Graco ULTRA 1000 Instructions-Parts List Manual page 20

Remove the bridge from the pressure control box and
perform this test to determine
if
the bridge is functional.
See Bridge Rectifier Replacement, page 24. Use a
continuity tester, such as multi-meter set on the
X1
ohms scale
(
1 2
I.
Eight individual checks, or tests, must be performed. If
the bridge fails even one test, itmust be replaced.
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
6,
connect the
+
and
-
mater wires as
indicated, check continuity, then switch the meter wire
connections and check continuity again. You should
get NO continuity one way, and YES continuity the
other way.
by the black dots. Touch the indicated "G" wire to one
In Tests 7 and 8, connect the meter wires as indicated
meter wire, and then to the other. You should get NO
continuity one way, and YES continuity the other way.
BRIDGE WIRES
TEST 1
TEST 4
TEST 5
TEST 6
TEST 7
TEST 8
Fig
'
12
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