Specifications

3–27Troubleshooting
• Es plus TOF A pattern of all Es followed by a form feed to the
next page top of form, useful for identifying paper motion or feeding
problems.
Hammer bank cover
Power supply PCBA
Mechanism Driver PCBA
Paper motion sensor or cable
Paper feed belt or motor
Splined shaft bearings
Tractors or tractor belts
• All Hs A pattern of all uppercase letter Hs useful for detecting
missing characters or dots, smeared characters, or improper phasing.
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.