d. Through the pilot light to pilot light 1 and on to S1-2.
e. Through A1 to A1-1 and on to S1-2.
f. Through M1 to M1-1 to A1-3 to A1, through the winding of A1 to A1-1 and on
g. Through S1 to convenience outlets 2 and 1.
h. To F1-2 and F1-1 and out the black wire.
When troubleshooting the Variac (A1), take extreme care to avoid accidental
shorting of A1-1, A1-2 or A1-3. To test for an open A1, the unit must be de-
energized (turned off), the power cord removed from the grounded wall outlet,
and the primary side of A1 isolated from the circuit. Then and only then can
an ohmmeter be used to test for continuity in A1.
TROUBLESHOOTING TEST POINTS
You have learned the high-volume suction pump's circuits, now the lesson will
discuss troubleshooting procedures on the system's electrical circuits. Troubleshooting
the electrical circuit consists of testing for continuity between various points in the
circuit. Test continuity between the following circuit points or terminations.
a. With the reference at convenience outlets 3 and 4, test at the following points:
Convenience outlets 1 and 2.
Pilot light 1.
M1-1 and the armature brush.
b. With the reference at F1-2, test at the following points:
Convenience outlets 3 and 4.
Tie point A.
Pilot light 2.