Datamax DMX E E-4204 Operator's Manual page 61

Skips every other label
(Print quality is good, but every other label is skipped).
The label is formatted too close to the top edge of the label:
Leave white space equal to 8-dot rows (about .02 inch
[.5mm]) at the top of the label.
The media is not calibrated: Calibrate it (see Chapter 4).
If equipped, the Adjustable Media Sensor may need to be
repositioned (see Chapter 3).
The media sensor or media sensor circuitry may be
defective: Call for service.
Unable to print in rotation 4
The characters are formatted outside the dimensions of the
label: Check that the row/column values provide enough
room for the height of the image being printed.
Prints light on the right side of the label
The media width adjustment is set for a narrower media
width than is actually being used: Adjust for the media width
(see Chapter 5).
The printhead is not properly aligned: Call for service.
The printhead carrier assembly is not latched down: Latch it.
Printer fails to power on
The AC wall outlet may be faulty: Try another outlet.
A fuse may be blown: Call for service.
The power supply may be faulty: Replace it.
A defective power switch may exist on the printer: Call for
service.
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