Graco Magnum DX 232735 Service Instructions Manual page 12

SPECIFIC PROBLEM
Building circuit breaker opens
as soon as sprayer is turned on.
Building circuit breaker opens
as soon as sprayer is plugged
into outlet, and sprayer is NOT
turned on.
NOTE: Remove right
enclosure mounting screws,
and pull right enclosure away
from drive housing. Take care g
to not pull on the leads from t t ll th l d f
the electrical cord and the
Power switch (B).
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Advanced Troubleshooting
General Problem: Circuit Breaker is Tripping
CAUSE
Sprayer electrical wiring is pinched, or insulation
is damaged.
Wires between pressure control switch and
control board are pinched.
Motor armature is shorting.
Control board is damaged.
CAUTION: Do not perform control board
diagnostics until you have determined that the
armature is good. A bad motor armature can burn
out a good control board.
Sprayer electrical cord is damaged.
Sprayer Power switch (B) is damaged.
See also "Basic Electrical Problems" on page 10 and "Sprayer Wiring Problems" on page 11.
SOLUTION
Repair or replace any damaged wiring or
terminals. Securely reconnect all wires.
Check for shorts using armature tester
(growler), or perform spin test (see Motor
Diagnostics on page 19). If shorts are
evident, replace motor using Motor Kit
245080 for DX models or 243236 for XR
models.
See Control Board Diagnostics on page
19, and replace control board if damaged
using Control Board Kit 245079 for DX
models, 243228 for XR5 and XR7 models, or
243229 for XR9 models.
Unplug sprayer electrical cord. Disconnect
black electrical cord wire at Power switch (B),
and unplug in-line connection of white
electrical cord wire. Plug in electrical cord,
and test voltage between black and white
electrical cord wires. Meter must read
85 to130V AC.
Replace electrical cord if no voltage.
Unplug sprayer electrical cord, and
disconnect wires from Power switch (B).
Check resistance of switch with ohmmeter.
Reading must be infinity with Power switch
OFF, and zero with Power switch ON.
Replace Power switch if damaged.