3.3 POWER SUPPLY INDICATORS
3.3.1
Power Supply
The power supply for the main equipment contains a Power Failure Indicator, ‘RL’ LED, which
lights when a mains power failure occurs for more than 80 m sec.
On power up the system is automatically reset. Depression of the ‘RS’ switch will extinguish the
LED. This does NOT reset the system.
For an extended power failure the system will assign specific stations to given exchange lines, if
powerfail stations are provided.
The mains and all power supply voltages are equipped with indicators which light when the
supply is active.
If trouble arises with any of the supply voltages, check the voltages (see section 3.2) and, if
necessary, replace the associated fuse, or the power supply. Refer to Section 3.4.2 Power
Supplies.
The table illustrates which fuse corresponds to a given supply.
3.3.2
TABLE 16 POWER SUPPLY FUSE RATINGS
FUSE
RATING
POWER SUPPLY
1236
VOLTAGE
6 1 6
2260
FO
2A
5A
MAINS
5A
3 o v
F2
3A
3A
5 v
F3
3A
3A
2 4 V
F4
5A
5A
7.5 v, 15 v
Remote Extension and Tie Line Interface Unit
The power supply for the
is equipped with one pilot lamp. This lights when power is
supplied from the mains.
There are three mains derived DC supplies contained in the unit. If trouble arises with any
supply check the voltage and the power supply fuses.
If necessary replace the fuse, or the entire RTIU. Table 19 illustrates which fuse corresponds to
a given supply.
TABLE
FUSE RATINGS
FUSE
FO
F2
F3
RATING
1 A
SUPPLY VOLTAGE
MAINS
+
123
ISSUE 2