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54 User Manual
Troubleshooting
- Make use of the Diagnostics options to check and record the jet monitoring parameters of Pressure,
Velocity Of Drop, Modulation and Phase. Compare these with the reference values and identify
any out-of-specification measurements. (See “Diagnostics”)
- Make print samples (if possible) and examine the prints carefully for signs of print quality problems.
- Only when all of the symptoms have been noted should an attempt be made to identify the possible
cause of the problem.
Identifying Faults
Some faults are best identified by the appearance of the print when a sample of the test pattern is
printed. Other faults may not permit a print to be made, or may produce other symptoms such as fault
messages. To accommodate these differences, this sub-section is divided into two parts: “dentifying
Faults by Print Sample” and “Identifying Faults by Symptom”.
Identifying Faults by Print Sample
This part of the manual is intended to help distinguish between different types of print fault, in order to
identify the possible causes.
There are several ways in which print quality can be affected, and in some cases print quality problems
can be caused by more than one fault. For most faults, it is not difficult to identify the cause of the
problem, but some faults have similar symptoms, making accurate diagnosis a little more difficult. For
example, a low modulation problem can give similar symptoms to high viscosity.
In cases where the cause of the print fault is not immediately obvious from the print sample, secondary
symptoms should always be sought that will help to distinguish between the possible causes. In the
example above, the current modulation would need to be checked, and the pressure, the Velocity Of
Drop, and the operation of the ink system components investigated. These additional pieces of
information will then enable you to decide which of the possible causes is the reason for the print fault.
The following list classifies faults by the appearance of the print samples they produce. The list shows
print samples of the standard test pattern which can be compared with samples taken from the printer
under investigation. Below each sample, or set of samples, is a brief description of the fault symptoms.
Also provided are the possible causes of the fault and a reference to a particular fault code number in
the “Problem Solving - Print Samples” part, where the problem and its method of rectification is
described in more detail.
NOTE: Throughout this manual, reference to the “top” of the print means the part of the pattern
closest to the negative deflector plate of the printhead (i.e. the least deflected drop).
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