Maintenance; Troubleshooting; Cable Continuity Test - Ransburg MICROPAK A11789 Service Manual

MicroPak Controller - Maintenance

MAINTENANCE

MAINTENANCE
MAINTENANCE
MAINTENANCE MAINTENANCE

TROUBLESHOOTING

TROUBLESHOOTING
TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING
Following are some areas to investigate when
high voltage faults occur:
• Dirty atomizer interior or exterior.
• Conductive solvent residue on atomizer
assembly.
• Moisture inside or outside of atomizer
body, causing continuity or partial continuity
back to ground.
• Moisture inside or outside of air lines back to
ground (high humidity).
• Loose connections or defective low voltage
cable.
• Loose or defective ground connections.
• Dump lines not clean or dry leading back to
ground.
• Target not grounded and causing arcing to
ground.
CABLE CONTINUITY CABLE CONTINUITY
CABLE CONTINUITY CABLE CONTINUITY CABLE CONTINUITY
TEST TEST TEST
TEST TEST
When problems arise, the Cable Continuity Test
can be performed to help determine whether the
problem is with the MicroPak controller or the
cable and/or cascade assembly.
1 9 1 9 1 9 1 9 1 9
W A R N I N G W A R N I N G
W A R N I N G W A R N I N G W A R N I N G
! ! ! ! !
Because this test involves access to
>
the interior of the MicroPak controller,
where hazardous voltages may be
present, it should only be performed by
qualified electronics technicians.
To conduct the test, perform the following:
1. Ensure that the controller is disconnected from
the AC source.
2. Using a screwdriver, pry open the 6 screw
covers on the top panel of the controller, remove
the screws, and remove the top panel (see Figure
9).
3. Disconnect connector J3 (see Figure 9) from
the rear of the problem MicroPak unit (1 or 2).
Leave the other end of the Low Voltage Cable
connected to the spray gun.
4. Using an ohmmeter, measure the resistance
values between the wires of MicroPak connector
J3. The readings should be as shown in Table 2.
If any of the readings are significantly outside the
values listed in Table 2, the low voltage cable
and/or cascade should be checked for the cause
of the problem. Otherwise, the cause of the
problem is most likely the controller.
5. Reconnect connector J3 and reattach the
cover panel to the controller.
CP-06-01