BestCode NExT 88SHS - Page 224

BestCode Next Series 8 Technical Manual October 2022 Page 210 of 290
Phase Troubleshooting
The phasing of the Next Series 8 is necessarily sensitive, as it controls much of the print accuracy. Therefore, it is possible
for a number of issues to cause a Phase Fault. Aside from the normal Phase Fault resolutions listed in the Prompt
Resolution Guide, below are listed common causes and solutions.
Cause
Reason
Solution
Printer is poorly
configured
The printer is set up is such a way that the Service
settings are causing Phase Faults to occur. This
can include Pressure, Modulation, Charge, Print
height, and even message setup.
Install Newest Firmware (01.05.01.19+)
Reset machine to default settings
Calibrate the Modulation
Flow is low at the
nozzle.
Can be caused by restriction on the Ink inlet path
for the drop generator or a leaky bleed valve.
Both reduce the jet velocity and disrupt the ability
to phase drops properly.
Check the Jet Speed
Check the Nozzle Flow
Check the Bleed Flow
Erratic RPS causing
pressure fluctuation
Air being drawn into the pump causes cavitation
and varying pressure in the system. Will disturb
jet velocity and cause phasing issues.
Check for Loose Connections on the pump
circuit.
Partially Clogged
nozzle
Small nozzle clog is enough to change the droplet
shape but not move the jet out of the gutter. The
strange drop shape will cause issues with
collecting phase data.
Backflush the Nozzle
Replace the Nozzle
Ink Viscosity
Thick or thin ink can cause poor modulation.
Viscosity should be between 3.0 – 6.0 cP for inks
targeted at 4.5 cP, and 1.8 – 3.8 cP for inks set at
2.8 cP.
Check ink viscosity
Review Viscometer troubleshooting
Electrical Issues
Poor grounding of the machine is a prime
electrical culprit when looking for non-fluidic
causes of Phase issues.
Review the system grounding information.
Printhead Connectors
Check the connections to the circuit board.
Printhead Signal – J27 and Charge Yellow -J33 are
directly related to phase.
Follow Safety instructions for Servicing the
printer.
Clean connections with Isopropyl alcohol
and dry thoroughly before reconnecting.
No Breakup (No drops)
Ink droplets must be formed for the phase to be
measured. Issue could be related to CPU 300V
circuitry, cabling, or Drop Generator
Clean J34 Modulation with Isopropyl alcohol
and dry thoroughly before reconnecting.
Replace Coax Cable
Replace Drop Generator