Brother GTX-4 - 9-2. Solutions to Print Quality Problems; Print is Too Light; Horizontal Stripe (Banding) is Found on Printed Material

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Troubleshooting
9-2. Solutions to print quality problems
With reference to the descriptions below, troubleshoot your problem.
Print is too light
Probable Cause Remedy
Is the setting of an image editing software
application made improperly, or is an image placed
in CMYK mode?
With reference to "5-4. Creating print data from other applications
>>P.84", edit the image.
Have the printing conditions been applied
improperly, or does your image data have
insufficient color saturation?
With reference to "5-3-9. For Graphix Lab: Color Processing
>>P.82" or "5-5-8. For other applications: Color Processing
>>P.116", adjust saturation or contrast on [Color Processing].
Is a sufficient amount of ink left in a cartridge? With reference to "7-1-1. Replacement of ink pouch with a new
one >>P.173", replace the applicable ink pouch with a new one.
Is there any nozzle that does not eject ink-jet
droplets?
Press
on the operation panel, or perform the head cleaning
by selecting [Head Cleaning] from the menu.
If this problem is still not remedied, follow the instructions of
"9-2-1. Recovery action to be taken for such a nozzle that is
unable to eject ink-jet droplets >>P.245".
Is V-rating settings configured? With reference to "7-4-2. V-rating setting >>P.215", configure the
V-rating settings.
Isn't the [Low Temperature Mode] set to [Disable]? With reference to "8-5. Print Operation Settings Under Low
Temperature >>P.227", change the setting to [Enable(Normal)].
Horizontal stripe (banding) is found on printed material
Probable Cause Remedy
Is there any nozzle that does not eject ink-jet
droplets?
Press
on the operation panel, or perform the head cleaning
by selecting [Head Cleaning] from the menu.
If this problem is still not remedied, follow the instructions of
"9-2-1. Recovery action to be taken for such a nozzle that is
unable to eject ink-jet droplets >>P.245".
Do you print ink dots on a highly water-absorbing
print medium?
With reference to "8-1. Setting the print direction >>P.224", set the
print head's print direction to [Always Uni-Directional].
Also, with reference to "5-3-6. For Graphix Lab: Color multiple
pass printing >>P.77" or "5-5-5. For other applications: Color
multiple pass printing >>P.112", combine the color multiple pass
printing with the printing.
Is the platen positioned at too low level? With reference to "6-5. Placing print medium in position >>P.152",
adjust the height of the platen corresponding to the print medium
before using it. You can use the platen height adjustment lever to
adjust the height of platen. As a rough indication, adjust the height
so that it is lowered by one step from the limit height detected by
the obstacle sensor, and check that the platen is not detected by
the sensor.
Is the firing timing well-timed? With reference to "7-4-3. Firing adjustment >>P.216", make the
firing adjustment again. It is likely that the setup value is
incorrectly set after replacing a print head or the platen with a new
one, or after adjusting the platen height.