Control Board Diagnostics - Graco Magnum LTS 15 Repair Manual

Control Board Diagnostics

ProLTS 19
NOTE: Check for motor problems before replacing con-
trol board. A damaged motor may burn out a good con-
trol board.
Check for a damaged control board or pressure control
switch as follows:
1. Relieve Pressure (see Pressure Relief Proce-
dure, page 13).
2. Unplug electrical cord.
3. Remove four cover screws and front cover.
Remove motor enclosure.
4. Remove yoke and guide rods.
5. Remove gear.
6. Remove pressure control harness from control
board. Using tip of small, flat blade screwdriver,
press tab on right side connector to release.
7. Attach harness from a pressure control switch you
know is functioning correctly to control board.
NOTE: Pressure control switch does not have to be
installed in pump.
8. Turn pressure control adjustment knob (C) +to max-
imum pressure setting.
9. Plug electrical cord into 240 VAC receptacle.
10. Turn power switch (B) ON.
• If motor runs, replace failed pressure switch.
Pressure Control Switch Kit. See List of Kits,
page 30.
• If motor does not run, replace control board
repeat test. Control Board Kit. See List of
Kits, page 30.
332695C
LTS 15 and LTS 17
NOTE: Check for motor problems before replacing con-
trol board. A damaged motor may burn out a good con-
trol board.
1. Unplug electrical cord and relieve pressure (see
Pressure Relief Procedure, page 13).
2. Remove enclosure and check all control board
connectors for proper installation (see Wiring
Diagram, page 44).
3. Check fuse on control board. If fuse is blown,
determine the cause before replacing control board
(see Advanced Troubleshooting, page 20).
Control Board Diagnostics
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