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Troubleshooting 4-92
NovaJet 800 Series Service Manual
Figure 4-98. Probable Defective Carriage PWA.
13. For inconsistent color output (color changes randomly or changes
slowly down the print within the same color space), color print
failures in all colors or prints, or no color print output then replace
the appropriate carriage assembly (defective gate array I/C or
driver I/C most likely). Ensure the 1x4 right and 1x4 left cartridge
sets are utilized for isolating the defective carriage PWA. If
problem shows up in both modes then the Main PWA or firmware
is at fault. Both examples above are extremely rare.
NOTE: Do not replace electronic assemblies for microbanding
symptoms. Normally the printer calibrations, select print mode, or
cartridge failure causes 97% of the symptoms observed.
Figure 4-99. Defective Main PWA.
14. For specific test or calibration functions that fail to print or execute
replace the Main PWA. Caution: do not use magnetic tipped
screwdrivers around circuit assemblies as this is known to have
caused Main PWA failures in the equipment. Refer to ‘Main PWA’
removal procedures in DISASSEMBLY.