Scanning Problems - Canon MP 700 Service Manual

4.3.3 Scanning problems

• Faulty scanning (Evaluation criteria: Test print is good, but the copied image
is no good.)
• The document is not fed.
The document feed motor does not run. (Evaluation criteria: Check it
visually.)
(1) Check the connection from the document feed motor to the ADF board (JFM).
(2) Check the connection from the ADF board and sensor board sub PCB (JADF3).
(3) Check the connection from the sensor board(JEXT1,JEXT2) and SPCNT board
(JEXT1,JEXT2).
(4) Replace the document feed motor.
(5) Replace the ADF board.
(6) Replace the sensor board.
(7) Replace the SPCNT board.
The document slips against the rollers. (Evaluation criteria: Check it visually.
Stretched copy image.)
(1) See this Chapter 2. HOW TO CLEAN PARTS and clean the document reading section.
(2) Replace the ADF section's rollers.
The document does not separate. (Evaluation criteria: Check it visually.)
(1) Check whether the document feed motor is driving all the rollers. (Check for any
damaged gears or foreign matter stuck inside.)
(2) See Chapter 2. HOW TO CLEAN PARTS and clean the separation roller and separation
guide.
(3) Replace the separation roller and separation guide.
Faulty scanner unit's sensors (Evaluation criteria: The placed document or
transported document is not detected.)
(1) Check for any faulty sensors while executing the copying operation and test mode.
(2) Check the connection from Document sensor and Document edge sensor to the ADF
board (JDS, JDES).
(3) Check the connection from the ADF board to the sensor board sub PCB (JADF3).
(4) Check the connection from the sensor board(JEXT1,JEXT2) and SPCNT board
(JEXT1,JEXT2).
(5) Replace the Document sensor.
(6) Replace the Document edge sensor.
(7) Replace the ADF board.
(8) Replace the sensor board.
(9) Replace the SPCNT board.
MultiPASS MP730/MP700 Chapter 4: Maintenance and Service
4-29