3–28 Troubleshooting
Ribbon
Hammer bank cover
MPU sensor
Hammer spring
Hammer coil (shuttle frame assembly)
• All Underlines An underline pattern useful for identifying
hammer bank misalignment.
Mechanism Driver PCBA
Hammer bank cover
Hammer tips
Paper feed belt or motor
Splined shaft bearings
Tractor bearings or belts
• All Black All dot positions are printed, creating a solid black band.
Exercises shuttle and hammer bank at maximum capacity.
Mechanism Driver PCBA
Power Supply PCBA
Hammer bank cover
Hammer spring
Hammer coil (shuttle frame assembly)
• Shuttle Slow Verifies proper operation by exercising shuttle
motion at low speed.
• Shuttle Fast Verifies proper operation by exercising shuttle
motion at high speed.
• Phasing A hammer timing parameter that permits you to adjust
the vertical alignment of dots in character printing. (See page 4–6.)
• Test Width Permits you to run tests at all available print widths.
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