Ransburg MicroPak Controller A11789 - Manual (Page 22)

TROUBLESHOOTING
Following are some areas to investigate when
high voltage faults occur:
• Dirty atomizer interior or exterior.
• Conductive solvent residue on atomizer as-
sembly.
• 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
TEST
When problems arise, the Cable Continuity Test
can be performed to help determine whether the
problem is with the MicroPak controller or the ca-
ble and/or cascade assembly.
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 Fig-
ure 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 ca-
ble 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 cov-
er panel to the controller.
>
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.
W A R N I N G
!
MAINTENANCE
MicroPak Controller - Maintenance
20
Ransburg
CP-06-01.1