Step 11. Troubleshooting; Figure 26. Troubleshooting - Globalstar GSP-2800 Installation Manual

Step 11. Troubleshooting

If one or more telephones fail to work, use the following
troubleshooting procedure. These procedures should be used only by
a qualified service technician.
1. If one telephone fails to work,
check the wiring to that
telephone.
2. If more than one telephone
fails to operate:
— Disconnect the building
wiring from the QGFSP
at the junction box. Do
this by disconnecting the
short cable in the
junction box.
— Connect a known good
telephone to the jack in
the junction box. See
Figure 26.
If the telephone works, the problem is in the building wiring.
If the telephone still fails to work,
— Disconnect the telephone.
— Remove power to the QGFSP.
— Check the fuse on the power supply. If blown, check the
power supply wiring before replacing the fuse.
— Check the fuse on the RAU. If blown, replace the fuse.
RJ-II jack.
To test, unplug
pigtail and plug
in a known good
telephone
085AB_1999Q

Figure 26. Troubleshooting

— If the fuse blew twice, check to see if
– The power supply is not operating correctly
– The RAU is broken
— Open the junction box and check all connections.
Note
For continued protection against the risk of fire, replace a
blown RAU fuse only with an identically rated, certified fuse.
The fuse is an IEC certified 3 A, 250 volt, 5 X 20 fast acting
ferrule fuse contained in a fuse holder.
3. If you fail to find a problem, reapply power to the RAU and check
the voltage on the power supply screw terminals in the junction
box. The voltage must be between 10.5 and 16 VDC.
4. If you still fail to find a problem,
— Remove power to the RAU.
— Open the RAU access cover and double check the connections
within the RAU.
— Check the RAU fuse. If blown, double-check the power
supply wiring before replacing the fuse.
5. If you have followed this procedure and still have not found the
source of this problem, remove the unit and return it to your
service provider or a repair service designated by the service
provider for evaluation and repair.
Troubleshooting
34