone, replace RTB board.
6.
Change RTIU.
7.
Change ELNB board.
3.6.73
Tie Line Answered:
1.
If LRB board is fitted, ringing should stop when a dc loop is completed by the tie line.
Battery feed of 48V is supplied for the tie line. If faulty, check fuses, then replace LRB
board.
2.
If RRB board is fitted, ringing should stop after approximately a second. If not, replace RRB
board.
The RRB board does not provide battery feed or a dc loop for the tie line.
3.6.74
Incoming Tie Line Call:
1
If LRB is fitted, a loop in tie
should send interrupted ring voltage to the main
equipment and ring tone to the tie line. If unsuccessful, replace LRB board.
2.
If RRB is fitted, ring voltage from the tie line should be detected and interrupted
voltage sent to the main equipment. If unsuccessful, replace RRB board.
3.6.75
Answering Tie Line:
1
Change ELNB board.
2
Replace LRB or RRB board
182
ISSUE 2