MUTOH RJ-900 User Manual

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instructions that may be inaccurate or out of date.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difcult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ringproperly.
b) Slantcheck1.Inthisstep,youwillcomparetherst(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.
Call Us: a (408) 394-7595 • www.inkjetbiz.com
SUPPORT
INKJETBIZ

MUTOH RJ-900 Specifications

General

Type	Large Format Inkjet Printer
Print Resolution	1440 x 1440 dpi
Number of Colors	4 (CMYK)
Operating System Compatibility	Windows
Media Types	Vinyl, canvas
Connectivity	USB, Ethernet
Power Requirements	100-240 V, 50/60 Hz
Technology	Piezoelectric Inkjet

Summary

Overview of RJ-900 Print Head Alignment

Procedure for RJ-900 Print Head Alignment

Nozzle Check Procedure

Ensures the print head is firing properly by checking nozzle discharge.

Slant Check 1 Procedure

Checks for print head slant in the horizontal direction using black and yellow channels.

Slant Check 2 Procedure

Checks for print head slant in the vertical direction, usually after head carriage replacement.

Uni-directional Alignment Procedure

Adjusts electronic timing for each of the 8 channels during uni-directional printing.

Bi-directional Alignment Procedure

Compensates for carriage travel direction changes in bi-directional printing.

Adjustment Menu Overview

Head Nozzle Check Menu

Confirms ink firing from nozzles after ink charge using various patterns.

CW Adjustment Menu

Adjusts print position gaps caused by CR passes using Uni-D printing.

Repeatability Adjustment Menu

Aligns head positions for repeatable printing by comparing CW and CCW print positions.

Head Alignment Adjustment (Horizontal Height)

Head Alignment Adjustment (Slant)