Graco MARK V, Repair Manual

Page: 12 / 40

Troubleshooting
12 3A2333B
Electrical
Symptom: Sprayer does not run, stops running, or will
not shut off.
Perform Pressure Relief Procedure ; page 9. Wait 5
minutes before servicing.
• Plug sprayer into correct voltage, grounded outlet
• Set power switch OFF for 30 seconds and then ON
again (this ensures sprayer is in normal run mode).
• Turn pressure control knob clockwise 1/2 turn
• View digital display
WARNING
If no digital display is available, use control
board status light to troubleshoot prob-
lems: Turn ON/OFF switch OFF, remove
control cover and then turn power back
ON. Observe status light. Blinking LED to-
tal count equals digital error code i.e., two
blinks equals E=02.
Keep clear of electrical and moving parts during trou-
bleshooting procedures. To avoid electrical shock haz-
ards when covers are removed for troubleshooting, wait
5 minutes after unplugging power cord for stored elec-
tricity to dissipate.
TYPE OF PROBLEM WHAT TO CHECK HOW TO CHECK
Sprayer does not run at all See flow chart, page 17.
Digital display is blank
Control board status light never
lights
Sprayer does not run at all
Check transducer or transducer
connections 1. Make sure there is no pressure in the system (see
Pressure Relief Procedure , page
9
). Check fluid
path for clogs, such as clogged filter.
2. Use airless paint spray hose with no metal braid
1/4 in. x 50 ft minimum. Smaller hose or metal braid
hose may result in high-pressure spikes.
3. Set sprayer to OFF and disconnect power to
sprayer.
4. Check transducer and connections to control board.
5. Disconnect transducer from control board socket.
Check that transducer and control board contacts
are clean and secure.
6. Reconnect transducer to control board socket.
Connect power, set sprayer ON and control knob
1/2 turn clockwise. If sprayer does not run properly,
set sprayer to OFF and go to next step.
7. Install new transducer. Connect power, set sprayer
ON and control knob 1/2 turn clockwise. Replace
control board if sprayer does not run properly.
Digital display shows E=02
Control board status light blinks
2 times repeatedly