Printing Problems - Canon MP 700 Service Manual

4.3.2 Printing problems

• The paper is not feed properly. (Evaluation criteria: Look at the actual unit.)
The Paper feed motor does not run.
(1) Check the connection from the paper feed motor to the sensor board (JLF1).
(2) Replace the sensor board.
(3) Replace the paper feed motor. (In this case, you must replace the printer unit
(HM1-0453) which contains the paper feed motor.)
The paper is not picked up from the auto sheet feeder.
(1) Check the connection ASF motor to the sensor board (J7).
(2) Check the foreign matter in the paper feed section.
(3) Replace the ASF unit.
(4) Replace sensor board (Faulty PRS or PES).
• The printing operation is abnormal.
Nothing is printed.
(1) Remove the printhead and re-install it.
(2) Execute cleaning five times, and try printing again.
(3) Replace the printhead.
(4) Replace the ink tank.
(5) Check the connection between carriage ribbon cable and SPCNT board (J1, J2, J3).
(6) Replace the carriage unit.
(7) Replace the SPCNT board.
The carriage motor does not run.
(1) Check the connection from the carriage motor to the sensor board (JCRM1).
(2) Check the connection from the sensor board(JEXT1,JEXT2) to the SPCNT board
(JEXT1,JEXT2).
(3) Replace the carriage motor.
(4) Replace the sensor board.
(5) Replace the SPCNT board.
• Carriage error
The carriage comes into contact with the push-on plates at the left and right
sides, resulting in noise.
(1) Check if grease adheres to the carriage encoder film.
(2) Using lint-free paper impregnated with alcohol, wipe the carriage encoder film with care
so as not to scratch the film.
(3) If a lot of grease adheres to the carriage, replace the carriage board because grease might
be spread to the sensor on the carriage board. (In this case, you must replace the
carriage unit (HM1-0455) which contains the carriage board.)
(4) Replace the carriage encoder film.
MultiPASS MP730/MP700 Chapter 4: Maintenance and Service
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