1
Press the LED Test switch on the FSU-796 List 5 front panel and verify that all Tip and Ring LEDs
(T1-T8 and R1-R8) and power supply LEDs (-170 Vdc, 200 Vac, -30 Vdc, -52 Vdc, and ±5 Vdc)
are on.
•
If no LEDs light, replace the 9V battery.
•
If no LEDs light after replacing the 9V battery, replace the FSU-796 List 5 Streaker card.
•
If any one of the LEDs do not light, replace the FSU-796 List 5 Streaker card.
1
Slide the FSU-796 List 5 into the RT enclosure channel unit slot to be tested until the retaining latch on the
front panel locks into position. (Refer to Figure 1 for the channel unit locations.)
2
Proceed to "Verifying the Channel Unit Slot Wiring."
Use the following procedure to verify the wiring from each channel unit slot in an FRE-765 RT enclosure to the
termination point.
1
At the cable termination point, connect a jumper lead from frame ground to the appropriate Tip or Ring
subscriber termination and verify that the corresponding Tip or Ring LED on the FSU-796 List 5 is on.
•
If the correct Tip or Ring LED lights, proceed to the next subscriber termination.
•
If the Tip or Ring LED under test does not light, or the wrong LED lights, check the wiring to the RT
enclosure.
2
Repeat the previous step for each channel card Tip and Ring subscriber termination.
3
Proceed to "Testing the Line Unit Power Supply Voltages."
Verify that a 9V battery is installed on the FSU-796 List 5 Streaker card before starting this
procedure.
An RT line unit is not required when testing the channel unit slot wiring.
Refer to the appropriate FRE-765 RT enclosure technical practice for channel unit
subscriber terminations, and wire color or connector pin locations for the specific
FRE-765 RT enclosure to be tested.
Before You Install the FSU-796 List 5
Installing and Testing the FSU-796 List 5
Verifying the Channel Unit Slot Wiring
Use the following procedure to verify that the line unit power supply voltages are present at each of the channel
unit slots.
1
Slide the FSU-796 List 5 into the RT enclosure channel unit slot to be tested until the retaining latch on the
front panel locks into position. (Refer to Figure 1 for the channel unit locations.)
2
Verify that the -170 Vdc, 200 Vac, -30 Vdc, -52 Vdc, and ±5 Vdc LEDs are on.
•
If any of the power supply LEDs do not light, replace the line unit.
•
If none of the power supply LEDs light, check that power is applied.
3
Repeat steps 1 and 2 for each channel unit slot.
.
Figure 1. Channel Unit Slots CU1 - CU4
(FRE-765 List 4D and 4E Shown)
An RT line unit must be installed and operating (with power applied) to supply the FSU-796
List 5 with the power supply voltages (-170 Vdc, 200 Vac, -30 Vdc, -52 Vdc, and ±5 Vdc)
required for this test.
Testing the Line Unit Power Supply Voltages
9
10
8
7
6
5
4
3
2
1
9
10
8
7
6
5
4
3
2
1
9
10
8
7
6
5
4
3
2
1
Channel unit slots
(CU1-CU4)
