Troubleshooting
Problem Problem
ProblemCause Cause
CauseSolution Solution
Solution
Thepneumaticblastcontrolcircuit
ismalfunctioning.
SeePneumaticBlastControlCircuit,
page27.
Themainairregulatorisstuck
open.
SeeRepairingtheMainAirRegulator,
page28(EQ600–Kit17C131,EQ300
–Kit17C129).
Theblastcontroltubingisnot
connectedproperly.
Ensureairtubingisroutedandconnected
properly.SeeHoseSchematic,page39.
Electricblastcontrolcircuitis
malfunctioning.
Inspecthosecablefordamagedor
shortedwiring.Checkbatteryandcontrol
panelconnections.EnsureDCpower
sourceis12V.Check3Afuseinside
controlpanelandreplaceitifnecessary.
Checkcurrentowincircuit,ifcurrent
exists,replacerelay(EQ5179).
Theblastcontrolisnot
engagedbutblastingstill
occurs.
Pneumaticblastcontrolcircuitis
malfunctioning.
SeePneumaticBlastControlCircuit,
page27.
Incorrectabrasiveisbeingused.Usethecorrectabrasive.See
MeteringValveSettings,page16.
Thepotdoesnothaveasufcient
amountofabrasive.
Rellthepotwithabrasive.See
RellingthePotwithAbrasive,page18.
Thepotpressuresettingis
incorrect.
Performthepressurereliefprocedure
(seePressureReliefProcedure,page8)
andresetpotpressure(see
SettingUptheEquipment,page11).
TheAuto-Ventvalvedoesnotvent
airwhenthepotislled.
MakesuretheAuto-Ventvalve
isworking.PerformtheAuto-
Ventcleaningprocedure(see
CleaningtheAuto-VentValve,page31).
Thediaphragmvalveis
malfunctioning.
Performthediaphragm
ushprocedure(see
FlushingtheDiaphragmValve,page29).
Ifushingdoesnotsolveproblem,see
RepairingtheDiaphragmValve,page30.
Theblastspraypatternis
irregular.
Thereisblockageinsidethepotor
insidetheabrasivehosebetween
thepotandthepanel.
Makesuretheballvalveisclosed,then
disconnectthecam-lockcoupler.Open
theabrasiveballvalveslightlyandmake
sureabrasiveisowingformtheabrasive
hose.Ifnot,followtheshutdown
procedure(seeShuttingDown,page19).
Thoroughlyushthepotandthemedia
hoseafterdrainingmediaandwater.
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