Pressure Control Repair
Motor Control Board Diagnostics
For these models and series only: 232900 A, B, C, D, E
232901 A, B, C, D
233797 A, B, C, D
233815 A, B, C, D
232903 A, B
232906 A, B
Note: Keep a new transducer on hand to use for test.
1.Remove four screws (18) and cover (39).
2.Turn ON/OFF switch ON.
3.Observe LED operation and reference following table:
4. | Relieve pressure and un- | |
plug sprayer before servic- | ||
| ||
| ing control board; page 6. |
CAUTION
Do not allow sprayer to develop fluid pressure with- out transducer installed. Leave drain valve open if test transducer is used.
LED | SPRAYER OPERATION | INDICATES |
BLINKS |
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Once | Sprayer runs | Normal operation |
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Once and | Sprayer shuts down and LED stays ON | Motor open circuit or bad |
stays ON |
| control board |
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Two times | Sprayer shuts down and LED continues | Run away pressure. Pres- |
repeatedly | to blink two times repeatedly | sure greater than 4500 psi |
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| (310 bar, 31 MPa). |
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Three times | Sprayer shuts down and LED continues | Pressure transducer is |
repeatedly | to blink three times repeatedly | faulty or missing |
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| |
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Four times | Sprayer shuts down and LED continues | Line voltage is too high |
repeatedly | to blink four times repeatedly |
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Five times | Sprayer shuts down and LED continues | Too much current |
repeatedly | to blink five times repeatedly |
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Six times | Sprayer shuts down and LED continues | Motor thermal switch |
repeatedly | to blink six times repeatedly | open circuit |
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WHAT TO DO
Do nothing
Check motor brushes and armature. If OK, replace mo- tor control board.
Replace motor control board. See following Motor Control Board procedure.
Check transducer connection. Open drain valve. Substitute new transducer for transducer in sprayer. If sprayer runs, replace transducer.
Check for voltage supply problems
Check for locked rotor, shorted wiring or motor. Re- pair or replace failed parts.
Check for binding in pump or drive. Check for bad motor.
