psi
bar
MPa
31102020
Control Board Diagnostics
Digital Display Messages
Relieve pressure before repair; page 7. No display does not mean that sprayer is not pressurized.
DISPLAY
SPRAYER
OPERATION
INDICATION ACTION
No Display Sprayer may be pressurized. Loss of power or display
not connected
Check power source. Relieve
pressure before repair or disas-
sembly. Verify display is con-
nected.
Sprayer may be pressurized. Pressure less than
200 psi (14 bar, 1.4
MPa)
Increase pressure as needed
Sprayer is pressurized. Power is ap-
plied. (Pressure varies with tip size
and pressure control setting.)
Normal operation Spray
Sprayer stops. Engine is running. Exceeded pressure limit Remove any filter clogs or flow
obstructions. Make sure gun trig-
ger is locked open if using Auto-
Clean valve.
Sprayer stops. Engine is running. Pressure transducer
faulty, bad connection or
broken wire.
Check transducer connections
and wire. Replace transducer or
control board, if necessary.
Sprayer stops. Engine is running. High clutch current 1. Check clutch 7--pin bulkhead
connector. Clean contacts.
2. Measure 1.2 ±0.2Ω
(LineLazer IV 3900/R300);
1.7 ±0.2Ω (LineLazer IV
5900) across clutch field at
70_F
3. Replace clutch field assembly
After a fault, fo llow these steps to restart sprayer:
1. Correct fault condition
2. Turn sprayer OFF
3. Turn sprayer ON
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