Technical Bulletin
tib 1006-001
RJ-900 Print Head Alignment
OVERVIEW
As with all printers produced by Mutoh, the head alignment steps on the RJ-900 and RJ-901 are quite
straightforward. These steps are common across the entire Mutoh product line although different names
may be used for each function from time to time.
This bulletin includes the relevant pages from the Mutoh service manual, along with corrections for
instructions that may be inaccurate or out of date.
MATERIALS NEEDED
•
#2 Philips screwdriver - for removing cover screws
•
5x or greater power loupe
•
Flashlight - a single LED unit such as a Mini Maglite is preferable due to its brightness. Also, a
blue LED light may help illuminate the yellow alignment patterns, which can be very difficult to
see under normal lighting conditions.
•
At least 10 to 15 feet of available paper for printing the alignment patterns.
PROCEDURE
1. Start the printer in Self Diagnostic Mode by holding down the UP, DOWN, and RIGHT arrow keys during
initialization. Release the keys when the printer displays Check: Test.
2. Press the RIGHT arrow key to display Check: Adjustment. Make sure that you have paper loaded and
the lever is down before you press ENTER.
3. Using the menu tree shown on the following page as a guide, go through the steps in this order:
a)
Nozzle check. This step is to ensure that the head is firing properly.
b)
Slant check 1. In this step, you will compare the first (black) and last (yellow) channels to
determine if the head is slanted. This can be adjusted through a lever on the side of the
head carriage.
c)
Slant check 2. This pattern determines whether there is a vertical adjustment (slant) to
the print head. This step is generally not necessary unless the head carriage has been
replaced or reinstalled.
d)
Uni-directional alignment. This adjusts the electronic timing of each of the 8 channels on
the print head to each print mode (the print mode is a combination of head height and car-
riage speed).
e)
Bi-directional alignment. This is a single adjustment that compensates for the alternating
directions of carriage travel when printing bi-directionally. One adjustment must be made
for each print mode.
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