Testing And Troubleshooting - Elenco Electronics TWT-1K Assembly And Instruction Manual

TESTING AND TROUBLESHOOTING

1. One of the most frequently occurring problems is poor solder connections.
a) Tug slightly on all parts to make sure that they are indeed soldered.
b) All solder connections should be shiny. Resolder any that are not.
c) Solder should flow into a smooth puddle rather than a round ball. Resolder any connection that has
formed into a ball.
d) Have any solder bridges formed? A solder bridge may occur if you accidentally touch an adjacent foil
by using too much solder or by dragging the soldering iron across adjacent foils. Break the bridge with
your soldering iron.
2. Use a fresh 9V battery.
3. For all steps of testing (Tables 1 and 2), if the LED doesn't light or more than one LED lights up, check for
bridges and open pads on the PC board, wires of the testing pair cable, and the testing LED.
If the color of the LED does not match with the color shown in the instructions, check orientation of the LED.
4. For testing, use a fresh 9V battery and battery snap.
The following is the procedure for testing the PC board assembly and telephone line analyzer.
5. Test the RJ-11 connector.
Touch the red wire of the battery snap to pin 3 and the black wire to pin 2. The LED D3 of the PC board (#1
label) should light green.
Touch the red wire of the battery snap to pin 2 and the black wire to pin 3. The LED D3 (#1) should light red.
Check the other LED in the same manner and refer to Table 1 below.
6. Test the RJ-45 connector.
Check the RJ-45 connector in the same manner as the RJ-11 and refer to Table 2 below.
Table 1 RJ-11
Step Description
Red to pin 3
1
Black to pin 2
Red to pin 2
2
Black to pin 3
Red to pin 1
3
Black to pin 4
Red to pin 4
4
Black to pin 1
Figure 13
LED
PCB Label Color
D3 #1 Green
D3 #1 Red
D2 #2 Green
D2 #2 Red
-8-
RJ-45
1
8
1
4
RJ-11
Table 2 RJ-45
Step Description
1 Red to pin 5, Black to pin 4
2 Red to pin 4, Black to pin 5
3 Red to pin 3, Black to pin 6
4 Red to pin 6, Black to pin 3
5 Red to pin 1, Black to pin 2
6 Red to pin 2, Black to pin 1
7 Red to pin 7, Black to pin 8
8 Red to pin 8, Black to pin 7
Battery Snap
Red
Black
9V Battery
LED
PCB Label
D3 #1
D3 #1
D2 #2
D2 #2
D1 #3
D1 #3
D4 #4
D4 #4
Color
Green
Red
Green
Red
Green
Red
Green
Red