Bridge Test - Graco A Series Instructions-Parts List Manual

BRIDGE TEST
perform this test to determine if the bridge is functional.
Remove the bridge from the pressure control box and
See Bridge Rectlfier Replacement, page 24. Use a
continuity tester, such as multi-meter set on the X1
ohms scale
( 0
1.
the bridge fails even one.test, it must be replaced.
Eight individual checks, or tests, must be performed. If
Fig 12 shows the position of the wires on the bridge. Us-
ing the chart at the right, connect the meter wires as in-
dicated by the black dots for each test, then check the
continuity.
In Tests 1, 2 and
3,
there should be NO continuity.
In Tests 4,5 and 8, connect the
+
and
-
meter wires as
indicated, check continuity, then switch the meter wire
get NO continuity one way, and YES continuity the
connections and check continuity again. You should
other way.
In Tests 7 and 8. connect the meter wires as indicated
by the black dots. Touch the indicated "G" wire to one
meter wire, and then to the other. You should get NO
continuity one way, and YES continuity the other way.
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