Datasheet

Troubleshooting
Print Quality Problems
980006-001 Rev. A Zebra P630i & P640i Card Printer Service Manual 117
Faint, non-uniform image
• Printhead pressure too low. Adjust downward; see ‘Printhead Position (Height/
Pressure) Adjustment’ on page 133.
• Printhead not pivoting freely.
Gaps in image at edges and corners
• Possible de-lamination/wear of Platen’s rubber surface. Try cleaning Platen. If
unsuccessful, replace Platen; see ‘Platen’ on page 177.
• Possible non-uniformity of card thickness, or card surface defects.
Continuous white or black stripes on card’s longer dimension
• Before doing anything else, clean the printing edge of the printhead; see Section 6.2.
• White stripe means blown pixel (non-functioning heating element). One or two blown
pixels in isolation may be acceptable to some. Otherwise replace printhead; see
‘Printhead Assembly’ on page 192.
• Black stripe means non-functioning circuit(s) on printhead. If so, replace printhead;
but first check that it is not the result of an image size change not followed by power
cycling the printer.
Poor color registration
• Minor mis-registration of Y, M, and C color passes may be due to printhead angle
adjust screw not in firm contact with printhead frame; ‘Printhead Angle Adjustment’
on page 134.
• For gross mis-registration of Y, M, and C, suspect that the card not firmly positioned
against left hand pick edge of Truck on one or more passes. Spring at left end of
Platen may be missing or bound up. To remove the Platen, see ‘Platen’ on page 177.
• Check printed card for damage on corners or edges. Example: the card may be
scraping along the underside of the hopper base molding.
• Printhead pressure too light; see ‘Printhead Position (Height/Pressure) Adjustment’
on page 133.
• Printhead may be running hot. Will occur if head resistance incorrectly entered in
driver software; see ‘Printhead Adjustments’ on page 132.
• Toothed transport belt pulley may be slipping on drive shaft.
• Check platen spring -- spring height should be the same as the pin height; see ‘Platen’
on page 177.