J640 Operator's Handbook
3.In a holder mounted on the back side of the printer, there should be a cleaning pen. Using this cleaning pen or a cotton swab moistened with alcohol, rub back and forth across the printhead, platen roller, peel bar, pinch rollers, and peel blade to remove any build up. Make sure the printhead, platen roller, peel bar, pinch rollers, peel blade, and tear bar are clean.
Tear Bar
Peel Blade
Printhead
Platen Roller
Pinch Roller