Lexmark J110 Service Manual - Page 126

4085-001 After capping, this test automatically exits. Carrier System Test This test determines if the carrier system sensor is working correctly. To run the test, select Carrier System Test from the SUBSYSTEM TESTS menu. The following screen is displayed: Carrier System Test Position = 1050 Once the test is initiated, the printhheads are uncapped and the carrier attempts an "open-loop" safe move to the middle of the printer without use of any feedback signals from the encoder strip. The goal is to first isolate a problem with the motor or drive. If there is no motion, then the problem is with the DC motor or motor driver, and not the encoder / feedback system. If there is no problem with the motor drive, then the carrier is somewhere out in the middle. If there is a problem, then the servicer can still drag the carrier out to the middle, since the printheads are uncapped. After the engine has finished the open-loop move attempt, no further attempts are made to drive the carrier using the motor and the carrier position begins updating real time on the panel. The servicer can now move the carrier back and forth over the entire carrier shaft. The servicer should move the carrier back and forth at a constant speed to determine if there are any noticeable skips or lags in positional count. A skip or lag in the far left or right regions could indicate a cable connection problem or strip contamination. Typical symptoms include shifting margins on previously printed pages. The encoder strip should be inspected with a light for signs of excessive mist, shaft grease, and fingerprints. It is preferable to replace the strip if it is contaminated. However, the strip can be wiped carefully with a deionized, water moistened lint-free cloth if a replacement strip is unavailable. A check should be made to ensure that the strip is clean and is not loose when installed or re-installed. The operator panel displays real time information that corresponds to the relative position of the carrier as it is moved back and forth. At the completion of testing, the servicer should manually move the carrier back to the right frame before exiting the test by selecting Return or Stop. This moves the maintenance station to the cap position to cap the printheads. 3-32 Service Manual