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TROUBLESHOOTING AND REPAIR |
TRIGGER TRANSFORMER TEST (continued)
FIGURE F.2 – TRIGGER TRANSFORMER TEST POINTS.
8.8 VAC
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1 2 3
4 5 6
24 VAC
TEST PROCEDURE
1.Remove the cover from the control box by removing the four 5/16 in. screws from the top and sides of the unit.
2.Unplug the transformer wire connector (J103) from the control PC board.
3.Connect 115 VAC to pins 3 and 6 on the transformer plug. See the Wiring Diagrams in Section G and Figure F.2.
NOTE: Transformer secondary voltages are given for a primary voltage of 115 VAC. The transformer secondary voltage will vary if the primary voltage varies.
4.Measure the voltage across pins 4 and 5 of the transformer plug. The voltage for a good transformer is 24 VAC.
115 VAC
5.Measure the voltage across pins 1 and 2 of the transformer plug. The voltage for a good transformer is 8.8 VAC.
6.If the voltages measured are not correct, the transformer is faulty and should be replaced.
7.Plug the transformer wire connector into the socket on the control PC board.
8.Reinstall the cover on the control box using four hex head screws.
