E073 - Cr Origin Error; E074 - Cover Sensor Error; E076 - Pg Origin Err - MUTOH Rockhopper 3 Troubleshooting Manual

2.4.5 E073 - CR Origin Error

The origin sensor of the printer Carriage cannot be detected.
Step 1 : Verify the U-pot sensor on top of the Y-rail Check if the U-photo sensor is properly aligned and
the carriage-flag activates it. The U-sensor can be tested by putting some non-transparent
material inside to activate.
Diagnostics
Step 2 : Verify cable connections on sensor and mainboard
Step 3 : If sensor is not responding, replace sensor + verify, eventually replace cabling
Step 4 : If still no response after sensor replacement, the mainboard might be defect (replace mainboard)

2.4.6 E074 - Cover Sensor Error

Step 1 : Verify all cover sensors as described in error E068.
Step 2 : Verify cover sensors in Diagnostics
Step 3 : Verify if the front cover is closing all the switches properly
Step 4 : Verify sensor cable connections, try to bypass sensors by short-circuiting pins 1 and 2
Step 5 : If still not ok, replace mainboard + cover switches

2.4.7 E076 - PG Origin Err

Step 1 : Verify if the optical sensor is working by putting something a piece of material before it. The
sensor can be tested via:
Diagnostic
Step 2 : The optical headheight home-sensor (HD_SLIDE) can not be detected.
Apply some non-reflective and non-transparent black tape on the right carriage headheight
adjustment-bracket. This will improve the performance of the optical sensor (which only detects
black/white transitions) to detect the hole in the adjustment-wheel of the headheight assembly.
Step 3 : Verify the headheight homing sensor and the Up-Down motor via:
Diagnostics
Step 4 : If the motor is not running, replace the motor
Step 5 : If still not ok, verify cable connections.
Step 6 : If all previous steps did not help you any further and a replacement sensor also doesn't give any
response, only then replace the mainboard.
Test Sensor CR Home position
sensor HD_SLIDE sensor
Life Head U/D
Test Sensor Cover switches
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Troubleshooting
AP-74700 – Rev. 1.0 – 10/03/2008