Abnormal Printing - AMT Datasouth Accel-7350 Service Manual

Abnormal printing

Dot is missing in horizontal direction.
Possible cause: A pin in the printhead is defective. Main PCB is defective.
Remedy: Replace the print head if a print pin is bent or broken and if 14 Ω of resistance
between GND and each pin is not measured on the print head terminal.
Replace the defective components on the Main PCB, such as the driving
transistor or fuse for missing pin.
Vertical dot spacing is improper.
Possible cause: Print head is defective.
Paper holding pressure by tractor R/L is insufficient.
Remedy: Replace the print head or the tractor spring.
Dot alignment in horizontal direction is improper.
Possible cause: C motor is defective.
Remedy: Replace the C motor.
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