The printhead alignment sounds to be out or the hopefully just dirty. on this printer the printhead is not autoaligning like on the smaller printer and you need to tune the tilt,rotation,position, and so on. not just the print pressure. there are about 4 sets of hex screws around the head mech that are used to adjusted the alignment. good luck
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1. If you are printing using postscript driver, try using PCL6 - printout would be darker for grey scaled items.
2. Print in lower resolution 600dpi or 300dpi, printouts would be darker.
3. Try printing all characters as black
You can adjust darkness at the printer using the console menu.
In the Configuration Menu ' Print Quality sub Menu , there is a parameter called Tonor Density. Factory Default is 3. Set to 4 or 5 to increase darkness..
Is this unit in thermal transfer or thermal direct mode? Depending upon the usage of this machine, perhaps a new thermal head is required. If thermal direct, try a different roll of labels, it is possible to get a bad batch. In thermal transfer mode, the tape could be bad as well. Try a new one to test.
The DARKNESS setting controls the amount of ink released to the label. The 105 has a range of 1-30, 1 is the lightest - 30 is the darkest. The setting used will depend on the combination of label / ribbon used. There is no "correct" number, always try to use the lowest setting with acceptable print quality.
The DARKNESS can be adjusted from the front panel by pressing SETUP and changing or DARKNESS can be controlled from the software or printer driver. The printer driver or software usually overrides the setting in the printer.
So the left side is blank ? Usually caused by an imbalance across the printhead. Check the toggle pressure on the left side. Each toggle has a dial on top for adjusting the down pressure. Probably less pressure on the left than the right. Quick test would be to use your finger to put some down pressure on the left side of the printhead while printing. If the print is there, you have your answer. If still no printing, then something else is happening.
You will know when the printhead is starting to wear out by seeing white vertical lines. The line is a "void" area caused by an element/elements that are worn away - no image is being produced. Darkness is usually controlled by the printer driver and/or the label software being used.
I think the 105 has an adjustment on the printhead. There are left and right hand adjusters just above the printhead. It sounds as if the right hand one does not have enough pressure on it, try increasing the RH one and see the effect on the print.
In your label software there should be a setting option for print darkness (I assume it adjusts the head temperature) In ours (bartender) you can get to it when you select 'print' and a window appears with a 'documents properties' button. Click on this and select options and a darkness bar appears which you can adjust. You may also need to slow the label print speed if the darkness adjustment is not enough. I suspect it isn't in the printers best interest to run the print head at maximum darkness/heat so a sensible balance of darkness and print speed is best.
Another, less likely, possibility is an incompatability between the label material or surface finish, and the ribbon type. We did have a problem once whem Homebase changed their price label design and we had to test a load of other ribbon types until we got one that did the job. A chat with the label or ribbon supplier is always usefull, they sent us several sample bits to test.