Tadiran Telecom Coral IPx 800 Series Installation Procedure And Hardware Reference Manual page 328

7-14
Coral IPx 800 Installation Manual
PS19 DC Fuses
The PS19 DC employs two fuses, F1 and F2, to protect the message and ringing
circuitry respectively.
If the F1 fuse blows, the message lamps for the SLT units connected via this
cage do not light.
If the F2 fuse blows, none of the SLT units connected via this cage can ring.
If the cage rear panel fuse blows, the PS19 DC Power green indicator and
Alarm red indicator do not illuminate.
To replace a fuse within the PS19 DC
1. Remove the power supply unit from its slot and place it over the anti-static
material with the component side facing upwards, as described on
Removing the Power Supply.
Do not insert or remove the power supply unit from the cage when turned ON. Sudden
power surges could damage system components.
2. Replace only with the same type and rating of fuse. See the PS19 DC card layout
in
Figure 7-2.
3. Reinstall the power supply unit as described in
Supply.
page 7-11,
page 7-10, To Install the Power