Canon MX700 - Troubleshooting by Symptom

2-6. Troubleshooting by Symptom
Symptom Solution
Faulty operation The power does not turn on.
The power turns off immediately after
power-on.
- Confirm the connection of
- the power cord, and
- between the logic board and the power supply unit.
- Replace the
- power supply unit, or
- logic board.
A strange noise occurs. - Remove foreign material.
- Attach a removed part if any.
- Check the operation of the moving parts (such as purge
unit, carriage unit, and paper feeding mechanism)
- Replace a faulty part, if any.
Nothing is displayed on the LCD. - Confirm the connection between the operation panel, the
LCD unit, and the logic board.
- Replace the
- LCD unit, or
- logic board.
A portion of the LCD is not displayed. - Perform the button and LCD test in the service mode, and
confirm that the LCD is displayed without any segments
missing or flickering.
- Confirm the connection between the operation panel, the
LCD unit, and the logic board.
- Replace the
- LCD unit, or
- logic board.
Paper feed problems (multi-feeding,
skewed feeding, no feeding).
- Examine the inside to confirm that no parts are damaged,
and the rollers are clean.
- Remove foreign material.
- Adjust the paper guide properly.
- Set the paper properly.
- Confirm the following:
- selected paper source
- attachment of the rear cover (for feeding from the front
tray)
- connection of each harness and the logic board
- Replace the
- sheet feeder unit,
- ASF cover unit,
- bottom case unit (for paper feeding from the front
tray), or
- logic board.
Carriage movement problems (contact
to other parts, strange noise).
- Confirm that the carriage timing slit strip film is free from
damage or grease.
- Clean the carriage timing slit strip film (with ethanol and
lint-free paper).
- Remove foreign material.
- Replace the
- carriage timing slit strip film, or
- carriage unit.
Faulty scanning (no scanning, strange
noise).
- Confirm the connection between the scanning unit and
the logic board.
- Replace the
- scanning unit, or
- logic board.
No paper feeding from the ADF (no - Confirm the connection
12 / 41