SOURCE: extra feed
The label sensors might not be getting a strong signal as the labels pass between them.
Make sure the labels are loaded all the way to the left (as viewed fron the front) and make sure the label guide (near the back of the printer) is set to keep the labels from wandering away from the sensor.
There is a pair of infrared emiter and detector located above and below the label path. As label pass between, these measure the leading and trailing edges of each label.
If you haven't already done so, calibrate the printer, by using the "Online", "Calibrate", "Online" buttons.
Hit the "Feed" button a few times to see if the labels feed consistantly. It might take to "Feeds" to get each out, if they stop at both the start of the printhead and again at the tear bar. Adjusting the labels and calibrating fixes most problems.
If the "Feed" button still doesn't feed just one label and the printer still skips labels, you'll need to adjust the label gap sensors. This can be a bit tricky if your labels are very narrow.
There should be a small pcb on a shaft under the label path. Note its current location, then slide it left or right to get a better signal, and try the feed button again. On my Zebras, the sensor is not in the middle of the PCB. Look for a small metal "can" on the PCB and center that.
The upper sensor is more difficult to adjust, but if you manage to spot a very small PCB above the labels, it will be easier to line these up.
SOURCE: ZQL420+ is printeing an extra blank label with each good label.
Check if you have " send Form Feed after each file" is enabled (or yes) in your print queue
SOURCE: TLP 2844 skips 15-16 labels then prints intended label
It sounds like they may need to set their "Q" values for the labels they are using. If that isn't it, we may need more info - are they using Zebra brand or custom labels?
To start with, I would ask them to try adding these "Q" value commands:
q456
Q152,24
If that doesn't work, then maybe they can provide the other info mentioned above so we can understand the problem better.
SOURCE: Not printing all labels
Do a calibration, this should fix the issue. Also make sure that the label stopper (silver peg on label holder) is pressed firmly against the labels. This will stop the labels from sliding around during a print, throwing off the calibration. Also check to make sure the sensors are free of any dust.
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